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Mitsubishi SRK100VNXWPZSX, Service Manual

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Mitsubishi SRK100VNXWPZSX Service Manual Download Page 166

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 165 

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'20 • PAC-SM-351

Error code

Remote control:

Content

1-time flash

Keeps flashing

Keeps flashing

–

–

Indoor display

RUN light

TIMER light

Green LED

Yellow LED

Red LED

Outdoor unit 

control PCB

Outdoor unit 

inverter PCB

Low pressure error or  

low pressure sensor anomaly (2/2) 

 

E49

1. Applicable model

5. Troubleshooting

All models

Diagnosis

Countermeasure

NO

YES

NO

YES

Is the 

service valve fully 

opened?

Are the 

connections of  low 

pressure sensor and suction pipe 

temprerature sensor 

connector OK?

NO

YES

NO

YES

Are the 

characteristics of 

low pressure sensor, suction 

pipe temperature 

sensor OK?

Is the low 

pressure normal during 

operation?

From previous page.

Open fully.

Correct connector.

Defective low pressure 

sensor, suction pipe 

 

temperature sensor

➞ 

Replace.

Charge refrigerant.

Defective outdoor unit 

control PCB

➞

Replace.

(Defective low pressure 

sensor, suction pipe 

temperature sensor circuits)

2. Error detection method

3. 

Condition of error displayed

4. Presumable cause

Note: 

Summary of Contents for SRK100VNXWPZSX

Page 1: ...type FDT140VNXWTVH 140VSXWTVH Triple type FDTC140VNXWTVH 140VSXWTVH HYPER INVERTER PACKAGED AIR CONDITIONERS Single type SRK100VNXWZR 100VSXWZR WALL MOUNTED TYPE Twin type SRK100VNXWPZSX 100VSXWPZSX 1...

Page 2: ...1 20 PAC SM 351 TABLE OF CONTENTS 1 HYPER INVERTER PACKAGED AIR CONDITIONERS 2 2 V MULTI SYSTEM 199...

Page 3: ...20 14 Cooling dehumidifying frost protection 21 15 Heating overload protection 21 16 Anomalous fan motor 21 17 Plural unit control Control of 16 units group by one remote control 22 18 High ceiling c...

Page 4: ...the outdoor control 40 1 Determination of comressor speed Frequency 40 2 Compressor start control 40 3 Compressor soft start control 41 4 Outdoor fan control 42 5 Defrost operation 44 6 Protective con...

Page 5: ...Troubleshooting flow 79 1 List of troubles 79 2 Troubleshooting 81 1 3 DISASSEMBLY PROCEDURE 172 1 Indoor units 172 2 Outdoor units 184 1 4 ELECTRICAL WIRING 186 1 Indoor units 186 2 Outdoor units 195...

Page 6: ...lighting can be changed If the backlight is ON setting when the screen is tapped while the backlight is turned off the backlight only is turned on Operations with switches and are excluded USB port US...

Page 7: ...e Cover AIR CON No button Display the indoor unit number connected to this remote control CHECK button This button is used at servicing TEST button This button is used during test operation Weekly tim...

Page 8: ...arts to operate and when this is pressed once again it stops operating MODE button Every time this button is pressed displays switch as below AUTO COOL HEAT FAN DRY TEMP button Change the set temperat...

Page 9: ...ts ON TIMER operation TIMER button This button is used for setting the current time and timer function ACL switch This switch resets the program to default state PROGRAM button This button sets WEEKLY...

Page 10: ...n sets NIGHT SETBACK operation Use this button to set the timer and Child Lock This button cancels the ON timer OFF timer and SLEEP operation 3D AUTO light green Illuminates during 3D AUTO operation T...

Page 11: ...aintenance Service password The selected screen is displayed The selected screen is displayed Service Maintenance 2 Special settings CPU reset Microcomputers of indoor unit and outdoor unit connected...

Page 12: ...items are saved in the memory of indoor unit g Weekly timer peak cut timer or silent mode timer settings h Remote control function setting Please check the I U Set clock first on the initializing scre...

Page 13: ...state of stop is memorized Although the timer mode is cancelled at the recovery from power failure the setting of weekly timer is changed to the holiday setting for all weekdays b Operation mode c Ai...

Page 14: ...ormed regardless of the temperature shown at right 3 3 Cooling operation Heating operation Room temperature detected with Thi A C 59 56 Heating operation stopped cooling Heating OK Indoor heat exchang...

Page 15: ...ating 2 Operations of functional items during cooling heating Cooling Heating Dehumidifying Fan Operation Functional item Thermostat ON Thermostat ON Thermostat OFF Thermostat OFF Hot start Defrost Co...

Page 16: ...d disabled iv Set ON timer by clock Set the time to start operation The time can be set in the unit of 5 minute This setting can be activated only once each time It is allowed also to set simultaneous...

Page 17: ...emperature sensor Thi R1 or R2 whichever higher detects 25 C or lower the fan is turned OFF and does not operate ii When the heat exchanger temperature sensor Thi R1 or R2 whichever higher detects 25...

Page 18: ...signal from the remote control If the auto swing signal is received from the remote control the auto swing will start from the position before the stop b RC E5 i Louver control 1 Press the LOUVER but...

Page 19: ...temperature sensors both Thi R1 and R2 detect 25 C or lower 2 Indoor fan OFF is fixed for 5 minutes After the 5 minutes the indoor fan is operated at ULo for 2 minutes In the meantime the louver is co...

