York DHM42CMB21S Service Manual Download Page 74

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Assemble the disassembled main parts as per the reverse

disassembly order mentioned above

Assemble the disassembled main parts as per the
reverse disassembly order mentioned above and
energize the unit for trial test.

Steps

Procedure

Steps

Procedure

1. Disconnect the power cord

2. Disassemble the pipeline connected with compressor

Disconnect the pipeline connected with compressor.

Disassembly and Assembly of Compressor

Remark: Make sure that there is no refrigerant in pipe system and the power supply is cut off before disassembling the compressor.

①

Remove the

securing

screws on the power

cord by

using a screwdriver.

②

Draw out the power cord

Note:
Please note the color of each power cord and also
the corresponding terminal number when removing
the power cord in case of misconnection.

Note the color of
each power cord
and also the
corresponding
terminal

Summary of Contents for DHM42CMB21S

Page 1: ...IR CONDITIONING UNITS READ AND UNDERSTAND THIS MANUAL BEFORE USING THIS INVERTER DRIVEN AIR CONDITIONING UNIT KEEP THIS MANUAL FOR FUTURE REFERENCE OUTDOOR UNIT DHM18CMB21S DHM24CMB21S DHM30CMB21S DHM...

Page 2: ...advanced information to maintain and service this inverter driven cooling or heat pump air conditioning unit which you operate as well for other models This inverter driven cooling or heat pump air c...

Page 3: ...8 5HPRYDO 3URFHGXUH 51 8 5HPRYDO 3URFHGXUH 58 8 5HPRYDO 3URFHGXUH 64 SSHQGL 71 Appendix 1 Resistance Table of Ambient Temperature Sensor 71 Appendix 2 Resistance Table of Tube Temperature Sensors 72...

Page 4: ...rrectly injuries may occur due to a falling unit Use appropriate Personal Protective Equipment PPE such as gloves and protective goggles and where appropriate have a gas mask nearby Also use electrica...

Page 5: ...ure the condensate hose discharges water properly If connected incorrectly it may cause leaks Do not install the unit in any place where oil can seep onto the units such as table or seating areas in r...

Page 6: ...on Controls Johnson Controls uses only refrigerants that have been approved for use in the unit s intended home country or market Johnson Controls distributors similarly are only authorized to provide...

Page 7: ...as and liquid valves otherwise these devices will be damaged It is closed before shipment If the arrangement for outdoor units is incorrect it may cause flowback of the refrigerant and result in failu...

Page 8: ...el to the indoor or outdoor units without turning OFF the main power supply After ceasing operation be sure to wait at least five minutes before turning off the main power switch Otherwise water leaka...

Page 9: ...2XWGRRU 8QLW DHM24CMB21S DHM30CMB21S DHM42CMB21S DHM36CMB21S DHM18CMB21S 1 Units and Features...

Page 10: ...HUORDG 3URWHFWRU 7KURWWOLQJ 0HWKRG 6WDUWLQJ 0HWKRG RROLQJ RUNLQJ 7HPS 5DQJH HDWLQJ RUNLQJ 7HPS 5DQJH RQGHQVHU 3LSH LDPHWHU RLO OHQJWK O KHLJKW FRLO ZLGWK DQ 0RWRU 6SHHG USP 0 2XWSXW RI DQ 0RWRU DQ 0RW...

Page 11: ...XEH PP PP USP P K LDO RZ LDO RZ LDO RZ PP XWRPDWLF HIURVWLQJ XWRPDWLF HIURVWLQJ XWRPDWLF HIURVWLQJ 7 7 7 RPSUHVVRU 0RGHO RPSUHVVRU 2LO RPSUHVVRU 7 SH 5 RPSUHVVRU 5 RPSUHVVRU 3RZHU QSXW 2YHUORDG 3URWHF...

Page 12: ...QVWUuFWLRQ 9LHZV 35 4 32 37 1 4 27 18 32 15 19 32 13 14 32 22 1 16 14 1 2 RQVWUXFWLRQ 9LHZV 8QLW inch 35 3 32 32 3 32 23 15 32 14 7 8 12 7 16 13 1 2 21 21 32 8QLW inch DHM18CMB21S DHM24CMB21S DHM30CMB...

