Sanyo AHX0752 Service Manual Download Page 6

Page: 6 / 142

- 1

W-2WAY ECO-i SYSTEM

Control Functions

Contents

1. CONTROL FUNCTIONS

1. Introduction

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-2

2. Selecting Outdoor Unit for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-3

3. Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-4

4. Special

Controls

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-9

5. Other

Controls

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-14

6. Operation of Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-15

7. Outdoor Unit Electronic Thermostatic Expansion Valves [MOV1, MOV2 & MOV4] . . . 1

-17

8. Outdoor Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-19

9. Demand

Control

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-20

10. Indoor Unit Control of the Electronic Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . 1

-21

11. Rap Valve Kit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-23

12. Indoor Unit Refrigerant Oil Self Recovery Control . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-24

13. Discharge Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-25

14. Current Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-26

15. Pressure Sensor Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-27

16. Backup Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-28

17. Service Maintenance Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-30

18. Other Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

-32

Summary of Contents for AHX0752

Page 1: ... Semi Concealed Concealed Duct Type Slim Concealed Duct Type Concealed Duct High Static Pressure Ceiling Mounted Wall Mounted Type Floor Standing Type Concealed Floor Standing Type UMHX0762 UHX0762 AHX0752 UHX0962 AHX0952 UMHX0962 KHX0752 KHX0952 FHX0762 FHX0962 FMHX0962 FMHX0762 KHX1252 UMHX1262 UHX1262 XHX1252 XMHX1252 AHX1252 UHX1562 UMHX1562 THX1252 UMHX1862 UHX1862 XHX1852 KHX1962 KHX1862 THX...

Page 2: ...source it can cause the generation of poisonous gas IMPORTANT For safe installation and trouble free operation you must Pay close attention to all warning and caution notices given in this manual This symbol refers to a hazard or unsafe practice which can result in severe personal injury or death WARNING CAUTION If Necessary Get Help These instructions are all you need for most installation sites ...

Page 3: ...serva tion by curtailing heat and carrying power etc Most importantly the multi air conditioner system is able to replenish a large amount of refrigerant compared to conventional individual air conditioners If a single unit of the multi air conditioner system is to be installed in a small room select a suitable model and installation pro cedure so that if the refrigerant accidentally leaks out its...

Page 4: ...18 Other Functions 1 32 Section 2 OUTDOOR UNIT REPAIR PROCEDURES 2 1 1 Removing Panels 2 2 2 Removing Electrical Component Box and Duct 2 3 3 Discharging Compressor Oil 2 5 4 Backup Operation 2 6 5 Recovering Refrigerant 2 9 6 Checking for Leakage After Repair 2 14 7 Evacuating System 2 15 8 Charging Compressor Oil 2 16 9 Pumping Out Refrigerant from Outdoor Unit 2 20 10 Compressor 2 23 11 High an...

Page 5: ... Display 5 2 2 Outdoor Unit Control Panel LED Display 5 4 3 Remote Controller Servicing Functions 5 5 4 W 2WAY ECO i Alarm Codes 5 7 5 Blinking Inspection Display on the Remote Controller 5 27 6 Inspection of Parts 5 28 7 Test Pin 5 29 8 Thermister Characteristics Curve 5 30 iv ...

Page 6: ...utdoor Unit Electronic Thermostatic Expansion Valves MOV1 MOV2 MOV4 1 17 8 Outdoor Fan Control 1 19 9 Demand Control 1 20 10 Indoor Unit Control of the Electronic Control Valve 1 21 11 Rap Valve Kit Control 1 23 12 Indoor Unit Refrigerant Oil Self Recovery Control 1 24 13 Discharge Temperature 1 25 14 Current Protection 1 26 15 Pressure Sensor Failure 1 27 16 Backup Operation 1 28 17 Service Maint...

Page 7: ...ntire system As a result the system will not operate if no outdoor unit has been set as unit No 1 Required settings for Test Run Outdoor unit No 2 Unit No 2 Unit No 1 1 3 units 1 40 units System 1 30 This system can be expanded to connect a maximum of 3 outdoor units The max system capacity shall be within 24 Ton The CCU functions are disabled at all units except the unit that is set as unit No 1 ...

Page 8: ... inverter compressor ordinarily there is no absolute order of priority for compressor operation Therefore there is no order of priority for the outdoor units However it is possible to operate the outdoor units in sequence beginning with unit No 1 by using the outdoor unit maintenance remote controller to change the outdoor unit EEPROM settings For information concerning EEPROM settings refer to th...

Page 9: ...nverter compressors will stop at a time when the outdoor is stopped accordingly Constant speed compressors run in order of the shortest amount of operating time In heating mode the inverter compressor with the shortest amount of operating time runs at first followed by the compressors in order of the shortest amount of operating time including inverter units Suppose the following tentative system ...

Page 10: ...g mode is not used for the condensation temperature detection because it may indi cate the temperature of superheated gas 3 3 Compressor Capacity Control The compressor operating conditions vary depending on the indoor unit operating conditions and the effects of indoor heat load outdoor temperature and other factors Unit No 1 CCU calculates the required capacity accord ing to these operating cond...

Page 11: ...ted Area A Area AB Area B Area C 60 8 53 6 51 8 45 5 41 0 35 6 Maximum requirement level L 0 15 30 For indoor units that are operating in Cooling Mode if one unit is selected for a test run mode the room temper ature control by the set temperature cannot be performed Areas B and C are assumed to be area A for control purposes instead By this reason the compressor continues its operation regardless...

Page 12: ... 0 5 horsepower No control The values shown in the table above are reduced to the values calculated by roadmap control Condensation Temperature Tc Control Control of Indoor Units Operating either in Cooling Mode or Heating Mode 3 6 2 118 5 118 4 116 6 116 4 113 0 112 8 Horsepower decrease Area D Area C Area B Area AB Area A 118 4 116 6 30 15 0 98 6 100 4 109 4 107 6 If the condensation temperature...

Page 13: ...compressor is performed by self protection in the inverter circuit and does not increase or decrease the compressor capacity 16 5A 13 5A 13 0A 12 5A 12 0A 90Hz 80Hz Primary current Secondary current Inverter compressors stop HIC auto protection Inverter compressors stop When 100ms is detected current protection works Control Hz decrease in the inverter compressor Prohibit Hz increase in the invert...

Page 14: ...tion during heating start as well as for oil recovery 4 2 System Refrigerant Oil Recovery Control 4 2 1 System refrigerant oil recovery cycle 4 2 2 Start of System Refrigerant Oil Recovery Control When the compressor has stopped because the oil level is 0 a count is added to the alarm counter The counter for this compressor is not cleared unless the oil level for that compressor reaches 2 or else ...