Page 20: ...e fan on the indoor unit of which the thermostat has been turned OFF is turned OFF The same occurs also when the remote control sensor is effective As the operation time Total ON time of ON OFF switch...

Page 21: ...OFF releases the forced drain pump ON condition Normal state 1 2 Normal state Drain detection switch ON Stop 1 Indoor unit operation mode Control A Control B Compressor ON Compressor OFF Cooling Dry H...

Page 22: ...ops with the anomalous stop E16 b If the fan motor fails to reach at 50 min 1 FDU 500 min 1 less than the required speed it stops with the anomalous stop E20 Compressor forced off temperature FDT FDTC...

Page 23: ...unction operates that unit stops with the anomalous stop but any other normal units continue to run as they are e Signal wiring procedure Signal wiring between indoor and outdoor units should be made...

Page 24: ...nT CnT CnTA CnT CnTA Operation stop pulse CnT CnT CnT CnTA CnT CnT CnTA CnT CnTA Operationpermission prohibitionlevel CnT CnTA CnT CnTA CnT CnTA CnT CnT CnTA CnT CnTA Operation permission prohibition...

Page 25: ...mo OFF Unit goes thermo off 7 Temporary stop Refer to 22 Temporary stop input 8 Silent mode Outdoor unit silent mode is activated ii In case of Pulse input setting Local setting It is effective only w...

Page 26: ...F Operation Stop Operation permission 1 Operation prohibition Unit stops 1 Only the LEVEL INPUT is acceptable for external input however when the indoor function setting of Level input Factory default...

Page 27: ...peration and Stop commands are not accepted b In case of CnT Operation permission prohibition level CnTA Operation permission prohibition level Operation prohibition zone is determined by the OR judgm...

Page 28: ...s are inverted Cooling Heating or Heating Cooling d If the cooling heating selection signal is given by the external input the operation mode is transmitted to the remote control Selection of cooling...

Page 29: ...rature by the return air temperature sensor and the measured temperature after installing the unit a It is adjustable in the unit of 0 5 C with the wired remote control indoor unit function RETURN AIR...

Page 30: ...the return air temperature According to temperature difference between set temperature and return air temperature indoor fan tap are controlled automalically Auto 1 Changes the indoor fan tap within t...

Page 31: ...ain IU IU back up function Infrared sensor setting Previous Back Select the item Infrared motion sensor setting Select the item Infrared sensor setting Disable Enable Back Menu Direction Cooling 16 14...

Page 32: ...ours unit stops Compressor keeps stopped regardless of the set temperature Notes 1 When the following operations are set power saving control will be canceled Energy saving Home leave mode Warm up con...

Page 33: ...of operation 2 Auto restart function a b i ii 4 Custom cord switching procedure a Modifying the indoor printed circuit board b Modifying the wireless remote control i ii Cut Function Operation mode Ro...

Page 34: ...utton to operate the swing louver when the air conditioner is operating SWING is displayed for 3 seconds and then the swing louver moves up and down continuously 2 To fix the swing louver at a positio...

Page 35: ...patterns can be set for a day The day off setting is provided for holidays and non business days Note 1 It is necessary to set the clock to use the weekly timer vii Combination of patterns which can b...

Page 36: ...signal cannot be received from the indoor control with outdoor control having serial signals continues for 7 minutes and 35 seconds the compressor is stopped After the compressor has been stopped it...

Page 37: ...tective function operates that unit stops with the anomalous stop but any other normal units continue to run as they are d Signal wiring procedure Signal wiring between indoor and outdoor units should...

Page 38: ...te control Display 18 19 20 21 22 23 24 25 26 27 28 29 30 18 19 20 21 22 23 24 25 26 27 28 29 30 18 19 20 21 22 23 24 25 26 27 28 29 30 Setting temperature Cooling Heating SP 1 SP 1 Unit Keep operatio...

Page 39: ...speed Auto Me Upper limit of compressor s speed RangeA 50 rps RangeB 50 rps RangeC 30 rps Indoor fan Adaptable to compressor speed Hi Upper limit of compressor s speed RangeA 70 rps SRK60 80 rps Rang...

Page 40: ...an the vertical swing the flaps change to the horizontal position iii Reset conditions When either of the following conditions is satisfied 1 Compressor s command speed is less than 28 SRK100 20 rps r...

Page 41: ...ir temperature Tho A Unit rps Model FDC100 FDC125 FDC140 Max required frequency Outdoor air temperature is 18 C or higher 80 80 85 Outdoor air temperature is 10 C or higher 75 95 92 95 92 Note 1 Value...

Page 42: ...C rps 2 At 30 seconds after the compressor start the compressor s target frequency is changed to B rps and the compressor s operation frequency is fixed for 10 minutes Model Operation mode A rps B rp...

Page 43: ...temperature C 15 18 zone 32 34 zone 46 48 zone Outdoor heat exchanger temperature C 20 30 zone 33 zone 43 53 zone c Fan tap control during heating operation Fan taps are selected depending on the outd...

Page 44: ...ture Tho P D C present outdoor fan tap is maintained c When the power transistor radiator fin temperature Tho P D C the outdoor fan tap is dropped by 1 speed iv Ending conditions When the operation un...

Page 45: ...exchanger temperature sensor Tho R1 R2 and the outdoor air temperature sensor Tho A become lower than the defrost operation starting temperature as shown by the right figure for 15 seconds continuousl...

Page 46: ...ing value the compressor stops 2 When it is detected 2 times within 60 minutes or after continuous 30 minutes including the stop of compressor E36 is displayed on the remote control and it enters the...

