Mitsubishi Electric PCH-2.5GKHA Page 1 Service Manual Download

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TECHNICAL & SERVICE MANUAL

SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS

CONTENTS

1. FEATURES ···········································3

2. PART NAMES AND FUNCTIONS ········7

3. SPECIFICATIONS·································8

4. DATA ···················································11

5. OUTLINES AND DIMENSIONS··········15

6. WIRING DIAGRAM·····························20

7. REFRIGERANT SYSTEM DIAGRAM ······21

8. OPERATION FLOW-CHART ··············22

9. MICROPROCESSOR CONTROL·······26

10. TROUBLESHOOTING ························49

11. DISASSEMBLY PROCEDURE ···········57

12. PARTS LIST ········································62

13. OPTIONAL PARTS ·····························73

Indoor unit

PCH-2GKHA

PCH-2.5GKHA

PCH-3GKHA

PCH-4GKHSA

PCH-5GKHSA

PCH-6GKHSA

No. OC135

1997

[Models names]

[Service Ref.]

This  manual  does  not  cover  the
following  outdoor  units.        When
serving  them,  please  refer  to  the
service  manual  No.OC128  and
this manual in a set.
[Service Ref.]
PUH-2VKA

PUH-2.5VKA

PUH-3VKA

PUH-3YKA

PUH-4YKSA

PUH-5YKSA

PUH-6YKSA

INDOOR UNIT

Ceiling Suspended

Series PCH

REMOTE CONTROLLER

The Slim Line.
From Mitsubishi Electric.

FILTER

CHECK MODE

TEST RUN

Summary of Contents for PCH-2.5GKHA

Page 1: ...ONAL PARTS 73 Indoor unit PCH 2GKHA PCH 2GKHA1 PCH 2 5GKHA PCH 2 5GKHA1 PCH 3GKHA PCH 3GKHA1 PCH 4GKHSA PCH 4GKHSA1 PCH 5GKHSA PCH 5GKHSA1 PCH 6GKHSA PCH 6GKHSA1 No OC135 1997 Models names Service Ref This manual does not cover the following outdoor units When serving them please refer to the service manual No OC128 and this manual in a set Service Ref PUH 2VKA2 PUH 2 5VKA2 PUH 3VKA2 PUH 3YKA2 PUH...

Page 2: ......

Page 3: ...units Setting range Cooler 19 C to 30 C Heater 17 C to 28 C TEMP button This model name of the remote controller is indicated 1 FEATURES 1 ADVANCED REMOTE CONTROLLER Indoor unit Ceiling Suspended Series PCH Remote controller FILTER CHECK MODE TEST RUN w Rating Conditions JIS B 8616 Cooling Indoor 27 80 o F DB 19 66 o F WB Outdoor 35 95 o F DB 24 75o F WB Heating Indoor 20 68 o F DB Outdoor 7 45 o ...

Page 4: ... from the time the sleep operation starts until the heating air is discharged DEFROST display This indicates when the defrost operation is performed CHECK display This indicates when a malfunction has occurred in the unit which should be checked display The current time start time and stop time can be displayed in tensecond intervals by pressing the time switch button The start time or stop time i...

Page 5: ...nsion fixture without removing the installation parts off Only the side cover is removed This method is much simpler than the One time installation method 5 IMPROVING EFFICIENCY OF PIPING WORK 1 Removed the knockout work by separating the piping space from the air outlet for efficiency of the piping work w Knockout work is needed for the top part When optional drain up machine is installed the ref...

Page 6: ... FILTER High performance filter can be purchaced optionally for the special needs Auto vane Swing Locations Appropriate filter Capability Filter life Maintenance How to attach to the unit Busy shops etc Regular office shops High performance filter Standard longlife filter 2500 hour 2500 hour The filter can be used again after cleaning The filter can be used again after cleaning Remove the standard...

Page 7: ...de vanes Change the direction of airflow from the horizontal blower Long life fillter Removes dust and foreigh matter from air coming in through the grille Recommended cleaning interval Approx every 2 500 operating hours Up down guide vanes Change the direction of airflow from the vartical blower ...