Page 15: ... units operate at 480 pulse Valve kits at all indoor units operate in Heating mode ON status Fan operates at the set fan speed stops or operates at a very low speed Expansion Valve Electronic Thermostat RAP valve kit Fan Indoor units 4 3 Defrost Control This system uses the following 2 defrosting systems System employs Defrost control method Reverse cycle defrost Outdoor unit cycle defrost 1 outdo...

Page 16: ...etection A Frost detection does not occur for 5 minutes after operation starts B Frost is detected when either condition 1 or 2 below is met External temperature F The frost detection area is located under the thick lines Even if the total time has not reached 35 minutes if there is 1 or more outdoor units that fulfills the defrost detec tion conditions all operating outdoor units perform defrost ...

Page 17: ...e way Because the amount of time that the unit operates as an evaporator is very short there is little danger of frost forming again quickly Rather because the heat source is very powerful it is possible to shorten the defrost operating time Defrost sequence Outdoor unit cycle defrost is always completed in 2 defrost operations A When there are 2 outdoor units Defrost outdoor unit outdoor unit Eva...

Page 18: ...e is any other outdoor unit where the defrost end condition has not been met defrost control continues for all outdoor units and system defrost control is not ended Condition 2 The maximum defrost time listed in the table above has elapsed 4 3 8 System defrost end When all outdoor units where defrost control is in effect have met the defrost end conditions defrost control is ended for the system 1...

Page 19: ...the oil level which is necessary and sufficient for normal operation There is no problem Confirm that oil is returned after performing the oil control operation Confirm that oil level is recovered to the required level after performing the oil recovery control between systems At the time immediately after the oil level changes from 2 to 1 there is a specified amount of oil in the compressor Namely...

Page 20: ...he system The OFF conditions take priority over the ON conditions for this valve This valve is OFF when the outdoor unit is stopped This valve is ON when special control is in progress This valve turns ON when symptoms of insufficient refrigerant gas occur at an indoor unit This valve turns ON when the outdoor air temperature is 59 F or below Under these conditions the high pressure is low and ref...

Page 21: ...a constant speed compressor starts This valve turns ON for 120 seconds after defrost control ends This valve turns ON for 10 seconds after the outdoor unit stops This valve remains OFF at all times other than A through F above 6 4 Bypass Valve BPV This valve flushes the oil from the balance tubes In addition it is used for recovering refrigerant from stopped out door units during cooling operation...

Page 22: ... as shown in the figure below MOV3 is excluded Heat exchanger 2 Operation of Electronic Thermostatic Expansion Valve during normal unit operation If any one compressor in the outdoor unit is operating the outdoor heat exchanger coil is used In cooling operation all the inverter compressors are designed to operate therefore all the outdoor heat exchangers in the outdoor units will be used SH contro...

Page 23: ...tion when discharge temperature is high When the discharge temperature increases the SC circuit electronic thermostatic expansion valve opens to 480 pulses to cool down the compressor This operation takes priority over operation intended to increase SC It is performed at top priority in all operating modes In addition the valve opening adjustment will be made when the discharge temperature falls G...

Page 24: ...ode The fan mode may be decreased when symptoms of insufficient refrigerant gas are detected at an indoor unit 2 When all indoor units are operating in heating mode The fan mode may be increased when the outdoor liquid temperature drops to 44 F or below 8 5 Snow Removal Control When the outdoor air temperature is 50 F or below the fan operates for 30 seconds every 2 hours in fan mode 8 even when t...

Page 25: ...e field application func tions Control Demand meaning Operates to maximum capacity No control Operates to the upper limit for the rated current Operates to 70 of the upper limit for the rated current Always in stop condition Demand setting Contact 1 Contact 2 Input present Input not present The rated current indicates the current value that is listed in the catalog or similar material 1 20 9 Deman...

Page 26: ...t pulses ranging from 55 to 80 Liquid refrigerant is gradually returned to the outdoor unit at pulses ranging from 55 to 80 Liquid refrigerant is gradually returned to the outdoor unit at pulses ranging from 55 to 80 Performs SC distribution control within the range of 55 480 pulses The SC target value is controlled so that the high pressure saturated temp E1 becomes between 10 F to 40 F depending...

Page 27: ...Stopped Fan Thermostat ON Thermostat OFF All indoor units All indoor units Fixed pulse for cooling according to indoor unit capacity 250 Cooling control according to indoor unit capacity Cooling control according to indoor unit capacity Fixed pulse for heating according to indoor unit capacity Heating control according to indoor unit capacity However position is 20 pulses for Type D 60 pulses 60 p...

Page 28: ...as tube valve kit is connected operations of gas tube valve kit and indoor unit electronic thermostatic expansion valve are as shown in the table Stopped Fan Cooling Heating Superheat control 65 480 20 pulses Superheat control 50 480 OFF OFF OFF OFF Thermostat Thermostat Thermostat Thermostat OFF ON OFF 1 23 W 2WAY ECO i SYSTEM Control Functions 11 Rap Valve Kit Control ...

Page 29: ...pansion valve is opened regularly for 1 to 2 min utes regularly at an interval of once every 2 hours During the thermostat ON the indoor unit electronic thermostatic expansion valve is opened about 10 pulses from the current status 1 24 12 Indoor Unit Refrigerant Oil Self Recovery Control W 2WAY ECO i SYSTEM Control Functions ...

Page 30: ...ystem has been stopped for 60 minutes In this case possible causes include sensor failure and compressor overheating caused by an insufficient level of refrigerant The alarm also occurs if the sensor temperature is at or above the abnormal temperature 176 F when 20 min utes have passed after the compressor stopped In this case it is possible that the discharge temperature from a different outdoor ...

Page 31: ...rs when missing phase or overcurrent 48 A is detected at inverter compressor start the alarm at frequencies below 25 Hz Occurs when HIC detects overcurrent 75 A or when an abnormal high temperature 302 F is reached Compressor 2 23 1 27 3 Outdoor unit type Constant speed compressor Overload current A Lock current A Compressor No Compressor 2 Detected current Alarm display Overcurrent Lock current H...

Page 32: ...short circuit or poor connection to the PCB in the high pressure sensor circuit Low pressure sensor failure Alarms are emitted when the low pressure sensor becomes an electrical open circuit or a short circuit condi tions and a broken wiring short circuit or poor connection to the PCB in the low pressure sensor circuit Alarm display High pressure sensor failure Low pressure sensor failure F16 F17 ...

