Mars Comfort-Aire Century A-VMH18SV-1 Service Manual Download

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Service Manual -

B-VMHxxAV-1

VMH-SV Series

Air-Handler Air Conditioners

Model

B-VMH18, 24 AV-1 Series

www.marsdelivers.com

Service Manual

Summary of Contents for Comfort-Aire Century A-VMH18SV-1

Page 1: ...Service Manual B VMHxxAV 1 VMH SV Series Air Handler Air Conditioners Model B VMH18 24 AV 1 Series www marsdelivers com Service Manual ...

Page 2: ...nal Appearance 1 Model Reference 2 External Appearance Indoor Unit 1 Indoor Unit Air Handler Type Outdoor Unit 1 Dimensional Drawings 2 Service Space 3 Capacity Correction Factor for Height Difference 4 Noise Criterion Curves 5 Refrigerant Cycle Diagrams 6 Electrical Wiring Diagrams Installation Maintenance Product Features ...

Page 3: ... and Troubleshooting Without Error Code 6 Quick Maintenance by Error Code 7 Troubleshooting by Error Code 8 Check Procedures Indoor Unit Disassembly 1 Indoor Unit Air Handler Type Outdoor Unit Disassembly Appendix i Temperature Sensor Resistance Value Table for T1 T2 T3 and T4 C K ii Temperature Sensor Resistance Value Table for TP for some units C K iii Pressure On Service Port ...

Page 4: ...Service Manual B VMHxxAV 1 Contents 1 Precautions 2 2 Information servicing For flammable materials 3 Safety Precautions ...

Page 5: ...ctrician should perform electri cal work For more information contact your dealer seller or an authorized service center CAUTION While unpacking be careful of sharp edges around the unit as well as the edges of the fins on the con denser and evaporator 1 3 Operation and Maintenance WARNING Do not use defective or under rated circuit breakers Ensure the unit is properly grounded and that a dedicate...

Page 6: ...space Prior to work taking place the area around the equipment is to be surveyed to make sure that there are no flammable hazards or ignition risks NO SMOKING signs shall be displayed 2 7 Ventilated area Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot work A degree of ventilation shall continue during the period that the...

Page 7: ... in the ignition of refrigerant in the atmosphere from a leak 2 12 Cabling Check that cabling will not be subject to wear corrosion excessive pressure vibration sharp edges or any other adverse environmental effects The check shall also take into account the effects of aging or continual vibration from sources such as compressors or fans 2 13 Detection of flammable refrigerants Under no circumstan...

Page 8: ...ed prior to re use of reclaimed refrigerant It is essential that electrical power is available before the task is commenced Become familiar with the equipment and its operation Isolate system electrically Before attempting the procedure ensure that mechanical handling equipment is available if required for handling refrigerant cylinders all personal protective equipment is available and being used...

Page 9: ...that any associated electrical components are sealed to prevent ignition in the event of a refrigerant release Consult manufacturer if in doubt The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder and the relevant Waste Transfer Note arranged Do not mix refrigerants in recovery units and especially not in cylinders If compressors or compressor oi...

Page 10: ...Service Manual B VMHxxAV 1 Contents 1 Model Reference 2 2 External Appearance 3 Model Reference ...

Page 11: ... Refer to the following table to determine the specific indoor and outdoor unit model number of your purchased equipment Indoor Unit Model Outdoor Unit Model Capacity Btu h Power Supply AHU B VMH18AV 1 18k 1Ph 208 230V 60Hz A VMH18SV 1 B VMH24AV 1 24k A VMH24SV 1 ...

Page 12: ...Service Manual B VMHxxAV 1 Model Reference 3 2 External Appearance 2 1 Indoor Unit Air handler 2 2 Outdoor Unit Single Fan Outdoor Unit ...

Page 13: ... 2 2 Dimensional Drawings 3 3 Part names 4 4 Service Place 4 5 Accessories 5 6 Fan Performance 6 7 Capacity Tables 9 9 8 Noise Criterion Curves 1 15 5 9 Electrical Characteristics 1 16 6 10 Electrical Wiring Diagrams 1 17 7 Indoor Unit Air Handler ...

Page 14: ...lligently self detecting the failure cause and generate a corresponding code Installer or user can easily check the fault code displayed on the electric function board by just opening the lid It helps you proactively determine the failure cause prepare for repairing parts ahead of field maintenance work greatly improve the work efficiency 1 4 Nitrogen Charge and Leakage Check Valve The AHU indoor ...

Page 15: ...Manual B VMHxxAV 1 IDU Air Handler 3 2 Dimensional Drawings Model Unit Dimensions mm Drain hole A B C D E F L1 L2 18k 24k mm 1143 534 445 400 260 585 Main drain Overflow drain inch 45 21 17 1 2 15 3 4 10 1 4 23 ...

