Mitsubishi Electric PUHZ-W112VAA 11.2kW Mono Service Manual Download Page 36

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OCH681

Outdoor noise filter circuit board

PUHZ-W85YAA.UK PUHZ-W112YAA.UK

LI1, LI2, LI3, NI

POWER SUPPLY

LI1-LI2/LI-LI3/LI3-LI1 : 400 V AC input

LI1-NI/LI2-NI/LI3-NI : 230 V AC input

(Connect to the terminal block (TB1))

CNAC2

230 V AC

(Connect to the outdoor controller

circuit board (CNAC))

CNDC

(Connect to the

outdoor controller

circuit board

(CNDC))

LO1, LO2, LO3

POWER SUPPLY

LO1-LO2/LO2-LO3/LO3-LO1 : AC400V OUTPUT

(Connect to the outdoor converter circuit board (L1-IN), ACL2, ACL3)

CNCT

Primary current

(Connect to the

outdoor power

circuit board (CN5))

CNL

Connect to the ACL4

Connect to the outdoor

converter circuit board

(N-IN)

Summary of Contents for PUHZ-W112VAA 11.2kW Mono

Page 1: ...5 4 DATA 6 5 OUTLINES AND DIMENSIONS 7 6 WIRING DIAGRAM 8 7 WIRING SPECIFICATIONS 10 8 REFRIGERANT SYSTEM DIAGRAM 11 9 TROUBLESHOOTING 13 10 MONITORING THE OPERATION DATABY THE REMOTE CONTROLLER 50 11 DISASSEMBLY PROCEDURE 56 Note This manual describes service data of the outdoor units only AIR TO WATER HEAT PUMP UNITS Service Ref PUHZ W85VAA UK PUHZ W112VAA UK PUHZ W85YAA UK PUHZ W112YAA UK ...

Page 2: ...EHPX VM6B EHPX YM9B EHPX VM2B UK EHPX VM6B UK EHPX YM9B UK OCH532 OCB532 EHPX VM2C EHPX VM6C EHPX YM9C EHPX VM2CR2 UK EHPX VM6CR2 UK EHPX YM9CR2 UK OCH571 OCB571 EHPT20X VM2C EHPT20X VM6C EHPT20X YM9C EHPT20X TM9C EHPT20X MHCW EHPT20X VM2C2 EHPT20X VM2CR2 UK EHPT20X VM6CR2 UK EHPT20X YM9CR2 UK EHPT20X TM9CR2 UK EHPT20X MHCWR2 UK EHPT20X VM2C2R2 UK OCH570 OCB570 PAC IF011B E PAC IF032B E PAC IF011B...

Page 3: ...ate the room if refrigerant leaks during operation If refrigerant comes into contact with a flame poisonous gases will be released Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held...

Page 4: ...from cylinder 1 Check that cylinder for R410A on the market is a syphon type 2 Charging should be performed with the cylinder of syphon stood vertically Refrigerant is charged from liquid phase No Tool name Specifications 1 Gauge manifold Only for R410A Use the existing fitting specifications UNF1 2 Use high tension side pressure of 5 3 MPa G or over 2 Charge hose Only for R410A Use pressure perfo...

Page 5: ... 97 214 110 243 Refrigerant R410A Charge kg lb 2 4 5 3 Oil Model L 0 60 FV50S Water pipe connection G1 ISO 228 1 Service Ref PUHZ W112VAA UK PUHZ W112YAA UK OUTDOOR UNIT Power source Phase cycle voltage Single 50 Hz 230 V 3 Phase 50 Hz 400 V Max current A 28 0 13 0 External finish Munsell N8 75 Munsell N2 75 FRONT PANEL Refrigerant control Linear Expansion Valve Compressor Hermetic Model DNB28FBAM...

Page 6: ...0 OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 µ bar 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES Hz COOLING MODE HEATING 49 SPL dB 47 LINE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 90 80 70 60 50 40 30 20 10 OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 µ bar 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR ...