Page 33: ... When multiple outdoor units are installed When automatic backup mode is engaged the outdoor unit where the above alarm occurred stops operating However if one or more of the compressors is able to operate then this outdoor unit operates only when the operation of all outdoor units is required for special control such as 4 way valve adjustment or other system purposes 4 Alarm display If a wired re...

Page 34: ... When the PCB of the main unit is normal by implementing the above settings while leaving the communica tion lines between indoor and outdoor units as they are backup operation of units are possible In this case the outdoor unit that backed up all compressors is not identified as an outdoor unit however it can work as the command controller S010 switch OFF OFF OFF ON ON A Compressor 1 backup S010 ...

Page 35: ...ation frequency the capacity will be somewhat reduced Normal operation setting at time of factory shipment Noise reduced by approx 1 2 dB from the catalog value Noise reduced by approx 2 3 dB from the catalog value Noise reduced by approx 5 dB from the catalog value Approx 0 5 hp Approx 1 2 hp Approx 1 8 hp 0 0 1 2 3 The drain pump operates for 20 minutes at 20 minute intervals The drain pump oper...

Page 36: ... 0 at the time of shipment With this setting compressors with lower operating time are started first in order to balance the compressor operating times 17 8 Demand Value Setting Outdoor EEPROM 1A 1B set at outdoor units that include CCU functions Setting Operation Setting No Compatible static pressure psi Speed Demand setting Demand meaning Control No output setting at time of factory shipment Ref...

Page 37: ...tdoor units in the case of linked systems It is therefore unnecessary to install and wire multiple snowfall sensors Sensor input not present Control is performed Setting at time of factory shipment Sensor input present Control is performed Sensor input not present Control is not performed Sensor input present Control is not performed Setting Operation 1 Snow fall sensor settings 2 Control operatio...

Page 38: ... OFF unless an alarm or other event has occurred Automatic cancel General Guidelines for Insufficient Gas and Overcharge Symptoms of insufficient gas Symptoms of overcharge There is an indoor unit where the position of the electronic control valve is much higher open by 300 pulses or more than it was at start and the difference E3 E1 at that indoor unit is large 30 F or more There is an outdoor un...

Page 39: ... MEMO 1 34 ...

Page 40: ...Component Box and Duct 2 3 3 Discharging Compressor Oil 2 5 4 Backup Operation 2 6 5 Recovering Refrigerant 2 9 6 Checking for Leakage After Repair 2 14 7 Evacuating System 2 15 8 Charging Compressor Oil 2 16 9 Pumping Out Refrigerant from Outdoor Unit 2 20 10 Compressor 2 23 11 High and Low Pressure Sensors 2 35 12 Replacing 4 way Valve 2 36 ...

Page 41: ...e After Repair 7 Evacuating System 8 Charging Compressor Oil 9 Pumping Out Refrigerant from Outdoor Unit when repairing parts other than compressor 10 Compressor 11 High and Low Pressure Sensors 12 Replacing the 4 way Valve 1 Front panel removal Fig 1 Remove the front panel remove 11 screws 2 Power outlet panel valve cover removal Fig 2 Remove the power outlet panel remove 2 screws Remove the tubi...

Page 42: ... connected to the sec ondary terminals of the magnetic contactor for the compressor 5 Remove the electrical component box remove 2 screws Fig 4 Be sure to release the locking mechanism before disconnecting each connector 6 Remove the center duct Fig 5 The center duct is fitted into the upper and lower ducts and held in place by the electrical component box an arrangement that makes possible indepe...

Page 43: ...g Electrical Component Box and Duct W 2WAY ECO i SYSTEM Outdoor Unit Repair Procedures 7 Remove the lower duct remove 2 screws and a hook 8 Remove the upper duct remove 3 screws Fig 7 Lower duct Upper duct Fig 6 Fig 7 ...

Page 44: ...efrigerant in the outdoor unit following the procedures in 5 Recovering Refrigerant Remove the compressor and discharge the oil in it Refer to 10 Compressor for detailed procedures 3 3 Checking the Oil Acceptance rejection criteria for the oil It is difficult to measure the total acid value in the field therefore oil hue and odor are the rule of thumb Checking for carbon deposits and abrasive meta...

Page 45: ...ng power of all the outdoor units If the power is not reset on the control PCB of the No 1 outdoor unit main unit backup mode operation will continue after the repairs are completed Backup operation is intended as emergency operation until repairs are made Have repairs made as soon as pos sible 4 2 Manual Backup This backup operation is the conventional method of backup operation It involves disco...

Page 46: ...er to adjust the amount of refrigerant in the system After adjusting the amount of refrigerant close the gas tube valve at the failed outdoor unit Collecting refrigerant in the failed outdoor unit Short circuit the vacuum application pin CN102 on the control PCB of the failed outdoor unit where the service valves are closed then turn the power ON Also disconnect the wiring between the outdoor unit...

Page 47: ...tting the failed compressor not to operate Backup operation settings for each compressor INV compressor AC1 compressor Setting for backup operation OK Failed DIP switch S010 Turn BACK UP and AC1 ON Failed OK DIP switch S010 Turn BACK UP and INV ON Failed Failed DIP switch S010 Turn BACK UP INV and AC1 ON ...

Page 48: ...ld gauge valves refrigerant recovery unit and recovery cylinder using hoses To avoid the entry of air into the refrigerant tubing carry out this connection work carefully Fig 9 For detailed procedures such as connecting the refrigerant recovery unit with the recovery cylinder and methods used for recovery follow the specific instructions that came with the refrigerant recovery unit 5 Locate the AP...

Page 49: ...the tubing CAUTION START 5 2 1 Cooling operation for all units Ball valve is provided in the indoor unit Turn off all equipment in system Replace or repair faulty unit Check for leakage in repaired unit Evacuate air from repaired unit Ready for operation END Charge refrigerant in repaired unit Amount of charge should equal that recovered by refrigerant recovery unit Charge refrigerant in repaired ...

Page 50: ... with a service port has been provided in the indoor unit as shown in Fig 10 follow the instructions given in 2 through 6 below If the service port is instead located in the outdoor side follow the instructions in 5 2 3 Refrigerant recovery procedures 2 2 After running the unit in Cooling mode for about 5 minutes as described in 5 2 1 Cooling operation for all units fully close the liquid tube bal...

Page 51: ...all outdoor units stop operating Be sure that you do NOT grasp the lead wire when pulling out the con nector Removing any other connector may not cause the units to stop Therefore be sure to pull out the SCT connector only It is not necessary to recover the refrigerant from the balance tube Therefore do not operate the balance tube valve Turn off power to all equipment in the system Then pull out ...