Page 47: ...open state for 60 minutes continuously including the stop of compressor e Low pressure control i Protective control If the value detected by the low pressure sensor LPT exceeds the setting value the c...

Page 48: ...value and the compressor stops 4 times within 30 minutes E42 is displayed on the remote control and it enters the anomalous stop mode i Anomalous inverter PCB If the power transistor detects any anom...

Page 49: ...ressor ON the compressor stops After a delay of 3 minutes it restarts but if the same is detected repeatedly 3 times within 40 minutes the compressor stops with the anomalous stop Note 1 During defros...

Page 50: ...e is turned OFF a Control procedure i Close the service valve at the liquid side It is left open at the gas side ii Compressor is started with the target speed frequency at 45 rps in the cooling mode...

Page 51: ...detected with Tho A is 5 C or higher When the compressor stop has been detected for 30 minutes continuously In the cooling or dehumidifying mode Base heater ON Base heater OFF Outdoor air temperature...

Page 52: ...eeps flashing Stays OFF Keeps flashing Indoor return air temperature sensor Defective indoor return air temperature sensor defective element broken wire short circuit Poor contact of temperature senso...

Page 53: ...ive fan motor Replacement repair Replacement repair Indoor unit control PCB Defective indoor unit control PCB Replacement Stays OFF Keeps flashing Remote control temperature sensor Broken wire of remo...

Page 54: ...ays OFF Keeps flashing 1 time flash Keeps flashing 6 time flash Inverter PCB or radiator fin Power transistor overheat Replacement of PCB or Repair 116 Stays OFF Keeps flashing 1 time flash Keeps flas...

Page 55: ...l PCB Outdoor inventer PCB Location of trouble Description of trouble Repair method Reference page Error code Red LED RUN light TIMER light Red LED Green LED Yellow LED Keeps flashing Keeps flashing O...

Page 56: ...ted indoor units is detected after power ON Return air temperature sensor anomaly 50 C or lower is detected for 5 seconds continuously within 60 minutes after initial detection of this anomalous tempe...

Page 57: ...xchanger remote control switch limit switch transformer and fuse Note 1 With regard to parts of high voltage circuits and refrigeration cycle judge it according to ordinary inspection methods ii Instr...

Page 58: ...d PCB v Reconnect the all wirngs to the PCB that was removed in ii vi Rescrew the terminal Arrow A of the E1 wiring that was removed in i b Control PCB Parts mounting are different by the kind of PCB...

Page 59: ...mounting are different by the kind of PCB ON OFF Part number SW2 Blue Address setting SW5 Master Slave setting SW7 Function setting CNT Blue External switch CNJ White Louver motor CNN Yellow Thermist...

Page 60: ...tch Address SW2 Master Slave1 Slave2 Slave3 SW5 1 SW5 2 Content of control Plural indoor units control by 1 remote control Master Slave setting Test run SW7 1 Normal Operation check drain motor test r...

Page 61: ...3 White Terminal block CNM1 White Fan motor1 CNW1 White Control PCB CNW0 White Terminal block CNM2 Black Fan motor2 CNWR White Reactor Models FDUM60VH 71VH 100VH 125VH 140VH PSB012D993 This PCB is a g...

Page 62: ...d Fix the board such that it will not pinch any of the wires Reconnect the wirings to the PCB Wiring connector color should match with the color of connector of the PCB Screw back the terminal of wiri...

Page 63: ...alid Invalid Normal Invalid See table 2 Model selection As per model See table 1 Remark Address No setting at plural indoor units control by 1 R C 0 F Switch Description Default setting Master Slave s...

Page 64: ...ge connected for the power source With the power off do the flaps open manually then close again when the power is turned on Replace the indoor printed circuit board and perform an operation check Mak...

Page 65: ...25 20 15 10 5 30 20 10 40 50 60 70 0 10 Indoor fan motor error Broken sensor wire connector poor connection Defective fan motor connector poor connection defective indoor unit PCB 66 for the fan motor...

Page 66: ...65 20 PAC SM 351 Error of signal transmission Wiring error including power cable defective indoor outdoor unit PCB unit unit unit...

Page 67: ...rminal blocks and AC 220 230 240 V Indoor electrical components are normal Is the voltage between terminal blocks and oscillating between DC 0 and 20V Inspect power source for outdoor unit Replace fus...

Page 68: ...ndoor unit PCB Replace the indoor unit PCB and the fan motor Check then the operation Faulty part other than fan motor YES Fan motor is faulty YES YES YES NO NO NO Replace the faulty part and the fuse...

Page 69: ...n and reconfirming that voltage has been discharged sufficiently by measuring the voltage DC between both terminals of electrolytic capacitor C58 Measurment of voltage may be disturbed by the moisture...

Page 70: ...Match the setting switches SW3 5 JSW with the former PCB 5 Tighten up a screw after passing white wiring through CT1 of the changed 6 Connect the connectors with the control PCB referring to the part...

Page 71: ...PCB is incorrectly replaced it will cause an electric shock or fire Be sure to check that the power source for the outdoor unit is turned OFF before replacing the PCB The PCB replacement under current...

Page 72: ...n grease first on the surface of power transistor Make sure it is applied to prevent damage on power transistor 5 Tighten the screw of power transistor on inverter PCB and connect the terminal block C...