Page 7: ...7 OCH681 5 OUTLINES AND DIMENSIONS PUHZ W85VAA UK PUHZ W112VAA UK PUHZ W85YAA UK PUHZ W112YAA UK Unit mm ...

Page 8: ... Thermistor Inlet Water Linear Expansion Valve Reactor CY1 CY2 P B C B Capacitor Power Circuit Board Controller Circuit Board Switch Manual Defrost Defect History Record Reset Refrigerant Address Switch Function Switch Switch Function Switch Switch Function Switch Switch Function Switch Model Select Switch Function Switch Switch Function Switch Switch Function Switch Connector Connection for Optio...

Page 9: ...unction Switch Model Select Switch Function Switch Switch Function Switch Switch Function Switch Connector Connection for Option Connector Connection for Option Connector Connection for Option Fuse T6 3AL250V SYMBOL NAME SYMBOL NAME P B N F t C B 21S4 X51 X52 3 1 21S4 GN SV3 SS WH 3 1 X54 3 1 SV1 CH GY 7 1 MS 3 5 CNF1 WH MF1 63H t 5 1 LEV A WH 3 1 63H YE 3 1 TH33 YE 1 2 t 1 4 t t TH3 WH TH7 6 RD L...

Page 10: ...sulated by the transformer or other device S1 S2 S3 S1 S2 S3 Warning In case of A control wiring there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power line and communication signal line Therefore please turn off the main power supply when servicing And do not touch the S1 S2 S3 terminals when the power is energized If...

Page 11: ...or For LEV control and for compressor protection TH6 Plate HEX liquid temperature thermistor Heating Sub cool liquid temperature Cooling Evaporating temperature TH7 Ambient temperature thermistor For fan control and for compressor frequency control TH8 Heat sink temperature thermistor For power board protection TH33 Comp surface temperature thermistor For protection TH34 Inlet water temperature th...

Page 12: ... temperature from high pressure LEV A Linear expansion valve A Heating Secondary LEV Cooling Primary LEV LEV B Linear expansion valve B Heating Primary LEV Cooling Secondary LEV TH3 Liquid temperature thermistor Heating Evaporating temperature Cooling Sub cool liquid temperature TH4 Discharge temperature thermistor For LEV control and for compressor protection TH6 Plate HEX liquid temperature ther...

Page 13: ...se of the trouble according to 9 3 TROUBLESHOOTING OF PROBLEMS The trouble is not reoccurring Logged Not logged 1Consider the temporary defects such as the work of protection devices in the refrigerant circuit including compressor poor connection of wiring noise etc Re check the symptom and check the installation environment refrigerant amount weather when the trouble occurred matters related to w...

Page 14: ... to 9 6 TEST POINT DIAGRAM 5 a Check connection of outdoor noise filter circuit board b Replace outdoor noise filter circuit board Refer to 9 6 TEST POINT DIAGRAM 6 Replace outdoor power circuit board 7 Replace rush current protect resistor RS Power circuit board might be short circuit Check the power circuit board Refer to 9 6 TEST POINT DIAGRAM 8 Replace controller board When items above are che...

Page 15: ...length of indoor outdoor unit connecting wire Total wiring length 80 m including wiring connecting each indoor unit and between indoor and outdoor unit Also check if the connection order of flat cable is S1 S2 S3 3 Check the number of indoor units that are connected to one outdoor unit If EA is detected 4 6 Turn the power off once and on again to check Replace outdoor controller circuit board indo...

Page 16: ...heated compressor operation caused by shortage of refrigerant 2 Defective operation of stop valve 3 Defective thermistor 4 Defective outdoor controller board 5 Defective action of linear expansion valve 6 Clogging with foreign objects in refrigerant circuit Note Clogging occur in the parts which become below freezing point when water enters in refrigerant circuit 7 In the case of the unit does not...

