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Hitachi RASC-10HNPE Service Manual Download Page 196

10 Troubleshooting

Initial troubleshooting

SMGB0091 rev.2 - 11/2015

186

10.1  Initial troubleshooting

10.1.1  Checking using the 7-segment display

  



Simple checking procedure using the 7-segment display

1 

Turn on all the indoor units which are connected to the RASC unit.

2 

Turn on the RASC unit

3 

Auto-addressing starts. (RASC unit printed circuit board PCB 1). During the auto-addressing, you can check the 
following items using the 7-segment display of the RASC unit.

a. 

Disconnection of the power supply to the indoor unit.

b. 

Reverse connection of the operating line between the RASC unit and indoor units. In this case, “

03

” appears 

after 30 seconds.

c. 

Duplication of the indoor unit number. See alarm code 

35

.

Normal case

The 7-segment display of the RASC unit is not indicated.

Abnormal case

If there is something wrong, the 7-segment display of the RASC unit displays the following indications:

Cause

Indication

Remarks

The indoor units are not supplied with power.

03

Continues to flash after 30 seconds.

Disconnection of the operating line between the RASC units and the 

indoor units.

03

Continues to flash after 30 seconds.

Duplicated settings of the indoor unit number on the rotary switch 

RSW (Refer to the section 

“10.2.3 Troubleshooting by alarm code”

 for 

the description of the alarm code "

35

").

35

Summary of Contents for RASC-10HNPE

Page 1: ...CENTRIFUGAL VRF SERIES RASC HNPE RASC 4HNPE RASC 5HNPE RASC 6HNPE RASC 8HNPE RASC 10HNPE Service Manual ...

Page 2: ......

Page 3: ... 9 10 11 Contents General information Unit installation Piping work and refrigerant charge Electrical and control settings Control system Optional functions Commissioning Electrical checks of the main parts Servicing Troubleshooting Maintenance notes ...

Page 4: ......

Page 5: ... 2 1 Initial check 14 2 2 Transportation 15 2 2 1 Hanging method 15 2 2 2 Handling unit centre of gravity 16 2 3 Factory supplied components 16 2 4 Installation space 17 2 5 Interchangeability of air inlet and outlet panels 18 2 6 Installation place provision 24 2 7 Fan performance curves 25 2 8 Duct connection 27 3 Piping work and refrigerant charge 29 3 1 Piping work connection considerations 30...

Page 6: ... 52 3 6 Compatibility with the piping of current installations where R22 or R407C is used 54 3 6 1 Installation procedure for existing pipes 54 3 6 2 When the existing air conditioner is a product of another manufacturer 55 3 6 3 Permissible range for existing air conditioning pipes 55 3 6 4 Selection of the renewal kit model 55 3 7 Drainage and drain pipe installation 57 4 Electrical and control ...

Page 7: ... functions 89 5 4 1 Freezing protection during cooling process or dry operation 89 5 4 2 Prevention control for excessively high discharge gas temperature 90 5 4 3 Activation for protection device control 91 5 4 4 Preheating control of compressor 92 5 4 5 Prevention control for high pressure increase during cooling operation 92 6 Optional functions 93 6 1 Optional external input and output signals...

Page 8: ...pressure protection devices 138 8 4 2 Description of the pressure protection devices 138 8 5 Variable frequency driver VFD 139 8 6 Noise filters NF 140 8 7 Capacitor CB1 CB2 Only for RASC 8 10 HNPE 141 8 8 Reactor DCL 142 8 8 1 Reactor for RASC 4 6 HNPE 142 8 8 2 Reactor for RASC 8 10 HNPE 142 8 9 Scroll compressor 143 8 9 1 Reliable mechanism for low vibrating and low sound 143 8 9 2 Principle of...

Page 9: ... Troubleshooting procedure 196 10 2 1 On screen displays during abnormal operation 196 10 2 2 Alarm codes 197 10 2 3 Troubleshooting by alarm code 199 10 3 Troubleshooting in check mode 245 10 3 1 Troubleshooting using the remote controller PC ART 245 10 3 2 Troubleshooting using the remote controller PC ARF 255 10 3 3 Troubleshooting using the 7 segment display 261 10 4 Checking procedure for mai...

Page 10: ...Maintenance work 287 11 3 Service and maintenance record 288 11 4 Service and maintenance record using the 7 segment display 289 11 5 Service and maintenance record by remote control switch 291 11 6 Pump down method for replacing the compressor 292 ...

Page 11: ... 1 1 2 Introduction 2 1 1 3 Environment friendly units 2 1 2 Applied symbols 3 1 3 Product guide 4 1 3 1 Classification of RASC unit models 4 1 3 2 Classification of indoor unit models 4 1 3 3 Product guide RASC units 4 1 3 4 Product guide Indoor units 5 1 3 5 List of accessories 8 1 General information ...

Page 12: ...ritten authorization from the manufacturer NOTE This air conditioner has been designed for standard air conditioning for human beings For use in other applications please contact your HITACHI dealer or service contractor CAUTION This unit is designed for commercial and light industrial application If installed in house hold appliance it could cause electromagnetic interference 1 1 2 Introduction R...

Page 13: ...n and instructions relating directly to your safety Not taking these instructions into account could lead to serious very serious or even fatal injuries to you and others In the texts following the danger symbol you can also find information on safety procedures during unit installation CAUTION The text following this symbol contains information and instructions relating directly to your safety No...

Page 14: ...4 series E Made in Europe M Made in Malaysia Made in Japan i Version up RCI only k Version up RCI for P AP160NA 1 E panel only DU Drain Up RPIM only f Non flammable insulation RPI 8 0 20 0 FSN3E f only XXX X X FS N H X X i xx 1 3 3 Product guide RASC units RASC Unit Code Unit Code RASC 4HNPE 7E343107 RASC 5HNPE 7E343108 RASC 6HNPE 7E343109 RASC 8HNPE 7E343110 RASC 10HNPE 7E343111 NOTE Check the ex...

Page 15: ...SN3 60278119 RCIM 1 0FSN4 60278217 RCI 1 5FSN3Ei 7E403015 RCI 1 5FSN3Ek 7E404002 RCI 1 5FSN3 60278120 RCIM 1 5FSN4 60278218 RCI 2 0FSN3Ei 7E403016 RCI 2 0FSN3Ek 7E404003 RCI 2 0FSN3 60278121 RCIM 2 0FSN4 60278219 RCI 2 5FSN3Ei 7E403017 RCI 2 5FSN3Ek 7E404004 RCI 2 5FSN3 60278122 RCIM 2 5FSN4 60278220 RCI 3 0FSN3Ei 7E403018 RCI 3 0FSN3Ek 7E404005 RCI 3 0FSN3 60278123 RCI 4 0FSN3Ei 7E403020 RCI 4 0F...

Page 16: ...60278031 RPC 2 0FSN3 60278165 RCD 2 5FSN2 60278032 RPC 2 5FSN3 60278166 RCD 3 0FSN2 60278033 RPC 3 0FSN3E 7E443005 RPC 3 0FSN3 60278167 RCD 4 0FSN2 60278034 RPC 4 0FSN3E 7E443007 RPC 4 0FSN3 60278168 RCD 5 0FSN2 60278035 RPC 5 0FSN3E 7E443008 RPC 5 0FSN3 60278169 RPC 6 0FSN3E 7E443009 RPC 6 0FSN3 60278170 Panels RCD P N23DNA 60297211 P N46DNA 60297212 NOTE The RCD models must be used in combinatio...

Page 17: ... RPI 6 0FSN4E 7E424022 RPI 8 0FSN3E 7E424010 RPI 8 0FSN3E f 7E424410 RPI 10 0FSN3E 7E424011 RPI 10 0FSN3E f 7E424411 RPK RPF RPFI Wall type Floor type Floor concealed type Unit Code Unit Code Unit Code RPK 0 8FSN3M 60278146 RPK 0 8FSNH3M 60278154 RPK 1 0FSN3M 60278147 RPF 1 0FSN2E 7E450001 RPFI 1 0FSN2E 7E460001 RPK 1 0FSNH3M 60278155 RPK 1 5FSN3M 60278148 RPF 1 5FSN2E 7E450002 RPFI 1 5FSN2E 7E460...

Page 18: ...n the panel Compatible with PC LH3A 60291464 PC ALHN 60291627 PC ALHD Receiver kit For RCD FSN2 on the panel Compatible with PC LH3A 60291467 PC ALH3 Receiver kit For RCI FSN3 and RCI FSN3Ek on the panel Compatible with PC LH3B 60291767 PC ALHP1 Receiver kit For RPC FSN3 on the panel Compatible with PC LH3B 60291823 PC ALHC1 Receiver kit For RCIM FSN4 on the panel Compatible with PC LH3B 60292003 ...

Page 19: ...ame Description Code Figure CSNET WEB PSC A160WEB1 Centralised control system which runs CSNET WEB software to control the indoor units 7E512000 CSNET Manager LT Centralised control with a touch interface of 12 inches which runs CSNET MANAGER software to control the indoor units 7E512201 CSNET Manager XT Centralised control with a touch interface of 17 inches which runs CSNET MANAGER software to c...

Page 20: ...intelligent control BMS through CSNET WEB Gateway Interface to KNX systems 7E512100 HARC BX E A Integration with installation with intelligent control Building Management System Gateway Interface to LONWORKS systems H LINK I communication Max 64 units with 8 parameters 60290874 HARC BX E B Integration with installation with intelligent control Building Management System Gateway Interface to LONWOR...

Page 21: ... MB and HC A64NET 7E512306 NOTE In addition to all the aforementioned HITACHI controls there are some non HITACHI devices for combination with HITACHI Air Conditioning systems Please refer to the Technical Catalogue of Controllers for Package for more information Complementary systems DX Interface DX Interface Control box Expansion valve box Unit Code EXV 2 0E1 7E610900 EXV 2 5E1 7E610901 EXV 3 0E...

Page 22: ... pipe UTOPIA pipe kit 70527012 TE 04N1 70527013 TE 56N1 70527014 TE 08N 70800003 TE 10N 70800004 TW 52AN 60291816 TW 102AN 60291817 TG 53AN 60291818 TG 103AN 60291819 TRE 46N1 Distributor UTOPIA 70527015 TRE 812N1 70527016 QE 812N1 Distributor UTOPIA 70527017 E 102SN3 Branch pipe multikit 70524101 E 162SN3 70524102 ...

Page 23: ... 15 2 2 1 Hanging method 15 2 2 2 Handling unit centre of gravity 16 2 3 Factory supplied components 16 2 4 Installation space 17 2 5 Interchangeability of air inlet and outlet panels 18 2 6 Installation place provision 24 2 7 Fan performance curves 25 2 8 Duct connection 27 2 Unit installation ...

Page 24: ...able and nontoxic cleaning liquid Use of inflammable agent may cause explosion or fire Pay attention not to clamp cables when attaching the service cover to avoid electric shock or fire Keep clearance between the units of more than 50mm and avoid obstacles that may hamper air intake when installing more than one units together Install the RASC unit in the shade or not exposed to direct sunshine or...

Page 25: ... condition with two ropes as shown in the figure Do not remove the plastic band or the corrugate paper frame Pass the wire ropes through each lifting hole in the base as shown Wire rope CAUTION Apply two lifting wires on to the RASC unit when lifting it by crane For safety reasons ensure that the RASC unit is lifted smoothly and does not lean Do not attach lifting equipment to the plastic band or ...

Page 26: ... Gross weight kg RASC 4HNPE 218 RASC 5HNPE 218 RASC 6HNPE 218 RASC 8HNPE 333 RASC 10HNPE 336 2 3 Factory supplied components Unpack the unit and check that The package contains all the components see next table All components are in perfect condition Otherwise contact the manufacturer Name Quantity Comments Declaration of conformity 1 Transparent label 1 For attaching in the refrigerant label Inst...

Page 27: ...d servicing space for fan unit in those cases where it is not possible to access from the unit s side In these cases a removable servicing duct or a removable grille in case of installing the unit next to a wall shall be installed to allow replacement of the fan unit whenever necessary which should be made from the unit s front side ...

Page 28: ...There are two different configurations depending on the air inlet panel position Air inlet panel factory supplied position Air inlet panel optional position Air inlet panel Cycle service cover Air inlet panel Cycle service cover Procedure to change the air inlet panel from factory supplied position to the optional position When the air inlet panel position has to be changed the following instructi...

Page 29: ...position Air outlet panel and fan unit optional position Fan service cover Air outlet panel Air outlet panel Fan service cover Procedure to change the fan unit from factory supplied position to the optional position When the air outlet panel position has to be changed the fan unit position must be modified by following this procedure 1 In order to access to the unit s internal parts remove the fol...

Page 30: ...e foot NOTE There is little space to remove the fixing screws in this side Use box spanner or universal joint in order to facilitate the work Nuts NOTE Keep the two 2 washers 1 flat washer 1 spring washer of each screw to use it when reassembling 4 Remove the fan duct assembly by following these steps a Remove the 8 screws of the fan duct assembly Save these screws as they will be needed for the a...

Page 31: ...slightly turn it to the optional position place both fan unit feet into their corresponding bolts for this optional position and fix the 4 screws to the fan unit feet CAUTION When lifting the fan unit up at least two people are required one from each side Bolts for the factory supplied position Bolts for the optional position 7 Place the wiring to the new position and fix them using the clamps as ...

Page 32: ...ate with a notch Ensure that they match for a correct assembly ii Once those plates match proceed to tighten the 4 screws 1 for each edge The screws must have been kept from the disassembly of the fan duct assembly iii After the accessory is mounted proceed to place it to the fan unit The notch must be at the top left side of the fan unit 8 screws are required to fix the duct accessory which must ...

Page 33: ...2 Unit installation Interchangeability of air inlet and outlet panels SMGB0091 rev 2 11 2015 23 2 11 Finally install all the covers again screwing them ...

Page 34: ...3 Nº Description Unit Cut this portion of bolt If not it s difficult to remove Service Cover Mortar Hole Ø100xDepth 150 Anchor Bolt M10 Drainage Wide 100xDepth 150 Drainage Vibration proof rubber Drain pipe Floor mounted 25mm 30mm Ceiling suspended 1 Suspend the unit as the drawing indicates 2 Ensure that ceiling can resist the unit weight which is indicated into the specification label 3 Install ...

Page 35: ...able according to the external static pressure Pa air flow volume m3 min RASC 4HNPE RASC 5HNPE External Static Pressure Pa 0 10 20 30 40 50 60 70 80 90 100 110 120 130 40 45 50 55 60 65 70 75 80 External Static Pressure Pa 0 10 20 30 40 50 60 70 80 90 100 110 120 130 40 45 50 55 60 65 70 75 80 Air flow m min Air flow m min RASC 6HNPE RASC 8HNPE External Static Pressure Pa 0 10 20 30 40 50 60 70 80...