Page 73: ...Test run switch Normal Test run OFF Normal SW 3 4 Test run mode Normal Heating OFF Cooling SW 4 1 Silent mode setting Normal Silent OFF Normal See page 40 SW4 2 Model setting 3 phase Single phase As...

Page 74: ...nomaly operation data Corresponding data may not be provided depending on models Such items will not be displayed Operating procedure On the TOP screen touch the buttons in the order of Menu Service s...

Page 75: ...f inverter primary current P 47 f 4 High pressure protection control P 45 b i P 46 c i 5 High pressure anomaly P 45 b ii 6 Low pressure protection control P 46 e i 7 Low pressure anomaly P 46 e ii 8 A...

Page 76: ...ach te rminal P Power transistor P terminal N Power transistor N terminal U End of red harness to compressor V End of white harness to compressor W End of black or blue harness to compressor Check for...

Page 77: ...ove the terminal cover of compressor and disconnect the wires U V W from compressor 3 Connect the wires U Red V White and W Black of checker to the terminal of disconnected wires U V W from compressor...

Page 78: ...CNEEV2 CNFAN1 CNA1 CNI3 CNI1 18V 15V FMO1 M M M SM2 SM1 20S CNF OPTION DH CH1 THo R2 THo P THo A THo S THo D THo R1 Power source check Measure the power source L1 N It is normal if it is AC220 240V N...

Page 79: ...NF OPTION CNEEV1 CNEEV2 CNI2 CNW1 CNO1 CNE Power source check Measure the power source L1 L2 L3 It is normal if it is AC380 415V Models FDC100VSX 125VSX 140VSX Outdoor unit check points Check items wi...

Page 80: ...number of connected indoor units more than 17 units by controlling with one remote control 102 E11 Address setting error of indoor units 103 E14 Communication error between master and slave indoor un...

Page 81: ...omaly 147 None Room temperature sensor anomaly 148 E10 Excessive number of connected indoor units more than 17 units by controlling with one remote control 149 E14 Communication error between master a...

Page 82: ...YES NO NO Is the compressor operating NO YES NO Note 1 Outdoor 35 C Indoor 27 C 1 WAIT It is normal This unit is designed to start in the soft start mode by detecting the under dome temperature of co...

Page 83: ...NO YES NO Note 1 Outdoor 7 C Indoor 20 C 1 WAIT It is normal This unit is designed to start in the soft start mode by detecting the under dome temperature of compressor when it restart after power re...

Page 84: ...or when the unit has been left for long time without power source the insulation resistance may drop to a few M because of refrigerant migrated in the compressor When the earth breaker is activated a...

Page 85: ...the gap if necessary Prevent the vibration from transmitting to wall and etc by fixing pipes on the wall or wrapping rubber cushion around the pipe which goes through the hole in the wall or applying...

Page 86: ...f piping of air conditioner It is likely to occur particularly during cooling or defrost operation in the heating mode It is normal The noise vibration occurs when the refrigerant starts or stops flow...

Page 87: ...n of air nitrogen etc In such occasion it is necessary to recover refrigerant vacuum dry and recharge refrigerant Since there could be many causes of noise vibration the above do not cover all In such...

Page 88: ...Is LM locked Check at the indoor unit side LM louver motor Is the louver operable with the remote control YES NO Does the louver operate at the power on YES NO YES NO Operate after waiting for more th...

Page 89: ...ck of indoor unit NO YES NO Is AC380 415V for 3 phase unit detected between and on the teminal block of outdoor unit or isAC220 240V for 1 phase unit detected between and on the terminal block of outd...

Page 90: ...in the indoor terminal block exceed 15 VDC YES NO YES NO NO YES Does the voltage between X and Y in the indoor terminal block exceed 15 VDC Remove wire for the remote control Power source reset YES Co...

Page 91: ...e indoor and outdoor unit Power source reset NO YES YES NO NO NO NO NO YES YES YES Set one remote control for Master and the other for Slave YES Note 3 Only indoor unit with drain pump Set SW1 on remo...

Page 92: ...the power on with remote control 3 Condition of error displayed Same as above 4 Presumable cause Improper setting Surrounding environment Defective remote control communication circuit Faulty indoor...

Page 93: ...oor units YES YES NO Is approx DC20V detected between on the outdoor unit terminal block Is approx DC20V detected between on the indoor unit terminal block WAIT To next page Defective indoor unit cont...

Page 94: ...AC220 240V or AC380 415V detected at the noise filter secondary side Is fuse 250V 2A on the outdoor unit control PCB blown YES YES Is DC5V detected on the outdoor unit control PCB Between of CNV NO Y...

Page 95: ...source fuse Replace the inverter PCB Replace the reactor Replace the electrolytic capacitor NO Replace the power source fuse YES Is there a short circuit between phases of the noise filter Is there a...

Page 96: ...rolconnection terminals Is DC10V or higher detected on remote control wires if the remote control is removed Are wires connected properly between the indoor outdoor units YES Defective remote control...

Page 97: ...een indoor outdoor units Power source reset NO 1 Malfunction by noise Check peripheral environment Defective indoor unit control PCB Replace Move to E5 Communication error during operation Check 2 Err...

Page 98: ...r breakage of signal wires between indoor outdoor units YES NO YES NO YES NO In case that the outdoor unit red LED flashes 2 time Repair signal wires Repair signal wires To the diagnosis of WAIT Unit...

Page 99: ...at exchanger temperature sensor Replace Defective indoor unit control PCB Replace Defective indoor heat exchanger temperature sensor input circuit 2 Error detection method Anomalously low temperature...