Page 13: ...RQVWUuFWLRQ 9LHZV 5 DHM42CMB21S DHM36CMB21S 8QLW inch 8QLW inch 16 13 16 39 1 8 36 7 32 24 1 32 14 9 16 31 1 16 15 9 16 40 42 13 16 24 27 32 17 5 16 14 1 4 15 25 32 43 14 32...

Page 14: ...K model C2 C3 D3 D2 B3 B2 A2 A3 A1 A unit electronic expansion valve B1 B unit electronic expansion valve C1 C unit electronic expansion valve D1 D unit electronic expansion valve A2 A unit gas pipe t...

Page 15: ...the outdoor unit to exchange heat with the outdoor air and then is turned into refrigerant liquid After passing through the metering device the temperature and pressure of the refrigerant liquid will...

Page 16: ...2 5 1 97 9 2 7 2 25 1 DHM18CMB21S GY GRAY COMP YEGN YELLOW GREEN BN BROWN BU BLUE BK BLACK RD RED YE YELLOW WH WHITE 4YV than 30V to prevent the risk of electrical shock of terminal P DC and N DC at A...

Page 17: ...XT1 2 XTA XTB L N N1 L N E PE N2 3 3 2 terminal when the and N DC at AP1 is voltage of terminal P DC Please don t touch any WARNING higher than 30V to prevent the risk of electrical shock WARNING 2 3...

Page 18: ...U V W 3 OFAN 4YV 4V1 HEAT EH 20K 20K 20K 20K 20K 20K 20K 20K TUBE A TUBE B TUBE C TUBE D EKV2 EKV3 EKV4 RT6 RT7 RT8 RT9 RT10 RT11 RT12 RT13 W1 W2 W3 W4 W5 W6 W7 W8 W9 W10 W11 W14 W15 W16 W17 W19 W20 W...

Page 19: ...re sensor 6 Compressor electric heater 7 Outdoor fan 8 4 way valve 9 Chassis electric heater reserved 10 Unit A electronic expansion valve 11 Unit B electronic expansion valve 12 Communication interfa...

Page 20: ...f electronic expansion valve B 15 Interface of electronic expansion valve C 16 Interface of electronic expansion valve D 17 Communication wire interface 18 Communication neutral wire interface 19 20 I...

Page 21: ...LRQ 2YHUORDG SURWHFWLRQ 7HPSHUDWXUH VHQVRU 7HPSHUDWXUH VHQVRU XPSHU FDS OHFWURQLF H SDQVLRQ YDOYH HOORZ DQG ZKLWH ZLUHV RI 3 LQGXFWLRQ RPSUHVVRU ZLUH URZQ DQG EOXH ZLUHV RI 3 LQGXFWLRQ KDVVLV HOHFWULF...

Page 22: ...TUBE E Terminals of tube temperature sensor 16 HEAT Teminals of compressor band heater 17 L1 1 Terminals of reactor s brown wire 6 OVC COMP Terminals of overload protector 7 LPP Terminals of low press...

Page 23: ...5 6FKHPDWLF LDJUDP 27720 9...

Page 24: ...d for at least 80 seconds When the quantity of running indoor units is changed the unit will enter the control described in 1 3 5 1 and 1 3 5 2 When the compressor stops the outdoor fan runs at presen...

Page 25: ...conflict Cooling mode dry mode is in conflict with heating mode b Fan mode is in conflict with heating mode and the heating mode is the basic mode No matter which indoor unit operates first the unit w...

Page 26: ...t protection error code The error code will be cleared after 1 minute the unit will restart and then detect if there is still phase lock out protection If the phase lock out protection is detected con...

Page 27: ...e to cooling mode or dehumidification mode the entire system will stop first then restart under the UHTXLUHG PRGH H HIURVWLQJ IXQFWLRQ KHQ WKH GHIURVWLQJ FRQGLWLRQ LV met WKH ZD YDOYH de energizes and...