Page 36: ...an unit The correct static pressure setting Low Medium High has to be selected using the PSW and 7 segment display on the RASC PCB according to the pressure values below RASC 4 5 HP No setting is required RASC 6 8 HP Select the Medium pressure setting f2 1 for external static pressures higher than 50 Pa RASC 10HP Select the most suitable static pressure setting depending on the installation condit...

Page 37: ...Duct connection SMGB0091 rev 2 11 2015 27 2 2 8 Duct connection Install the duct with down slope to prevent entry of rain water Also provide insulation for duct and connection in order to prevent dew formation 1 50 or more ...

Page 38: ......

Page 39: ...ze and multikit distributor selection 43 3 3 6 Considerations when installing distributors 47 3 4 Refrigerant charge 48 3 4 1 Refrigerant charge amount 48 3 4 2 Refrigerant charge procedure 50 3 4 3 Caution of the pressure by check joint 51 3 4 4 Pump down refrigerant 51 3 5 Caution in case of refrigerant leakage 52 3 5 1 Maximum permitted concentration of HFCs 52 3 5 2 Calculation of refrigerant ...

Page 40: ...ting pipes 4 After connecting the refrigerant piping seal the open space between the knockout hole and refrigerant pipes by using insulation material as shown below Insulation Field supplied refrigeration piping Insulation Insulation NOTE If copper pipe is used for piping bigger than Ø19 05 flaring work can not be performed If necessary use a joint adapter CAUTION Do not use saws grindstone or oth...

Page 41: ...day or longer solder the ends of the piping to close them and load with oxygen free nitrogen using an access device such as a Schrader valve to avoid moisture and contamination by extraneous particles Do not use insulation material containing NH3 as it can damage the copper piping material and may be a source of future leakage 3 1 3 Insulation Attach insulation package with the Multikit to each br...

Page 42: ...to gas approx 1000 lrs at 1 Torr Therefore it takes long time to vacuum pump by a small vacuum pump 2 Clean No dust inside of pipes Infiltration of dust or other through the pipe ends Oxidation film during brazing without blowing nitrogen Insufficient flushing by nitrogen after brazing Clogging of expansion valve capillary tube and filter Oxidation of oil Compressor failure Insufficient cooling or...

Page 43: ...razing process it will cause clogged capillary pipes or serious compressor failure It is important to control the clearance of the pipe fitting portion as shown below In the case that a cooper tube expansion jig is used following dimensions should be secured In order to guarantee a proper brazing neck between different pipes surfaces accurate pipe dimensions after the expansion process see the fol...

Page 44: ... 03 to 0 05 MPa If a excessively high pressure is applied to a pipe it will cause an explosion 3 2 Piping connection for RASC unit The stop valves are located on the right side of unit cover Before connecting refrigerant piping the stop valve protection cover shall be removed Gas valve Liquid valve 1 Mount the piping cover in order to avoid water entering into the unit Seal the holes where pipes a...

Page 45: ...excessive it may cause refrigerant leakage from the spindle part 3 Perform the air tight test after the tightening work It is more effective to perform this work after fix the flare nuts for the piping connection to the stop valves 4 Use the charging hose for the check joint connection When removing the charging hose from the check joint a sound may be heard by a small quantity of refrigerant leak...

Page 46: ...ers here for pipe connection Do not work with two spanners here Refrigerant leakage shall occur Position to apply spanners Don not apply two spanners work here Spindle type Ball type CAUTION At the test run fully open the spindle and ball stop valve If not fully opened the devices will be damaged Do not attempt to turn service valve rod beyond its stop Do not loosen the stop ring If the stop ring ...

Page 47: ...tion film will occur inside of tubes if no nitrogen gas blowing is performed during brazing work This film will be flecked off after operation and will circulate in the cycle resulting in clogged expansion valves etc This will cause bad influence to the compressor Use a reducer valve when nitrogen gas blowing is performed during brazing The gas pressure should be maintained within 0 03 to 0 05 MPa...

Page 48: ...t of B C L A the longest of B C D 4 indoor units system Case a Case b Only for 8 10 HP L A the longest of B the longest of D E C the longest of F G L A the longest of B C D E NOTE L and H are the length and height indicated in the above chart For 1 2 or 3 indoor unit systems the length is the distance between the RASC unit and the farthest indoor unit The liquid piping and the gas piping must be o...

Page 49: ...en RASC unit and indoor unit H RASC unit higher than indoor unit 30 Indoor unit higher than RASC unit 20 Maximum height difference between indoor units 10 Maximum height difference between multikits and between multikit and indoor unit 3 NOTE It is recommended that the refrigerant piping length from the RASC unit to the first branch A is greater than the piping length from the first branch to the ...

Page 50: ... Nevertheless when the height difference between the indoor units due to building construction is necessary this should be less than the value indicated in the figure RASC RASC NOTE All pictures are shown as an example 3 Piping work and refrigerant charge Refrigerant piping range SMGB0091 rev 2 11 2015 40 ...

Page 51: ...gth L1 75 100 Equivalent piping length EL 95 125 Maximum total piping length L1 L31 L32 L3n 1 95 100 145 Maximum piping length from the 1st multikit to the furthest indoor unit L2 30 40 Maximum piping length between multikit and indoor unit L31 L32 L33 L3n 10 15 Maximum height difference between RASC unit and indoor unit Hi o RASC unit higher than indoor unit 30 Indoor unit higher than RASC unit 2...

Page 52: ... Ø25 40 Ø28 58 Ø22 20 Ø25 40 Ø28 58 4 6 HP 5 2 5 2 40 1 75 5 4 30 3 30 3 4 8 HP 50 1 4 6 50 1 6 70 5 6 50 1 3 4 50 1 3 100 50 1 3 50 3 10 HP 50 1 100 50 50 1 3 50 3 50 3 1 Reducing gas pipe size will reduce cooling capacity due to larger pressure loss in gas piping and narrow operation range 2 Reducing liquid pipe size will narrow operation range due to the indoor unit relation with expansion valv...

Page 53: ...ters Gas pipe adapter Ø22 2 to Ø25 4 Liquid pipe adapter Ø9 52 to Ø12 7 2 indoor units system mm Multi kit RASC unit Pipe size A Gas Liquid TE option TW option 4 HP Ø15 88 Ø9 52 TE 04N1 TW 52AN 5 6 HP Ø15 88 Ø9 52 TE 56N1 TW 52AN 8 HP Ø25 4 Ø9 52 TE 08N TW 102AN 10 HP Ø25 4 Ø12 7 TE 10N TW 102AN In case that pipe length exceeds 70m in 8 HP please use a Ø12 7 pipe as a liquid pipe with its respecti...

Page 54: ... A B or A C or A D exceeds 70m in 8 HP please use a Ø12 7 pipe as a liquid pipe In case of combinations with 8 0HP or 10 0HP indoor units install a line branch system with multi kits E 162SN3 and E 102SN3 The dimensions for TRE and TG multi kits are different Refer to the Indoor units Technical Catalogue in order to check the dimensions mm Indoor unit capacity after branch Pipe size B C Gas Liquid...

Page 55: ...E 56N1 TW 52AN 10 HP Ø25 4 Ø12 7 TE 10N TW 102AN In case that pipe length A B C or D or A C F or G exceeds 70m in 8 HP please use a Ø12 7 pipe as a liquid pipe The dimensions for TRE and TW multi kits are different Refer to the Indoor units Technical Catalogue in order to check the dimensions mm Indoor unit capacity Pipe Size D E F G Gas Liquid 0 8 1 5 HP Ø12 7 Ø6 35 1 8 2 0 HP Ø15 88 Ø6 35 2 3HP ...

Page 56: ...rthest indoor unit exceeds 70m in 8 HP please use a Ø12 7 pipe as a liquid pipe mm Indoor unit capacity Pipe Size L3 Gas Liquid 0 8 1 5 HP Ø12 7 Ø6 35 1 8 2 0 HP Ø15 88 Ø6 35 2 3 6 0 HP Ø15 88 Ø9 52 8 0 HP Ø19 05 Ø9 52 10 0 HP Ø22 20 Ø9 52 NOTE In combinations with 10 0HP indoor units only one of the two connections of the E 102SN3 multi kit admits the Ø22 20 mm diameter corresponding to the gas p...

Page 57: ...Vertical To indoor unit Fixing the branch pipe to the surface of pillar or wall Horizontal Horizontal Fixing the branch pipe to ceiling or beam NOTE Fix the piping from outside of insulation or inserting absorber between the pipe and a fixing metal 3 Correct position of twin distributor available also for quad installation This is the correct position Greater than 0 5 m Main pipe Refrigerant direc...

Page 58: ... 6HNPE 4 2 60 3 9 RASC 8HNPE 5 7 1 6 3 RASC 10HNPE 6 2 1 8 1 1 Needs to be calculated Calculation method for the additional refrigerant charge Calculate the additional refrigerant charge amount according to the following steps Step 1 Additional refrigerant charge calculation for liquid piping W1 kg RASC units have been charged with refrigerant for 30 m of actual piping length In systems with longe...

Page 59: ...ut weight W1 and W2 calculated in step 1 and step 2 into the following formula W W1 W2 System example W kg For RASC 8 10 HNPE units In case of RASC 8 10 HNPE units the following formula must be used W W1 W2 C System example W kg C Compensation value kg Refer to the following table Model Compensation value C kg RASC 8HNPE 1 6 RASC 10HNPE 2 0 CAUTION Do not exceed the allowed maximum additional char...

Page 60: ...nt charging cylinder to the check joint of the liquid line stop valve Charge the proper quantity of refrigerant according to the piping length Calculate the quantity of the refrigerant charge Fully open the gas line stop valve and slightly open the liquid line stop valve Charge refrigerant by opening the gauge manifold valve Charge the required refrigerant within the difference range of 0 5kg by o...

Page 61: ...ant charge NOTE Be careful that refrigerant and oil do not splash to the electrical parts at removing the charge hoses C B A Right side 3 4 4 Pump down refrigerant When the refrigerant has to be collected into the RASC unit due to indoor RASC unit relocation collect the refrigerant as follows 1 Attach the manifold gauge to the gas and the liquid stop valves 2 Turn ON the RASC unit power source 3 S...

Page 62: ...ecting all the indoor units in the rooms to be air conditioned 2 Calculate the room volume V m of each room 3 Calculate the refrigerant concentration C kg m of the room according to the following equation C R V R Total quantity of refrigerant charged kg V Room volume m C Refrigerant concentration 0 44 kg m for R410A 3 5 3 Countermeasure for refrigerant leakage The facility must have the following ...

Page 63: ... 12 kg System B Refrigerant 6 kg System B RASC unit System A RASC unit Fan 2 m3 min Floor 10 m2 Floor 8 m2 Floor 8 m2 Floor 40 m2 Floor 20 m2 Height 2 5 m Opening 0 06 m2 Room R kg V m3 C kg m3 Countermeasure A 12 25 0 48 2 m3 min fan linked with gas leak detector B 12 20 0 60 0 06 m2 aprox opening C 12 20 0 60 0 06 m2 aprox opening B C 12 40 0 30 D 18 100 0 18 E 6 50 0 12 ...

Page 64: ...l kit optional accessory 4 Install the new unit of the RASC series 5 Vacuum process 6 Refrigerant charge R410A Follow the normal process described in order to determine whether additional refrigerant charge is necessary CAUTION Recovering R22 and R407C is mandatory to remove an existing air conditioner and piping Do not vent into the atmosphere Conditions to use existing pipes with cleaning proces...

Page 65: ...0 50 1 3 50 3 50 3 1 Reducing gas pipe size will reduce cooling capacity due to larger pressure loss in gas piping and narrow operation range 2 Reducing liquid pipe size will narrow operation range due to the indoor unit relation with expansion valve capacity In these cases set the DSW2 1 to ON position 3 Increasing liquid pipe size will require additional refrigerant charge 4 When using Ø19 05 ga...

Page 66: ... port for indoor unit Pipe connection port for RASC unit Flare connection Flare connection For gas pipe ȭ ȭ ȭ ȭ Flare connection Pipe connection port for RASC unit Pipe connection port for indoor unit Flare connection Renewal kit installation Example Strainer for gas pipe with accessory insulation Put tape on insulation crossover Strainer for liquid pipe with accessory insulation Field supplied pi...

Page 67: ...connection It is mandatory to connect a siphon as shown in the figure below Pay special attention when connecting it to the unit proper installation work is needed in order to guarantee matching of connection pipes 75 mm Slope 2 Plug Fasten the siphon to the drain hose with an adhesive and a field supplied clamp Prepare a draining pipe with an internal diameter higher than 30 mm for the draining l...

Page 68: ......

Page 69: ...units 66 4 6 1 Location of DIP switches and RSW switches 66 4 6 2 Functions of dip switches and rotary switches 66 4 6 3 Jumper lead setting JP1 6 69 4 6 4 LED s indication 69 4 7 H LINK II system 70 4 7 1 Application 70 4 7 2 Features 70 4 7 3 Specifications 70 4 7 4 DIP Switch setting for multiple H LINK system 71 4 7 5 Examples of the system of connection between H LINK and H LINK II units 72 4...

Page 70: ... rated voltage 5 Check to ensure that power supply has an impedance low enough to warranty not reduce the starting voltage more than 85 of the rated voltage 6 Check to ensure that the ground wire is connected 7 Connect a fuse of specified capacity CAUTION Check to ensure that screws for terminal block are tightly tightened Check to ensure that the indoor unit fan and the RASC fan have stopped befo...

Page 71: ...multiple RASC units are connected from one power source line The recommended breaker sizes are shown in Table of electrical data and recommended Wiring Breaker Size 1 RASC unit In the case that a conduit tube for field wiring is not used fix rubber bushes with adhesive on the panel CAUTION All the field wiring and electrical components must comply with local codes Pay attention to the connection o...

Page 72: ...ments of the protection devices CAUTION Ensure specifically that there is an Earth Leakage Breaker ELB installed for the units RASC and indoor unit If the installation is already equipped with an Earth Leakage Breaker ELB ensure that its rated current is large enough to hold the current of the units RASC and indoor NOTE Electric fuses can be used instead of magnetic Circuit Breakers CB In that cas...

Page 73: ... of 2 core wires Do not use wire with more than 3 cores Use shielded wires for intermediate wiring to protect the units from noise interference with a length of less than 300m and a size in compliance with local codes In the event that a conduit tube for field wiring is not used fix rubber bushes to the panel with adhesive CAUTION Ensure that the transmission wiring is not wrongly connected to any...