Page 17: ...Defective outdoor controller circuit board U6 4250 Power module Check abnormality by driving power module in case overcurrent is detected UF or UP error condition 1 Outdoor stop valve is closed 2 Decrease of power supply voltage 3 Looseness disconnection or converse of compressor wiring connection 4 Defective compressor 5 Defective outdoor power circuit board 1 Open stop valve 2 Check facility of ...

Page 18: ...2V 8 Replace outdoor controller circuit board W85V W112V 04 Input current sensor error L1 phase open error Decrease in input current through outdoor unit to 0 1A only if operation frequency is more than or equal to 40Hz or compressor current is more than or equal to 6A 1 L1 phase open W85Y W112Y 2 Disconnection or loose connection between TB1 and outdoor noise filter circuit board W85Y W112Y 3 Dis...

Page 19: ...connection of reactor DCL1 3 5 Defective outdoor power circuit board 6 Defective reactor DCL1 3 7 Disconnection or loose con nection of CN2 on the outdoor power circuit board controller circuit board 12 Check the field facility for the power supply 3 Correct the wiring U V W phase to compressor Refer to 9 6 TEST POINT DIAGRAM Outdoor power circuit board 4 Correct the wiring of reactor DCL1 3 5 Rep...

Page 20: ...g circuit of remote controller 4 Defective transmitting receiving circuit of indoor controller board of refrigerant address 0 5 Noise has entered into the transmission wire of remote controller Compressor overcurrent interruption Abnormal if overcurrent DC bus or compressor is detected after compressor starts operating for 30 seconds 1 Stop valve of outdoor unit is closed 2 Decrease of power suppl...

Page 21: ...ard 3 Replace outdoor power circuit board 4 Replace outdoor controller circuit board E8 6840 Indoor outdoor unit communication error Signal receiving error Outdoor unit Abnormal if outdoor controller circuit board could not receive anything normally for 3 minutes 1 Contact failure of indoor outdoor unit connecting wire 2 Defective communication circuit of outdoor controller circuit board 3 Defecti...

Page 22: ...efrigerant 5 Check linear expansion valve Refer to 9 5 HOW TO CHECK THE COMPONENTS PE Inlet water temperature Abnormal if the following conditions are detected for continuously 10 seconds 1 Cooling mode During compressor operation TH34 3 2 Heating mode exclude defrosting During compressor operation TH34 10 3 Defrosting mode During compressor operation TH34 0 Thermistor TH34 Inlet water temperature...

Page 23: ...play is appeared but it will be turned off soon 1 After cancelling to select function from the remote controller the remote controller opera tion switch will be not accepted for approx 30 seconds 1 Normal operation 4 Remote controller display works normally and the unit performs cooling operation however the capacity cannot be fully obtained 1 Refrigerant shortage 2 Filter clogging 1 If refrigeran...

Page 24: ...may form and drip from the cool pipes and joints During heating mode water may form and drip from the heat exchanger of outdoor unit During defrosting mode water on the heat exchanger of outdoor unit evaporates and water vapour may be emitted The operation indicator does not appear in the remote control ler display Turn on the power switch will appear in the remote controller dis play appears in t...

Page 25: ...agnosis after turning on the main power Normal The startup diagnosis will be over in around 2 minutes Miswiring of indoor outdoor connecting wire Breaking of indoor outdoor connecting wire S3 Defective indoor controller board Defective outdoor controller circuit board Refer to Self diagnosis action table in order to solve the trouble In case of communication errors the display of remote controller...

Page 26: ... outdoor unit Check if the wiring is bad Check if the fuses are blown The fuses on the outdoor controller circuit board will be blown when the indoor outdoor connecting wire short circuits Bad wiring of the outdoor controller board The fuses on the outdoor controller circuit board are blown Check if miswiring breaking or poor contact is causing this problem Indoor outdoor connecting wire is polari...