Page 52: ...alves on any outdoor unit Fig 11 Remaining refrigerant may cause internal pressure Check that each valve on the manifold gauge valves is tightly closed The connection port uses a Schrader type push to release valve 5 Connect the manifold gauge valves refrigerant recovery unit and refrigerant recovery cylinder Quickly connect each part to prevent air from entering the tubing 6 Check that each servi...

Page 53: ...o the repaired part such as a newly brazed part and briefly inspect for any leakage If there are any leaks bubbles will show on the tubing surface To continue the air tight check after the brief leak inspection turn on power while short circuiting the AP pins Again feed nitrogen gas to obtain a system pressure of 72 5 psi Then measure both the outdoor ambient temperature and the pressure in the sy...

Page 54: ...outdoor control PCB By short circuiting the AP pins and turning on power to the outdoor unit all elec tronic valves in the outdoor unit are forcibly opened and any remaining nitrogen gas can be recovered Failure to perform this procedure may result in nitrogen gas remaining in the refrigerant circuit and causing operating problems Therefore never skip this step 5 Turn the power ON at the outdoor u...

Page 55: ... avoid releasing refrigerant into the atmosphere DPR 623 081 7937 Nipple Packless valve Receiver tank 638 015 2988 Perform oil charging work carefully so that no liquid refrigerant enters the charging tank CAUTION 1 Evacuation drying in oil charging tank With the lower side valve fully closed open the upper side valve and connect it to the vacuum pump via the manifold gauge valves as shown below R...

Page 56: ... to the low pressure outlet with Schrader type push to release valve in the outdoor unit to be oil charged and then connect the high pressure outlet with push to release valve to the upper valve via the manifold gauge valves at Hi pressure gauge side In addition connect the gas tube service port with push to release valve to the DPR Discharge Pressure Regulator Carry out the connection work quickl...

Page 57: ...cting hoses Perform these procedures quickly and securely so that no air can enter After charge the necessary amount of new refrigerant by referring to the Installation Instructions that came with the outdoor unit To determine the completion of refrigerant recovery follow the instructions that came with the refrigerant recovery unit 8 2 If Outdoor Unit Has Not Been Charged with Refrigerant When a ...

Page 58: ...essor 0 55 gal rated oil amount 0 026 gal If the result is a negative amount remaining oil in the removed compressor is less than the rated amount it is not necessary to discharge the extra oil from the system For the method used for additional oil charging after compressor replacement refer to 8 1 If Refrigerant Has Already Been Charged to Outdoor Unit Model name Compressor model Q ty Pre charged...

Page 59: ...ts Press and hold the CHECK button for 4 seconds or longer 4 Use the outdoor unit maintenance remote controller to check the operating status of the indoor units Check that all units are operating in Heating mode For details concerning operation of the outdoor unit maintenance remote controller refer to the Outdoor unit maintenance remote controller item It is also possible to check the operating ...

Page 60: ...p operation by recovering the refrigerant from the outdoor unit to be repaired Measure the weight of the refrigerant and cylinder itself beforehand and provide sufficient safety measures such as installing a high pressure cutout in the circuit The hoses may be subject to internal pressure from the refrigerant inside the out door unit Check that the manifold gauge valves are fully closed beforehand...

Page 61: ...y close the gas tube valve on the outdoor unit to be repaired 10 Connect the high pressure gauge side of the manifold gauge to the high pressure outlet port on the outdoor unit to be repaired and connect the manifold gauge to the refrigerant recovery device Be sure that no air enters the tubing at this time 11 Open both Hi and Lo side valves on the manifold gauge valves and recover the refrigerant...

Page 62: ...etween the electrified and non electrified parts a Motor Min 300 M b Compressor Min 100 M servicing part c Unit Min 10 M This is due to the presence of refrigerant which decreases the insulation resistance Minimum insulation resistance as required by generally accepted requirements is 1 M Reference Symptoms of motor burning 1 Ground fault results in breaker operation 2 Short circuit results in dif...

Page 63: ...en charging with the same amount of new refrigerant has not been completed but no more refrigerant will enter the unit fully close the high pressure gauge valve on the manifold gauge Next turn the power OFF at the repaired outdoor unit then remove the short circuit at the AP pin CN102 Finally fully open all valves on the gas tube liquid tube and balance tube However leave the balance tube fully cl...

Page 64: ... valve on the manifold gauge Next turn the power OFF at the repaired outdoor unit then remove the short circuit at the AP pin CN102 Finally fully open all valves on the gas tube liquid tube and balance tube However leave the balance tube fully closed if only a single outdoor unit is installed 7 If backup operation was engaged follow the instructions in 4 Backup Operation and perform backup opera t...

Page 65: ...t been completed but no more refriger ant will enter the unit first turn the power OFF at the repaired outdoor unit then remove the short circuit at the AP pin CN102 Then fully open all valves on the gas tube liquid tube and balance tube However leave the balance tube fully closed if only a single outdoor unit is installed 8 If backup operation was engaged follow the instructions in 4 Backup Opera...

Page 66: ...ce port Schrader type valve of all outdoor units where dry cores will be attached then recover the refrigerant from the tubing Be sure that no air enters the tubing at this time When the hose is connected internal pressure is applied by the remaining refriger ant in the inter unit tubing The connection port employs a Schrader type valve To determine when refrigerant recovery is compete follow the ...

Page 67: ...erform pump down of the refrigerant from all indoor units and inter unit tubing to the outdoor unit side 2 Cut the liquid narrow tube at all outdoor units where dry cores will be attached then attach the dry cores and ball valves as shown in Fig 21 3 Fig 21 Balance tube Normal unit Liquid tube service valve Outdoor unit Cleaning dry core Dry core bidirectional for R410A refrigerant Ball valve Liqu...

Page 68: ...essors For all types 90 and 140 follow the replacement procedure below A Replacing the inverter compressor Compressor 1 on remote controller alarm display Remove the crankcase heater Remove the 3 bolts and remove the washers and rubber washers quantities indicated in the figure below Disconnect the tube with flare nut using two adjustable wrenches At this time cover the tube in place with waste cl...

Page 69: ...ve the flare nut from the new compressor and connect the tube with flare nut Shape the tubes and insert them at the 2 brazing locations Connect a manifold gauge to the high and low pressure outlet ports at the outdoor unit where the compres sor was replaced Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement Perform copper brazing at the 2 brazing locations Follo...

Page 70: ...ts at the outdoor unit where the compres sor will be replaced Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement Remove the cap at the compressor terminal plate Disconnect the power terminal Remove the crankcase heater Remove the bolts 3 locations washers and spacers 1 each at the 3 locations shown in the figure The compressor rear leg is not anchored Prepare to...