Page 74: ...N5A Micro electronic expansion valve CN6 Transmission between PCB1 and DIP IPM CN7 External output CN8 Transmission from RASC to indoor unit CN10 Communication line between PCB1 and PCB3 CN100 Discharge pressure Pd CN404 Line connection between PCB1 and DIP IPM EF1 2 3 EFR1 Power protection Switch indication DSW1 Test run DSW2 Auxiliary function setting DSW3 Capacity code DSW4 RSW1 Refrigerant cyc...

Page 75: ... unit CN10 Communication line between PCB1 and PCB3 CN100 Discharge pressure Pd CN102 Line connection between PCB1 and PCB3 CN404 Line connection between PCB1 and PCB3 EF1 2 3 EFR1 Power protection PCB1 Switch indication Connector Name DSW1 Test run DSW2 Auxiliary function setting DSW3 Capacity code DSW4 RSW1 Refrigerant cycle number DSW5 End terminal resistance DSW6 Simultaneous individual operat...

Page 76: ...DSW1 Test run Setting before shipment Test Run for cooling Continuous operation during 2 hours is performed without thermo OFF The 3 minutes guard for compressor protection is not effective during the test run operation Test Run for heating Enforced compressor OFF Compressor operation is OFF during the operation NOTE This operation is reset once the compressor is in Thermo ON mode During the test ...

Page 77: ... 05 gas pipe soft annealed Function selection setting Function selection is set by PSW External input output selection External input output selection is set by PSW DSW3 Capacity setting No setting is required RASC 4HNPE Setting before shipment RASC 5HNPE RASC 6HNPE RASC 8HNPE RASC 10HNPE DSW4 and RSW1 Setting number of refrigerant cycles Setting is required Setting for the tenth digit Setting bef...

Page 78: ...ol wiring H LINK Control wiring H LINK DSW6 Setting of indoor unit control operation Individual control operation Setting before shipment Simultaneous control operation Individual control Simultaneous control 1 2 ON DSW6 1 2 ON DSW6 1 2 ON DSW6 Operating line Remote control line Individual control Running ON OFF individually Thermo ON OFF individually 1 2 ON DSW6 1 2 ON DSW6 1 2 ON DSW6 Operating ...

Page 79: ... V power source voltage JP4 Fixing for cooling only When JP4 is set to open operation mode is fixed for cooling Thermo ON is available only by COOL or DRY mode at indoor unit JP5 Self diagnosis For function test of the RASC unit control PCB Factory default setting is open When power ON in short condition it enters self diagnosis JP6 Phase detection release Phase detection abnormality not detected ...

Page 80: ...ng between the indoor and RASC units The wiring connection of the complementary central control devices is easy NOTE CSNET WEB or CSNET Manager are centralised control systems which allow the installation to be controlled remotely They can be connected at any point of the local corporate network or even via the Internet 4 7 3 Specifications Transmission cable 2 wire Polarity of transmission cable ...

Page 81: ...stem Indoor unit Refrigerant cycle DSW5 RSW2 For setting the refrigerant cycle address of the indoor unit Set the DSW5 and RSW2 corresponding to the address of RASC unit in the same refrigerant cycle Address of the indoor unit DSW6 RSW1 Setting indoor unit address Set the DSW6 and RSW1 not to overlap the setting of other indoor units in the same refrigerant cycle If no set the automatic address fu...

Page 82: ... units in the first 16 position of the system as in the following example where 42 systems are connected 16 with indoor FSN1E units and 26 with indoor FSN H 2 3 4 E M i DU units A A A A A A A A A D D D D C B F E A Refrigerant cycle B RASC unit C Indoor unit D Indoor unit address E Either the current remote control switch H LINK or the new one H LINK II can be used F Only the new remote control swi...

Page 83: ...g the H LINK II system for air conditioning systems without a central control device Neither centralised remote controls nor Building air conditioning controls Line connection with all units A B C A RASC units B Indoor units C Do not install wiring in a loop Line connection for each floor A B A RASC units B Indoor units ...

Page 84: ...specified in the DIP switches on the PCB 2 Using the H LINK II system for air conditioning systems with a central control device Either centralised remote controls or Building air conditioning controls If the central control device is used when carrying out electrical wiring it can be connected at any point of the H LINK II wiring A B Centralised remote controls Building air conditioning controls ...

Page 85: ...4 Electrical and control settings Electrical wiring diagrams SMGB0091 rev 2 11 2015 75 4 4 8 Electrical wiring diagrams 4 8 1 RASC 4 6 HNPE 3N 400V 50Hz XEK25149 ...

Page 86: ...4 Electrical and control settings Electrical wiring diagrams SMGB0091 rev 2 11 2015 76 4 8 2 RASC 8 10 HNPE 3N 400V 50Hz XEK25156 ...

Page 87: ...matic cooling and heating operation 86 5 3 5 Defrost operation control 87 5 4 Standard control functions 89 5 4 1 Freezing protection during cooling process or dry operation 89 5 4 2 Prevention control for excessively high discharge gas temperature 90 5 4 3 Activation for protection device control 91 5 4 4 Preheating control of compressor 92 5 4 5 Prevention control for high pressure increase duri...

Page 88: ...e temperature Tl difference The expansion valve opening degree is controlled according to the number of connected IU for individual operation Specified opening degree at normal control starting Afterward controlled to optimise IU liquid pipe temperature Tl The expansion valve opening degree is controlled according to the number of connected IU for individual operation Specified opening degrees con...

Page 89: ...ection Internal thermostat that is embedded in the fan motor winding this internal thermostat cuts out the operation of the fan motor when the temperature of the fan motor winding exceeds the setting RASC safety and control device setting Model RASC 4 6 HNPE RASC 8 10 HNPE High pressure switch for compressor Type Automatic Reset Non Adjustable each one for each compressor Cut Out MPa 0 05 0 05 4 1...

Page 90: ...mperature indicated Pressing TEMP switch Switch increasing set temperature Switch decreasing set temperature Pressing RUN STOP switch Run LED ON RUN is indicated Power to PCB in R U ON Power to YH2 in I U ON Pressing FAN switch Air flow change over switch HIGH indication MEDIUM indication LOW indication Power to YH2 for 20 sec Operation at set indoor fan speed MD ON for unit with drain pump Power ...

Page 91: ...rain pump 80 ºC 75 ºC Power to CH ON Power to CH OFF Power to Y52C OFF Stop of MOF Power to YH2 OFF Yes No RUN STOP lamp OFF COOL set fan speed set temp indication continuously ON STOP Power to indoor unit OFF Power to RASC unit OFF LCD indication OFF Power to PCB in indoor unit OFF Power to CH OFF Power to PCB in RASC unit OFF from 1 Pressing AUTO LOUVER switch Stop of AUTO LOUVER Start of AUTO L...

Page 92: ...wer than activation level for unit with drain pump Setting at DRY DRY indication Set temperature indicated Pressing TEMP switch Switch increasing set temperature Switch decreasing set temperature Pressing RUN STOP switch Run LED ON RUN is indicated Power to YH2 ON MD ON for unit with drain pump IU Fan Operation Low IU air intake temp DRY operation Power to MC OFF Power to MIF OFF 6 min IU fan oper...

Page 93: ...th drain pump 80 ºC 75 ºC Power to CH ON Power to CH OFF Power to Y52C OFF Stop of MOF Power to YH2 OFF Yes No STOP Power to indoor unit OFF Power to RASC unit OFF LCD indication OFF Power to PCB in indoor unit OFF Power to CH OFF Power to PCB in RASC unit OFF RUN STOP lamp OFF DRY set fan speed set temp indication continuously ON from 1 Pressing AUTO LOUVER switch Stop of AUTO LOUVER Start of AUT...

Page 94: ...ecreasing set temperature Pressing RUN STOP switch Run LED ON RUN is indicated IU air intake temp HEATING operation to 1 Higher than set Temp 2 ºC Thermo OFF Lower than set temp Thermo ON 25 ºC 30 ºC Lower than 25 ºC Power to CMC ON 1 sec IU air discharge temp Yes Power to MOF Power to PCB in O U ON Pressing FAN switch Air flow change over switch HIGH indication MEDIUM indication LOW indication Po...

Page 95: ...C Higher than 50 ºC RUN STOP lamp OFF HEAT set fan speed set temperature indication continuously ON STOP Power to indoor unit OFF Power to RASC unit OFF LCD indication OFF Power to PCB in indoor unit OFF Power to CH OFF Power to PCB in RASC unit OFF Slow fan speed IU discharge air temp Operation at slow speed Lower than 40 ºC After 2 minute Higher than 40 ºC Shorter than 2 min Reset of timer for d...

Page 96: ...intake temperature Lower than set temperature Higher than set temperature Higher than 3ºC in set temperature Lower than set temperature Higher than 2ºC in set temperature Lower than 3ºC in set temperature Heating operation I U air intake temperature Fan operation I U air intake temperature Higher than 3ºC in set temperature Lower than 3ºC in set temperature Lower than 2ºC in set temperature Higher...

Page 97: ...ow fan speed MIF 30ºC 25ºC to 30ºC 25ºC Defrosting operation The following defrosting operations Standard Defrost Forced Defrost and Manual Defrost are available 1 Standard Defrost This operation is started according to the outdoor temperature the outdoor evaporating temperature and operating time 2 Forced Defrost This operation starts when the indoor unit is operated Thermo ON OFF repeatedly and ...

Page 98: ...r the defrosting operation is performed d The compressor is operated continuously for more than 1 and half minutes e The outdoor evaporating temperature is lower than 5ºC right before starting the operation f The pressure switch for control is OFF Condition for completing defrost operation The defrosting operation is stopped when any of following conditions are met 1 The outdoor evaporating temper...

Page 99: ...ng on the conditions Higher than 0 ºC No Lower than 0 ºC Yes Gas or liquid pipe surface temperature of indoor heat exchanger Lower than 11ºC Higher than 11 ºC Lower than 2 ºC Higher than 2 ºC Liquid pipe temperature of indoor heat exchanger Power supply Compressor and indoor unit fans OFF Outdoor ambient temperature Cooling or dry operation Gas or liquid pipe surface temperature of indoor heat exc...

Page 100: ...ture CMC OFF Outlet air temperature of indoor unit Heating operation Is it continuous for more than 3 min Discharge air temperature of indoor unit Is setting temperature lower than inlet air temperature of indoor unit CMC ON Compressor RUN Compressor stop Higher than 65 ºC Yes Lower than 60 ºC Yes Lower than 65 ºC Higher than 60 ºC No No ...

Page 101: ...h temperature of IU fan motor ITI open MIF stop Overcurrent 5A to control circuit Overcurrent 5A to control circuit High temperature of RASC unit fan Blown fuse EFR1 on IU Blown fuse EFR1 on RU ITO Open Power to IU transformer OFF Light and LCD are not indicated B B Blown fuse EF1 EF2 Overcurrent to MC Activation of RU PCB protection device A B Excessively high discharge gas temperature High press...

Page 102: ...compressor Condensing temperature 15ºC Power to RASC unit ON Compressor ON Condensing temperature 15ºC Condensing temperature 20ºC Condensing temperature 20ºC 5 4 5 Prevention control for high pressure increase during cooling operation This function is performed to prevent the abnormal condition Alarm Code 02 when the air flow volume is abnormally decreased When the following conditions are met th...

Page 103: ...ignals 94 6 1 1 Input and output signals through 7 segment display on the RASC unit PCB 94 6 1 2 Input and output signals through remote control switch 100 6 2 Optional functions 101 6 2 1 Optional functions through 7 segment display on the RASC unit PCB 101 6 2 2 Optional functions through remote control switch 109 ...

Page 104: ...of these input and output signals represents the selection of some optional functions programmed in the PCB of the RASC unit through the 7 segment display Available ports The system has the following input and output ports Content Setting of the port in the PCB of the RASC unit Remarks Outlet Inputs 1 2 of CN1 Contact 2 3 of CN1 Contact i3 1 2 of CN2 Contact Outputs 1 1 2 of CN7 DC 12V 2 1 3 of CN...

Page 105: ...nectors as one set Wire control Voltage 12V DC 0 5 mm Wire power Voltage 230V 2 0 mm NOTE The connection of the input signal is only an example Keep the CN1 and CN2 wires as short as possible Do not run transmission wiring along 230 V 400 V CA power supply cables Leave a distance of more than 30 cm between them Intersection are occasionally allowed If you install the wires along a power supply wir...

Page 106: ...pplication No setting 5 Forced stoppage This signal allows to control the stoppage of the compressor and the fans of the indoor as well as RASC units This function can be useful when used with the alarm signals of the fire prevention systems 6 Current control demand 60 These signals allow to regulate the input current around the selected percentage 60 70 80 or 100 of the maximum compressor current...

Page 107: ...y pressing the push switch PSW1 the function number can be changed See the flowchart shown in the side 5 After selecting the function number return pin 6 of DSW2 to OFF position 6 Set pin 4 of DSW1 to OFF The selected contents are memorised in the RASC unit printed circuit board and the function selection mode is stopped The memorised data is maintained even power source lines are disconnected The...

Page 108: ...put the indoor unit in Thermo OFF condition When the compressor is stopped this function allows the operation of the indoor unit fans to prevent air stratification Stoppage code d1 10 is displayed on the remote control If the switch of this function is disconnected it becomes available again Connect the cabling and use the materials as shown in section Available ports Forced stoppage 5 This signal...

Page 109: ...notify that protection devices have been activated and to transfer it to additional systems Connect the cabling and use the materials as shown in section Available ports Note that the contact of auxiliary relay X3 is closed when an operation signal is issued Compressor ON signal 3 This optional signal is used to pick up the signal when the compressor is ON It can be used to check how the compresso...

Page 110: ...lay codes Indication Input Output 00 Not set Not set 01 Room Thermostat for Cooling Operation 02 Room Thermostat for Heating Alarm 03 Remote ON OFF 1 Level Cooling 04 Remote ON OFF 2 Operation Thermo ON for Cooling 05 Remote ON OFF 2 Stoppage Heating 06 Forbidding Remote Control after Manual Stoppage Thermo ON for Heating 07 Remote Cooling Heating Change Total Heat Exchanger 08 Elevating Grille In...

Page 111: ... becomes available and the following indication appears on the 7 segment display F A 1 Fixing of demand function Available This example indicates that optional function Control of the indoor unit fan during Thermo OFF in heating mode is available 3 By pressing the push switches PSW2 and PSW3 the optional function can be changed See the flowchart shown in the next page 4 By pressing the push switch...

