Mars COMFORT-AIRE Century A-VMH09SU-1 Service Manual Download

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Service Manual

VMH 9/12/18/24 SU Series

VMH 30/36 SD Series

Inverter Single Zone

Ductless Mini-Split

www.marsdelivers.com

Summary of Contents for COMFORT-AIRE Century A-VMH09SU-1

Page 1: ...Service Manual VMH 9 12 18 24 SU Series VMH 30 36 SD Series Inverter Single Zone Ductless Mini Split www marsdelivers com...

Page 2: ...nd the Elevation 9 6 4 Initial Installation 10 6 5 Adding the Refrigerant After Running the System for Many Years 10 6 6 Re installation if the Indoor Unit Has Been Repaired 11 6 7 Re installation Aft...

Page 3: ...and the fins on the condenser and evaporator For installation always contact the dealer or an authorized service center Do not install this product on a defective installation stand Be sure the insta...

Page 4: ...d away properly A bad connection may cause water leakage Keep level even when installing this product It can avoid vibration or water leakage Do not install the product where the noise or hot air from...

Page 5: ...s risk of fire or explosion Do not recharge or disassemble the batteries Do not dispose of batteries in a fire They may explode If the liquid from the batteries gets onto your skin or clothes wash it...

Page 6: ...Service Manual VMH 9 12 18 24 SU VMH30 36S D Series 4 2 2 Part names of Indoor Outdoor units...

Page 7: ...Series 5 6 3 Dimension 3 1 Indoor Unit W D Model W D H B VMH09SU 1 835mm 32 9in 198mm 7 8in 280mm 11 0in B VMH12SU 1 B VMH18SU 1 990mm 39 0in 218mm 8 6in 315mm 12 4in B VMH24SU 1 1186mm 46 7in 258mm...

Page 8: ...Service Manual VMH 9 12 18 24 SU VMH30 36S D Series 6 7 For B VMH09SU 1 B VMH12SU 1 For B VMH18SU 1 For B VMH24SU 1 For B VMH30SD 1 B VMH36SD 1...

Page 9: ...mm B in mm A VMH09SU 1 31 5 800 13 11 333 21 81 554 34 25 870 20 24 514 13 39 340 A VMH12SU 1 A VMH18SU 1 33 27 845 14 29 363 27 64 702 35 98 914 21 26 540 13 78 350 A VMH24SU 1 37 24 946 16 14 410 3...

Page 10: ...EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER Compressor 2 WAY VALVE 3 WAY VALVE 4 WAY VALVE COOLING HEATING T2 Evaporator temp sensor T1 Room temp sensor T3 Condenser temp sensor T5 Discharge temp sen...

Page 11: ...e or switch are determined by the maximum current indicated on the nameplate which is located on the side panel of the unit Please refer to the nameplate before selecting the cable fuse and switch Mod...

Page 12: ...e low pressure manifold valve 5 Evacuate for 30 minutes and check that micron gauge reads 500 microns If not it should be pumped 20 minutes more If the pressure can t achieve 500 microns after pumping...

Page 13: ...3 way valve s gas service port 3 Connect the high pressure charge hose to the vacuum pump 4 Fully open the low pressure handle of the manifold 5 Operate the vacuum pump to evacuate 6 Evacuate for 30...

Page 14: ...from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the...

Page 15: ...18SU VMH24SU 30 C 50 C 22 F 122 F 30 C 30 C 22 F 86 F 0 C 50 C 32 F 122 F T 32 CAUTION 1 If the air conditioner is used beyond the above conditions certain safety protection features may come into ope...

Page 16: ...N indication lamp optional function This lamp illuminates when Clean Air feature is activated DEFROST indication lamp Lights up when the air conditioner starts defrosting automatically or when the war...

Page 17: ...l open 10 seconds later If the unit runs in heating mode the indoor fan will also be controlled by anti cold wind function Fan will turn on low speed at 87 F coil temperature Fan will switch to high s...

Page 18: ...programmed parameter of temperature compensation a b c d 1 Outdoor fan and compressor stop 2 Temperature setting function is disabled and no setting temperature is displayed 3 Indoor fan can be set t...

Page 19: ...fan motor will run at the minimum speed or setting speed The anti cold air function is valid The indoor fan is controlled as below Setting fan speed Actual fan speed H H H H H G M M M M M M Z L L L L...