Page 8: ...2GKHA1 PCH 2 5GKHA1 Cooling 18 400 5 400 2 30 0 10 0 43 1 20 0 10 1 50 0 43 6 21 1 20 6 98 0 13 0 55 1 27 0 13 2 23 0 55 9 30 1 27 10 02 Heating 21 200 25 900 6 200 7 600 2 32 3 72 Cooling 23 900 7 000 2 59 Heating 24 200 31 400 7 100 9 200 2 36 4 46 PCH 2GKHA1 Single phase 50Hz 220 240V Munsell 0 70Y 8 59 0 97 Plate fin coil PCH 2 5GKHA1 Sirocco direct 2 0 054 10 13 353 459 Sirocco direct 3 0 07 ...

Page 9: ...0 13 2 23 0 55 9 30 1 27 10 02 0 16 0 70 1 48 0 16 2 86 0 70 11 95 1 48 12 73 Heating 29 000 36 200 8 500 10 600 3 07 5 17 Cooling 34 100 10 000 3 36 Heating 35 700 44 900 10 450 13 150 3 35 6 05 PCH 3GKHA1 Single phase 50Hz 220 240V Munsell 0 70Y 8 59 0 97 Plate fin coil Sirocco direct 3 PCH 4GKHSA1 0 07 14 18 494 635 0 09 20 25 706 883 0 direct blow 2 1 210 8 1 4 270 10 5 8 2 7 Remote controller...

Page 10: ...CFM Pa mmAq kW mm in mm in Liquid Gas PCH 5GKHSA1 PCH 6GKHSA1 Cooling 42 300 12 400 4 45 0 24 1 06 2 20 0 24 3 24 1 06 13 56 2 20 14 70 0 24 1 06 2 20 0 24 3 24 1 06 13 56 2 20 14 70 Heating 47 400 57 700 13 900 16 900 4 40 7 40 Cooling 49 500 14 500 4 97 Heating 51 200 61 400 15 000 18 000 4 82 7 82 PCH 5GKHSA1 Single phase 50Hz 220 240V PCH 6GKHSA1 Munsell 0 70Y 8 59 0 97 Plate fin coil Sirocco ...

Page 11: ...HA1 PCH 4GKHSA1 PCH 5GKHSA1 PCH 6GKHSA1 Service Ref 5m 1 00 1 00 1 00 1 00 1 00 1 00 10m 0 992 0 989 0 981 0 989 0 981 0 975 15m 0 983 0 980 0 968 0 980 0 968 0 955 20m 0 978 0 970 0 952 0 970 0 952 0 935 25m 0 966 0 960 0 940 0 960 0 940 0 918 30m 0 959 0 950 0 925 0 950 0 925 0 900 35m 0 950 0 940 0 913 0 940 0 913 0 884 40m 0 945 0 930 0 900 0 930 0 900 0 869 45m 0 920 0 886 0 920 0 886 0 855 5...

Page 12: ...7156 6852 6585 9519 9115 8759 10272 9836 9453 1 75 1 89 2 01 1 78 1 92 2 04 2 31 2 49 2 66 2 53 2 72 2 90 3 32 3 58 3 81 3 63 3 92 4 17 4866 4675 4485 5573 5354 5136 6671 6409 6149 8202 7880 7560 10910 10481 10056 11773 11311 10851 1 93 2 08 2 22 1 96 2 11 2 26 2 55 2 75 2 94 2 78 3 00 3 20 3 65 3 94 4 21 4 00 4 31 4 61 5546 5337 5125 6351 6112 5869 7604 7317 7027 9348 8996 8639 12434 11966 11491 ...

Page 13: ...8 450 3 05 0 12 0 53 1 22 2 93 13 27 4 86 56 36 PCH 3GKHA1 Cooling 9 950 3 34 0 15 0 69 1 42 3 19 5 23 39 Heating 10 400 3 33 0 15 0 69 1 42 3 18 5 22 39 PCH 4GKHSA1 Cooling 12 300 4 42 0 22 1 01 2 10 4 20 7 05 51 Heating 13 800 4 37 0 22 1 01 2 10 4 15 6 97 51 PCH 5GKHSA1 Cooling 14 450 4 91 0 22 1 01 2 10 4 69 7 87 71 Heating 14 900 4 79 0 22 1 01 2 10 4 57 7 67 71 PCH 6GKHSA1 Indoor Outdoor Inp...

