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Willis WCM18MH18S, Service Manual

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Willis WCM18MH18S Service Manual Download Page 106

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Procedure

Steps

1.Remove cable cross plate and valve cover

cable cross plate

valve cover

3.Remove reactor sub-assy

2.Remove top cover

Remove connection screw fixing cable cross 
plate and valve cover then remove them.

Remove connection screws connecting the top 
cover plate with the front panel and the right 
side plate,and then remove the top cover.

Remove screws fixing reactor sub-assy, and
then pull the reactor sub-assy upwards to
remove it. Remove screws on reactor sub-
assy cover, and then remove the reactor.

reactor

top cover

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Summary of Contents for WCM18MH18S

Page 1: ...Service Manual...

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Page 5: ...QWUROOHU 2XWGRRU 8QLW WMI09MH16S with electric heating band WCM18MH18S with electric heating band WCM24MH18S with electric heating band WMI12MH16S with electric heating band 1 ON OFF MODE FAN CLOCK TI...

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Page 11: ...or air flow Turbo Pipe length 25 ft Conditions Indoor DB 70 F WB 60 F Outdoor DB 47 F WB 43 F Indoor air flow Turbo Pipe length 25 ft 8QLW RROLQJ HDWLQJ 0 10 20 30 40 50 60 70 80 90 100 120 0 10 20 30...

Page 12: ...6 100 4 102 2 104 105 8 107 6 109 4 40 60 80 100 120 19 4 23 32 41 50 47 Conditions Indoor DB 70 F Indoor air flow Turbo Pipe length 25ft 8QLW RROLQJ HDWLQJ Capacity ratio Capacity ratio Outdoor temp...

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Page 14: ...w Middl e High Super Hig h Noise dB A 12K 09K 12K 09K Outdoor side noise 30 40 50 60 0 20 40 60 80 100 Compressor frequency Hz 50 55 40 45 35 Indoor side noise when blowing Indoor fan motor rotating s...

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Page 18: ...unit Outdoor unit COOLING HEATING Accumlator 4 Way valve COOLING Discharge Suction Discharge Suction Heat exchanger evaporator Heat exchanger evaporator Heat exchanger condenser Heat exchanger conden...

Page 19: ...Q VSHHG DQG WKH VZLQJ DQJOH RI KRUL RQWDO ORYHU IRU WKLV PRGHO 8QLW 0 TEMP SENSOR TEMP SENSOR AC L BK G ROOM TUBE M2 SWING UD ROOM RT2 AP2 BN PG YEGN GN 0 M1 BU FAN OUTDOOR UNIT 2 3 XT N 1 TUBE RT1 SW...

Page 20: ...R SWING RT1 TUBE N 1 XT 3 2 OUTDOOR UNIT FAN BU M1 0 YEGN GN PG BN AP2 RT2 ROOM SWING UD M2 TUBE ROOM G BK AC L TEMP SENSOR TEMP SENSOR 0 L L L ELECTRICBOX EVAPORATOR ROOM TUBE TEMP SENSOR TEMP SENSOR...

Page 21: ...AC L1 4V AC L2 LX 2 N2 N3 L COMU W9 BU W11 WH W12 EKV CN1 TEM SENSOR OUTROOM EXHAUST TEM SENSOR TEM SENSOR TUBE W2 BU W1 BN W3 BK G I N D O O R U N I T W14 YEGN POWER L2 L1 N 1 3 2 L2 L2 L2 L1 L1 G G...

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Page 23: ...COMP SAT WH WH OVC COMP OFAN G RD M1 4V 0 RT3 RT2 0 RT1 0 COM INNER G G W V U RD BU YE COMP U COMP V COMP W N AC L YEGN T SENSOR BU BN BK XT1 3 2 N 1 G G L1 L2 BN BU G POWER INDOOR UNIT G L1 L2 VALVE...

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Page 31: ...FF Button X FAN Button TEMP Button LIGHT Button SLEEP Button CLOCK Button TURBO Button Button 2 6 8 3 9 10 7 5 12 11 4 1 Operation mode Temp display type 21 2 XWWRQ 3UHVV WKLV EXWWRQ FDQ WXUQ RQ RU WX...

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Page 34: ...U LV IX RU WKHUH V QR GLVSOD SOHDVH UHSODFH EDWWHULHV Signal sender Battery Cover of battery box Remove Reinstall IWHU SXWWLQJ WKURXJK WKH SRZHU SUHVV 21 2 EXWWRQ RQ UHPRWH FRQWUROOHU WR WXUQ RQ WKH D...

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Page 40: ...n 5 Auto mode 1 When Tamb 78 8 F select the cooling mode at this time the setting temp is 77 F 2 Cooling and heating units Tamb 71 6 F will run at heating mode at this time the setting temp is 68 73 F...

Page 41: ...e auto button is pushed a buzzer will give out prompt tone 3 Auto button When the button is pushed the unit will operate in auto mode and the indoor fan will run in auto state When the indoor fan is r...