Page 112: ...f the indoor expansion valve during heating operation stoppage Si 0 Not Available 1 2 Available Opening of the indoor expansion valve during heating thermo OFF So 0 Not Available 1 2 Available Initial opening of the indoor expansion valve at starting in heating operation ci 0 Not Available 1 2 Available Low noise setting db 0 Not Available 1 Available Fixing of current control demand function dE 0...

Page 113: ...his function is enabled Night mode Low noise ni This function reduces the outdoor fan speed and the maximum compressor frequency value in cooling operation according to the outdoor air temperature in order to reduce sound in low load conditions Outdoor fan operation during this function 22 25 60 80 110 30 33 Maximum fan speed percentage Outdoor temperature ºC NOTE This function is only available i...

Page 114: ...r defrosting operation results in a lower amount of accumulated frost therefore keeping higher heating capacity values Setting condition Function selection setting Jo 0 By default Function selection setting Jo 1 Temperature conditions under defrosting operation Outdoor evaporating temperature ºC Pipe Defrosting operation start area Outdoor temperature ºC Outdoor evaporating temperature ºC Pipe Def...

Page 115: ...opening of the indoor unit expansion valves during heating operation stoppage to opening values higher than the standard opening value in heating operation stoppage NOTE For more information about this function please contact with your HITACHI dealer Opening of the indoor expansion valve during heating thermo OFF Control function 5o This function allows to modify the opening of the indoor unit exp...

Page 116: ... which has been selected through external input signals on the 7 segment display 60 70 80 or 100 without the need to short circuit the input terminals CN1 or CN2 The following table shows the current control demand setting according to the input signal which has been selected Input signal function number Running current control demand 00 05 10 100 06 60 07 70 08 80 09 100 This function can be acti...

Page 117: ...cold air Depending on the setting of Cold draft protection function the SVA Solenoid valve for high pressure bypass is turned ON Setting condition Temperature ºC Condition 0 Not available default setting 1 12 Cold draft is prevented thanks to the compressor frequency control and turning ON SVA solenoid valve for high pressure bypass circuit 2 12 Cold draft is prevented thanks to the compressor fre...

Page 118: ...g f2 2 For external static pressures higher than 80 Pa Default value Low pressure setting f2 0 In order to do so measure the fan motor current and set the static pressure setting according to the following table For the measurement of the fan motor current please refer to the following drawing Model Fan motor current A Medium pressure setting f2 0 1 High pressure setting f2 0 2 RASC 6HP 1 40 A RAS...

Page 119: ...ompressor operation for at least 3 minutes O 00 Not activated function This function is used to protect the compressor preventing it from being started or stopped for periods of less than three minutes 01 Activated function b4 Pre determined filter cleaning period change O 00 Standard 1200 h factory setting 2 This function is used to modify the period until the next display of filter cleaning sign...

Page 120: ...RPI O 00 Standard static pressure factory set This function is used to change the static pressure of the RPI units from the remote control 01 High static pressure 02 Low static pressure Increasing fan speed 00 Not available This function is used to change the indoor units fan speed installed in high ceilings 01 Hi Speed 1 3 02 Hi Speed 2 3 C6 High speed at heating Thermo OFF O 00 Not activated fun...

Page 121: ...t of a power cut The unit is restarted when the power is re established 01 Activated function d2 Not available X permanent Not available d3 Power supply ON OFF 2 O 00 Not activated function This function is used to restart the unit automatically after a power failure lasting more than 2 seconds 3 minute compressor OFF guard applies 01 Activated function d4 Prevention of discharge air temperature d...

Page 122: ...d as 00 conditions E6 Indoor fan operation time after cooling operation stoppage O 00 Not activated function This function prevents the condensation accumulation in the unit by keeping the fan running after it is switched off as well as to prevent mildew or abnormal odours 01 60 minutes 02 120 minutes E7 Not available O 00 Not available 01 Used as 00 conditions E8 Fan operation control at heating ...

Page 123: ... function provides energy saving 01 Activated function F4 Automatic reset time X 00 30 minutes factory setting This function is used to set the automatic reset time with the temperature setting 01 15 minutes 02 60 minutes 03 90 minutes F5 Automatic reset temperature for cooling X 19 24 19 24 ºC This function is used to set the automatic temperature reset in FAN COOL DRY modes 25 25 C factory setti...

Page 124: ...C 11 Lower limit 11 ºC 12 Lower limit 12 ºC FE Not available 00 Not available 01 Used as 00 conditions 02 FF PC ART Lock function for timer X 00 Not activated function This function is used to lock timer activation 01 Activated function factory setting PC ARF Not available 00 Not available 01 Used as 00 conditions H1 PC ART Maintenance alarms O 00 Display This function is used to display or hide m...

Page 125: ... 00 Green This function allows to select the colour of run indicator between green and red Displayed on PC ARF only 01 Red J4 Not available 00 Not available Displayed on PC ARF only 01 Used as 00 conditions 02 J5 Not available X 00 Not available Displayed on PC ARF only 01 Used as 00 conditions J6 Error sound X 00 Once Displayed on PC ARF only 01 Sequence J7 Not available 00 Not available Displaye...

Page 126: ... at F5 and F6 it is applied within upper and lower limit for the set temperature 7 Operation is stopped by pressing the run stop switch for 3 seconds 8 The sensor value at C8 will be indicated When the thermistor for remote control switch is used the average value of the thermistor for remote control switch and the thermistor for indoor inlet will be indicated 9 When the unit is restarted by the r...

Page 127: ...7 2 Test run procedure using the remote control switch PC ARF 120 7 3 Test run procedure using the remote control switch PC ART 123 7 4 Test run procedure using the wireless remote control switch PC LH3A 125 7 5 Test run procedure from the RASC unit 127 7 6 Check list on test run 128 7 Commissioning ...

Page 128: ...RSW1 of indoor units correspond to the system 4 Make sure that the setting of the DIP switches on the printed circuit board of the indoor units and the RASC units are correct Especially pay attention to the setting of the lift between the indoor units and the RASC units Refer to the chapter 4 Electrical and control settings for details 5 Make sure that the switch on the main power source has been ...

Page 129: ...f electric live part may exist 2 If the resistance is under 1 MΩ remove compressor cables from the inverter PCB and turn the power ON and energize the oil heater Measure the resistance after more than three hours of electric current application If the insulation resistance recovers the compressor does not have problems In case that the resistance does not recover compressor failure may exist More ...

Page 130: ...d AUTO are indicated only for the heat pump type models Operation Guide Indicator Central Control is indicated while the remote control operation is prohibited Room Name Indicator Operation Part Setting Temperature Indicator Help Switch To display Help Menu Return Switch To return to the previous screen Menu Switch To display Menu 1 Turn ON the power supply for all the indoor units 2 For the model...

Page 131: ... electric noise or etc Turn OFF the power supply and correct the wiring after checking the following points Do not repeat turning ON and OFF within 10 seconds Power supply for indoor unit is not turned ON or incorrect wiring Incorrect connectionn of connecting cable between indoor u nits or incorrect connection of controller cable Incorrect setting of rotary switch and dip switch the setting is ov...

Page 132: ... alarm code the unit model code and connected number of indoor units will be displayed on the LCD as shown in the figure below If the RUN indicator on PC ARF flashes 2 seconds ON 2 seconds OFF it may be a failure in the transmission between the indoor unit and the remote control switch loosening of connector disconnecting wiring or breaking wire etc In this case check the item 10 2 2 Alarm codes a...

Page 133: ...ct of the connectors of the remote control cable 4 The screw fastening of each terminal board The counting number of the connected units is incorrect The power source of RASC unit is not turned ON The setting of the unit number is incorrect The connection of the control cables between each indoor unit is incorrect When multiple units are controlled by one remote control switch 5 Setting of the DIP...

Page 134: ...e connection order of the power supply wire between the indoor units and the RASC units The operation LED flickers 1 time 2 sec The unit does not start The connection of the remote control cable is incorrect This is the same as the item 1 2 and 3 The flickering indicator is different from the one above The unit does not start The unit starts once and then the unit stops The connection of the therm...

Page 135: ... LED of the receiver will turn on briefly Make sure that the commands are received well and the selected mode 3 is set correctly In the TEST RUN mode the red RUN LED of the receiver is turned ON and the green TIMER LED flickers 0 5 seconds ON 0 5 seconds OFF 2 Then the timer switches off for two hours NOTE If the yellow LED does not turn ON the commands from the remote control switch may not have ...

Page 136: ...alarm code displays the number of blinks of the green DEF LED and the yellow FILTER LED as shown bellow Green DEF LED Digit 2 of the alarm code blinks Yellow FILTER LED Digit 1 of the alarm code blinks Alphabet code A 10 blinks B 11 blinks C 12 blinks etc Example Yellow FILTER LED Green DEF LED DEF LED blinks three times 0 5 seconds ON 0 5 seconds OFF FILTER LED blinks 5 times 0 5 seconds ON 0 5 s...

Page 137: ...formed without the Thermo OFF condition NOTE TEST RUN operation time can be increased depressing the time switch in the Remote Control If is setting DSW1 3 ON cooling heating intermediate season mode is activated Make sure that the indoor units start to operate in accord with the test run of the RASC unit If you start the test run from the RASC unit and you stop the test run from the remote contro...

Page 138: ...k the outdoor ambient temperature Inlet DB ____ ºC WB ____ ºC Outlet DB____ ºC WB ____ ºC 7 Check the refrigerant temperature Operating mode cool or heat Discharge gas temperature Td _____ ºC Liquid pipe temperature Te _____ ºC 8 Check the pressure Discharge pressure Pd _____kg cm2 G Suction pressure Ps _____kg cm2 G 9 Check the voltage Rated voltage _____V Operating voltage L1 L2 ______V L1 L3___...

Page 139: ...hermistors for RASC unit 136 8 3 Electronic expansion valve 137 8 4 Pressure protection devices 138 8 4 1 Location of the pressure protection devices 138 8 4 2 Description of the pressure protection devices 138 8 5 Variable frequency driver VFD 139 8 6 Noise filters NF 140 8 7 Capacitor CB1 CB2 Only for RASC 8 10 HNPE 141 8 8 Reactor DCL 142 8 8 1 Reactor for RASC 4 6 HNPE 142 8 8 2 Reactor for RA...

Page 140: ...s Conditions 1 Power source voltage AC380 415V 2 Non loading free output 3 Ammeter type volt meter X1 1 Soft start stop 0 125 3 00 Hz s 5 steps Protection function Excessive high or low voltage for inverter Excessive low voltage at a voltage is lower than 350V DC Excessive high voltage at a voltage is higher than 750V DC Abnormality of current sensor 0A detection Stoppage at a current of compresso...

Page 141: ... 10 minutes NOTE Internal protection IPM Condition is maintained longer than 30 seconds or accumulated longer than 3 minutes during 10 minutes sampling time Protection of IPM IPM has four protection functions for self protection 1 Short circuit in any of the U V or W terminals 2 Running current reaches the maximum rated current 3 Abnormal temperature is measured by internal thermistor for 8 10HP 4...

Page 142: ...1 All bit 1 operation The changing speed depends on command from PCB Output Transmitting error 30 sec 10 sec Activation recovery Protection activation Turn ON Charged indication LED5 RED Overload signal Activation of protection device Failure signal Soft start stop frequency Output voltage Frequency instruction Main circuit power source ...

Page 143: ...ously for 30 seconds or for 3 5 minutes in total during a 10 minutes period overcurrent is detected Electric thermal relay b Function When abnormalities are detected the inverter compressor is stopped and transmits the signal code of stoppage cause to PCB1 c Cancellation of protection function Transmission for signal code of stoppage cause is cancelled by stopping order is issued or main power sou...

Page 144: ...ntrol 1 Level of detection When the output current exceeds 105 of the maximum output current an abnormality is detected 2 Function An overload signal is issued when output current exceeds 105 of the maximum output current and the frequency decreases For 10 seconds after the output current decreases lower than 88 of the rated current the operation is performed with the compressor frequency limited ...

Page 145: ...11 2015 135 8 8 2 Thermistor 8 2 1 Summary of thermistors for RASC unit RASC 4 6 HNPE É RASC 8 10 HNPE É Number Identification É Thermistor for discharge gas temperature THM9 Thermistor for outdoor ambient temperature THM7 Thermistor for evaporating temperature THM8 ...

Page 146: ...200 400 600 800 1000 1200 10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Thermistor resistance characteristics Temperature ºC Thermistor resistance kΩ Thermistor for outdoor ambient temperature THM7 and for evaporating temperature THM8 105 4 77 9 58 2 44 0 33 6 25 9 20 2 15 8 12 5 10 0 8 0 6 5 5 3 4 3 3 6 3 0 2 5 0 20 40 60 80 100 120 20 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 Thermistor res...

Page 147: ...rant R410A Working temperature range 30 C 70 C operation time of the coil less than 50 Mounting direction Drive shaft in vertical direction within an angle of 45 as maximum Flow direction Reversible Drive method Permanent magnet type 20 poles Stepping motor direct drive type Rated voltage DC12V 10 Drive condition 80 5 pps for 4 6HP and 63 5 pps for 8 10HP 1 2 phase excitation Coil resistance each ...

Page 148: ...on of the pressure protection devices High pressure switch PSH If the discharge pressure is excessively high the compressor and the component parts of the refrigeration cycle can be damaged Therefore in case that the discharge pressure is higher than 4 15 MPa R410A the protection control is activated and the compressor is stopped Discharge pressure sensor for control Pd This pressure sensor allows...

Page 149: ...39 8 8 5 Variable frequency driver VFD Items RASC 4 6 HNPE RASC 8 10 HNPE Applicable power supply 3 400V 50Hz Rated input current at 40 ºC 3 3 A 7 0 A Rated output current at 40 ºC 2 5 A 5 5 A Enclosure IP20 Range of output frequency 0 1 400 Hz Model a mm RASC 4 6 HNPE 96 RASC 8 10 HNPE 125 mm ...

Page 150: ...made by the inverter to the power supply side Terminals indicated with LOAD are connected to the inverter side and terminals indicated with LINE to the power supply side Items Specifications Model 4LFB 22930 2FB Rated current 3N 400V 27 A Permissible temperature range 25 ºC to 65 ºC Circuit diagram Load Line SA Z Line in Load out Dimensions 123 217 mm ...

Page 151: ...7 Capacitor CB1 CB2 Only for RASC 8 10 HNPE This part is used for changing the alternative current to the direct current for the inverter CB1 and CB2 3N 400V 50Hz Items Specifications Models LNX2W472MSEEHE Capacity of static electricity 4700 μF Rated voltage 400 VDC Permissible temperature range 25ºC to 85ºC mm ...