Page 14: ... 1 6 5 27 19 11 1 35 24 0 66 0 15 Heating 8 500 3 07 0 55 12 89 4 81 1 94 0 36 83 2 9 5 20 15 44 8 7 6 PCH 3GKHA1 PCH 3GKHA1 1 50 240 PUH 3VKA2 PUH 3YKA2 1 3 50 240 415 Cooling 10 000 3 36 0 70 5 24 1 83 0 50 78 48 6 7 5 27 19 11 1 35 24 0 68 0 12 Heating 10 450 3 35 0 70 5 22 1 72 0 39 75 1 0 5 20 15 42 1 7 6 PCH 4GKHSA1 PCH 4GKHSA1 1 50 240 PUH 4YKSA3 3 50 415 Cooling 12 400 4 45 1 06 6 89 1 92 ...

Page 15: ...nnection 26mm I D 5 Refrigerant pipe connection liquid pipe side flared connection 2 Drainage pipe connection for the left arrangement 6 Knock out hole for upper drain pipe arrangement 3 Knock out hole for left drain piping arrangement 7 Knock out hole for left drain pipe arrangement 4 Refrigerant pipe connection gas pipe side flared connection 8 Knock out hole for wining arrangement NOTES 1 Use M...

Page 16: ...ainage pipe connection 26mm I D 5 Refrigerant pipe connection liquid pipe side flared connection 2 Drainage pipe connection for the left arrangement 6 Knock out hole for upper drain pipe arrangement 3 Knock out hole for left drain piping arrangement 7 Knock out hole for left drain pipe arrangement 4 Refrigerant pipe connection gas pipe side flared connection 8 Knock out hole for wining arrangement...

Page 17: ...e connection 26mm I D 5 Refrigerant pipe connection liquid pipe side flared connection 2 Drainage pipe connection for the left arrangement 6 Knock out hole for upper drain pipe arrangement 3 Knock out hole for left drain piping arrangement 7 Knock out hole for left drain pipe arrangement 4 Refrigerant pipe connection gas pipe side flared connection 8 Knock out hole for wining arrangement NOTES 1 U...

Page 18: ...nage pipe connection 26mm I D 5 Refrigerant pipe connection liquid pipe side flared connection 2 Drainage pipe connection for the left arrangement 6 Knock out hole for upper drain pipe arrangement 3 Knock out hole for left drain piping arrangement 7 Knock out hole for left drain pipe arrangement 4 Refrigerant pipe connection gas pipe side flared connection 8 Knock out hole for wining arrangement N...

Page 19: ...19 2 REMOTE CONTROLLER Unit mm inch 18 130 Rear side wiring arrangement opening 120 FILTER CHECK MODE TEST RUN FILTER CHECK MODE TEST RUN 46 83 5 SW18 SW17 CAUTION ...

Page 20: ... off for cooling and on for heating 2 1 2 1 fig w1 Indoor fan motor MF for fig w2 When power supply is 3 1 DS OPTION DRAIN CN50 5 4 3 2 1 BLK GRY OPTION DP 6 HEATER CN24 D U M CNP 1 3 6GK H 5GK H 4GK H 1 2 3 4 OFF ON 1 2 3 4 OFF ON ON OFF 1 2 3 4 SW7 MODELS 3GK H 1 2 3 4 OFF ON 1 2 3 4 OFF ON 2 5GK H 2GK H ON OFF 1 2 3 4 SW7 MODELS 3 OFF ON 1 2 3 4 TRANSMISSION WIRES DC12V 14 3VAC 10VAC 1 3 TRANS ...