Page 71: ... at back side each 1 piece Remove the 2 brazed tube caps 2 pieces from the compressor Remove hexagonal caps from the compressor When removing the hexagonal caps hold the fixing nut at the main unit side so as not to loose it with a wrench or spanner And then loosen and remove the hexagonal cap Remove the oil equalizer tube connector parts along with the O ring from the removed compressor and mount...

Page 72: ...e high and low pressure outlet ports at the outdoor unit where the compres sor was replaced Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement Perform copper brazing at the 3 brazing locations In the same way as during removal pay particular attention to protection of the oil equalizing tube connector parts shown in the figure 28 An O ring is mounted inside the ...

Page 73: ... B Replacing constant speed compressor and remove the compressors There is no predetermined sequence for removal any compressor may be removed first Installation Follow the instructions in A Replacing the inverter compressor B Replacing constant speed compressor and install the compressors There is no predetermined sequence for installation any compressor may be installed first ...

Page 74: ...from the outdoor unit where the high pressure sensor will be removed Disconnect the high low pressure sensor connector socket 3P BLK WHT from terminals CN009 and CN024 on the outdoor unit control PCB of the outdoor unit where the high low pressure sensor will be removed Use 2 adjustable wrenches in combination to remove the high low pressure sensors When removing the high low pressure sensors inte...

Page 75: ...2 1 When the replacement is available from the right side of the unit Remove the front panel of the outdoor unit then remove the right side panel of the unit Follow the instructions in 9 Pumping Out Refrigerant from Outdoor Unit recover the refrigerant of the out door unit where the 4 way valve is located Protect the check valves as shown in the figure 30 4 way valve Check valve After replacing th...

Page 76: ...ct the manifold gauge to the high and low pressure outlet ports at the outdoor unit where the 4 way valve will be replaced Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement Prepare the brazing kit to disconnect the brazed parts 4 locations Protect the check valves as shown in the figure 31 Check valve 4 way valve After replacing the 4 way valve follow the instr...

Page 77: ... MEMO 2 38 ...

Page 78: ...enance Remote Controller Contents 3 OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1 Overview 3 2 2 Functions 3 3 3 Ordinary Display Controls and Functions 3 4 4 Monitoring Operations 3 9 5 Outdoor Unit Alarm History Monitor 3 11 6 Mode Settings 3 12 ...

Page 79: ...the indoor unit connection status number of units operating mode etc NOTE Outdoor unit maintenance remote controller does not function as an ordinary remote controller It is therefore only used for test runs and during servicing L The special service checker wiring is required in order to connect the outdoor unit maintenance remote controller to the outdoor unit PCB L Ordinary remote controllers o...

Page 80: ...m details display No of indoor outdoor units Unit Nos of connected indoor outdoor units Indoor outdoor unit operating status blinks when an alarm occurs Indoor unit thermostat ON Display of individual outdoor unit alarms Total operating time of outdoor unit compressors Oil level of the outdoor unit oil sensor Total outdoor unit power ON time Outdoor unit microcomputer version other information N T...

Page 81: ...ons line in the inter unit control wiring is connected it can be left as is L In case of an independent outdoor unit 1 maintenance remote controller connected to 1 outdoor unit automatic address setting for indoor units not completed both setting mode 1 and setting mode 2 can be used L The overall system status for that refrigerant system is displayed Special service checker wiring PCB connector 3...

Page 82: ...ration The display indicates the operating mode of the indoor unit with the lowest unit No L All units test run Fig 2 Operation The CHECK button can be used to start and stop a test run for all indoor units Press and hold for 4 seconds to turn ON During the test run TEST is displayed The status of test runs performed from the indoor unit remote controller is not displayed on the outdoor unit maint...

Page 83: ...ssor 7 segment display Compressor 1 operating time 0 99999999 hrs Compressor 2 operating time 0 99999999 hrs Compressor 3 operating time Compressor 1 oil level 0 Empty 1 Insufﬁcient 2 Sufﬁcient Compressor 2 oil level 0 Empty 1 Insufﬁcient 2 Sufﬁcient Compressor 3 oil level Outdoor unit power ON time 0 99999999 hrs Compressor 1 operation count 0 65535 times Compressor 2 operation count 0 65535 time...

Page 84: ...b bus address which is currently selected XX Outdoor system address on main bus line 1 30 YY Outdoor unit sub bus address 1 8 1 appears when there is only 1 outdoor unit LED 1 2 3 Locations where and are displayed as shown in Fig 3 01 No of connected indoor units 4 units connected Sample displays 02 Unit Nos 1 2 3 and 4 are connected Fig 3 Fig 4 Fig 5 ...

Page 85: ...its before 10 seconds have passed press the FLAP button N The total compressor operating time is displayed in 1 hour units using 8 digits When the ﬁrst 4 digits are displayed the top dot of the colon is illuminated Figure A When the last 4 digits are displayed the colon dot is OFF Figure B The display of the ﬁrst 4 digits and last 4 digits changes automatically after 10 seconds The display can als...

Page 86: ...ring temperature monitoring is illuminates The display and operations are the same as for monitor mode using the indoor unit remote controller Press the button and select the indoor unit to monitor Press the temperature setting and buttons and select the item code of the temperature to monitor The unit No of the selected indoor unit and the temperature data are displayed To end monitoring press th...

Page 87: ... pressure sensor temp F Heat exchanger gas 1 F Heat exchanger liquid 1 F Heat exchanger gas 2 F Heat exchanger liquid 2 F Outdoor air temp F Not used Inverter primary current A CT2 A Outdoor unit MOV1 pulse STEP MOV2 pulse STEP Discharge temp 3 F CT3 A MOV3 pulse STEP MOV4 pulse STEP Heat exchanger gas 3 F Heat exchanger liquid 3 F Low pressure sensor temp F Suction temp F Oil 1 F Oil 2 F Oil 3 F ...

Page 88: ...display shows the outdoor unit address Press the button and select the outdoor unit for which to monitor the alarm history Press the temperature setting and buttons and select the item code for the alarm history The select outdoor unit address the item code and the alarm history alarm data are displayed The outdoor unit address is displayed as R C XX YY System XX Outdoor unit system address R C XX...

Page 89: ...st 4 digits Fig A and the last 4 digits Fig B When the first 4 digits are displayed the top dot of the colon is illuminated To exit the setting mode press the CHECK button 1 2 3 5 5 3 1 2 A and B are displayed alternately Example shows display of 0000 0001 A Display of ﬁrst 4 digits B Display of last 4 digits DN Parameter Description Snowfall sensor usage 0 Sensor input not present Control is perf...