Page 28: ...UHG RQ DQG UXQV XQGHU WKH 22 PRGH LW LV possible ZLWKLQ 5 PLQXWHs WR JR WKH UHIULJHUDQW UHFRYHU PRGH E SUHVVLQJ WKH 7 EXWWRQ RQ WKH ZLUHOHVV zone FRQWUROOHU three times LQ WKUHH VHFRQGV ZLWK R GLVSOD...

Page 29: ...protection 22 Complete unit frequency dropping protection 23 Unit A frequency restriction or frequency dropping protection 24 Unit B frequency restriction or frequency dropping protection 25 Unit C f...

Page 30: ...57 Unit C communication wire misconnection or expansion valve malfunction 58 Unit D communication wire misconnection or expansion valve malfunction 1 IPM protection malfunction Main checking point If...

Page 31: ...nit to operate Test the resistance between the three phases Reconnect the wire of the compressor according to the correct wiring method If the resistance is normal If the resistance is above 500M Repl...

Page 32: ...d well and if the induction is broken Flow chart Start Check If the power supply is normal Power supply is abnormal yes yes yes no no no Check if the outdoor induction is broken The induction is broke...

Page 33: ...tweenthetwo ends of the electrolytic capacitor with the DC shift of the universal meter The voltage is above 100V yes yes yes no no no The detection circuit of the outdoor mainboard has malfunction Re...

Page 34: ...art Start If the outdoor ambient temperature is above 53 yes yes yes no no no It is a normal protection please operate the unit after the outdoor ambient temperature has changed If the indoor and outd...

Page 35: ...ction Check whether the temperature senspr is normal according to resistance table Replace the temperature sensor with the same model Replace the controller with the same model End Eliminate the malfu...

Page 36: ...3min no no no no no no yes yes yes yes yes yes If the connection wire of the compressor is connected well and correctly Eliminate the malfunction Reconnecttheconnectionwire ofthecompressoraccording to...

Page 37: ...n malfunction of some indoor units De energize check the connection wire of indoor and outdoor unit and the wire of the eletric box is connected correctly no no no Connected correctly Reconnect accord...

Page 38: ...d correctly Connected correctly Reconnect according to the wiring diagram Connected correctly Reconnect according to the wiring diagram De energize check if the connection wire between the outdoor mai...

Page 39: ...1k If the wiring of the eletric expansion valve is coonected well Replace the overload protector Check the coil of the eletric expansion valve replace it if it is broken Eliminate the malfunction Rec...

Page 40: ...ate the malfunction Eliminate the malfunction Eliminate the malfunction Replace the compressor End no no no no no no yes yes yes yes yes yes Replace outdoor mainboard The unit appears desynchronizing...

Page 41: ...ntroller Opened door and window Close the door and window Direct sunlight Hang a curtain or blinds over the window Too many people in the room Too many heat sources in the room Reduce the heat sources...

Page 42: ...of the electronic expansion valve The unit swishes during the cooling operation It is the sound when the refrigerant gas runs inside the unit r o d e t r a t s s i t i n e h w s e h s i w s t i n u e...

Page 43: ...ror Hc Flash 6 times Hc Hc Drive Error Startup Failure Lc Flash 11 times Lc Lc Drive Error DC Fan Motor Error LA Outdoor Phase Loss Ld Flash 3 times Flash 3 times Flash 3 times Ld Ld Drive Error Compr...

Page 44: ...t pipe outlet temperature sensor error See Table 16 Flash 22 times b7 b7 Indoor Liquid Valve Unit n indoor pipe inlet temperature sensor error See Table 16 Flash 19 times b5 b5 Indoor See Table 16 Fla...

Page 45: ...imes LA LA Outdoor Phase Loss Ld Ld Ld Drive Error Compressor Stalling LE LE LE Drive Error Over Speed LF LF LF Drive Error IPM Reset P0 P0 P0 Drive Error Compressor Current Protection P5 Flash 15 tim...