Page 27: ...or controller circuit board Replace the outdoor controller circuit board Normal Only the unit which has the refrigerant address 0 supplies power to the remote controller Set the refrigerant address to 0 In case of the multiple outdoor units control recheck the refrigerant address again Defective indoor power board Replace the indoor power board Defective outdoor power circuit board Replace the out...

Page 28: ...r poor contact of the remote controller wire Check the voltage of the remote controller wire If it is not between 10 and 16 V DC the indoor controller board must be defective The remote controller wire short circuits Check if the remote controller wire is short circuited Defective indoor controller board Replace the indoor controller board Diagnosis flow Cause Inspection method and troubleshooting...

Page 29: ...between the terminals with a tester At the ambient temperature 20 Solenoid valve coil 4 way valve 21S4 Motor for compressor MC Linear expansion valve LEV A LEV B Normal Abnormal Open or short Disconnect the connector then measure the resistance with a tester Winding temperature 20 Normal Gray Black Gray Red Gray Yellow Gray Orange Abnormal 46 3 Open or short Refer to the next page Fan motor MF1 Me...

Page 30: ...C 280 380 V DC TEST POINT 2 VCC between 5 and 4 of the fan connector VCC 15 V DC Replace the defective fan motor Replace the outdoor controller board Replace the defective fan motor Replace the outdoor controller board C B and the defective fan motor MF1 Replace outdoor controller board Replace the defective fan motor Is the voltage normal Is the resistance abnormal Yes Yes No No Fan motor check C...

Page 31: ...ant 4150 3 Rt 17exp 4150 273 t 323 1 1 Thermistor R120 7 465 k 2 B constant 4057 2 Rt 7 465exp 4057 273 t 393 1 1 Medium temperature thermistor Thermistor Heat sink TH8 20 250 k 30 160 k 40 104 k 50 70 k 60 48 k 70 34 k 80 24 k 90 17 5 k 100 13 0 k 110 9 8 k High temperature thermistor Thermistor Discharge TH4 Thermistor Comp surface TH33 0 10 20 30 40 50 20 10 0 10 20 30 40 50 Temperature Resista...

Page 32: ...e thermistor Thermistor Inlet water TH34 0 15 k 10 9 6 k 20 6 3 k 25 5 2 k 30 4 3 k 40 3 0 k Thermistor R0 15 k 2 5 B constant 3450 2 Rt 15exp 3450 273 t 273 1 0 10 20 30 40 50 20 10 0 10 20 30 40 50 Temperature Resistance k 1 ...

Page 33: ... the valve is locked sound can be heard No sound is heard when the pulse number moves from B to A in case coil is burnt out or motor is locked by open phase Sound can be detected by placing the ear against the screw driver handle while putting the screw driver to the linear expansion valve LEV M 1 6 4 4 3 2 1 1 Gray Orange Red Yellow Black 2 3 4 5 Connector LEV A LEV B LEV C 12 V DC Outdoor contro...

Page 34: ...herwise pipes can bend due to stress How to attach the coil Hold the lower part of the main body shown as A firmly so that the main body does not move and attach the coil by inserting it downward into the main body Then securely attach the coil stopper to main body At this time be careful that stress is not added to lead wire and main body is not wound by lead wire If the stopper is not firmly att...

Page 35: ... CN51 External signal output Compressor operat ing signal Abnormal signal LEV A B Linear expansion valve SW8 Pipe replace Wiring replace CNM Connect to A control service tool CN2 Connect to the outdoor power circuit board CN2 1 5 Reception from power circuit board 2 5 Zero cross signal 0 5 V DC 3 4 Not used W85Y W112Y 18 V DC W85V W112V 6 5 16 V DC 7 5 16 V DC 9 6 TEST POINT DIAGRAM Outdoor contro...