Page 90: ...blinking The display shows the set outdoor unit address System XX YY System XX System address YY Address at outdoor unit sub bus item code number DN value in the table below and the setting data 8 digits The setting data is displayed in 8 digits The display changes between the first 4 digits Fig A and the last 4 digits Fig B When the first 4 digits are displayed the top point of the colon is lit T...

Page 91: ... MEMO 3 14 ...

Page 92: ...4 4 1 W 2WAY ECO i SYSTEM Remote Controller Functions Contents 4 REMOTE CONTROLLER FUNCTIONS 1 Simple Settings Function 4 2 2 Detailed Settings Function 4 4 3 Remote Controller Servicing Functions 4 15 ...

Page 93: ... data are displayed blinking on the remote controller LCD display Fig 1 At this time the indoor unit fan or all indoor unit fans in the case of group control begins operating If group control is in effect press the button and select the address unit No of the indoor unit to set At this time the fan at the indoor unit begins operating If unit No is displayed the same setting will be made for all in...

Page 94: ...0001 MED LO 0002 LO LO 0004 MED 1 min LO 3 min MED 0005 MED MED 0006 LO MED Heating intake temperature shift 0000 No shift 0001 Shifts intake temperature 2 F down 0002 Shifts intake temperature 4 F down 0003 Shifts intake temperature 6 F down 0004 Shifts intake temperature 8 F down 0005 Shifts intake temperature 10 F down 0006 Shifts intake temperature 12 F down Electric heater installation 0000 N...

Page 95: ...onger unit No or in the case of group control item code and settings data are displayed blinking on the remote controller LCD display Fig 2 At this time the indoor unit fan or all indoor unit fans in the case of group control begins operating If group control is in effect press the button and select the address unit No of the indoor unit to set At this time the fan at the indoor unit begins operat...

Page 96: ...e 15 112 Type 36 36 Type 12 0009 56 Type 18 19 0011 71 Type 24 For FHX2462 and FMHX2462 Except FHX2462 FMHX2462 Type 0018 160 Type 54 Unit No 1 Unit No 2 Unit No 3 Unit No 3 Unit No 2 Unit No 1 Not set Unit No 30 Unit No 64 Not set Individual 1 1 Indoor unit with no group wiring Main unit One of the group control indoor units Sub unit All group control indoor units except for main unit Not set Shi...

Page 97: ...shipment 0017 62 F Lower limit 0029 84 F 0030 86 F Upper limit at shipment Upper limit Drying 0018 64 F Lower limit at shipment 0019 66 F Lower limit 0029 84 F 0030 86 F Upper limit at shipment Upper limit Auto heat cool 0017 62 F Lower limit at shipment 0018 64 F Lower limit 0026 78 F 0027 80 F Upper limit at shipment Humidiﬁer operation 0000 Normal 0001 Ignore heat exchanger temperature conditio...

Page 98: ... control to prevent cold air 0013 Control temperature 55 F 0014 Control temperature 57 F 0025 Control temperature 77 F 0026 Control temperature 78 F Fan output switching 0000 Output linked with fan ON when indoor unit fan is operating 0001 Fan mode operation output Drain pump delayed start time 0000 No delayed start 0001 1 sec delayed start 0002 2 sec delayed start 0058 58 sec delayed start 0059 5...

Page 99: ...ing use High ceiling setting 2 with standard panel For low static pressure ﬁlter Antibacterial high performance ﬁlter 90 Antibacterial high performance ﬁlter 65 Air cleaning unit air cleaning unit optical regenerative deodorizing ﬁlter deodorant activated charcoal ﬁlter For air blocking material For 3 way discharge when discharge duct is connected 0006 For air blocking material For 2 way discharge...

Page 100: ...differential switch 0000 1 Way Air Discharge Semi Concealed A 75 2500 1250 0001 4 Way Air Discharge Mini Semi Concealed X XM 2500 1250 5000 2500 2500 1250 0005 Slim Concealed Duct U UM 1250 5000 2500 2500 1250 5000 2500 0006 Concealed Duct High Static Pressure D 1250 2500 1250 5000 2500 0007 Ceiling Mounted T 2500 1250 2500 1250 0008 Wall Mounted K 150 75 0010 Floor Standing F 150 75 0011 Conceale...

Page 101: ...ng mode from a specific remote controller When there are multiple remote controllers in the same refrigerant system it is possible to set one remote controller as the priority remote controller the remote controller which is given priority for selecting the operating mode If 2 or more remote controllers are set as priority remote controllers an alarm will occur at the remote controllers and operat...

Page 102: ... when the heating thermostat is OFF 06 Heating intake temperature shift Shifts the intake temperature during heating Can be set when the body thermostat is used 07 Electric heater installation Set when cost distribution is performed using an AMY central control system or similar system and when an optional electric heater is installed This is unrelated to control of the electric heater 08 Humidify...

Page 103: ...in increments of 5 minutes 1b Forced thermostat ON time Use this setting to change the time for forced operation at installation or servicing from 5 minutes to 4 minutes Enabled only with PAC i models 1C Cooling discharge temperature shift Shifts the set value for models which perform discharge temperature control Discharge temperature control models Floor discharge wall built in direct expansion ...

Page 104: ...the T10 terminal is used for OFF reminder or for ﬁre prevention input 31 Ventilation fan operation from remote controller It is possible to install a total heat exchanger and ventilation fan in the system which can be started and stopped by the wired remote controller The ventilation fan can operate linked with the start and stop of the indoor unit or can be operated even when the indoor unit is s...

Page 105: ...tion mode Changes ﬂap operation to draft reduction mode 46 DC ﬂap swing mode Selects the swing operation mode for the ﬂap 5d DC fan tap setting Sets the DC fan tap according to the purpose of use Change the settings data at the same time 5E Humidiﬁer ON time Sets the humidiﬁer output ON time for when the humidiﬁer is operating ON OFF control is performed during humidiﬁer operation This setting the...

Page 106: ...Press and hold the and buttons for 4 seconds or longer Simple settings Filter life time operating mode priority central control address and other settings Press and hold the and buttons for 4 seconds or longer When settings are made from a remote controller the indoor unit where that remote controller is connected stops Detailed settings System address indoor unit address central control address a...

Page 107: ...tions Test Run Function Operates the unit with the thermostat forced ON Procedure Press and hold the button for 4 seconds or longer Test appears on the remote controller LCD display Fig 3 Start operation Press the button to return to normal remote controller display Fig 3 2 3 1 4 RCS TM80BG ...

Page 108: ...sor to monitor For the relationships between the sensor addresses and sensor types refer to the table of temperature sensors and addresses on the next page If group control is in effect press the button to select the unit to monitor Press the temperature setting buttons to select the item code to change Press the button to return to normal remote controller display 1 3 4 5 2 Display shows a discha...