Page 21: ...ypass valve Compressor Accumulator Ball valve with service port Refrigerant pipe option 9 52mm 3 8 with heat insulator Capillary tube Restrictor valve Distributor with strainer Strainer Flared connection O D 3 2 I D 2 0 R820 2 O D 4 0 I D 2 0 R350 Thermal switch Indoor unit Indoor heat exchanger Refrigerant pipe option 19 05mm 3 4 with heat insulator Flexible tube Ball valve Strainer 4 way valve O...

Page 22: ...F Compressor OFF Fan STOP Four way valve OFF w2 w3 w6 w4 w5 w7 MAIN OPERATION w1 In addition the centralized control and remote control can be operated w2 The modes which indicate the sources of trouble are listed below EO Signal transmitting receiving error P1 Room temperature thermistor malfunction P2 Indoor coil thermistor malfanction P4 Drain sensor malfunction P5 Drain overflow P6 Coil frost ...

Page 23: ... tempreature is 10 C or higher 3 minute time delay Coil frost prevention release Allowance period 6 minute time delay Allowance set 1 min continue Coil frost protection FAN speed LOW FAN speed LOW 5 min elapse Outdoor unit trouble COOLING OPERATION w8 When operation stops or changes to cooling or dry mode the auto vane turns to a horizontal angle If operation changes during auto vane SWING the aut...

Page 24: ... Allowance set Compressor OFF Indoor piping 35 C or higher HOT adjust 6 min elapse FAN SPEED Low FAN SPEED Low 2 min elapse FAN SPEED setting nitch Hot adjust release PCH GKH S A Type 3 minute Auxiliary heater OFF Indoor coil thermistor is 60 C or higher FAN speed Low notti Airflow 10 up FAN setting notch Auto COOL HEAT operation Initial mode T1 T0 COOL mode HEAT mode COOL mode T1 T0 2 After 15min...

Page 25: ...ble to set the fan speed with the remote controller DRY OPERATION DRY operation Four way valve OFF Initial dry operation Room tempereature is 18 C or lower During compressor ON Compressor thermostat ON Vane initial setting Vane setting notch 10 minute compressor OFF timer start Compressor OFF Fan STOP 3 minute time delay 10 minute compressor OFF Compressor ON time set Compressor ON Fan speed LOW 1...

Page 26: ...OP Fan speed control Crankcase heater control ON OFF Self diagnostic function Independent Control of Outdoor Unit OUTPUT to indoor unit INPUT from indoor unit INPUT to remote controller Remote controller board Processes and transmits orders orders OUTPUT to remote controller Indoor controller board Receives orders from remote controller and temperature data from indoor unit Processes orders and da...

Page 27: ... indoor controller board the start temperature of coil frost prevention changes from 1 C to 3 C How to operate 1 Press POWER ON OFF button 2 Press the a button to display f 3 Press the i TEMP button to set the desired temperature NOTE Set temperature changes 1 C when the or button is pressed one time Cooling 19 C to 30 C Minimum 3 minutes w1 ON Thermostat Indoor fan Auto vane Booster heater Drain ...

Page 28: ... changes to another mode 2 Indoor fan control Indoor fan speed LOW HIGH depends on the remote controller setting However if an outdoor unit abnormality is detected the indoor fan speed will be LOW regardless of the remote controller setting When the outdoor unit abnormality detection is released and the fan speed returns to the set speed the quiet cycle control will work a Normal control i Fan spe...

Page 29: ...rns ON when the SWING mode is selected The vane motor is continuously ON during SWING mode When 40 degrees or 60 degrees airflow is selected with the LOW fan speed in COOL operation AUTO RETURN will appear below the temperature display One hour later the airflow direction returns to horizontal automatically and AUTO RETURN will disappear If the airflow direction is set to horizontal during AUTO RE...

Page 30: ...rees either way of room temperature RANGE C Indoor coil temperature is more than 5 degrees below room tempetature Indoor coil temperature minus room temperature 5 0 5 RANGE A RANGE B RANGE C degree 5 Drain pump control OPTION The drain pump works in COOL or DRY operation When operation stops or changes to HEAT mode the drain pump continues to operate for 3 more minutes The drain pump does not work...