Page 20: ...machine 8 4 6 2 In forced operation mode all general protections and remote control are available 8 4 6 3 Operation rules Forced cooling mode The compressor runs at F2 frequency and indoor fan runs a...

Page 21: ...quiry status it will display the code name in 2 seconds the details are as follows Enquiry information Displaying code Meaning T1 T1 T1 temp T2 T2 T2 temp T3 T3 T3 temp T4 T4 T4 temp T2B Tb T2B temp T...

Page 22: ...1 159 Indoor fan speed Outdoor fan speed 0 OFF 1 2 3 4 Low speed Medium speed High speed Turbo For some big capacity motors 14 FF Actual fan speed Display value turns to decimal value and then multipl...

Page 23: ...ut off Do not forget to discharge the electricity in capacitor Electrolytic Capacitors HIGH VOLTAGE CAUTION For other models please connect discharge resistance approx 100 40W or soldering iron plug b...

Page 24: ...t EEPROM parameter error 6 times O F5 Outdoor fan speed has been out of control 1 times P0 IPM malfunction or IGBT over strong current protection 2 times P1 Over voltage or over low voltage protection...

Page 25: ...2 R97 R161 R1 62 R1 63 R164 R165 R1 76 R177 R419 X1 C58 E405 IC404 R45 Q1 C 15 C22 R21 R22 R28 R29 R33 E22 R3 R4 R121 C5 E6 R10 C28 C4 CN38 IC10 C79 C80 D7 C6 R 148 R 63 C506 R5 07 R508 E11 R106 C73 I...

Page 26: ...loop communication E digital display Fuse T30A 250V connect to high and low pressure sensor connect to trmp sensor Fuse 5A 250V connect to earth CN23 reserve digital display button test report connect...

Page 27: ...V U IPM2 IPM1 IC14 24C08 CN54 L IN2 N IN2 OUTFAN DC IC1 CN53 power supply connect to the terminal 208 230V AC CN54 CN51 CN52 PFC inductance terminal CN58 EATTH 210 300VDC Running CAPACITOR Voltage 29...

Page 28: ...k from EEPROM chip Possible causes Installation error PCB faulty Troubleshooting Yes Replace the indoor outdoor main PCB Power off then restart the unit 2 minutes later EEPROM a read only memory whose...

Page 29: ...door unit does not receive the feedback from outdoor unit during 110 seconds and this condition happens four times continuously Possible causes Wiring error Indoor or outdoor PCB faulty Trouble shooti...

Page 30: ...When AC is running normal the voltage will move alternately between 25V to 25V If the outdoor unit has malfunction the voltage will move alternately with positive value If the indoor unit has a malfun...

Page 31: ...nosis and solution E2 Error Code E2 Malfunction conditions When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal Possible causes C...

Page 32: ...indoor fan speed remains too low 300RPM for certain time the unit will stop and the LED will display the failure Possible causes Wiring error Fan assembly faulty Fan motor faulty PCB faulty Troublesho...

Page 33: ...he resistances are not equal to each other the fan motor has problems and needs to be replaced otherwise the PCB has problems and needs to be replaced otherwise the PCB has problems and needs to be re...

Page 34: ...3 Malfunction conditions If the sampling voltage is lower than 0 06V or higher than 4 94V the LED will display the failure Possible causes Wiring error Sensor faulty Check the connection between tempe...

Page 35: ...nds and this situation happens 3 times the display area will show EC and AC will turn off Possible causes T2 sensor faulty Indoor PCB faulty System problems such as leakage or blocking Troubleshooting...

Page 36: ...ms System blockage PCB faulty Wiring error Compressor malfunction Troubleshooting Check the power supply Is it normal Stop the unit Check the power supply Is there any blockage Replace the compressor...

Page 37: ...18K Check the wiring between main PCB and compressor Are the wires and connectors broken Check whether the outdoor fan runs properly or the outdoor unit ventilation is good Check whether the compresso...

Page 38: ...Service Manual VMH 9 12 18 24 SU VMH30 36S D Series 36 39 For example P U P V Note The photos below are only for reference it may be not be the same as your equipment...

Page 39: ...Service Manual VMH 9 12 18 24 SU VMH30 36S D Series 37 P W N U...

Page 40: ...Service Manual VMH 9 12 18 24 SU VMH30 36S D Series 38 41 N V N W...