Page 109: ... 1 Unit No 2 0A 2A Discharge temp 1 0B 2B Discharge temp 2 0C 2C High pressure sensor temp 0D 2D Heat exchanger gas 1 0E 2E Heat exchanger liquid 1 0F 2F Heat exchanger gas 2 10 30 Heat exchanger liquid 2 11 31 Outdoor air temp 12 32 13 33 For inspection 14 34 CT2 15 35 For inspection 16 36 For inspection 17 37 18 38 19 39 For inspection 1A 3A For inspection 1B 3B 1C 3C 1D 3D Low pressure sensor t...

Page 110: ...ontroller Switch Alarm Display 5 2 2 Outdoor Unit Control Panel LED Display 5 4 3 Remote Controller Servicing Functions 5 5 4 W 2WAY ECO i Alarm Codes 5 7 5 Blinking Inspection Display on the Remote Controller 5 27 6 Inspection of Parts 5 28 7 Test Pin 5 29 8 Thermister Characteristic Curve 5 30 ...

Page 111: ...al communication signal from sub indoor units E18 During auto address setting number of connected units does not correspond to number set Number of connected indoor units is less than the number set E15 Number of connected indoor units is more than the number set E16 No indoor unit is connected during auto address setting E20 Main outdoor unit is detecting error signal from sub outdoor unit E24 Du...

Page 112: ...r start failure Missing phase or lock alarm P29 Failure of nonvolatile memory IC EEPROM on indoor unit control PCB F29 Failure of nonvolatile memory IC EEPROM on outdoor unit control PCB F31 Protective device Overload current detected Compressor 2 constant speed H11 Lock current detected Compressor 2 constant speed H12 No current detected when compressor was ON Compressor 1 INV H03 Compressor 2 co...

Page 113: ...address setting was completed successfully After the power is turned ON and automatic address setting is not in progress the number of detected indoor units connected to that system matches the number that was set and regular communications are occurring Both OFF Automatic address setting is in progress Blinking alternately At time of automatic address setting the number of indoor units did not ma...

Page 114: ...r temperature See figure at right Press the temperature setting and buttons to change the item code to the sensor address of the sensor you wish to monitor For the relationship between the sensor address and sensor type refer to the sensor temperature relationship table on next page If group control is in effect press the button to change to the unit you wish to monitor Press the CHECK button to r...

Page 115: ...ke temperature Indoor unit heat exchanger temperature E1 Indoor unit electronic expansion valve position Indoor unit heat exchanger temperature E3 Outdoor unit Unit No 1 Unit No 2 Unit No 1 Unit No 2 Discharge temperature 1 Outside air temperature Discharge temperature 2 CT2 High pressure sensor temperature Low pressure sensor temperature Heat exchanger gas 1 Detected reservoir tank temp Heat exch...

Page 116: ...or trouble at outdoor heat exchanger 1 In 5 13 F07 Liquid temperature sensor trouble at outdoor heat exchanger 1 Out 5 13 F08 Outdoor air temperature sensor trouble 5 14 F12 Compressor intake temperature sensor trouble 5 14 F16 High pressure sensor trouble 5 15 F17 Low pressure sensor trouble 5 16 F23 Gas temperature sensor trouble at outdoor heat exchanger 2 In 5 13 F24 Liquid temperature sensor ...

Page 117: ... phase or missing phase detected 5 24 P16 Compressor 1 INV overcurrent alarm 5 25 P17 Compressor 2 discharge temperature trouble 5 23 P22 Fan motor trouble 5 25 P26 Inverter compressor high frequency overcurrent alarm 5 26 P29 Inverter compressor missing phase or lock alarm 5 26 Blinking Inspection Display on the remote controller CHECK blinking 1 5 26 CHECK blinking 2 5 27 ...

Page 118: ...ddress setting was started when automatic address setting was in progress at another outdoor unit in the same link Probable cause Automatic address setting is in progress at another outdoor unit Check This alarm is not displayed on the remote controller Therefore check the blinking on the outdoor unit PCB Correction Wait for automatic address setting to be completed at the outdoor unit where it is...

Page 119: ...ditions When automatic address setting was performed no indoor units were recognized Probable cause 1 The inter unit control wiring from the outdoor unit to the indoor units has been cut 2 Serial connector 1 CN001 is disconnected at the outdoor unit 3 The power is OFF at all indoor units in the system Check 1 Check whether the inter unit control wiring from the outdoor unit to the indoor units is ...

Page 120: ...trol wiring is cut Check 1 Check the outdoor unit quantity setting again 2 Check the outdoor unit main sub control wiring Correction 1 Correct the incorrect outdoor unit quantity setting 2 Repair the outdoor unit main sub control wiring Example Notes Recovery from this alarm occurs automatically when the set outdoor unit quantity matches the number of outdoor units detected on the outdoor unit mai...

Page 121: ...mperature at times ﬂuctuates suddenly and wildly In some cases the precise temperature may not be known even when monitoring software is used Check Wiggle the sensor and check whether the trouble continues Check whether the connector is partially disconnected from the PCB An F04 alarm will not result if the connector is completely disconnected circuit is open If the cause is still uncertain check ...

Page 122: ...in continuous detection of a high discharge temperature then the compressor may stop for no apparent reason The purpose of this alarm is to facilitate identiﬁcation of the problem in this case F06 F23 Alarm Alarm code F06 F23 Alarm meaning Gas temperature sensor trouble at outdoor heat exchanger 1 Gas temperature sensor trouble at outdoor heat exchanger 2 Alarm conditions 1 A D step is 10 steps or...

Page 123: ...e a remote controller monitor or PC monitor to check the temperature that is recognized by the microcomputer Correction Example Notes F12 Alarm Alarm code F12 Alarm meaning Compressor intake temperature sensor trouble Alarm conditions 1 A D step is 10 steps or less short circuit 2 A D step is 1014 steps or more open circuit Probable cause 1 Sensor malfunction including connector 2 PCB malfunction ...

Page 124: ...r large deviation of the gauge pressure During heating check whether the temperature is lower than the highest indoor unit E1 temperature The pressure detected by the high pressure sensor is the highest pressure in the system Therefore during heating the converted saturation temperature will never be lower than any indoor unit E1 temperature During cooling this temperature will never be lower than...

Page 125: ...300 pulses or more and the E1 temperature is close to room temperature However be aware that this kind of data results often when there is a height difference between indoor units Reducing the amount of refrigerant will improve the refrigerant ﬂow however reducing it too much will increase the likelihood of alarms related to low oil level scroll side the low pressure SW and discharge temperature U...