Page 42: ...Power the wind speed on the remote controller is displayed as super high air flow and the inner fans are also turned to super high air flow 11 Health Function When the inner fans are running the remot...

Page 43: ...perature Tcooling indoor ambient temperature compensation 35 6 F the cooling operation will be still running 3 During operations of cooling if 32 F Tsetup Tindoor ambient temperature Tcooling indoor a...

Page 44: ...de getting power 1 4 way valve power control under heating mode a Starts the machine under heating mode the 4 way valve will get power immediately 2 4 way valve power turn off control under heating mo...

Page 45: ...le times immediately if the trouble can not be resumed transferring mode will not clear it Overload protection function at the mode of heating Starting estimation After the compressor stopped working...

Page 46: ...age sag trouble reboot automatically after 30 minutes 7 Communication fault When you have not received any correct signal from the inner machine in three minutes the machine will stop for communicatio...

Page 47: ...t doesn t shows and if they are all failing for the successive start 3 times it shall be reported as Startingup Failure and then restart up it after 3 min When it still not be able to operate through...

Page 48: ...t should detect the exhaust sensor failure immediately in the testing mode 4 Module Temperature Sensor a Short Circuit Detection the compressor should be detected immediately when the module temperatu...

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Page 51: ...outlet side Space to the floor Above Above 6in Above 6in Above 12in Above 20in Above 20in Above 12in Above 79in Above Above Space to the obstruction Air outlet side Space to the wall Air inlet side Th...

Page 52: ...r unit Make the bound pipes pass through the wall hole and then connect outdoor unit Neaten the pipes Vacuum pumping and leakage detection Check after installation and test operation Finish installati...

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Page 57: ...H RSHQ FRPSOHWHO W PD FDXVH LQVXI FLHQW FRROLQJ KHDWLQJ FDSDFLW The water outlet can t be placed in water 8VH 9DFXXP 3XPS 5HPRYH WKH YDOYH FDSV RQ WKH OLTXLG YDOYH DQG JDV YDOYH DQG WKH QXW RI UHIULJH...

Page 58: ...e of the trans former if it is incorrect change the transformer No power Check power supply circuit Fuse of controller burnt out The air condition er does not react after it is powered the buzzer does...

Page 59: ...heat insulation for the thick and thin pipes is good Heat insulation must also be provided for the joint andthe exposed part of the copper pipe Block of outdoor heat ex changer Clean the dust accumula...

Page 60: ...too high Manostat is recommended Wrong wire connection Connect the circuit diagram correctly The built in heat protector of the motor breaks frequently because the motor is abnormal Replace the fan mo...

Page 61: ...r Drainage pipe blocked or broken Change drainage pipe Re wrap and make it tight Wrap of refrigerant pipe joint is not close enough Water leakage Change controller Wire loose or wrong connection In co...

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Page 75: ...the voltage testing circuit on control panel AP1 Replace the control panel AP1 Measure the AC voltage between terminalL andN on wiring board XT power supply Voltage within 210VAC 250VAC Shut down the...

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Page 77: ...tage between the two ends of capacitor C2 until the voltage is lower than 20V Replace the capacitor C2 Then energize and start the unit Replace the control panel AP1 Take corrective actions according...

Page 78: ...erature protection Is outdoor ambient temperature higher than 53 20 minutes after the complete unit is powered off Is heat dissipation of the indoor unit and outdoor unit abnormal Normal protection pl...

Page 79: ...FRPSUHVVRU VWRSSLQJ HQRXJK DXOW GLDJQRVLV SURFHVV Y N Y N N Y Y N Power on the unit Is stop time of the compressor longer than 3 minutes Restart it up after 3 minutes Does startup fail Are the wires f...

Page 80: ...for the compressor connected correctly Is connection sequence right Is the connection made in clockwise direction Connect the wires correctly Replace the control panel AP1 If the fault is eliminated...

Page 81: ...0 minutes after the complete unit is powered off Is the terminal FA for the electronic expansion valve connected correctly Connect the wires correctly Resistances between the first four pins close to...

Page 82: ...e or short circuit Replace it as per the wiring diagram and reconnect the wires If the fault is eliminated Remove the PFC capacitor and measure resistance between the two terminals Is the resistance a...

Page 83: ...perate normally before the failure occurs The AP1 voltage detection circuit is at fault Check wiring inside of the indoor and outdoor units Are wires broken Check the communication circuit of the outd...

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Page 85: ...e power supply to restore the range 210VAC 250VAC N power on and restart the unit If the fault is eliminated Shut down the power and wait 20n muties or use DC voltmeter to measure the voltage on the t...

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Page 87: ...he control panel AP1 N N Y Y Y Please confirm 1 If the indoor and outdoor heat exchangers are dirty If they are obstructed by other objects which affect the heat exchange of indoor and outdoor unit 2...

Page 88: ...and outdoor fan work well De energize the unit and wait for 20min Replace the control board replace the outdoor control board in cooling mode replace the indoor control board in heating mode If the ra...