Page 16: ...Manual B VMHxxAV 1 IDU Air Handler 4 3 Part names coil compartment Access panel Removed Upflow drain pan Horizontal drain pan 4 Service Place MINIMUM CLEARANCE OF 25 4mm 1 ALL SIDES FLEXIBLE DUCT COLLAR 1 5m 59 ...

Page 17: ...uantity Manual 3 Remote controller 1 Battery 2 Transfer connector some models 1 Wired remote controller 1 Fasten belt 2 Sponge 4 Transfer connector some models 1 Flare nut 2 Packed with the outdoor unit Drain joint 1 Seal 1 Note The remote control is only used to adjust the parameters Installation of Electric Auxiliary Heat Module for some models not supplied Name Shape Quantity Owner s manual Ins...

Page 18: ...e 0 100 200 300 400 500 600 700 800 0 0 04 0 1 0 148 0 2 0 3 0 4 0 5 0 6 Air flow rate CFM External static pressure in w c 18K L M H 0 100 200 300 400 500 600 700 800 0 0 04 0 1 0 148 0 2 0 3 0 4 0 5 0 6 Air flow rate CFM External static pressure in w c 24K L M H ...

Page 19: ... 42 5 62 5 74 5 74 5 80 5 79 5 79 5 79 5 79 6 19 6 19 6 19 6 19 S T 0 76 0 87 0 97 1 00 0 60 0 70 0 80 0 90 0 52 0 62 0 72 0 81 0 35 0 44 0 53 0 62 PI 1 00 1 00 1 00 1 00 1 00 1 00 1 00 1 00 1 00 1 00 1 00 1 00 1 00 1 00 1 00 1 00 68 TC 5 24 5 24 5 30 5 36 5 56 5 56 5 56 5 62 5 73 5 73 5 73 5 73 6 13 6 13 6 13 6 13 S T 0 76 0 87 0 97 1 00 0 60 0 70 0 80 0 90 0 52 0 62 0 72 0 81 0 35 0 44 0 53 0 62...

Page 20: ... 1 88 1 88 1 88 1 88 1 90 1 90 1 90 1 90 577 5 TC 5 74 5 80 5 86 5 92 6 05 6 05 6 05 6 11 6 20 6 20 6 20 6 20 6 57 6 57 6 57 6 57 S T 0 77 0 88 1 00 1 00 0 60 0 70 0 81 0 98 0 51 0 62 0 72 0 83 0 33 0 42 0 52 0 63 PI 1 00 1 00 1 00 1 00 0 99 0 99 0 99 0 99 1 00 1 00 1 00 1 00 0 99 0 99 0 99 0 99 14 TC 5 71 5 77 5 83 5 89 6 02 6 02 6 02 6 08 6 17 6 17 6 17 6 17 6 55 6 55 6 55 6 55 S T 0 78 0 88 1 0...

Page 21: ...5 14 5 20 5 23 5 23 5 23 5 28 5 69 5 69 5 69 5 69 S T 0 88 1 00 1 00 1 00 0 66 0 80 0 94 1 00 0 56 0 70 0 83 0 97 0 33 0 45 0 58 0 71 PI 2 33 2 33 2 33 2 33 2 34 2 34 2 34 2 34 2 34 2 34 2 34 2 34 2 36 2 36 2 36 2 36 695 5 TC 7 19 7 25 7 31 7 37 7 55 7 55 7 55 7 64 7 75 7 75 7 75 7 75 8 22 8 22 8 22 8 22 S T 0 76 0 87 0 98 1 00 0 59 0 70 0 80 0 90 0 51 0 62 0 71 0 82 0 33 0 42 0 52 0 62 PI 1 24 1 ...

Page 22: ...1 34 1 34 1 34 1 34 1 33 1 33 1 33 1 33 68 TC 7 00 7 06 7 11 7 17 7 43 7 43 7 43 7 52 7 66 7 66 7 66 7 66 8 20 8 20 8 20 8 20 S T 0 81 0 93 1 00 1 00 0 62 0 74 0 86 0 97 0 54 0 65 0 76 0 87 0 34 0 44 0 55 0 65 PI 1 38 1 38 1 38 1 38 1 38 1 38 1 38 1 38 1 38 1 38 1 38 1 38 1 37 1 37 1 37 1 37 77 TC 6 68 6 74 6 80 6 86 7 09 7 09 7 09 7 14 7 31 7 31 7 31 7 40 7 86 7 86 7 86 7 86 S T 0 82 0 95 1 00 1 ...