Page 126: ...where the CT circuit is connected Check voltage and current 3 Missing power phase Trouble This alarm primarily occurs when the T phase is missing When the R phase or S phase is missing CT trouble or PCB continuity trouble occur However this may not be true in the case of a missing phase caused by magnet SW trouble Check There is the possiblility of a magnet SW failure Therefore check the phase vol...

Page 127: ...rument Correction 1 Replace the CT circuit 2 Replace the outdoor unit PCB 3 Correct the problem Example 1 The connector was not inserted after the PCB was replaced Notes Use a normal CT as a tool to determine whether the trouble is a PCB failure or CT failure H15 Alarm Alarm code H15 Alarm meaning Compressor 1 discharge temperature sensor disconnected Compressor 2 discharge temperature sensor disc...

Page 128: ...he circuit A lower high pressure level results in a smaller difference between low pressure and high pressure that may be insufﬁcient to cause refrigerant ﬂow 3 The refrigerant circuit has become closed and refrigerant has not returned to the compressor In some cases when moisture enters the refrigerant circuit it can freeze at the low pressure locations and the resulting ice can block the circuit...

Page 129: ...refrigerant circuit clogging or valve leakage at the stopped outdoor unit 5 A valve ORVR BALV BPB in the oil circuit has malfunctioned or there is clogging of the circuit capillaries which returns oil from the oil separator to the compressor 6 If an excessive amount or liquid returns to the compressor oil foaming may increase oil discharge The same occurs when the refrigerant proportion in the com...

Page 130: ...arm Alarm conditions This alarm occurs when the microcomputer identiﬁes a trouble signal indicating abnormal HIC temperature or other trouble from the HIC The HIC judges the current and temperature and outputs the trouble signal In general this indicates trouble with the HIC itself Probable cause Overcurrent in HIC circuit and the resultant abnormal heating caused by HIC failure Check Check the po...

Page 131: ...t the capacity in the outdoor unit EEPROM L17 Alarm Alarm code L17 Alarm meaning Outdoor unit model mismatch Alarm conditions This alarm occurs when a unit other than a R410A refrigerant model is connected Probable cause 1 A unit that uses R407C refrigerant or a R22 model unit was connected by mistake 2 The connected unit is correct however the refrigerant type setting in the outdoor unit EEPROM i...

Page 132: ...uid valve turns ON the discharge temperature of the other compressor decreases 5 Accumulation of refrigerant in stopped outdoor units Trouble System is OK when all outdoor units are operating however symptoms of insufﬁcient gas occur when a certain outdoor unit is stopped Condensation or frost is visible up to the top of the accumulator of the stopped outdoor unit After an outdoor unit stops there...

Page 133: ...rmally unless the temperature around the outdoor unit is excessively high 5 During cooling check for outdoor fan failure Check whether the screws securing the fan are loose and whether the fan connector in the outdoor unit PCB is properly connected 6 During heating check whether the air ﬁlters in the indoor unit are clogged If clogged clean the ﬁlters 7 During heating check whether an air short bl...

Page 134: ...ble by limiting the maximum frequency Example Notes P22 Alarm Alarm code P22 Alarm meaning Fan motor trouble Alarm conditions Fan motor start failure fan motor Hall IC input failure Probable cause Possible causes are a Hall IC input circuit failure and a fan HIC failure Check Check the fan motor wiring the Hall IC wiring and the connector connections If the wiring and connectors are normal then ch...

Page 135: ...of the PCB and the ground If the voltage is not within 2 3 V then the DCCT has malfunctioned CAUTION Currently the blinking inspection display can be displayed only on the wired remote controller and system remote controller Blinking inspection display 1 Automatic backup Alarm code Blinking inspection display Alarm meaning Automatic backup is in progress A C units can be operated Status The compre...

Page 136: ...dary side contacts remain together The conditions of magnet SW operation are poor difﬁcult to open When a magnet SW is used in a DC circuit it may be difﬁcult for the SW to open at times In an AC circuit the magnet SW should open instantaneously as long as the current is within the allowable range However this kind of trouble can occur if excessive current ﬂows and may prevent the SW from opening ...

Page 137: ...V2 Measure the voltage between plug pin 5 and pins 1 through 4 at the CN016 connector 6P RED on the outdoor unit control PCB Because of the pulse output a simplified measurement method is used Set the tester to the 12 V range if the value displayed is approximately 4 V then the voltage is normal When the voltage is normal measure the resistance between each pair of pins on the electronic control v...

Page 138: ... then turn the power back ON Output is performed in the sequence shown in the table below for 0 5 seconds each Output Operation Output Operation 1 Relay RY024 4 way valve 205 11 Relay RY012 Save valve SAVE 2 12 3 13 Relay RY003 Crank case 2 CH2 4 14 Relay RY002 Crank case 1 CH1 5 Relay RY005 Bypass valve BPV 6 Relay RY007 Recovery valve ORVR 7 8 9 Relay RY017 Refrigerant balance valve RBV 10 Relay...

Page 139: ...ndoor heat exch coil sensor E1 E3 40 35 30 25 20 15 10 5 0 20 15 10 5 0 5 10 15 20 8 7 6 5 4 3 2 1 0 20 30 40 50 60 Indoor Heat Exchanger temperature sensor E1 E3 10 15 20 25 30 35 40 45 50 55 10 9 8 7 6 5 4 3 1 2 Temperature sensor Resistance Resistance Resistance Temperature C Temperature C Temperature C ...

Page 140: ...ensor Outdoor heat exch coil sensor C1 C2 40 35 30 25 20 15 10 5 0 20 15 10 5 0 5 10 15 20 Outdoor temperature Suction gas temperature TS sensor Heat exchanger temperature Heat exchanger temperature sensor 8 7 6 5 4 3 2 1 0 20 30 40 50 60 Resistance Resistance 80 90 100 110 125 130 7 6 5 4 3 1 2 Discharge gas temp sensor Resistance Temperature C Temperature C Temperature C ...

Page 141: ... MEMO 5 32 ...

Page 142: ...om Parts Service hvac sci sanyo com United States SCS HVAC Solutions Web www SanyoHVAC com Parts hvac parts sna sanyo com Service hvac service sna sanyo com For Parts or Service Assistance please contact your local Sanyo HVAC Contractor or Distributor ...

Search results

Summary of Contents for AHX0752

Reviews:

Related manuals for AHX0752

Brands by name

Popular brands

Sanyo AHX0752, Service Manual

Search results

Summary of Contents for AHX0752

Reviews:

Related manuals for AHX0752

Brands by name

Popular brands