Page 152: ... 4 6 HNPE Items Specifications Characteristics 0 5 mH 10 at 1kHz Rated current 30 A Direct resistance 15 0 mΩ 20 at 20ºC Permissible temperature range 20ºC to 60ºC mm 70 max 86 60 74 37 5 56 2 0 2 0 1 0 2 0 8 8 2 Reactor for RASC 8 10 HNPE Items Specifications Characteristics 1 0 mH 10 at 1 kHz Rated current 30 A Direct resistance 27 4 mΩ 20 at 20ºC Permissible temperature range 20ºC to 60ºC mm 65...

Page 153: ...f compression 1 The gas is inhaled from the inlet port at the outer frame of the fixed scroll 2 The gas inside of the compression space is compressed toward the centre of the scroll 3 The compression space is minimum at the centre of the scroll and the gas compressed at the maximum is discharged from the outlet port of at the centre of the scroll 4 The above procedures suction compression discharg...

Page 154: ......

Page 155: ...t panel 149 9 3 8 Removing air outlet panel 150 9 3 9 Removing fan motor 151 9 3 10 Replacement of the compressor 159 9 3 11 Replacement of the pressure protection devices 162 9 3 12 Replacement of the reversing valve coil 163 9 3 13 Replacement of the expansion valve coil 164 9 3 14 Replacement of the solenoid valve coil SVA and SVC 164 9 3 15 Replacement of the reversing valve 165 9 3 16 Replace...

Page 156: ...ase them When performing brazing work besides security gloves it is a must to wear convenient eye protection NOTE The images and pictures shown in this chapter except when the contrary is indicated correspond to the RASC 4 6 HP units Processes described are equally valid to 8 10 HP models NOTE All compressors are connected by brazing Check to ensure whether there are flammable things around or not...

Page 157: ...e service cover Electrical box service cover Back service cover Stop valve protection cover Air outlet panel Air inlet panel Front side view Right side view Air outlet panel Air inlet panel Cycle service cover Stop valve protection cover Back side view Left side view Back service cover Electrical box service cover Fan service cover ...

Page 158: ...an service cover 1 Unscrew the 3 fixing screws 2 Slide the service cover upward Then pull backwards and remove it using the handle Screws 9 3 3 Removing electrical box service cover 1 Unscrew the 2 fixing screws 2 Slide the service cover upward Then pull backwards and remove it using the handle Screws 9 3 4 Removing back service cover 1 Unscrew the 3 fixing screws 2 Slide the service cover upward ...

Page 159: ... 1 Unscrew the 35 fixing screws 2 Lift the upper cover upward Then remove it and leave it away to a side carefully CAUTION Wires are attached to the upper cover by 3 clamps at the front side and 3 clamps at the back side Remember to release them before lifting the upper cover When lifting up the upper cover at least two people are required one from each side Upper cover Clamps 9 3 7 Removing air i...

Page 160: ...et panel 1 Unscrew the 3 fixing screws which attach the air outlet panel with the upper cover 2 Unscrew the 12 screws 3 for each side of the air outlet panel Screws of the upper cover Screws of the air outlet panel 3 Slide the air outlet panel upward Then pull backwards and remove it ...

Page 161: ...moving upper cover and access to the unit s internal parts from the upper side b If upper cover cannot be removed but air outlet panel can be removed remove it as described in section 9 3 8 Removing air outlet panel c If upper cover and air outlet panel cannot be removed remove the following parts Remove the fan service cover as described in section 9 3 2 Removing fan service cover Remove the back...

Page 162: ...nnection box disconnect all the wiring corresponding to the connections of the fan motor terminal Unscrew and pull cable gland to release the wiring harness NOTE Remember how the cables are connected in order to avoid possible connection problems Fan motor connection box Screws Fan motor terminal strip Screwed cable gland 3 Unscrew the fan motor support From the fan service cover unscrew the 6 scr...

Page 163: ...nits it may happens some obstruction due the electric box Then proceed to remove the electric box from the fan unit as shown in the pictures Screws Earth Screw Gently but firmly pull the motor support backwards CAUTION Mind to take care from the runner blades have cutting edges ...

Page 164: ...nternal parts from the upper side b If upper cover cannot be removed but air outlet panel can be removed remove it as described in section 9 3 8 Removing air outlet panel NOTE If RASC unit is ducted the fan duct of the installation must be removed in order to be able to unscrew the fan unit accessory from the air outlet panel c If upper cover and air outlet panel cannot be removed remove the follo...

Page 165: ...e foot NOTE There is little space to remove the fixing screws in this side Use box spanner or universal joint in order to facilitate the work Nuts NOTE Keep the two 2 washers 1 flat washer 1 spring washer of each screw to use it when reassembling 3 Remove the fan duct accessory by following these steps a From the air outlet panel remove the 8 screws of the fan duct accessory Screws b Take the fan ...

Page 166: ...accessible from the back service cover CAUTION When lifting the fan unit up at least two people are required one from each side Clamps 6 From de back service cover disconnect the electric connection of the fan motor Open the fan motor connection box 4 screws shall be loosened to remove the cover Fan motor connection box Screws ...

Page 167: ...n problems Screwed cable gland DANGER Disconnect the RASC unit from the power supply before touching any of the parts Do not touch the electrical box before disconnecting it in order to avoid an electrical shock Electrical hazard Risk of electrical shock Do not touch the electrical components when the LED1 Red located on the PCB1 is ON in order to avoid electrical shock 7 Remove the fan motor supp...

Page 168: ...units it may happens some obstruction due the electric box Then proceed to remove the electric box from the fan unit as shown in the pictures Screws Earth Screw Gently but firmly pull the motor support backwards NOTE Mind to take care from the runner blades have cutting edges ...

Page 169: ...or wires in the terminal box NOTE Make sure that the Faston terminals for the compressor are normal Any lack of grip should lead to a change of the old terminals for new ones It is recommended to clamp the fasten terminals to improve the contact Check and take note of each terminal number and indications for its correct connection at the reassembling process If wires are connected in incorrect ord...

Page 170: ...parate the blazing burner flame sufficiently from the wires and electrical components around the brazed part in order to avoid burning When replacing the compressor the brazed material used for connecting the compressor and refrigerant pipes can drop into the pipes and get sucked into the compressor causing a compressor failure To avoid this take the following points into account when replacing th...

Page 171: ...the compressor in the reverse procedure a Check if the Faton terminal has any abnormality Ensure the pull out force greater than 20 Nm If the Faston terminal is identified faulty replace it with a new one b Ensure the fixture of the lead wires c Surely fix the terminal box by tightening the closing nut tightening torque 3 0 Nm d Attach the top of sound proof cover to cover surely the compressor e ...

Page 172: ...essure sensor for discharge pressure control Pd Low pressure switch PSL 3 To remove the pressure protection devices proceed as follows High pressure switch PSH and Low pressure switch PSL a Disconnect the Faston terminals from the high pressure switch b Using a burner cut the high pressure switch from the brazing neck of discharge pipe for PSH and suction pipe for PSL Brazing part Faston terminals...

Page 173: ...moving upper cover and access to the unit s internal parts from the upper side b If upper cover cannot be removed remove the cycle service cover as described in section 9 3 1 Removing cycle service cover 2 Disconnect the PCN100 connector on the RASC PCB1 3 Remove the reversing valve coil by removing the screw fixing the coil 4 When reassembling perform the procedure in the reverse order of removin...

Page 174: ...orm the procedure in the reverse way of removing The expansion valve coil is equipped with a lock mechanism After attaching the expansion valve coil rotate it until the sound of locking is heard NOTE Fix the wires by plastic bands to the original position Electronic expansion valve coil 9 3 14 Replacement of the solenoid valve coil SVA and SVC 1 In order to access to the unit s internal parts remo...

Page 175: ...frigerant as explained in section 3 4 4 Pump down refrigerant 3 Remove the reversing valve coil according to the section 9 3 12 Replacement of the reversing valve coil 4 Remove the reversing valve assemblies from the 4 brazed parts where it is fixed Remove the brazing of the reversing valve using a blowtorch Cool down the piping side covering it with wet cloth in order to avoid brazing material en...

Page 176: ...lect the refrigerant as explained in section 3 4 4 Pump down refrigerant 3 Remove the coils according to the sections 9 3 13 Replacement of the expansion valve coil and 9 3 14 Replacement of the solenoid valve coil SVA and SVC in this chapter 4 Remove the brazing parts using a blowtorch and previously cooling the pipe side with wet cloth in order to avoid brazing material entering the reversing va...

Page 177: ... When handling the PCB s take care of components Do not apply excessive force to them in order to avoid damaging the motherboard and failures The electrical components of the electrical box are distributed in two levels upper level and lower level Upper level Lower level VFD 1 To access to the upper level remove the electrical box cover as described in section 9 3 3 Removing electrical box service...

Page 178: ...CB3 Mark Part name PCB1 3 Printed circuit boards 1 3 TB1 Terminal board Removal of PCB s PCB1 PCB3 1 Disconnect all the connectors in the PCB 2 Remove the PCB by pressing the expanded part of the 4 plastic holders using long nose pliers as shown in the picture below 3 Pull the PCB out from the PCB plate Press Press Pull up Long noise pliers PCB Plastic holder Location of plastic holders PCB1 Locat...

Page 179: ... Screws Removal of the variable frequency driver VFD 1 The control cables are located underneath the VFD cover To remove the VFD cover remove previously the network cable and then loosen the screw at the right side of the VFD Gently pull the cover backwards Screw Network cable 2 Disconnect the fan motor power cables T1 T2 T3 and the fan motor earth cable from the variable frequency driver Fan moto...

Page 180: ... SMGB0091 rev 2 11 2015 170 3 Disconnect the rest of the connected cables Main supply cables L1 L2 and L3 Alarm cables Alarm cables Main supply cables 4 Remove the VFD by unscrewing the 4 screws which fix the VFD to the plate Screws ...

Page 181: ...ical components of the PCB box directly The lower level is accessible by removing the 2 screws which fix the upper plate of the electrical box and turn it towards the front side as it has been explained at the beginning of section 9 3 17 Removal of the electrical components for 4 6 HP EF1 4 DIP IPM NF1 DCL CMF CMC Mark Part name DIP IPM Inverter PCB NF1 Noise filter DCL Reactor CMC Magnetic contac...

Page 182: ... all the connectors in the DIP IPM 2 Remove the DIP IPM by removing the 4 screws located at the top and bottom of the plastic plate that holds the DIP IPM Screws Screws Removal of the noise filter NF1 1 Disconnect all the wires connected to the noise filter NF1 2 Remove the noise filter by pressing the expanded part of the 4 plastic holders using long nose pliers as shown in the picture below 3 Pu...

Page 183: ... 4 screws fixing the DCL and remove it Screws Removal of the magnetic contactor for compressor CMC 1 Disconnect the wires connected to the CMC 2 Remove the 2 screws fixing the CMC and remove it Screws Removal of the magnetic contactor for fan CMF 1 Disconnect the wires connected to the CMF 2 Remove the 2 screws fixing the CMF and remove it Screws ...

Page 184: ...ace the fuses pulling up them from the fuse holder Power fuses Removal of the fuse holder Remove the fuse holder removing the screw There is 1 screw for each fuse holder Additionally remove the screws that fix the wiring to the fuse holder Fuses Fuse holder Fuse holder screw Screw for fuse wiring ...

Page 185: ...When handling the PCB s take care of components Do not apply excessive force to them in order to avoid damaging the motherboard and failures The electrical components of the electrical box are distributed in two levels upper level and lower level Upper level Lower level VFD 1 To access to the upper level remove the electrical box cover as described in section 9 3 3 Removing electrical box service ...

Page 186: ... 2 3 Printed circuit boards 1 2 and 3 TB1 Terminal board Removal of PCB s PCB1 PCB2 and PCB3 1 Disconnect all the connectors in the PCB 2 Remove the PCB by pressing the expanded part of the 4 plastic holders using long nose pliers as shown in the picture below 3 Pull the PCB out from the PCB plate Press Press Pull up Long noise pliers PCB Plastic holder Location of plastic holders PCB2 PCB1 Locati...

Page 187: ... Screws Removal of the variable frequency driver VFD 1 The control cables are located underneath the VFD cover To remove the VFD cover remove previously the network cable and then loosen the screw at the right side of the VFD Gently pull the cover backwards Screw Network cable 2 Disconnect the fan motor power cables T1 T2 T3 and the fan motor earth cable from the variable frequency driver Fan moto...

Page 188: ...0091 rev 2 11 2015 178 3 Disconnect the rest of the connected cables Main supply cables L1 L2 and L3 Alarm cables Alarm cables Main supply cables 4 Remove the VFD by unscrewing the 4 screws which fix the VFD to the plate Alarm connectors ...

Page 189: ...el is accessible by removing the 2 screws which fix the upper plate of the electrical box and turn it towards the front side as it has been explained at the beginning of section 9 3 18 Removal of the electrical components for 8 10 HP PCB4 IPM RS1 RS2 DCL CMC CMF EF1 4 NF1 DM R1 R2 CB1 CB2 Mark Part name PCB4 IPM Inverter power module DM Diode Module NF1 Noise filter DCL Reactor CMC Magnetic contac...

Page 190: ...os with the mark band Nos when reassembling If incorrectly connected malfunction or damage will occur Check to ensure that electrical wires will not be caught between the mounting electrical components and the mounting plates when the PCB4 is remounted Apply silicon grease evenly on the whole rear side of the transistor module when mounting Silicon grease is available as a field supplied accessory...

Page 191: ... pliers as shown in the picture below 3 Pull the noise filter plate out of the plastic holders Press Press Pull up Long noise pliers PCB Plastic holder Plastic holder Removal of the reactor DCL 1 Disconnect the wires connected with the DCL 2 Remove the 4 screws fixing the DCL and remove it Screws Removal of the magnetic contactor for compressor CMC 1 Disconnect the wires connected to the CMC 2 Rem...

Page 192: ...s have polar characters Identify the wire mark and the indication on the capacitor when reconnecting the wiring 2 Remove the 4 screws that fix the capacitor and remove it Screws CB1 CB2 Removal of the resistors R1 R2 and RS1 RS2 1 Disconnect the wires connected to the resistors 2 Remove the 1 fixing screw in order to remove the resistor NOTE Although the wirings and the fixing screw are marked onl...