Page 46: ...re sensor error 24 Unit B indoor pipe inlet temperature sensor error 34 Unit C indoor pipe inlet temperature sensor error 15 Unit A indoor ambient temperature sensor error 25 Unit B indoor ambient tem...

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Page 48: ...or unit mainboard Replace pressure switch Check if operation mode of indoor unit is properly set N N Y Y Y Y Check if gas valve and liquid valve are completely open Refer to Instruction Manual of indo...

Page 49: ...un Check if swing louver of indoor unit is completely open Check if there is filth blockage to indoor outdoor filter or heat exchange fin System pipeline is blocked Mainly check the inlet and outlet o...

Page 50: ...Replace the outdoor unit mainboard Replace relevant discharge temperature sensor Discharge temperature protection Malfunction Display E5 Compressor Overheat N Y Y Y Y Y N N N Check if compressor s con...

Page 51: ...ck if the condensate pipe is jammed or if water flows smoothly Y Clear the water from pipe Adjust water drainage in pipe Check if the voltage of water drainage pump end is ok Full Water Protecti on Ma...

Page 52: ...is ok Replace mainboard of the indoor uint Replace temperature sensor Check the direction of the plug and socket Malfunction Display F5 Failure of Exhaust Temp Sensor N N Y Y Y Failure of Exhaust Temp...

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Page 62: ...wrench WR UHPRYH WKH IDQ EODGH 5HPRYH WKH WDSSLQJ VFUHZV securing PRWRU SXOO RXW WKH SLQ RI OHDGLQJ ZLUH IRU PRWRU RHPRYH WKH VFUHZV securing PRWRU VXSSRUW DQG FKDVVLV WR UHPRYH WKH PRWRU DQG PRWRU V...

Page 63: ...XFWDQFH and isolation sheet to remove the PFC HOHFWULFDO LQGXFWDQFH HOG FXW WKH ZHOGLQJ SRLQW MRLQLQJ WKH IRXU ZD YDOYH ZLWK EORZWRUFK WR UHPRYH WKH IRXU ZD YDOYH VXE DVV 1RWH POHDVH PDNH VXUH WKHUH V...

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Page 65: ...YDOYH VXSSRUW assem bly and chassis sub assembly to remove the YDOYH VXSSRUW DVVembl HOG FXW WKH ZHOGLQJ SRLQW MRLQLQJ E9 VXE DVVembl and refrigerant collection pipe to remove WKH E9 assembly Note Ful...

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Page 72: ...l on the right side Disassembly and Assembly of Outer Casing Remove the securing screws on the cover plate by using a screwdriver Remove the cover plate Remove the securing screws on the front panel b...

Page 73: ...6 Disassemble the fan blades Remove the securing screws on the grille by using a screwdriver Remove the grille Remove the securing screws on the outer casing byusing a screwdriver Remove the outer ca...

Page 74: ...with compressor Disconnect the pipeline connected with compressor Disassembly and Assembly of Compressor Remark Make sure that there is no refrigerant in pipe system and the power supply is cut off b...

Page 75: ...e the compressor on the bottom plate Tighten the nuts using a socket wrench Remove the bolts on the compressor using a socket wrench Take down the faulty compressor from the bottom plate Steps Procedu...

Page 76: ...the 4 way valve and reconnect it with the pipeline 4 Install the 4 way valve coil Disconnect the 4 way valve and the connected pipe with a welding gun Take down the faulty 4 way valve Place the new 4...

Page 77: ...lectronic expansion valve coil Disassembly and Assembly of Electronic Expansion Valve Disconnect the electronic expansion valve and the connected pipe using a welding gun Place the new electronic expa...

Page 78: ...ly and Assembly of Vapor Liquid Separator Disconnect the liquid separator and the connected pipeline Remove the bolt securing the liquid separator using a socket wrench that fits the bolts Remove the...

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Page 82: ...74...

Page 83: ...Product improvement specifications and appearance in this manual are subject to change without prior notice Johnson Controls Inc USA LIT 12012184...

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