Page 31: ...et temperature during this period the compressor will not start until this period has ended 2 2 DRY operation 1 Compressor control 13 minute time delay To prevent overload the compressor will not start within 3 minutes after stop 2The compressor runs when the room temperature is higher than the set temperature The compressor stops when the room temperature is equal to or lower than the set tempera...

Page 32: ... 26 with themostat ON the compressor will operate for 2 more min utes and then stop for 3 minutes If the room temperature thermistor reads below 24 with themostat ON the compressor will stop for 3 minutes If the thermistat is OFF regaedless of room temperatere the compressor will stop for 10 minutes 5Coil frost protection Coil frost protection in DRY operation is the same as in COOL operation 6Coi...

Page 33: ...nds on remote controller setting Depends on remote controller setting Extra LOW 1 Extra LOW 1 LOW Minimum 3 minutes 2 Hot adjustment Horizontal w2 Even if the room temperature rises above the set temperature during this period the compressor will not start until this period has ended 2 3 HEAT operation FILTER CHECK MODE TEST RUN 4 How to operate 1 Press POWER ON OFF button 2 Press the a button to ...

Page 34: ...tat turns OFF 2 Indoor fan control a Normal control The indoor fan runs on EXTRA LOW speed during the thermostat OFF EXTRA LOW speed can be changed to LOW or HIGH speed by setting the Jumper resistance J1 and J1 8 If the indoor coil temperature becomes more than 5 degrees below the room temperature during the thermostat OFF the indoor fan will stop After when the indoor coil temperature becomes wi...

Page 35: ...abnormalities in the outdoor unit When the outdoor unit is determined to be abnormal by the following causes the compressor will stop and the check code P8 will appear on the remote controller display 1 During compressor ON after hot adjustment 1 If the difference between the indoor coil temperature and room temperature is in the RANGE B the indoor fan will stop 2 Within 20 minutes after entering ...

Page 36: ...emperature and room temperature gets out of RANGE A and into RANGE B the indoor unit starts the defrosting mode After the outdoor unit stops the defrosting operation when the temperature difference returns to the RANGE A the indoor unit stops the defrosting mode While the indoor unit is in the defrosting mode the indoor fan and the booster heater stop w1 RANGE A Indoor coil temperature is more tha...

Page 37: ...3 Temperature range AUTO operation is available under the outside air temperatures as follows Mode change HEAT COOL When room temperature becomes 2 degrees above the set temperature the operation mode can not be changed for 15 minutes degree To 2 To Set temperature 19 28 To 1 To To 1 To 2 Compressor Start HEAT mode HEAT mode Mode change 15 minutes Minimum 3 minutes 15 minutes Minimum 3 minutes COO...

Page 38: ...matically and AUTO RETURN disappears 2 HEAT operation At the start up of HEAT operation airflow direction depends on the setting of the last operation After it can be changed to another direction with button The airflow direction shifts to horizontal regardless of the remote controller settings under any of the following conditions Thermostat OFF Defrosting Indoor fan speed EXTRA LOW in hot adjust...

Page 39: ...tion OFF TEST RUN button TEST RUN Indoor coil temperature code Display Display FILTER CHECK MODE TEST RUN 4 Remote controller 1 Turn on main switch 12 hours before proceeding to step 2 to allow for crankcase heater operation 2 Push the TEST RUN button twice and indication of TEST RUN will be shown on the liquid crystal display 4 Push button LOW HIGH to check that the fan speed changes properly 6 A...

Page 40: ...tion is working release the protective function before starting the emergency operation CAUTION When the self diagnostic function indicates a check code of P5 drain pump malfunction DO NOT start the emergency operation because the drain may overflow How to operate 1 For emergency cooling set the dipswitch SW3 1 to ON and SW3 2 to OFF For emergency heating set the dipswitch SW3 1 2 to ON 2 Turn ON ...

Page 41: ...ay box PZ 12RB E LOSSNAY LOSSNAY LOSSNAY control switch PZ 05SLB2 E LOSSNAY control switch PZ 05SLB2 E Mr SLIM Mr SLIM Remote controller Remote controller Remote display adapter PAC SA88HA E Power supply Power supply Relay box Junction box field supplied LOSSNAY A B L N HIGH N Terminal block Terminal block Mr SLIM CN51 12V DC Mr SLIM 10m Insulation is needed Connecting wire 0 13mm or over Circuit ...