Page 36: ...ock TB1 CNAC2 230 V AC Connect to the outdoor controller circuit board CNAC CNDC Connect to the outdoor controller circuit board CNDC LO1 LO2 LO3 POWER SUPPLY LO1 LO2 LO2 LO3 LO3 LO1 AC400V OUTPUT Connect to the outdoor converter circuit board L1 IN ACL2 ACL3 CNCT Primary current Connect to the outdoor power circuit board CN5 CNL Connect to the ACL4 NO Connect to the outdoor converter circuit boar...

Page 37: ...he outdoor controller circuit board CNDC U V W Connect to the compres sor MC Voltage among phases 10 180 V AC N1 N L P1 N2 W2 V2 U2 P2 N3 W3 V3 U3 P3 Brief Check of DIP IPM and DIODE MODULE Usually they are in a state of being short circuited if they are broken Measure the resistance in the following points connectors etc If they are short circuited it means that they are broken 1 Check of DIP IPM...

Page 38: ...rent Connect to the outdoor noise filter circuit board CNCT CN4 Connect to the outdoor controller circuit board CN4 CN2 Connect to the outdoor controller circuit board CN2 1 5 Power circuit board Transmitting signal to the controller board 0 5V DC 2 5 Zero cross signal 0 5 V DC 3 4 Not used 6 5 16 V DC 7 5 16 V DC 5 1 2 6 7 CN7 Connect to the outdoor converter circuit board CN7 TB U TB V TB W Conn...

Page 39: ... A2 L3 A2 Connect to the ACL1 ACL2 ACL3 CN7 Connect to the outdoor power circuit board CN7 CK OU Connect to the CK capacitor L1 IN N IN Connect to the noise filter circuit board LO1 NO L1 A1 Connect to the ACL1 L1 OU L2 OU L3 OU Connect to the outdoor power circuit board TB L1 L2 L3 ...

Page 40: ...re is no problem if DIP SW1 1 is left ON or changed to OFF again This depends on the service conditions Switch Type of switch DIP switch SW1 1 2 No Function Effective timing Action by the switch operation Manual defrost 1 Start Normal When compressor is working in heating operation 1 Abnormal history clear Refrigerant address setting When power supply ON Clear Normal off or operating 6 5 4 3 SW4 S...

Page 41: ...or CN31 Emergency operation Start Normal When power supply ON The black square indicates a switch position Type of Switch Switch No Function Action by the switch operation Effective timing ON OFF DIP switch SW5 1 No function 2 Power failure automatic recovery 2 Auto recovery No auto recovery When power supply ON 3 4 5 6 No function SW7 3 1 2 3 No function 4 No function 5 No function 6 Defrost sett...

Page 42: ... displayed when compressor stops due to the work of protection devices Display Contents to be inspected When power is turned on F3 F5 F9 E8 E9 EA Eb EC EE E0 E7 63L connector red is open 63H connector yellow is open 2 connectors 63H 63L are open Indoor outdoor communication error Signal receiving error Outdoor unit Indoor outdoor communication error Transmitting error Outdoor unit Miswiring of ind...

Page 43: ...s digit and ones digit are displayed by turns Example When 2450 hours 245 10 hours 0 5 s 0 5 s 2 s 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Compressor operating current 0 to 50 Primary LEV opening pulse 0 to 500 Heating LEV B Cooling LEV A 0 to 50 Note Value after the decimal point will be truncated 0 to 500 When it is 100 pulse or more hundreds digit tens digit and ones digit are displayed by...

Page 44: ... or more the hundreds digit tens digit and ones digit are displayed by turns Example When 130 0 5 s 0 5 s 2 s A Code display Code display 0 to 50 When no error history 0 and are displayed by turns When no error history 0 and are displayed by turns 1 ON 2 3 4 5 6 Thermo ON time 0 to 999 Test run elapsed time 0 to 120 0 to 999 When it is 100 minutes or more the hundreds digit tens digit and ones dig...