Page 100: ...rect Connect connector Defective return air temperature sensor Replace Defective indoor unit control PCB Replace Defective return air temperature sensor input circuit 2 Error detection method Anomalou...

Page 101: ...gh Note 2 For characteristics of indoor heat exchanger temperature sensor see the error display E6 YES NO YES NO Error stop Reset Indoor heat exchanger temperature C 56 63 Wash Defective indoor heat e...

Page 102: ...pipe slop OK NO YES NO YES NO Check float switch Defective indoor unit control PCB Replace Defective indoor unit control PCB Replace Check option equipment Correct setting to Humidifier drain pump mo...

Page 103: ...FF 1 Applicable model 5 Troubleshooting Diagnosis Countermeasure Are more than 17 indoor units connected to one remote control NO YES Defective remote control Replace Reduce to 16 or less units 2 Erro...

Page 104: ...ddress by DIP switch SW2 on indoor unit control PCB 2 Error detection method IU address has been set using the Master IU address set function of remote control 3 Condition of error displayed Same as a...

Page 105: ...urce Note 1 Set DIP switches SW5 1 and SW5 2 as shown in the following table Factory default setting Master Master Slave a Slave b SW5 1 OFF OFF ON SW5 2 OFF ON OFF DIP switch Indoor unit YES NO NO YE...

Page 106: ...voltage Replace faulty fan motor and indoor unit control PCB Replace fan motor If the error persists after replacing the fan motor replace the indoor unit control PCB Malfunction by temporary noise 2...

Page 107: ...eshooting Diagnosis Countermeasure In cases of RC EX3A Menu Service setting IU settings Select IU In cases of RC E5 Return address No to IU using or button 2 Error detection method IU address has been...

Page 108: ...unit control PCB ON E19 occurs when the power ON NO YES Defective indoor unit control PCB Defective SW7 Replace Turn SW7 1 on the indoor unit control PCB OFF and reset the power 2 Error detection meth...

Page 109: ...e fan motor Check power voltage Replace faulty fan motor and indoor unit control PCB Replace fan motor If the error persists after replacing the fan motor replace the indoor unit control PCB Malfuncti...

Page 110: ...3 minute delay the compressor starts again automatically but if this error occurs again within 60 minutes after the initial detection 4 Presumable cause Faulty connection of remote control temperature...

Page 111: ...perature sensor Check unit side Isn t the air circulation of outdoor unit short circuited Are installation spaces adequate Isn t there any fouling or clogging on heat exchanger Control operation check...

Page 112: ...unit side Isn t filter clogged Are indoor outdoor unit installation spaces adequate Isn t there any short circuit of air Isn t there any fouling clogging on indoor heat exchanger 2 Error detection met...

Page 113: ...anomalously low temperature resistance on the outdoor heat exchanger temperature sensor 3 Condition of error displayed When the temperature sensor detects 50 C or lower for 5 seconds continuously wit...

Page 114: ...k Correct connector Defective outdoor air temperature sensor Replace Defective outdoor unit control or main PCB Replace Defective outdoor air temperature sensor input circuit 2 Error detection method...

Page 115: ...nput circuit 2 Error detection method Detection of anomalously low temperature resistance on the discharge pipe temperature sensor 3 Condition of error displayed When the temperature sensor detects 10...

Page 116: ...must be reset NO Open the service valve Correct 63H1 connector Correct electronic expansion valve connector Defective outdoor unit control or main PCB Replace Defective 63H1 input circuit 2 Error det...

Page 117: ...ection method When less than DC14V of the output voltage is detected between and on CNI3 E41 is displayed See Note mentioned below 3 Condition of error displayed Seme as above 4 Presumable cause Inver...

Page 118: ...urce Open the service valves Check refrigerant amount and refrigerant circuit In case of transitional increase of high pressure and or test run several times restarting may recover it because liquid r...

Page 119: ...pe temperature sensor normal Is there any anoumalous sound on the compressor YES YES From previous page Defective inverter or outdoor unit main PCB Replace Defective inverter or outdoor unit main PCB...

Page 120: ...anomalous conditions the voltage becomes less than DC14V Is DC15V detected between and on CNI3 Is DC15V detected after disconnecting outdoor fan motor YES YES NO Correct the connection Set JSW10 11 c...

Page 121: ...After 3 minute delay it starts again automatically but if this anomaly occurs 5 times within 60 minutes after the initial detection 4 Presumable cause Defective outdoor unit control PCB Foreign mater...

Page 122: ...pressure drop and suction superheat 3 Condition of error displayed When the low pressure sensor detects 0 079MPa or lower for 15 seconds continuously compressor stops and it restarts automatically af...

Page 123: ...m previous page Open fully Correct connector Defective low pressure sensor suction pipe temperature sensor Replace Charge refrigerant Defective outdoor unit control PCB Replace Defective low pressure...

Page 124: ...ediately the inverter PCB and the power transistor Note 1 Under anomalous conditions the voltage becomes less than DC14V Note 2 How to check the voltage between and of CNI3 Replace inverter PCB If not...

Page 125: ...n pipe temperature sensor input circuit 2 Error detection method When the suction pipe temperature sensor detects anomalously low temperature 3 Condition of error displayed If the temperature sensor d...

Page 126: ...on method When anomalous voltage pressure is detected 3 Condition of error displayed If the pressure sensor detects DC0V or lower and DC4 0V or higher for 5 seconds continuously within 2 minutes to 2...