Page 41: ...ier Check the wiring of reactor or inductor Reconnect the wiring Replace reactor or inductor Check whether reactor or inductor is normal Check whether the power voltage is normal Measure whether outdo...

Page 42: ...cuit Possible causes Power supply problems System leakage or blockage PCB faulty Troubleshooting P N Check the power supply Is it OK Stop the unit Check the connections and wires Are they OK Correct t...

Page 43: ...s and solution P2 Error Code P2 Malfunction conditions If the voltage is not 5V the LED will display the failure Possible causes PCB faulty Troubleshooting Check if the fastening screws on the PCB and...

Page 44: ...onnected well Correct the connection or replace the wires and connectors Check the reactor or inductor Is it normal Replace the reactor or inductor Check the IPM Is it installed correctly Correct the...

Page 45: ...the large capacity electrolytic capacitors discharge completely and dismount the IPM Use a digital tester to measure the resistance between P and UVWN UVW and N Digital tester Normal resistance value...

Page 46: ...e bridge rectifier Check whether bridge rectifier is normal Reconnect Reconnect Check that the wiring of bridge rectifier is correct and tight Check whether the connecting wire between main board and...

Page 47: ...e protector and main control board connected tightly and correctly Correct wiring Replace low pressure protector Is the low pressure protector broken Disconnect the plug Measure the resistance of the...

Page 48: ...ect the temperature sensor from PCB measure the resistance value with a tester Temperature sensors Room temp T1 sensor Indoor coil temp T2 sensor Outdoor coil temp T3 sensor Outdoor ambient temp T4 se...

Page 49: ...878 37 99 5 87359 77 171 1 29078 117 243 0 38991 2 28 39 8239 38 100 5 62961 78 172 1 25423 118 244 0 37956 1 30 37 1988 39 102 5 39689 79 174 1 2133 119 246 0 36954 0 32 35 2024 40 104 5 17519 80 176...

Page 50: ...35 78 75 167 8 084 115 239 2 422 4 25 222 8 36 97 34 32 76 169 7 82 116 241 2 357 3 27 211 4 37 99 32 94 77 171 7 566 117 243 2 294 2 28 200 7 38 100 31 62 78 172 7 321 118 244 2 233 1 30 190 5 39 10...

Page 51: ...89 6 63 145 4 94 201 2 125 257 4 39 2 33 91 4 64 147 2 95 203 126 258 8 4 5 40 1 34 93 2 65 149 96 204 8 127 260 6 5 41 35 95 66 150 8 97 206 6 128 262 4 6 42 8 36 96 8 67 152 6 98 208 4 129 264 2 7 4...

Page 52: ...s 50 53 Appendix 4 Normal voltage of P and N 208 240V 1 phase 3 phase 380 420V 3 phase In standby around 310VDC around 530VDC In operation With passive PFC module With partial active PFC module With f...

Page 53: ...e resistance value of each winding by using the tester Position Resistance Value DA110S1 C 30FZ DA130M1C 31FZ DA250S2C 3 0MT ATM115D43 UFZ2 ATM150D23 UFZ TNB306FPG MC L Blue Red 0 8 20 C 68 F 1 77 20...

Page 54: ...igital tester Normal resistance value Red Black Several M Red Black Several M P N U N U V V W W Red 4 Indoor AC Fan Motor Measure the resistance value of each winding by using the tester Position Resi...

Page 55: ...6 10 1 BAR 75 63 8 6 8 3 8 7 9 1 10 7 BAR 80 67 9 3 8 9 9 1 9 6 11 2 F C ODT IDT 75 23 89 85 29 44 95 35 105 40 56 115 46 11 PSI 70 59 119 113 117 125 147 PSI 75 63 124 120 126 132 155 PSI 80 67 135 1...

Page 56: ...0 26 6 25 4 23 3 BAR 75 33 8 31 5 27 8 26 3 24 9 F C ODT IDT 57 53 13 89 11 67 47 43 8 33 6 11 37 33 2 78 0 56 27 23 2 78 5 17 13 8 33 10 56 PSI 55 439 413 367 330 302 PSI 65 471 435 386 368 339 PSI...

Page 57: ...el How to remove the front panel 1 Pull below side of the panel and release the clips Then remove the front panel 2 Remove the filter and horizontal louver 3 Remove the four fixing screws 4 Remove the...