Page 45: ...se 3 phase Display details 0 H P 1 Cooling only 0 Single phase 2 3 phase Setting details Defrosting switch Display details 0 Normal 1 For high humidity Example When heat pump 3 phase and defrosting normal are set up 20 is displayed 1 ON 2 3 4 5 6 Condensing temperature T63HS 39 to 88 39 to 88 When the temperature is 0 or less and temperature are displayed by turns 0 to 100 The black square indicat...

Page 46: ...s digit and ones digit are displayed by turns The black square indicates a switch position 2 cycles Number of defrost cycles 0 to FFFE 0 to FFFE in hexadecimal notation When more than FF in hex 255 in decimal the number is displayed in order of 163 s and 162 s and 161 s and 160 s places Example When 5000 cycles 0 5 s 0 5 s 2 s C4 9 Normal Overvoltage error Undervoltage error Input current sensor e...

Page 47: ...istor display When there is no error thermistor is displayed Code display Operation frequency on error occurring 0 to 255 0 to 255 When it is 100 Hz or more hundreds digit tens digit and ones digit are displayed by turns Example When 125 Hz 0 5 s 0 5 s 2 s 1 ON 2 3 4 5 6 Hz Fan step on error occurring 0 to 10 0 to 10 1 ON 2 3 4 5 6 Step 25 1 The black square indicates a switch position Return wate...

Page 48: ...2 3 4 5 6 1 ON 2 3 4 5 6 15 The black square indicates a switch position 0 to 255 When the temperature is 100 C or more hundreds digit tens digit and ones digit are displayed by turns Example When 150 C 0 5 s 0 5 s 2 s 0 to 130 When the temperature is 100 C or more hundreds digit tens digit and ones digit are displayed by turns Example When 115 C 0 5 s 0 5 s 2 s Thermo on time until error stops 0 ...

Page 49: ...ting status of unit Display Compressor operating frequency control Display Compressor operating frequency control Primary current control Secondary current control 1 2 1 4 8 2 The tens digit The ones digit In this digit the total number of activated control is displayed Preventive control for excessive temp erature rise of discharge temperature Preventive control for excessive temp erature rise of...

Page 50: ... TH4 Outdoor unit Liquid pipe 1 temperature TH3 Outdoor unit Outside air temperature TH7 Outdoor unit Heat sink temperature TH8 Discharge superheat SHd Sub cool SC Compressor Operating frequency Compressor Target operating frequency Outdoor unit Fan output step Outdoor unit Fan 1 speed Only for air conditioners with DC fan motor Outdoor unit Fan 2 speed Only for air conditioners with DC fan motor ...

Page 51: ...history 1 latest Outdoor unit Error postponement history 2 previous Outdoor unit Error postponement history 3 last but one Examples Ver 5 01 Auxiliary information displayed after version information Examples Ver 5 01 A000 Displays postponement code is displayed if no postponement code is present Displays postponement code is displayed if no postponement code is present Displays postponement code i...

Page 52: ...third to last Abnormal thermistor display TH3 TH6 TH7 TH8 Operation mode at time of error Compressor Operating current at time of error Compressor Accumulated operating time at time of error Compressor Number of operation times at time of error Discharge temperature at time of error Outdoorunit Liquidpipe1temperature TH3 attimeoferror Outdoor unit Outside air temperature TH7 at time of error Outdo...

Page 53: ... STOP FAN C COOL DRY H HEAT d DEFROST Relay output state Display Power currently Compressor Four way valve Solenoid valve supplied to compressor Outdoor unit Control state Request code 51 Data display State 0 0 0 0 Normal 0 0 0 1 Preparingforheatoperation 0 0 0 2 Defrost Compressor Frequency control state Request code 52 Data display 0 0 Frequency control state 2 Frequency control state 1 Frequenc...