Page 127: ...s 2 Error detection method Judge insufficient refrigerant amount by detecting the temperature differnce between indoor heat exchanger Thi R and indoor return air Thi A It detects at initial startup in...

Page 128: ...ror displayed If the compressor fails to startup for 20 times 10 patterns 2 times continuously 4 Presumable cause Outdoor fan motor anomaly Outdoor unit control PCB anomaly Inverter PCB anomaly Anomal...

Page 129: ...inverter output OK Check by inverter checker Does it start NO YES YES YES Note 1 Several times restarting may recover it because liquid refrigerant migrated in the compressor could be discharged from...

Page 130: ...YES YES NO NO Is the compressor operating NO YES NO Note 1 Outdoor 35 C Indoor 27 C 1 WAIT It is normal This unit is designed to start in the soft start mode by detecting the under dome temperature of...

Page 131: ...compressor operating NO YES NO Note 1 Outdoor 7 C Indoor 20 C 1 WAIT It is normal This unit is designed to start in the soft start mode by detecting the under dome temperature of compressor when it r...

Page 132: ...is activated at lower insulation resistance check the following points 6 hours after power ON check if the insulation resistance recovers to normal When power ON crankcase heater heat up compressor an...

Page 133: ...xing pipes on the wall or wrapping rubber cushion around the pipe which goes through the hole in the wall or applying other appropriate means Strength of ceiling wall floor etc may be insufficient Rev...

Page 134: ...efrost operation in the heating mode It is normal The noise vibration occurs when the refrigerant starts or stops flowing It is normal When the defrost operation starts or stops during heating the ref...

Page 135: ...um dry and recharge refrigerant Since there could be many causes of noise vibration the above do not cover all In such case check the conditions when where how the noise vibration occurs according to...

Page 136: ...l YES NO Does the louver operate at the power on YES NO YES NO Operate after waiting for more than 1 minute Repair wiring Defective indoor unit control PCB Replace Replace LM Normal Adjust LM lever an...

Page 137: ...or isAC220 240V for 1 phase unit detected between 1 and 2 on the terminal block of outdoor unit YES Defective outdoor unit control PCB Noise filter Replace Misconnection or breakage of connecting wire...

Page 138: ...ES NO Disconnect connecting wires Is DC15V or higher detected between X Y of indoor unit terminal block YES NO NO Correct Insert connector securely Replace wires Replace remote control Replace interfa...

Page 139: ...pushing the limit switch by finger when the inlet panel is removed YES Correction re set Defective limit switch Replace Defective indoor unit control PCB Replace Defective limit switch input circuit...

Page 140: ...0V detected between on the remote control terminal block YES YES NO NO Set SW1 on remote control PCB at Master Nomal Set address again SW3 on interface kit PCB Separate remote control wires from high...

Page 141: ...nment Defective remote control communication circuit Faulty indoor unit control PCB Faulty outdoor unit control PCB Faulty interface kit PCB Note If any error is detected 30 minutes after displaying W...

Page 142: ...ox DC20V detected between on the indoor unit terminal block WAIT To next page Defective indoor unit control PCB Replace Defective remote control Replace Broken remote control wire X or Y Replace Corre...

Page 143: ...or unit control PCB blown YES Is DC5V detected on the outdoor unit control PCB Between of CNV NO YES Is DC5V detected if the connector of outdoor unit fan motor is disconnected NO Is DC255 310V detect...

Page 144: ...Replace the power source fuse YES Is there a short circuit between phases of the noise filter Is there a short circuit between phases of inverter PCB input terminals Is there any crack burning on the...

Page 145: ...detected on connecting wires if the interface kit is removed Are wires connected properly between the indoor outdoor units YES Defective remote control Defective remote control Defective interface ki...

Page 146: ...Check peripheral environment Defective remote control Defective remote control Defective interface kit Defective interface kit Defective connecting wire Defective remote control wire Short circuit et...

Page 147: ...e outdoor unit red LED flashes 2 time Repair signal wires Repair signal wires To the diagnosis of WAIT Unit is normal Malfunction by temporary noise etc Defective outdoor unit control PCB Defective ne...

Page 148: ...ontrol PCB Replace Defective indoor heat exchanger temperature sensor input circuit 2 Error detection method Anomalously low temperature or high temperature resistance is detected on the indoor heat e...

Page 149: ...r unit control PCB Replace Defective room temperature sensor input circuit 2 Error detection method Anomalously low temperature or high temperature resistance is detected by indoor room temperature se...

Page 150: ...connected to one remote control NO YES Defective remote control Replace Reduce to 16 or less units 2 Error detection method When it detects more than 17 of indoor units connected to one remote contorl...

Page 151: ...aster Master Slave1 Slave2 SW3 1 OFF OFF ON SW3 2 OFF ON OFF Dip switch Interface kit YES NO NO YES Correct unit address setting Correct wiring Correct wiring Defective indoor unit control PCB Replace...

Page 152: ...PCB Replace fan motor If the error persists after replacing the fan motor replace the indoor unit control PCB Malfunction by temporary noise 2 Error detection method Detected by rotation speed of ind...

Page 153: ...n 60 minutes after the initial detection 4 Presumable cause Faulty connection of remote control temperature sensor Defective remote control temperature sensor Defective remote control PCB Note After 1...

Page 154: ...n check Defective outdoor unit control PCB Replace Excessive refrigerant amount Recharge refrigerant by weighing proper amount on a scale 2 Error detection method For the error detection method refer...