Page 193: ...lace the fuses pulling them up from the fuse holder Power fuses Removal of the fuse holder Remove the fuse holder removing the screw There is 1 screw for each fuse holder Additionally remove the screws that fix the wiring to the fuse holder Fuses Fuse holder Fuse holder screw Screws for fuse wiring ...

Page 194: ......

Page 195: ...ration 196 10 2 2 Alarm codes 197 10 2 3 Troubleshooting by alarm code 199 10 3 Troubleshooting in check mode 245 10 3 1 Troubleshooting using the remote controller PC ART 245 10 3 2 Troubleshooting using the remote controller PC ARF 255 10 3 3 Troubleshooting using the 7 segment display 261 10 4 Checking procedure for main parts 267 10 4 1 Checking procedure for the control PCB PCB1 267 10 4 2 Ch...

Page 196: ...he operating line between the RASC unit and indoor units In this case 03 appears after 30 seconds c Duplication of the indoor unit number See alarm code 35 Normal case The 7 segment display of the RASC unit is not indicated Abnormal case If there is something wrong the 7 segment display of the RASC unit displays the following indications Cause Indication Remarks The indoor units are not supplied w...

Page 197: ...t of the control circuit to earth Measure the insulation resistance Remove the cause of the short circuit and replace the fuse Failure of the transformer at the indoor unit side Measure the voltage at the secondary side Replace the transformer Disconnected cable of the remote control switch Connect the cable Replace the cable or repair the cable Insufficient contacting at the connectors of the rem...

Page 198: ...use Check item Action Turn OFF the main switch RUN LED is ON and the LCD is indicated However the system does not operate For example the indoor fan the RASC fan or the compressor does not operate Failure of the indoor unit fan motor Disconnected coil Measure the coil resistance using the tester Replace the indoor unit fan motor Burnt out coil Measure the insulation resistance Failure of the RASC ...

Page 199: ...trol 01 Room thermostat cooling 02 Room thermostat heating In case that room thermostat is not used set for input signal actually used If no signal is used set at 00 NOTE 1 Refer to section Self checking procedure of the remote control switch 2 Refer to section Self checking procedure of PCB by means of the remote control switch 3 Even if the remote control switches are normal the compressor does ...

Page 200: ...nected wire of thermistor Failure of 4 way valve Disconnec ted 4 way valve coil Measure the resistance of coil Replace the 4 way valve Incorrect activation of 4 way valve Enforced power supply Disconnected control wires between indoor unit and RASC unit Check the connectors Correctly connect the wiring Failure of the RASC units of PCB Disconnected wiring to PCB Check the connectors Correctly conne...

Page 201: ... for clogging Remove the clogging Check the connection cord and the connector Replace the connector Is there an operation sound from the coil Replace the coil Is the thermistor on the compressor normal Replace the thermistor Is the thermistor installed correctly on compressor Correctly install the thermistor Clogged strainer in the indoor unit clogging at the low pressure piping Check the temp dif...

Page 202: ...refrigerant after the vacuum pumping Clogging of the discharge piping Check for clogging Remove the clogging Failure or malfunction of the expansion valve Check for clogging Remove the clogging Check the connection cord and the connector Replace the connector Is there an operation sound from the coil Replace the coil Is the thermistor on the compressor normal Replace the thermistor Is the thermist...

Page 203: ...ce the thermistor Is the thermistor installed correctly on compressor Correctly install the thermistor Clogging of IU RASC unit strainer Check the temperature difference between the inlet and the outlet of strainer Replace the strainer for the RASC unit or the indoor unit Clogging of suction piping Check the temperature difference of each part Remove the clogging Insufficient air flow through the ...

Page 204: ...he check valve Excessively high suction pressure Malfunction or internal leakage of 4 way valve Check the temperature difference at the inlet and the outlet of the 4 way valve Replace the 4 way valve Discharge temperature of the indoor unit is unstable Check the expansion valve of the indoor unit in the same system Replace the failed expansion valve of the indoor unit NOTE 1 Refer to section 3 4 1...

Page 205: ...es Watching condition for the heating process Wait for the switching of the 4 way valve 1 3 minutes If the 4 way valve does not switch check for insufficient refrigerant Indoor fan does not operate when the compressor operates Discharge pressure does not increase higher than 1 5 MPa due to the insufficient refrigerant Check the operation pressure Add the refrigerant Disconnected wiring for the ind...

Page 206: ... cycle number C Alarm code D Model code Model code Indication Model H Heat pump P Inverter F Multi SET FREE C Cooling only E Other b IVX individual operation E If there are various indoor units connected the above mentioned information is shown for each one of them Power supply failure All displays disappear If the unit stops due to a power shortage it will not start again even though the power co...

Page 207: ...power supply Incorrect wiring or insufficient capacity of power supply wiring 7 Cycle Decrease in discharge gas superheat Excessive Refrigerant Charge Failure of Thermistor Incorrect Wiring Incorrect Piping Connection Expansion Valve Locking at Opened Position Disconnected Connector or faulty RASC fan motor 8 Excessively high discharge gas temperature at the top of compressor Insufficient refriger...

Page 208: ...t sensor Incorrect wiring of current sensor Failure of control PCB or Inverter PCB 53 Inverter fin temperature increase Inverter module IPM and Inverter PCB abnormality Failure of compressor clogging of heat exchanger 54 Abnormality of inverter fin temperature Abnormal inverter fin thermistor or Heat exchanger clogged 55 Abnormality of inverter PCB Failure of inverter PCB EE Compressor Compressor ...

Page 209: ...the following item Check if float switch FS connected to the CN14 is open activated by using a tester CN14 Safety devices line scheme Phenomenon Cause Check item Action Turn OFF the main switch Activation of the float switch High Drain Level Clogging of the drainage Check the drain pan Remove the clogged foreign particles Faulty float switch Fault Check the continuity when the drain level is low R...

Page 210: ...h in the indoor unit RPK only Indication of Outdoor Unit PCB Indoor Unit number for Malfunction Alarm code Is alarm code 01 indicated on LCD or 7 segment of O U PCB Is DSW2 1P on OU PCB ON Turn OFF the power source and then turn OFF DSW2 1P on OU PCB Failure of I U PCB or disconnection of wiring between PCB1 and PCB2 Yes No Yes ...

Page 211: ...al PCB1 Is the CMC or CMF coil damaged Is the protective device still operating Yes Faulty CMC or CMF or disconnected cables No Yes No Yes If all the above checks have been overcome see the status of the following items in this order Check if some of the following devices terminals connected to the PCN8 are open activated by using a tester Activation of the float switch FS Activation of the intern...

Page 212: ... motor Check the correct rotation of the fan Remove a possible obstacle of the fan Insufficient contact or incorrect connection Check the continuity after the fan motor temperature decreases to room temp Replace the fan motor if there is no continuity Measure the resistance by means of the tester Correct looseness Replace the connectors Check the connections Repair the connections Coil damage Meas...

Page 213: ...lly low RASC fan speed during cooling mode Check the communication line between PCB1 and PCB3 CN10 X1 and between PCB3 and VFD X2 RJ45 Connect correctly the wiring if insufficient contact or replace it if damaged Check the variable frequency driver VFD Replace it if faulty Check the fan motor For RASC 6 8 10 NPE units check the optional function Setting of the fan performance curves F2 Select the ...

Page 214: ...tor or coil not well assembled Fix the looseness or reconnect the connector Fully closed and locked Replace the expansion valve Faulty gas bypass solenoid valve Check for clogging Replace the gas bypass solenoid valve Overcharged refrigerant Check the cycle operation temperature Charge the refrigerant correctly Mixture of the non condensate gas in the refrigerant cycle Check the air temperature an...

Page 215: ...the micro computer is automatically reset The alarm is displayed when the abnormal transmission is maintained for 30 seconds from the starting of the RASC unit Investigate the cause of the overcurrent and take the necessary action when the fuses are blown out or the circuit breaker for the RASC unit is activated This alarm code may be indicated when the inverter PCB and the RASC unit cannot secure...

Page 216: ...10 seconds Does refrigerant system Number setting between RU and IU correspond RU DSW4 and RSW1 IU DSW5 and RSW2 4 Is LED3 yellow on RU PCB1 flashing more than once in 10 seconds Reconnect connector CN8 red of RU PCB1 Is IU PCB setting Non pole operating 2 Set it correctly Set it correctly Failure of I U PCB RPK FSN H 3M RPC FSN3 RCIM FSN3 RCI FSN3 only Remove connector CN8 red of PCB1 1 Is there ...

Page 217: ...RSW2 4 Is LED3 yellow on RU PCB1 flashing more than once in 10 seconds Reconnect connector CN8 red of RU PCB1 Is IU PCB setting Non pole operating 2 Set it correctly Set it correctly Failure of IU PCB RPK FSN H 3M RPC FSN3 RCIM FSN3 RCI FSN3 only Remove connector CN8 red of PCB1 1 Is there 400V between phases L1 L2 L3 of the terminal board Is there 400V between phases L1 L2 L3 of the terminal boar...

Page 218: ...compressor motor Measure insulation resistance Remove cause of short circuit and replace fuse Incorrect power supply circuit of RASC unit PCB1 Check RASC unit PCB1 output 3 Replace fuse Melted fuse RS1 RS2 Faulty CB Measurement of insulation resistance Replace IPM or CB Faulty IPM Measurement of resistance between lines and insulation resistance Replace IPM or PCB2 and IPM Incorrect power supply c...

Page 219: ...cted Set the end terminal resistance to OFF when CN8 is reconnected 2 Transmission Setting SW1 Item Setting Position SW1 3 PCB1 output voltage Voltage Vcc 12 GND2 12 VDC Vcc 05 GND1 5 VDC Vcc 12 GND1 12 VDC Vcc 15 GND1 15 VDC Vcc 24 GND1 24 VDC Vcc 12T GND1 12 VDC 4 The rotary switch RSW2 is not available depending on the indoor unit model 6 Refer to section Self checking procedure of PCB by means...

Page 220: ...urce OFF Power source ON Faulty DIP IPM Faulty DIP IPM Incorrect wiring Remove the connectors PCN201 and CN201 on DIP IPM No No No No LED2 remains ON or OFF No LED2 remains ON or OFF Yes Yes Yes Yes Yes Yes Yes Remove the connector CN6 on PCB1 Power source ON Connect the connector CN6 on PCB1 Normal DIP IPM Check the wiring again Normal DIP IPM Check the wiring again Are the fuse EF1 on PCB1 and p...

Page 221: ...CN6 of PCB1 and then power ON No Yes Reconnect CN6 on PCB1 Faulty Loose wiring change of colour Normal Faulty PCB1 Replace capacitors CB1 CB2 and or resistances R1 R2 2 NOTE Investigate the cause of fuse blown Are the fuse EF1 on PCB1 and power fuses EF1 EF2 normal Is LED2 Green on PCB1 flashing Check capacitors CB1 CB2 and resistances R1 R2 1 Is wiring between CN6 on the PCB1 and CN206 on the PCB...

Page 222: ...No Correctly connect each phase of the power source Faulty PCB1 or other cause see below PCB1 is normal PCB1 is normal Is there any phase which is not connected Voltage for unit to be suspended Running voltage 342 to 456V Setting voltage Less than 323V Phenomenon Cause Check item Action Turn OFF the main switch Activation of reverse phase sensor in the RASC unit Reverse or single phase Check it ac...

Page 223: ...when frequency increase Approx 20 Hz to 60 Hz Fault magnetic contactor Replace it No No Is the power supply voltage 400V 10 Does the voltage fall during operation by operation of other apparatus Is LED201 on DIP IPM ON after magnetic contactor for compressor CMC is turned ON How is compressor operation Is connection correctly between DIP IPM reactor DCL and CMC Is the power supply voltage 323V dur...

Page 224: ...connection correctly between IPM and capacitors CB1 and DB2 DCL or CMC Is the power supply voltage 323V during operation Is the magnetic contactor for compressor CMC function properly No Yes Faulty PCB4 Replace it Yes Is DC voltage over 460V between terminals P and N of IPM Yes Check capacitors CB1 2 Replace capacitors 1 Faulty PCB4 Replace it Be careful especially because of high voltage Loose wi...

Page 225: ...ly No Replace RASC fan motor Charge correct refrigerant volume No No Repair leaks of gas Correctly charge refrigerant Check the expansion valve or remove the cause of discharge air short circuit at indoor and RASC units Is the thermistor installed correctly on the compressor Is it at cooling or heating mode when the alarm has occurred Indoor unit expansion valve opening lower than 300 pulses Yes C...

Page 226: ...ires for expansion valve control Check connections Repair wiring connections Faulty discharge gas thermistor Fault Measure resistance Replace thermistor if faulty Incorrect mounting Check mounting state See Alarm Code 08 Correctly mount thermistor Incorrect connection Check connections Remove looseness replace connector or repair connections Faulty RASC fan motor Measure coil resistance and insula...

Page 227: ... 400 600 800 1000 1200 10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Thermistor resistance characteristics Temperature ºC Thermistor resistance kΩ Limits of temperature A thermistor for the upper part temperature of the compressor is installed to prevent discharge gas from overheating If discharge gas temperature increases excessively lubricating oil deterioration occurs and lubricating properti...

Page 228: ...ty thermistor No Yes Faulty PCB Phenomenon Cause Check item Action Turn OFF the main switch Faulty air inlet thermistor Fault Check the resistance Replace the thermistor if faulty Incorrect connection Check the connection Repair the wiring and the connections Faulty PCB Replace PCB and check the operation Replace PCB if faulty NOTE This data is applicable to the following thermistors Indoor unit d...

Page 229: ...emoved Is THM2 outlet air connected to the indoor unit PCB Connect it No Yes Is the resistance of THM2 between 0 24kΩ and 840kΩ Faulty thermistor No Yes Faulty PCB Phenomenon Cause Check item Action Turn OFF the main switch Faulty air outlet thermistor Fault Check the resistance Replace the thermistor if faulty Incorrect connection Check the connection Repair the wiring and connections Faulty PCB ...

Page 230: ...removed Is THM3 freeze protection connected to the indoor unit PCB Connect it No Yes Is the resistance of THM3 between 0 24kΩ and 840kΩ Faulty thermistor No Yes Faulty PCB Phenomenon Cause Check item Action Turn OFF the main switch Faulty freeze protection thermistor Fault Check the resistance Replace the thermistor if faulty Incorrect connection Check the connection Repair the wiring and connecti...

Page 231: ...ult is removed Is THM5 gas pipe connected to I U PCB Connect it No Yes Is the resistance of THM5 between 0 24kΩ and 840kΩ Faulty thermistor No Yes Faulty PCB Phenomenon Cause Check item Action Turn OFF the main switch Faulty gas piping thermistor Fault Check the resistance Replace the thermistor if faulty Incorrect connection Check the connection Repair the wiring and connections Faulty PCB Replac...