Page 58: ...rews 2 Pull out the clip toward the left side and open the cover 3 Remove the mounting screw and open the electrical box cover 4 Pull out the connectors of the swing motor and fan motor 5 Remove the m...

Page 59: ...ng procedure 1 and procedure 2 remove the pipe holder at the rear side of the unit 2 Remove the two screws on the evaporator at the base bearing side 3 Remove two screws on the evaporator at the fixed...

Page 60: ...nd motor How to remove the fan and motor Three screws One screw 1 After removing the evaporator assembly following procedure 1 procedure 2 and procedure 3 remove the three screws attaching the cover 2...

Page 61: ...e air conditioner and turn OFF power at the breaker 2 Remove the big handle first and then remove the top panel 3 screws 3 Remove the screws of front panel 6 screws 4 Remove the screws of the right si...

Page 62: ...remove the fan assembly 1 2 Compressor T3 T4 T5 Sensor Motor Electronic expansion valve 4 way valve 1 After removing the panel plate following Procedure 1 remove the hex nut fixing the fan and then r...

Page 63: ...e electronic control board 4 Remove the four mounting screws of the fan motor Then remove the fan motor 3 Electrical parts How to remove the electrical parts 1 After finishing item 1 and item 2 remove...

Page 64: ...l out connectors of the condenser coil temp sensor T3 outdoor ambient temp sensor T4 and discharge temp sensor TP 4 Disconnect the electronic expansion valve wire 5 Remove the grounding screw 6 Remove...

Page 65: ...parts of four way valve and pipe 5 Then the four way valve assembly can be removed The picture of four way valve may be different from your valve 3 4 5 Compressor How to remove the compressor 1 After...

Page 66: ...plate How to remove the panel plate 1 Stop operation of the air conditioner and turn OFF power at the breaker 2 Remove the top panel 3 screws 3 Remove the screws of front panel 9 screws 4 Remove the s...

Page 67: ...plate following Procedure 1 remove the hex nut attaching the fan and then remove the fan 2 After removing the top cover disconnect the hooks and open the electronic control box cover 1 2 T3 T4 T5 Sen...

Page 68: ...tor for fan motor from the electronic control board 4 Remove the four mounting screws of the fan motor Remove the fan motor 3 Electrical parts How to remove the electrical parts 1 After finishing work...

Page 69: ...s 67 70 2 Pull out the two blue wires connected with the four way valve 3 Pull out connectors of the condenser coil temp sensor T3 outdoor ambient temp sensor T4 and discharge temp sensor TP 4 Disconn...

Page 70: ...Service Manual VMH 9 12 18 24 SU VMH30 36S D Series 68 71 5 Remove the electric heaters 6 Remove the grounding screw 7 Remove the Wires 1 2 3 or L1 L2 S Then remove the electronic control box 5 7...

Page 71: ...arts of four way valve and pipe 5 Then the four way valve assembly can be removed The picture of four way valve may be different from your equipment 3 5 Compressor How to remove the compressor 1 After...

Page 72: ...te 1 Stop operation of the air conditioner and turn OFF the power breaker 2 Remove the big handle first then remove the top cover 7 screws 3 Remove the screws from front panel 11 screws 4 Remove the s...

Page 73: ...How to remove the fan assembly 1 After removing the panel plate following procedure 1 2 Remove the nut attaching the fan and remove the fan 3 Disconnect the hooks and remove the screws then open the e...

Page 74: ...72 75 4 Disconnect the connector for fan motor from the electronic control board 5 Remove the four mounting screws of the fan motor then remove the motor 5 4 T3 T4 T5 Sensor Pressure Switch Compressor...

Page 75: ...ve the electrical parts 1 After finishing item 1 and item 2 remove the connector for the compressor 2 Pull out the two blue wires connected with the four way valve 3 Pull out connectors of the condens...

Page 76: ...S D Series 74 77 4 Disconnect the pressure switch connector 5 Disconnect the electronic expansion valve wire from the control board 6 Remove the ground wires 7 Remove the wires 1 2 3 or L1 L2 S Then r...

Page 77: ...parts of four way valve and pipe 5 Then the four way valve assembly can be removed The picture of four way valve may be different from the one on your side 5 Compressor How to remove the compressor 1...

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