Page 155: ...ide Isn t filter clogged Are indoor outdoor unit installation spaces adequate Isn t there any short circuit of air Isn t there any fouling clogging on indoor heat exchanger 2 Error detection method Fo...

Page 156: ...lously low temperature resistance on the outdoor heat exchanger temperature sensor 3 Condition of error displayed When the temperature sensor detects 50 C or lower for 5 seconds continuously within 2...

Page 157: ...ure resistance on outdoor air temperature sensor 3 Condition of error displayed When the temperature sensor detects 45 C or lower for 5 seconds continuously within 2 minutes to 2 minutes 20 seconds af...

Page 158: ...ature sensor input circuit 2 Error detection method Detection of anomalously low temperature resistance on the discharge pipe temperature sensor 3 Condition of error displayed When the temperature sen...

Page 159: ...er source must be reset NO Open the service valve Correct 63H1 connector Correct electronic expansion valve connector Defective outdoor unit control PCB Replace Defective 63H1 input circuit 2 Error de...

Page 160: ...PCB as well 2 Error detection method When less than DC14V of the output voltage is detected between and on CNI3 E41 is displayed See Note mentioned below 3 Condition of error displayed Same as above...

Page 161: ...ge Check power source Open the service valves Check refrigerant amount and refrigerant circuit In case of transitional increase of high pressure and or test run several times restarting may recover it...

Page 162: ...ensor and suction pipe temperature sensor normal Is there any anoumalous sound on the compressor YES YES From previous page Defective inverter PCB Replace Defective inverter PCB Replace 2 Error detect...

Page 163: ...2 Under anomalous conditions the voltage becomes less than DC14V Is DC15V detected between and on CNI3 Is DC15V detected after disconnecting outdoor fan motor YES YES NO Correct the connection Set JSW...

Page 164: ...cted by rotation speed of outdoor fan motor 3 Condition of error displayed When actual rotation speed of outdoor fan motor FMo1 2 drops to 100min 1 or lower for 30 seconds continuously the compressor...

Page 165: ...ow pressure drop and suction superheat 3 Condition of error displayed When the low pressure sensor detects 0 079MPa or lower for 15 seconds continuously compressor stops and it restarts automatically...

Page 166: ...fully opened Are the connections of low pressure sensor and suction pipe temprerature sensor connector OK NO YES NO YES Are the characteristics of low pressure sensor suction pipe temperature sensor...

Page 167: ...CB If not solved replace noise filter PCB as well Replace outdoor fan motor Replace outdoor unit control PCB If not solved replace inverter PCB as well 2 Error detection method When power transistor a...

Page 168: ...rature sensor input circuit 2 Error detection method When the suction pipe temperature sensor detects anomalously low temperature 3 Condition of error displayed If the temperature sensor detects 50 C...

Page 169: ...tion method When anomalous voltage pressure is detected 3 Condition of error displayed If the pressure sensor detects DC0V or lower and DC4 0V or higher for 5 seconds continuously within 2 minutes to...

Page 170: ...detection method Judge insufficient refrigerant amount by detecting the temperature differnce between indoor heat exchanger Th2 and indoor room Th1 It detects at initial startup in cooling or dehumidi...

Page 171: ...or displayed If the compressor fails to startup for 20 times 10 patterns 2 times continuously 4 Presumable cause Faulty outdoor fan motor Faulty outdoor unit control PCB Faulty inverter PCB Anomalous...

Page 172: ...be discharged from the compressor After power OFF turn SW10 4 of inverter PCB ON and connect the inverter checker Then power ON again Try to restart several times From previous page Replace inverter...

Page 173: ...nsor holder DISASSEMBLY PROCEDURE PROCEDURE PICTURES FDT series PJF012D045 1 1 3 DISASSEMBLY PROCEDURE 1 Indoor units a FDT series PJF012D045 Precautions for safety Read these Precautions for safety c...

Page 174: ...e it mark 3 Remove 3 heat exchanger assembly xing screws and remove it mark 8 To remove the Electronic Expansion Valve EEV 1 Remove the heat exchanger assembly See No 7 2 Remove the coil of EEV by pul...

Page 175: ...ntrol box See No 1 2 Pull o all the inserted connectors 3 Take o 6 xing hooks then remove the PCB 3 To remove the impeller and motor FM 1 Remove 4 bellmouth xing screws then remove the bellmouth mark...

Page 176: ...ain pan See No 4 2 Remove 2 pipe lid xing screws then remove the pipe lid mark 3 Remove the fan motor wiring from clip and grommet mark 4 Remove 3 heat exchanger assembly xing screws then remove the h...

Page 177: ...ontrol PCB 3 Take o 4 control PCB xing locking supports mark and remove it Power PCB 4 Take o 6 power PCB xing locking supports mark and remove it 3 To remove the bottom panel B 1 Remove 18 panel xing...

Page 178: ...m panel B See No 3 2 Remove 22 bottom panel F xing screws and remove it mark 3 Remove 2 drain pan xing screws and remove it mark 4 Remove 4 heat exchanger assy xing screws and remove it mark 9 To remo...

Page 179: ...e 4 wire xing screws mark 3 Remove 4 air inlet grille xing screws mark 2 To remove the lid of control box 1 To remove air inlet grille See No 1 2 Remove 2 wire xing screws and remove it mark 3 Remove...

Page 180: ...ssy xing screws and remove it mark 9 To remove the louver motor LM 1 Remove the lid of control box See No 1 2 Disconnect the louver motor connector CNJ on PCB in control box 10 To remove the temperatu...