Page 232: ... less than 0 24 kΩ or cut greater than 840 kΩ during the cooling process or the heating process The system is automatically restarted when the fault is removed Is THM4 connected to intake of PCB Connect it No Yes Is the resistance of THM4 between 0 24kΩ and 840kΩ Faulty thermistor No Yes Faulty PCB Phenomenon Cause Check item Action Turn OFF the main switch Faulty fresh outdoor air Econofresh ther...

Page 233: ...normal Check the indoor temperature If the indoor temperature is unusual take a suitable action to reduce the indoor temperature No No Does the indoor fan run Yes Is the fan motor hot No Yes Phenomenon Cause Check item Action Turn OFF the main switch Activation of the internal thermostat for the indoor unit fan motor Faulty indoor unit fan motor Measure the coil resistance and the insulation resis...

Page 234: ...2 S R L LED3 LED1 RSW2 CN6 HA CN14 CN4 CN3 CN9 CN10 IC1 DSW5 CN11 CN34 DSW4 TP ON 1 2 3 4 ON 1 2 DSW9 ON 1 2 3 4 5 6 DSW6 ON 1 2 3 4 5 6 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 ON 1 2 3 4 5 6 RSW1 DSW3 LED6 CN28 CN5 THU1 THM5 THM4 CN33 LED4 CN2 L3 EF2 THM3 THM2 THM1 CN7 CN36 CN8 REG2 L1 SW1 PCN1 TR1 LED5 DM1 T1 PCN6 PCN7 EFS1 EFR1 L5 ON 1 2 CN17 REG3 CN1 PCN4 DSW7 VCC13 VCC05 GND PC4 VCC15 CN1 LED...

Page 235: ... Measure the voltage between VCC15 and VDC 15V 10 by tester 4 Measure following check points voltages by tester Between VCC05 and GND 5V 4 Between VCC13 and GND 13 1V 10 5 Perform the operation with PCN550 on IU PCB disconnected It functions normally if if more than 1V generates between number 4 pin of PCN550 and VDC check point for approx 10 seconds after starting the operation NOT E Even if the ...

Page 236: ...ce of THM9 between 1kΩ and 6kΩ Faulty thermistor No Yes Faulty PCB Phenomenon Cause Check item Action Turn OFF Main Switch Faulty top of compressor thermistor Fault Check resistance Replace thermistor if faulty Incorrect connection Check wiring to PCB1 Repair wiring and connections Faulty PCB1 Replace PCB1 and check operation Replace PCB1 if faulty 1072 0 640 4 394 2 249 2 161 5 107 0 72 3 50 0 35...

Page 237: ...n RASC PCB1 Faulty RASC PCB1 No Yes Abnormality of high pressure sensor Yes Is voltage under 0 1V or over 4 9V between number 2 and 3 of the connector CN100 on RASC PCB1 Faulty RASC PCB1 No Phenomenon Cause Check item Action Turn OFF Main Switch Faulty top of compressor thermistor Fault Check resistance Replace thermistor if faulty Incorrect connection Check wiring to PCB1 Repair wiring and connec...

Page 238: ... between 0 24kΩ and 500kΩ Faulty thermistor No Yes Faulty PCB1 RASC 4 6 HNPE RASC 8 10 HNPE 105 4 77 9 58 2 44 0 33 6 25 9 20 2 15 8 12 5 10 0 8 0 6 5 5 3 4 3 3 6 3 0 2 5 0 20 40 60 80 100 120 20 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 Thermistor resistance characteristics Temperature ºC Thermistor resistance kΩ Phenomenon Cause Check item Action Turn OFF Main Switch Faulty thermistor for the...

Page 239: ... indicated below Is the thermistor THM8 Te connected to PCB1 Connect it No Yes Is the resistance of THM8 between 0 2kΩ and 500kΩ Faulty thermistor No Yes Faulty PCB1 RASC 4 6 HNPE RASC 8 10 HNPE 105 4 77 9 58 2 44 0 33 6 25 9 20 2 15 8 12 5 10 0 8 0 6 5 5 3 4 3 3 6 3 0 2 5 0 20 40 60 80 100 120 20 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 Thermistor resistance characteristics Temperature ºC The...

Page 240: ...Phenomenon Cause Check item Action Turn OFF Main Switch Incorrect Capacity Setting of Indoor Unit Check combination of indoor units and capacity setting on PCB Correctly set dip switch DSW3 Incorrect Capacity Setting of RASC unit Check capacity setting on RASC unit PCB Correctly set dip switch DSW3 Total Indoor Unit Capacity Connected to the RASC unit is Beyond Permissible Range Check RASC unit mo...

Page 241: ...I in the same refrigerant group exceeds 16 units In systems with indoor units compatible and not compatible with H LINK II if there is no empty space in addresses 0 15 because these numbers have already been fixed for indoor units compatible with H LINK II NOTE The alarm code may appear when H LINK system is employed for indoor RASC unit transmission if there is any incorrect setting in DSW4 RSW1 ...

Page 242: ...s 1 230V applied between PCN9 number 1 and 3 during stoppage Faulty RASC PCB1 Yes Check wiring connection except RASC PCB1 No RASC PCB1 is normal Connector number for check Connector PCN9 Pin number 1 and 3 Phenomenon Cause Check item Action Turn OFF Main Switch Faulty DIP IPM Check DIP IPM by self checking Replace DIP IPM NOTE This alarm may appear if one of the protection devices of RASC unit is...

Page 243: ...nection of RASC PCB1 Replace the electronic expansion valves if faulty Yes Yes Phenomenon Cause Check item Action Turn OFF the main switch Excessively high discharge pressure Leakage of solenoid valve SVA Check the outlet temperature of solenoid valve SVA Check connection Replace solenoid valve SVA if faulty Closed stop valve Check stop valve Open stop valve Abnormal high pressure sensor Check con...

Page 244: ...emperature thermistor Faulty RASC unit evaporating temperature thermistor Fault Check resistance Replace thermistor if faulty Incorrect connection Check wiring to PCB Repair wiring and connections Faulty PCB RASC unit Indoor unit Replace PCB and check the operation Replace PCB if faulty Excessively low suction pressure in vacuum Liquid line stop valve is not open before operation Check stop valve ...

Page 245: ...P 1 Is there any cause of instantaneous voltage decrease No No Yes Yes it trips It trips immediately It trips after a certain period Is the power supply voltage 380V 10 or 415V 10 Check the capacity and wiring of the power source Is it 340V or more during operation when other devices are operating Is the compressor running current the same as rated current Is current applying to crankcase heater I...

Page 246: ...an 1 5 A including 1 5 A Before the compressor is operated at the end of position control the current wave value is less than 5 0 A Check the inverter PCB DIP IPM Restart operation Replace the compressor How is compressor operation when restarted Is the coil resistance of compressor normal Yes No Compressor is not operated Indication P7 appears 1 Faulty inverter PCB DIP IPM Replace it 2 Compressor...

Page 247: ...e end of position control the current wave value is less than 5 0 A Is output of Inverter PCB PCB4 correct as well as the voltage between U V V W and W U Restart operation Replace the compressor How is compressor operation when restarted Is the coil resistance of compressor normal Yes No Compressor does not operate P7 is displayed 1 Faulty inverter PCB PCB4 Replace it 2 Power wiring of the comp is...

Page 248: ...ogging of the heat exchanger Compressor stops after few minutes Itc 1 Itc 21 Compressor stops immediately Itc 1 12 Yes Is the supply voltage 3N 400 V 10 Check the capacity and wiring of the power source Yes Yes Yes No No No No Is voltage higher than 340V during operation Is voltage higher than 340V at any time Is the compressor running current same as operating current Is crankcase heater ON Yes R...

Page 249: ...s high pressure increased Check pressure and refrigerant cycle Check clogging for heat exchanger Refer to the item Cause of inverter stoppage i for details Compressor stops after few minutes Itc 21 Compressor stops immediately Itc 1 12 Turn OFF power disconnect U V W from compressor terminals and restart Does the protecting function activate 3 Pass the power wires through CT Yes No Replace IPM Che...

Page 250: ...try operation is performed twice Conditions When the temperature inside the transistor module of the inverter PCB exceeds 90 C Remove clogging Is the heat exchanger of RASC unit clogged No Yes Replace DIP IPM 1 Yes Replace DIP IPM 1 No Restart operation Does it trip soon NOTE 1 Perform the high voltage discharge work by referring to the paragraph RASC 4 6 HNPE in section 10 4 2 Checking procedure ...

Page 251: ...s When the temperature of the thermistor for inverter fin exceeds 100 C Remove the clogging Is the heat exchanger of RASC unit clogged No Yes Yes No Replace the PCB4 1 Replace the thermistor Is thermistor short circuited or faulty Yes Faulty PCB4 or thermistor Replace it 1 No Restart the operation Does it trip soon NOTE 1 Perform the high voltage discharge work by referring to the paragraph RASC 8...

Page 252: ...P IPM 4 6HP or PCB4 8 10HP Turn off power LED201 on Inverter PCB is OFF and restart operation Yes Inverter PCB DIP IPM For 4 6HP and PCB4 For 8 10HP NOTE When the excessive surge current is applied to the unit due to lighting or other causes this alarm code or the cause code of inverter stoppage Itc 11 is indicated on the 7 segment display on RASC unit PCB1 and the unit can not operate In this cas...

Page 253: ...increase protection device 47 Low pressure decrease protection activating You can check these alarms using the check mode 1 Follow the action that is indicated in each alarm chart You can clear these alarms only by turning OFF the main switch to the system However pay careful attention before starting because there is a possibility of causing serious damages to the compressors Alarm code b0 Incorr...

Page 254: ...d the refrigerant cycle number from 1 to 63 Setting number for the 64th unit shall be 0 2 Unit number setting refrigerant cycle number setting starting from 0 Set the unit number and the refrigerant cycle number from 0 to 63 Setting number for the 64th unit shall be 63 The unit unit number setting and the refrigerant cycle unit number setting are set between 16 and 63 and the indoor unit does not ...

Page 255: ...ed as Unit number and alarm code displayed The alarm code that identifies the last fault that has occurred in the displayed unit The unit number of the connected unit or the unit number for which the checking mode was selected previously ADDS Number of the indoor unit in number cycle RN Number refrigerant cycle Check mode 1 Refer to Contents of the check mode 1 for details After seven seconds With...

Page 256: ... at thermistor C b3 55 Thermistor is open circuited or PCB is defective or 4 Indoor unit heat exchanger liquid pipe temperature C b4 20 Abnormal 129 Temperature for top of compressor 5 Temperature at remote sensor C b5 25 ff Thermistor is short circuited or PCB is defective or 6 RASC unit ambient temperature C b6 10 255 or 7 Indoor unit heat exchanger gas pipe temperature C b7 25 127 Temperature f...

Page 257: ...the indoor unit and the RASC unit is not performed during 3 minutes indoor units are stopped In this case stoppage is d1 06 cause and the alarm code 03 may be indicated 01 Thermo OFF float switch activation NOTE 1 02 Alarm NOTE 2 03 Freeze protection overheating protection 05 Instantaneous power failure at RASC unit NOTE 3 06 Instantaneous power failure at indoor unit NOTE 4 07 Stoppage of cooling...

Page 258: ...al FF Abnormal Compressor pressure frequency indication 20 Discharge pressure high x 0 1 MPa H1 18 21 Suction pressure low x 0 01 MPa H2 04 22 Control information H3 44 This is an indication for internal information for the remote control switch This does not have any specific meaning 23 Operation frequency Hz H4 44 This is an indication for frequency of inverter Indoor unit capacity indication Th...

Page 259: ...oor unit expansion valve opening L 20 29 RASC unit expansion valve MV opening L2 gg 30 Same as line 29 L3 gg 31 Control information L4 00 Estimated electric current indication 32 Compressor running current A P 25 The running current of the primary side of the inverter is displayed Returns to temperature indication ...

Page 260: ...emperature C 94 12 Corresponds to check mode 1 b6 5 Indoor unit heat exchanger gas pipe temperature C 95 25 Corresponds to check mode 1 b7 6 RASC unit evaporating temperature during heating C 96 03 Corresponds to check mode 1 b8 7 Control information 97 Corresponds to check mode 1 b9 8 Discharge gas temperature at the top of compressor chamber C 98 45 Corresponds to check mode 1 bA Compressor pres...

Page 261: ...tor Liquid pipe temperature thermistor Remote thermistor abnormality Gas pipe temperature thermistor Remote sensor Transmission of central station EEPROM Zero cross input failure Transmission of indoor units during this checking operation Transmission of RASC unit RASC unit PCB Internal thermostat fan input failure PSW input failure PSH protection signal detection circuit Phase detection Transmiss...

Page 262: ... not connected to the remote control switch Check the wiring between the remote control switch and the indoor unit In this troubleshooting procedure checking of the following parts of the PCB is not available PCB in indoor unit relay circuit DIP switch option circuit fan circuit protection circuit PCB in RASC unit relay circuit DIP switch option circuit If this troubleshooting is performed in the ...

Page 263: ...itches 3 The LCD changes as shown in the right figure 4 After the LCD changes as shown in the right figure the RUN indicator flickers twice 5 The LCD changes as shown below Press all the switches 13 switches one by one Every time you press the switch the number of the indication of the part A in the figure below increases one NOTE Unless all the switches are pressed the checking does not proceed t...

Page 264: ...r several seconds have passed the remote control switch is automatically activated again 10 When the remote control switch is activated again the RUN indicator is ON and the operation is started Therefore press the RUN STOP switch and stop the operation NOTE In case that the operation is not automatically started when the remote control switch is activated again the detection circuit for the momen...

Page 265: ... Display Alarm History Display Check 2 01 02 Check 1 ENT RTN SEL OK A C COOL HIGH LOUV ADJ Meeting Room MODE SPEED LOUV TEMP FLTR OK Press and hold menu and help simultaneously for 3 seconds during the normal mode Contents of the check mode 1 and 2 1 Press and hold menu and help simultaneously for 3 seconds during the normal mode The check menu is displayed Check Menu Function 5 Model Display Alar...

Page 266: ...ermo Temperature of Remote Control Switch 28 J4 Refrigerant Cycle Number 2 12 bC Not Prepared 29 L1 IU Expansion Valve 13 C1 IU Micro Computer 30 L2 RASC unit expansion valve 1 14 C2 OU Micro Computer 31 L3 RASC unit expansion valve 2 15 d1 Stopping Cause State Indication 32 L4 RASC unit expansion valve B 16 E1 Times of Abnormality 33 P1 Compressor Current 17 E2 Times of Power Failure 34 q1 Motion...