Page 54: ...ON ON ON ON ON ON ON ON ON ON ON ON ON Actuator output state 2 Display 52C SV2 SS 0 1 2 3 4 5 6 7 ON ON ON ON ON ON ON ON ON ON ON ON Error content U9 Request code 55 Data display Error content 1 Error content 2 0 0 Error content 1 Detected Display Overvoltage Undervoltage L1 phase Power synchronizing error error open error signal error 0 1 2 3 4 5 6 7 8 9 A b C d E F Error content 2 Detected Disp...

Page 55: ...ation 1 Display Defrost mode 0 Standard 1 For high humidity Setting information 2 Display Single Heat pump 3 phase cooling only 0 Single phase Heat pump 1 Cooling only 2 3 phase Heat pump 3 Cooling only Outdoor unit Capacity setting display Request code 70 Data display Capacity 10 50 9 35 11 60 14 71 20 100 25 125 28 140 40 200 50 250 ...

Page 56: ... strap for the lead wire on the comp case front 6 Disconnect the connectors CNF1 WH TH3 WH TH4 WH TH7 6 RD TH33 YE TH34 RD 63H YE 63HS WH 21S4 GN LEV A WH and LEV B RD from the controller circuit board Symbols on the board Fan motor CNF1 Thermistor Liquid TH3 Thermistor Discharge TH4 Thermistor Ambient Plate Hex Liquid TH7 6 Thermistor Comp Surface TH33 Thermistor Inlet Water TH34 High pressure sw...

Page 57: ...o remove the cont base front The cont base front is fixed to the electrical parts box with a hook on the left side 5 Disconnect all the connectors on the noise filter circuit board 6 To remove the noise filter circuit board release it from the support 7 Remove the cont base fixing screws 3 for front 4 10 to remove the cont base The cont base is fixed to the electrical parts box with a hook on the ...

Page 58: ...er fixing screw 1 for rear 5 12 to remove the sensor holder 7 Pull out the thermistor Ambient TH7 from sensor holder Note 1 When replacing a thermistor Ambient TH7 replace it together with thermistor Plate Hex Liquid TH6 since they are combined together Refer to procedure No 6 to remove the thermistor Plate Hex Liquid TH6 Photo 7 8 Removing the thermistor Liquid TH3 1 Remove the nozzle of plate he...

Page 59: ...ve the terminal cover fixing screw of nut 1 for front M5 Photo 9 10 Removing the thermistor Inlet Water TH34 1 Remove the nozzle of plate heat exchanger for the water piping See Photo 14 2 Remove the service panel See Photo 1 3 Remove the top panel See Photo 1 4 Remove the cover panel front See Photo 3 1 5 Remove the side panel R See Photo 1 6 Disconnect the connector TH34 RD on the controller cir...

Page 60: ...welded part of 4 way valve 4 positions to remove the 4 way valve Removing the LEV 6 Remove the LEV coil 7 Loosen the LEV fixed to the pipe with a band and rubber mount 8 Remove the welded part of LEV 2 positions to remove the LEV Removing the high pressure switch 6 Disconnect the lead wire from the high pressure switch 7 Loosen the high pressure switch fixed to the pipe with a band and rubber moun...

Page 61: ...essor heat exchanger receiver and plate heat exchanger of piping 8 positions then slide the piping upward to remove it 12 Remove the compressor fixing nuts 3 for top M6 to remove the compressor Note 1 Recover water in the plate heat exchanger before removing the water piping Note 2 Recover refrigerant without spreading it in the air Note 3 Tighten the nuts of compressor with a torque of 4 0 4 N m ...

Page 62: ...te 1 Recover water in the plate heat exchanger before removing the water piping Note 2 Recover refrigerant without spreading it in the air Photo 14 16 Removing the reactor ACL1 ACL2 ACL3 Y model only 1 Remove the electrical parts box See Photo 3 1 2 Remove the reactor assy fixing screws 4 for right 4 10 then slide the reactor assy upward to remove it 3 Remove the reactor fixing screws 4 for front ...