Page 181: ...180 20 PAC SM 351 1 e SRK series PHA012D402...

Page 182: ...181 20 PAC SM 351 Screw...

Page 183: ...182 20 PAC SM 351 3 PHA012D402...

Page 184: ...183 20 PAC SM 351 4 PHA012D402...

Page 185: ...ouble spanners are needed 5 To remove the electronic expansion valve EEV 1 Remove the service panel See No 1 2 Disconnect the EEV connector CNEEVx on PCB in control box 3 Remove the coil of EEV by pul...

Page 186: ...inserted connectors of control PCB Pic 3 Take o 6 control PCB xing locking support and remove it mark Pic 4 Remove 5 plate xing screws and open it mark Pic 5 Pull o all the inserted connectors of inv...

Page 187: ...4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 BK BK BK BK BK BK BK BK BK BL RD BR OR WH YE GN RD 12 12 12 3 Power source line Signal line 1 2 3 CNW3 WH 1 3 WH BL...

Page 188: ...7 18 19 20 BL RD BR OR WH 12 12 2 0A YE GN BK BK RD WH LM4 LM1 LM2 LM3 M M 1 M M 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 M M 1 M M BK 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 BK BK BK BK BK BK BK BK BK WH...

Page 189: ...1 2 FS Float switch Indication lamp Red Inspection Indication lamp Green Normal operation LED 3 LED 2 Connector CNB Z Model capacity setting SW6 Operation check drain pump motor test run SW7 1 SW5 Tem...

Page 190: ...WH Power PCB Power circuit BL or BK BR or WH WH or BL OR or YE 1 BL 3 1 WH CNW3 WH 1 2 WH RD YE GN 3 5 CNW0 WH 1 3 YE GN TB1 F1 3 15A L CNWR2 WH BK F2 3 15A Earth The line between 2 1 3 Power source l...

Page 191: ...Prepare on site Power PCB Power circuit 1 Earth The line between 2 1 3 Power source line Signal line indoor unit and outdoor unit M 1 4 5 6 7 F4 2A CNM2 BK RD BL or BK BR or WH WH or BL OR or YE BL 3...

Page 192: ...The line between 2 1 3 Power source line Signal line indoor unit and outdoor unit M 1 4 5 6 7 F4 2A CNM2 BK RD BL or BK BR or WH WH or BL OR or YE BL 3 1 WH CNW3 WH 1 2 WH RD YE GN 3 5 CNW0 WH 1 3 TB1...

Page 193: ...10 11 12 13 14 15 16 17 18 19 20 CNJ WH BL PK BR OR RD 12 1 PIS CNG BL CNV2 BK 2 4 3 1 3 Option WH BK RD WH RD BK WH RD BK WH RD BK CNL1 WH CNL2 WH Prepare on site CNZ CNC For HA WH RD SW2 SW6 SW5 SW7...

Page 194: ...MOTOR LOUVER RIGHT MOTOR LOUVER RIGHT LOWER MOTOR FLAP UPPER MOTOR FLAP LEFT MOTOR INLET RIGHT MOTOR INLET SW LIMIT PANEL INLET MOTOR FAN STACK DIODE 1 3 EXCHANGER HEAT EXCHANGER HEAT Power source 1...

Page 195: ...TED SM 1 LM 1 CNX M M M 5 5 LM 2 RD WH RD WH BK BL Y Y G BK CNG CNE DISPLAY WIRELESS RECEIVER CNF BACK UP SW 2 8 Th2 1 Th2 2 Th1 Th3 CNY Y G CNM 5 Color Marks Blue Black BK Red BL RD White WH Yellow G...

Page 196: ...and heating trial operation when SW3 4 is ON M GN Lower noise silent mode speed becomes lower in silent mode Upper limit of compressor speed and fan High height difference unit by 30m or more installe...

Page 197: ...CNA2 WH CNI2 WH CNO1 RD CNR WH GN BK RD BL RD G K R5 4 6 P N CNW2 WH CNW1 WH BK WH RD BL R3 R4 C1 C2 WH RD L RD BL RD BL RD BK TB5 TB6 IPM PCB2 52C 1 3 2 4 BK RD BL BK BK THo R2 t CNB RD 52X6 CN1 CN2...

Page 198: ...2 Twin type Models 100 125 140 Temperature sensor Return air Thi A or Th1 Temperature sensor Heat exchanger Thi R3 or Th22 Temperature sensor Heat exchanger Thi R2 or Th21 Heat exchanger Indoor unit...

Page 199: ...rature sensor Heat exchanger Thi R3 or Th22 Heat exchanger Thi R1 Temperature sensor Heat exchanger Indoor unit Indoor unit Indoor unit Flare connecting Gas branch pipe Flare connecting Diameter joint...

Page 200: ...199 20 PAC SM 351 2 V MULTI SYSTEM CONTENTS 2 1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 200 2 2 MAINTENANCE DATA 200 2 3 DISASSEMBLY PROCEDURE 200 2 4 ELECTRICAL WIRING 200 2 5 PIPING SYSTEM 200...

Page 201: ...AC SM 351 2 1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER See page 5 2 2 MAINTENANCE DATA See page 51 2 3 DISASSEMBLY PROCEDURE See page 172 2 4 ELECTRICAL WIRING See page 186 2 5 PIPING SYSTEM See...

Page 202: ...e reserve the right to make changes in all specifications without notice INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR CONDITIONERS Copyright MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS LTD Because of ou...

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