Page 267: ... History Display from the check menu and press OK 3 The alarm history display is switched by pressing or Alarm History 01 03 RTN Next Page DelAll 2008 10 28 PM02 10 01 01 22 2008 10 29 PM03 45 01 03 11 2008 11 06 AM11 37 01 02 14 2008 11 07 PM07 15 01 03 13 2008 11 07 PM11 55 01 01 29 Date Time I U ERR OK 4 To delete the alarm history press OK The confirmation screen will be displayed Select Yes a...

Page 268: ... will return to 3 Check 1 Checking Check 2 Checking Check 3 Checking I U O U PCB Check 01 01 5 After completing the check the result of PCB check will be indicated Press return and return to 3 Check 1 00 Check 2 00 Check 3 00 I U O U PCB Check 01 01 Result of check table Indoor Unit PCB RASC Unit PCB 0 Normal 0 Normal Abnormality of Inlet Air Temperature Thermistor Abnormality of Transmission of R...

Page 269: ...To clear EEPROM press and help simultaneously See EEPROM clear process 15 0 1 0 0 0 P 3400 ARF 8Y050 2008 11 06 12 34 Self Checking 4 LCD Test Press OK and the screen will be switched as shown in the figure 0 2 0 0 0 Self Checking 5 Backlight Test LCD brightness changes gradually by pressing OK 0 3 0 0 0 Self Checking 03 Backlight test 04 Contrast test 05 Run indicator test 6 Contrast Test Contras...

Page 270: ... 01 01 00 00 1 0 0 0 0 2008 01 01 00 00 Self Checking 13 EEPROM Test EEPROM Clearing Cancel Press help EEPROM Clear Press OK or wait 15 seconds EEPROM data will be cleared During the process the numbers will be indicated on where A is located If A indicates 999 EEPROM is in a faulty condition In case A indicates 999 the process does not proceed to next step 11 0 0 0 Self Checking 14 After the seve...

Page 271: ...W on the PCB in the RASC unit During checking data do not touch the electric parts except for the indicated switches because 220 240V is applied to them Pay attention not to contact the tools with electrical parts If contacted electrical parts will be damaged 1 Contents of RASC micro controller output status 8 8 Y52C Y21 FAN1 YCH PSH FAN2 Y20F Y20A 8 8 SEG1 PSW1 PSW2 PSW3 Manual defrost To start c...

Page 272: ... two digits flash Indoor unit address 15 nA 00 00 63 These items indicate the respective data for the different connected indoor units The right character of the indication represents the indoor unit setting number 1st indoor unit A 2nd indoor unit b 3rd indoor unit c 4th indoor unit d 5th indoor unit F 6th indoor unit G Indoor unit expansion valve opening 16 EA 20 00 100 In case that opening is 1...

Page 273: ...switch activation NOTE 1 02 Alarm NOTE 2 03 Freeze protection overheating protection 05 Instantaneous power failure at RASC unit NOTE 3 06 Instantaneous power failure at indoor unit NOTE 4 07 Stoppage of cooling operation due to low outdoor air temperature Stoppage of heating operation due to high outdoor air temperature 10 Demand 11 Retry due to compression ratio decrease 13 Retry due to high pre...

Page 274: ...l inverter transmission 18 04 8 Abnormal current detection 17 P7 51 9 Instantaneous power failure detection 18 11 Reset of micro computer for inverter 18 12 Earth fault detection from compressor Only starting 17 P7 53 13 Phase detection abnormality 18 16 Inverter non operation 18 p8 55 17 Communication abnormality 18 p8 55 18 Protection device activation PSH 02 19 Protection detection device abnor...

Page 275: ...High pressure increase protection Over current protection Cold draft protection b In relation to retry control the latest retrial will be indicated unless a protection control related to frequency control is indicated Priority Protection control Code 1 Pressure ratio control p1 2 High pressure increase protection p2 3 Inverter current protection p3 4 Inverter fin temperature increase prevention P4...

Page 276: ...cy decrease P5 Discharge gas temperature increase protection Temperature at the top of compressor is high frequency decrease Maximum temperature is different depending on the frequency Temperature at the top of compressor 112 ºC Indicate P5 P9 High pressure decrease protection Discharge pressure of compressor decrease under 1 0 MPa Frequency increase Cooling operation and lowest step fan or heatin...

Page 277: ...power circuit 1 230V is applied to P1 and VDC 2 1 Yes Yes Yes LED1 Red is turned ON DC5V system is normal DC13V is applied between VCC12 and GND1 1 DC12V system is normal DC15V is applied between VCC15 1 and VCD 2 1 DC280V system is normal AC5V is applied between VCC05 and GND1 1 Voltage is normal LED1 is faulty Failure of DC Power Circuit of RASC PCB Failure of DC Power Circuit of RASC PCB Failur...

Page 278: ...ester Otherwise it may cause a failure of the RASC unit PCB and the circuit tester When measuring the voltage with a circuit tester the setting of the circuit tester shall be set within the DC voltage measurement range If the setting is not correct it may cause a failure of the RASC unit PCB and circuit tester Position of the check points in the RASC Unit Printed Circuit Board PCB1 LED3 SEG1 LED2 ...

Page 279: ...o ensure that no voltage is charged DIP IPM Connecting wires Electrical soldering iron Plug Inverter module checking procedure Rectifier circuit of inverter PCB Remove all the terminals of the inverter PCB before checking Non faulty if 1 8 are checked and satisfied Measure with 1 kΩ range of a tester Internal circuit of rectified part of DIP IPM R S T 52C 㧙 1 Touch of the tester to DIP IPM 52C ter...

Page 280: ...t with specified terminals to measure Tester ACT circuit of inverter PCB Non faulty if 9 13 are checked and satisfied Measure with 1 kΩ range of a tester Internal circuit of ACT part of inverter module External Appearance and Internal Circuit of Transistor Module 9 Check items 1 8 10 Touch of the tester to DIP IPM DCL2 terminal and to P of ISPM DIP IPM soldered part to measure the resistance Norma...

Page 281: ... IPM and the side of tester to DCL1 DIP IPM measure the resistance If the resistance is around 500Ω it is normal If the resistance is 0Ω or infinity Ω it is abnormal Contact with specified terminals to measure Tester Checking method of fuse for DIP IPM protection EF331 Measure the resistance under 1 kΩ range of a circuit tester By placing the and side of tester to EF331 on DIP IPM measure the resi...

Page 282: ... wires Transistor module Transistor module checking procedure Outer Appearance and Internal Circuit of Transistor Module 1 Drive circuit 2 Overheating protection circuit 3 Sensor 1 1 1 1 1 1 1 2 3 Procedure Remove all the terminals of the transistor module before check If items 1 4 are performed and the results are satisfactory the transistor module is normal Measure it under 1kΩ range of a tester...

Page 283: ...le and the side of tester to the terminals A of the diode module measure the resistance If all the resistances are from 5 to 50kΩ it is normal 2 By touching the side of the tester to the terminal of diode module and the side of tester to the terminals A of the diode module measure the resistance If all the resistances are greater than 500kΩ it is normal 3 By touching the side of the tester to the ...

Page 284: ...ity NOTE It is not recommended to check tension PN Power source x 2 PC CN is nearly equal to PN 2 Checking R1 and R2 1 If the value is different Capacitor could be damaged by overload 04 06 alarm could be displayed if low supply voltage is present 2 R1 6 3 kΩ R2 10 5 kΩ If these values are different the capacitors are not properly charged Checking RS1 and RS2 between A and B 250 Ω white resistance...

Page 285: ...ure the fan motor resistance Measurement procedure 1 Ensure that the fan motor connector CN35 has been correctly disconnected as explained above 2 Connect the tester between each pair of wires of the fan motor and measure if the coil resistance values are close to the normal values in the table below Results Normal Observed values are close to the normal values in the table below Faulty Observed v...

Page 286: ...Electronic expansion valve Freeze protection thermistor It is abnormal if the liquid pipe pressure does not increase and the outlet temperature of the expansion valve decreases after the pump down process starts Locked with fully open It is abnormal under the following conditions after the heating process for more than 30 minutes the discharge gas temperature of the compressor is not 10 C higher t...

Page 287: ...eversing valve ON Reversing valve OFF NOTE The values may differ depending on testers Appropriate output voltage is 70 339VDC Test lead side pin 1 pin 3 Test lead side pin 3 pin 1 Range of voltage 325 VDC 163 VDC Actions of 4 way solenoid valve Monostable solenoid operation type Operation Mode Heating Reversing Valve Coil ON Operation Mode Cooling Reversing Valve Coil OFF Electric Current Applied ...

Page 288: ...sition is kept by magnetic force with no current applied When current is applied to the reversing valve coil an electromagnetic force headed in the direction opposite to the magnetic force is generated and the valve is turned OFF by their separation force After the valve is turned OFF the plunger position is kept by spring force Coil Attractor Plunger Plunger position Coil case Magnetic screw Spri...

Page 289: ...rsing valve relay is turned OFF no current is applied 4 way solenoid valve coil Separation resistance Separation resistance Switch relay ON Cooling Heating Switch relay OFF Cooling Heating 4 way solenoid valve coil Reversing valve relay ON Reversing valve relay ON Time Chart Heating operation Cooling operation or Defrost operation Heating operation 4 way solenoid valve SW1 is turned ON for a secon...

Page 290: ...s expansion valve MV1 correctly connected Check to ensure that MV1 to CN5A is correctly connected 8 Is expansion valve coil MV1 correctly connected Check to ensure that each coil is correctly mounted on the valve 9 Are the refrigeration cycle and electrical wiring system incorrectly connected Check to ensure that refrigerant is flowing into indoor units by operating one refrigerating cycle only fr...

Page 291: ...curs the output electrical wave becomes unstable giving stress to the motor winding resulting in winding insulation failure 7 8 During a cooling operation SH is controlled by MV of each indoor units During a heating operation Td is controlled by MV1 If expansion valves are incorrectly connected correct control is not available resulting in compressor seizure depending on liquid refrigerant returni...

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Page 293: ...g is applied 285 11 1 4 Abnormally high operation sound in the ceiling type indoor unit 285 11 1 5 Alarm code 31 286 11 1 6 Not cooling well due to insufficient installation space for the RASC unit 286 11 2 Maintenance work 287 11 3 Service and maintenance record 288 11 4 Service and maintenance record using the 7 segment display 289 11 5 Service and maintenance record by remote control switch 291...

Page 294: ...ge Question and answer for the field work Example 1 Burnt out compressor due to an insufficient refrigerant charge Phenomenon After commissioning the alarm code 08 sometimes occurred and the compressors were burnt out after operating for two months Cause The refrigerant piping work was performed during the summer season The additional refrigerant was not sufficiently charged from the discharge gas...

Page 295: ...ountermeasure The setting of the DSW2 was changed Remarks Pay special attention to the size of liquid pipe Refer to 3 3 Refrigerant piping range for details 11 1 4 Abnormally high operation sound in the ceiling type indoor unit Question and answer for the field work Example 3 Abnormally high operation sound in the ceiling type indoor unit Phenomenon The operation sound at the HIGH speed was abnorm...

Page 296: ...the indoor units to be always ON or to install the Hitachi Multitenant building connection board PC AMTB 11 1 6 Not cooling well due to insufficient installation space for the RASC unit Question and answer for the field work Example 5 Not cooling well due to insufficient installation space for RASC unit or inlet outlet air bypass Phenomenon Cooling operation was well performed through the intermed...

Page 297: ...he refrigerant leakage at the piping connection between the RASC and the indoor unit 4 Cabinet Stain Check for any stain and remove it cleaning if it is the case Fixing screw Check for any loosened screw or any lost screw Fix the loosened screws and the lost screws Insulation material Check for any peeled thermal insulator on the cabinet Repair the thermal insulator 5 Electrical equipment Activati...

Page 298: ...ay valve ditto Good Not good 17 Check for a leakage in the check valve ditto Good Not good 18 Check for a leakage in the accumulator ditto Good Not good 19 Check for a leakage in the strainer ditto Good Not good 20 Check for a leakage in the electronic expansion valve ditto Good Not good 21 Check for a leakage in the piping ditto Good Not good 22 Check the direction of the fans By viewing the airf...

Page 299: ...E Ambient air temperature To Cause of stoppage at inverter iT Inverter secondary current A2 Indoor unit address Unit number 1 nA Indoor unit expansion valve opening EA Liquid pipe temperature of indoor unit Freeze protection LA Indoor unit intake air temperature iA Indoor unit discharge air temperature oA Cause of indoor unit stoppage dA Indoor unit address Unit number 2 nb Indoor unit expansion v...

Page 300: ...F Indoor unit intake air temperature iF Indoor unit discharge air temperature oF Cause of indoor unit stoppage dF Indoor unit address Unit number 6 nG Indoor unit expansion valve opening EG Liquid pipe temperature of indoor unit Freeze protection LG Indoor unit intake air temperature iG Indoor unit discharge air temperature oG Cause of indoor unit stoppage dG FAN1 FAN2 Fan unit 52C CMC PSH High pr...

Page 301: ...perature of remote control switch bb C Micro computer state indication Indoor unit micro computer C1 RASC unit micro computer C2 D Stopping cause state indication Stopping cause state indication d1 E Alarm occurrence Times of abnormality E1 Times of power failure E2 Times of abnormal transmitting E3 Times of inverter tripping E4 F Automatic louvre state Louvre sensor state F1 H Pressure frequency ...

Page 302: ...heck valve is broken 9 Check for a leakage of the check valve on the discharge gas side DSW4 4 enforced stoppage of the compressor ON so that the compressor will not run although the running command is sent from the remote control switch Check that variation of Ps on the RASC unit PCB is 17 seconds Make sure that the Ps increase is within 0 03 MPa in two minutes after the Ps increase at the stoppa...

Page 303: ...ent of the compressor Make sure that you follow the instructions 14 Perform the vacuum from the check joint of the low pressure side If you collect the refrigerant only on the low pressure side A in 11 You cannot perform the vacuum of the refrigerant from the check joint of the high pressure side 15 Open the liquid stop valve and the gas stop valve completely when you finish the vacuum 16 Make sur...

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Page 306: ...the standard ISO 14001 of JACO Japan for its Environmental Management accordance with the standard Hitachi Air Conditioning Products Europe S A U is certified with ISO 9001 of AENOR Spain for its Quality Management accordance with the standard ISO 14001 of AENOR Spain for its Environmental Management systems accordance with the standard Hitachi certifies that our products have met EU consumer safe...

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