Page 42: ... 1 For all current models Not Provided 3 For previous special models J1 6 Switch for set temperature adjustment in HEAT mode During HEAT operation warm air collects near the ceiling When the indoor unit is installed near the ceiling the temperature read by room temperature thermistor differs from the actual living space temperature by about 4 degrees Therefore the room temperature read by room tem...

Page 43: ...ane horizontal angle Upper angle J5 4 This jumper is unavailable for PCH GKA keep this 5 SW6 Model selector 6 SW7 Model selector SW7 1 7 3 7 4 Capacity setting 7 J9 Model selector 1 2 3 4 5 6 ON OFF 1 2 ON OFF 1 2 ON OFF 1 2 ON OFF 2 3 4 1 2 3 4 ON OFF SW6 1 OFF ON Twin No 1 ON Triple No 1 SW6 2 OFF ON Twin No 2 ON Triple No 2 SW6 3 OFF OFF ON Triple No 3 SW6 4 OFF OFF ON Single control Twin contr...

Page 44: ...he phase control will start a During fan OFF The phase control turns OFF One second later the indoor fan relay will turn OFF Service Ref Voltage V 100 rotational frequency rpm 220 230 240 220 230 240 220 230 240 220 250 240 220 230 240 220 230 240 15Hz 1370 1380 1390 1350 1360 1370 1350 1360 1370 1150 1160 1170 1150 1170 1190 1160 1180 1200 PCH 2GKHA1 PCH 2 5GKHA1 PCH 3GKHA1 PCH 4GKHSA1 PCH 5GKHSA...

Page 45: ...d the heating operation even with the high outside air temperature 3 2 Outdoor unit control The outdoor unit turns ON OFF the cooling heating operation according to orders given from the indoor unit 3 3 Protective functions 1 If an reversed phase an open phase or an indoor controller abnormality is detected the outdoor unit will stop operation and the check mode will start For the check mode detai...

Page 46: ... compressor operation exceeds defrost interval Further information on the defrost interval is described in 3 C After the total time of compressor operation exceeds the defrost interval the thermostat repeats ON OFF three times Two minutes after the fourth ON of the thermostat if the outdoor coil thermistor reads 5 C or below and the fan output output is 100 defrosting will start NOTE The count of ...

Page 47: ...ve returns to OFF 2When the compressor operates with the bypass valve at ON for more than 30 minutes the bypass valve turns OFF 3When the compressor stops with the bypass valve at OFF the bypass valve turns ON and remains ON for three minutes Heating mode 1When the unit starts for the first time after the circuit breaker has been turned ON or when it starts after the compressor OFF of 30 minutes o...

Page 48: ...again 2SW3 setting is changed 3The compressor stops 4Defrosting operation starts 3 Function of switches on the outdoor controller board SW1 Clears the check code memory push button switch SW2 Switches the output state indication and the check code display push button switch SW3 1 2 Switches the output state indication items dip swtich For further information refer to page 47 4 100 fan output Fan o...

Page 49: ...ort circuit of indoor outdoor connecting wire 2 Short circuit of transmission wire 3 Short circuit of drain sensor heater circuit 4 Wrong operation of remote controller due to noise wave emitted by other appliances 1 2 Check the wire 3 Measure the resistance of the drain sensor connector CN50 1 3 Normal resistance should be 82Ω 4 Turn the circuit breaker OFF and then turn ON If the remote controll...

Page 50: ...dvance or go back to the unit address Each time TEMP button is pressed the unit address advances by one Each time TEMP button is pressed the unit address goes back by one The check code and the unit address appear alternately 2 The check code U8 means no malfunction has occurred since installation The check code EO means the following conditions The unit address displayed on the remote controller ...

Page 51: ...rd P5 Malfunction of drain pump 1 Malfunction of drain pump 2 Damaged drain sensor 1 Check the drain pump 2 Check the drain sensor Check the drain sensor heater Normal resistance should be 82Ω If the resistance is normal replace the indoor controller board P6 Coil frost protection is working 1 Short cycle of air cycle 2 Dirty air filter 3 Damaged fan 4 Abnormal refrigerant 1 Clear obstructions fro...