Page 63: ...cable strap for the lead wire on the comp case front 6 Disconnect the connectors CNF1 WH TH3 WH TH4 WH TH7 6 RD TH33 YE TH34 RD 63H YE 63L RD 63HS WH 21S4 GN LEV A WH and LEV B RD from the controller circuit board Symbols on the board Fan motor CNF1 Thermistor Liquid TH3 Thermistor Discharge TH4 Thermistor Ambient Plate Hex Liquid TH7 6 Thermistor Comp Surface TH33 Thermistor Inlet Water TH34 High...

Page 64: ... to remove the cont base front The cont base front is fixed to the electrical parts box with a hook on the left side 5 Disconnect all the connectors on the noise filter circuit board 6 To remove the noise filter circuit board release it from the support 7 Remove the cont base fixing screws 3 for front 4 10 to remove the cont base The cont base is fixed to the electrical parts box with a hook on th...

Page 65: ...der fixing screw 1 for rear 5 12 to remove the sensor holder 7 Pull out the thermistor Ambient TH7 from sensor holder Note 1 When replacing thermistor Ambient TH7 replace it together with thermistor Plate Hex Liquid TH6 since they are combined together Refer to procedure No 6 to remove the thermistor Plate Hex Liquid TH6 Photo 7 8 Removing the thermistor Liquid TH3 1 Remove the nozzle of plate hea...

Page 66: ...istor Comp Surface TH33 from thermistor holder Photo 9 10 Removing the thermistor Inlet Water TH34 1 Remove the nozzle of plate heat exchanger for the water piping See Photo 14 2 Remove the service panel See Photo 1 3 Remove the top panel See Photo 1 4 Remove the cover panel front See Photo 3 1 5 Remove the side panel R See Photo 1 6 Disconnect the connector TH34 RD on the controller circuit board...

Page 67: ...l R See Photo 1 Removing the 4 way valve 6 Remove the 4 way valve coil 7 Remove the welded part of 4 way valve 4 positions to remove the 4 way valve Removing the LEV 6 Remove the LEV coil 7 Loosen the LEV fixed to the pipe with a band and rubber mount 8 Remove the welded part of LEV 2 positions to remove the LEV Removing the pressure switch 6 Disconnect the lead wire from the pressure switch 7 Loo...

Page 68: ... sor heat exchanger receiver and plate heat exchanger of piping 8 positions then slide the piping upward to remove it 12 Remove the compressor fixing nuts 3 for top M6 to remove the compressor Note 1 Recover water in the plate heat exchanger before removing the water piping Note 2 Recover refrigerant without spreading it in the air Note 3 Tighten the nuts of compressor with a torque of 4 0 4 N m P...

Page 69: ...e 1 Recover water in the plate heat exchanger before removing the water piping Note 2 Recover refrigerant without spreading it in the air Photo 14 16 Removing the reactor ACL1 ACL2 ACL3 Y model only 1 Remove the electrical parts box See Photo 3 1 2 Remove the reactor assy fixing screws 4 for right 4 10 then slide the reactor assy upward to remove it 3 Remove the reactor fixing screws 4 for front 4...

Page 70: ...ICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN CCopyright 2018 MITSUBISHI ELECTRIC CORPORATION Published Apr 2018 No OCH681 Made in Japan Specifications are subject to change without notice ...

Page 71: ... Homeowners Ecodan Homeowner Brochure Ecodan PUHZ Monobloc Air Source Heat Pump Product Information Sheet Ecodan PUHZ W85 112VAA Monobloc Air Source Heat Pump Product Information Sheet PUHZ W85 112VAA BS Installation Manual BH79D674K01 PUHZ W85 112VAA BS Parts List OCB681 PUHZ W85 112VAA BS Service Manual OCH681 PUHZ W85VAA BS Declaration of Conformity CE2018C03 ...

Page 72: ......

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Mitsubishi Electric PUHZ-W112VAA 11.2kW Mono, Service Manual

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