Page 89: ...ssor wire COMP UVW is well connected and connection sequence is correct Replace control board AP1 If the stop time of compressor is more than 3min N If the stop time is not enough and the high and low...

Page 90: ...outdoor fan works normally If the stop time of compressor is more than 3min End Synchronism after energize the unit and start it Connect wire well Synchronism occurred during operation Replace control...

Page 91: ...heck if the expansion valve is blocked If the wiring terminal FA of electron expansion is well connected Remove malfunction Remove malfunction Check if the coil of electron expansion is installed on t...

Page 92: ...it of outdoor unit Problem of communication circuit Check if the controller connection wire inside indoor and outdoor electric box is loose Connection correct Connect wire of indoor and outdoor unit a...

Page 93: ...diagram with voltage meter Number jumping Number jumping Number jumping Number jumping Outdoor unit malfunction Test voltage value of Test 13 position in diagram with voltage meter Test voltage value...

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Page 103: ...make it separate from the groove Remove the panel Remove axial sleeve of horizontal louver Loosen the clasp of the filter Push the filter inward and then draw it upward to remove it Bend the louver o...

Page 104: ...ssy Remove the screws at the joint of the earthing wire and evaporator Loosen the clasp at the joint of the electric box cover and the electric box Remove the 2 screws of the display Remove the electr...

Page 105: ...and then remove the motor Remove the screw of the motor clamp and then remove the clamp Remove the screws at the joint of the cross flow blade and the motor Take down the motor Procedure Steps motor...

Page 106: ...r 3 Remove reactor sub assy 2 Remove top cover Remove connection screw fixing cable cross plate and valve cover then remove them Remove connection screws connecting the top cover plate with the front...

Page 107: ...Steps Remove connection screws between the front grille and the front panel Then remove the front grille Remove connection screws connecting the front panel with the chassis and the motor support and...

Page 108: ...move the nut fixing the blade and then remove the axial flow blade Remove the 4 tapping screws fixing the motor Pull out the lead out wire and remove themotor Remove the 2 tapping screws fixingthe mot...

Page 109: ...the clapboard sub assy to remove Unscrew the fastening nut of the 4 way valve assy coil and remove the coil Wrap the 4 way valve assy with wet cotton and unsolder the 4 weld spots connecting the 4 wa...

Page 110: ...over pull the top cover upward to remove it Twist off the screws used for fixing the rear grill pull the rear grill upward to remove it Procedure Steps top cover rear grill front panel front grill Rem...

Page 111: ...the screws fixing the electric box sub assy loosen the wire bundle pull out the wiring terminals and then pull the electric box upwards to remove it Remove the nuts fixing the blade and then remove th...

Page 112: ...en remove the reactor Remove screws fixing isolation sheet and then remove the isolation sheet reactor isolation sheet Procedure Steps 4 way valve assy Discharge the refrigerant completely unsolder th...

Page 113: ...ing wrap the gas valve with awet cloth completely to avoid damage to the valve caused by high temperature Remove the screws fixing the liquid valve and unsolder the welding joint connecting the liquid...

Page 114: ...ing the handle pull the handle upward to remove it Loosen the screws fixing the valve cover and then remove the valve cover Twist off the screws used for fi xing the top cover pull the top cover upwar...

Page 115: ...el pull it upward loosen the clasp on the right side rotate it to the left and then remove the front panel 2 Remove the screws connecting the right side plate with the chassis the valve support and th...

Page 116: ...nd then remove the axial flow fan Remove the screws fixing the electric box sub assy loosen the wire bundle pull out the wiring terminals and then pull the electric box upwards to remove it 1 Twist of...

Page 117: ...fixing the valve sub assy Unsolder the soldering joint between gas valve and air return pipe and then remove the gas valve note when unsoldering the soldering joint wrap the gas valve with wet cloth...

Page 118: ...pressor and the condenser assy and then remove the 4 way valve Twist off the three foot nuts on compressor and then remove the compressor Remove the 4 tapping screws fixing the motor disconnect the le...

Page 119: ...fixing the valve cover and then remove it Procedure Steps 2 Remove top cover Remove connection screws connecting the top cover plate with the front panel and the right side plate and then remove the t...

Page 120: ...edure Steps Remove screws connecting front side plate outer case and chassis and then remove the front side plate Remove screws fixing front panel chassis and motor support and then remove the front p...

Page 121: ...emove nut on blade with wrench and then remove the axial flow blade Remove screws fixing electric box cut off the tielien with scissors pull out the wiring terminal and then lift up the electric box t...

Page 122: ...fixing the motor support pull it upwards and then remove the motor support Twist off the screws connecting isolation sheet and end plate of condenser and chassis and then remove the isolation sheet U...

Page 123: ...ove the gas valve note when unsoldering the soldering joint wrap the gas valve with wet cloth completely to avoid the damage to valve and release all refrigerant completely at first Unsolder the solde...

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Page 129: ...Willis Air Conditioning Add 2105 chemin de la cote de liesse Montr al QC H4N 2M5 Canada Tel 514 735 7147...

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