Page 52: ...tput state and check code alternately When SW2 is turned On with SW3 1 OFF and SW3 2 ON the compulsory defrosting starts SW3 Output state indication items depend on the combination of SW3 1 ON OFF and SW3 2 ON OFF Changed alternately by pressing SW2 Check code Output state Outdoor coil temperature bit Fan Output step bit Total time of compressor operation Hr SW3 1 OFF OFF OFF ON ON SW3 2 OFF OFF O...

Page 53: ...during operation the operation stops and restarts after the 3 minutes time delay mode When the protection function works again the operation stops Check mode When both SW3 1 and SW3 2 are OFF the check code is indicated If the outdoor controller board receives the compressor ON command from the indoor controller board during check mode the indication changes to output state indication By pressing ...

Page 54: ...y 51C function 51C was connected incorrectly 51C was working Check 51C the compressor and power supply LD6 Thermal switch 26C function 26C was connected incorrectly 26C is working Check 26C Check if refrigerant supply is low Check if the capillary tube is clogged LD7 Over heat protection The thermistor is broken Coil temperature is over 67 C Measure the resistance of the thermistor Check the outdo...

Page 55: ...Operation stops 9 minutes later check code P8 appears on remote controller display HEAT OFF Operation stops ON Operation stops 27 minutes later check code P8 appears on remote controller display Outdoor Indoor 1 2 3 1 2 3 COOL OFF Outdoor unit stops ON Operation stops 9 minutes later check code P8 appears on remote controller display HEAT OFF Operation stops ON Operation stops 27 minutes later che...

Page 56: ...Air discharge display is OFF and button does not operate Indoor controller board deems the auto vanes are not attached to the unit Horizontal anlgle can not be detected In this case remote controller is normal Power ON OFF button is not available Beep sound is heard but display is turned OFF Beep sound is not heard and display remains OFF Indoor outdoor connecting wire is connected incorrectly Ind...

Page 57: ...al cover 4 Disconnectors including CN6V and CN21 5 Remove the screws from the electrical box and pull out the electrical box Electrical parts in the electrical box Terminal block for power supply Terminal block for in outdoor connecting wire Terminal block for remote controller Fan motor capacitor Indoor control board Relay Transformer Figure 1 Figure 2 Photo 1 slide Intake grill Intake grill Hold...

Page 58: ... for removing the motor guard 4 Unscrew screws for removing the fan guard 5 Remove the lower casing while pressing the stoppers at upper side of the casing 6 Loosen the set screws at the connecting joint 7 Remove the sirocco fan and shaft together by sliding the shaft to the left Note Make sure that the upper side casing is snaped to the fan plate securely with catch 5 Removing the side panel 1 Re...

Page 59: ...emove the under panel w Weight of the under panel app 2kg 7 Removing the Indoor coil thermistor 1 Remove the air intake grill 2 Remove the right side panel 3 Remove the relay connector of the pipe thermistor 4 Remove the screw and remove the check panel 5 Extract the indoor coil thermistor from the holder Caution for the installation There is a possibility for the short circuit when connector gets...

Page 60: ... you remove the drain pump option 10 Removing the guide vane 1 Remove the intake grill 2 Remove the beam 3 Remove the side panel right and left 4 Remove the under panel 5 Remove the drain pan 6 Remove the screw from the guide vane then remove the guide vane 11 Removing the Auto vane 1 Remove the intake grill 2 Remove the left side panel 3 Remove the left side box 4 Remove the under panel 5 Remove ...

Page 61: ...move the heat exchanger with care Since this is quite heavy removing work should be done with more than 2 people wWeight of heat exchanger App 5 3kg Photo 11 Clamp Connector heater Screws 12 Removing the support heater 1 Remove the air intake grill 2 Remove the beam 3 Remove the side panel right and left 4 Remove the relay connector for the pipe thermistor 5 Remove the under panel 6 Remove the dra...

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