Page 23: ... 2 40 2 33 2 33 17 0 5 51 5 45 5 42 5 39 2 46 2 55 2 47 2 47 22 0 5 42 5 37 5 34 5 31 2 37 2 37 2 37 2 37 27 0 5 31 5 28 5 25 5 22 2 19 2 19 2 19 2 18 32 0 5 16 5 10 5 08 5 05 2 03 2 02 2 01 2 01 37 0 5 19 5 13 5 10 5 05 1 88 1 86 1 85 1 84 42 0 5 37 5 31 5 28 5 22 1 72 1 69 1 68 1 67 44 6 5 57 5 51 5 48 5 45 1 64 1 52 1 60 1 58 52 0 5 63 5 54 5 51 5 45 1 40 1 36 1 34 1 32 57 0 5 63 5 54 5 51 5 48...

Page 24: ...1 57 1 58 17 0 4 31 4 28 4 25 4 22 1 61 1 67 1 66 1 68 22 0 4 43 4 40 4 37 4 34 1 60 1 63 1 65 1 66 27 0 4 54 4 48 4 45 4 43 1 57 1 61 1 62 1 64 32 0 4 60 4 54 4 51 4 48 1 55 1 58 1 60 1 62 37 0 4 80 4 75 4 72 4 69 1 54 1 58 1 59 1 61 42 0 5 18 5 12 5 10 5 07 1 54 1 57 1 58 1 60 44 6 5 57 5 51 5 39 5 37 1 54 1 57 1 58 1 60 52 0 5 83 5 74 5 71 5 66 1 52 1 55 1 56 1 58 57 0 6 03 5 95 5 92 5 86 1 50 ...

Page 25: ...2 98 2 99 17 0 7 47 7 38 7 35 7 32 3 14 3 26 3 16 3 17 22 0 7 36 7 27 7 24 7 21 3 04 3 05 3 06 3 07 27 0 7 24 7 15 7 12 7 09 2 85 2 85 2 86 2 86 32 0 7 04 6 98 6 92 6 89 2 65 2 65 2 65 2 65 37 0 7 09 7 01 6 95 6 92 2 48 2 47 2 46 2 46 42 0 7 36 7 24 7 21 7 15 2 31 2 29 2 28 2 27 44 6 7 65 7 53 7 50 7 45 2 24 2 11 2 20 2 18 52 0 7 71 7 59 7 53 7 48 1 96 1 93 1 91 1 89 57 0 7 74 7 62 7 56 7 50 1 78 ...

Page 26: ...2 29 2 31 17 0 5 55 5 49 5 46 5 43 2 37 2 45 2 43 2 45 22 0 5 70 5 64 5 62 5 59 2 33 2 37 2 39 2 40 27 0 5 88 5 79 5 76 5 73 2 26 2 30 2 31 2 33 32 0 5 96 5 88 5 85 5 79 2 19 2 22 2 24 2 26 37 0 6 25 6 17 6 14 6 08 2 14 2 17 2 19 2 20 42 0 6 77 6 69 6 63 6 60 2 10 2 12 2 14 2 15 44 6 7 33 7 24 7 07 7 04 2 08 2 08 2 12 2 13 52 0 7 67 7 56 7 50 7 47 1 99 2 01 2 02 2 03 57 0 7 96 7 85 7 79 7 73 1 93 ...

Page 27: ...lid at free field condition Data is valid at nominal operation condition Reference acoustic pressure OdB 20µPa Sound level will vary depending on a range of factors such as theconstruction acousticabsorptioncoefficient ofparticular room in which the equipment is installed The operating conditions are assumed to be standard B VMH18AV 1 B VMH24AV 1 ...

Page 28: ...ameter AWG 16 1 5mm2 16 1 5mm2 Outdoor indoor Connection Wire 2 Line quantity Line diameter AWG Thermostat Signal Wire Line quantity Line diameter AWG 18 1 0mm2 18 1 0mm2 Capacity Btu h 18k current loop 24k current loop Power Outdoor Phase 1 1 Frequency And Volt 208 230V 60Hz Max Fuse Indoor unit A 15 15 Outdoor unit A 30 30 Outdoor Unit Power Wire Line quantity 3 3 Line diameter AWG 14 2 5mm 12 4...

Page 29: ... 24k 16023000012126 Abbreviation Paraphrase Y G Yellow Green Conductor CAP Indoor Fan Capacitor FAN Indoor Fan Motor ECM Indoor ECM Motor TO CCM Comm Bus Central Controller T1 Indoor Room Temperature Sensor T2A Indoor Coil Inlet Temperature Sensor T2B Indoor Coil Outlet Temperature Sensor T2 Indoor Coil Temperature Sensor ...

Page 30: ...Service Manual B VMHxxAV 1 ...

Page 31: ...t to connect ALARM but no voltage of the terminal port the power from the ALARM system not from the unit 2 Although design voltage can support higher voltage but we strongly ask you connect the power less than 24V current less than 0 5A 3 When the unit occurs the problem the relay would be closed then ALARM works ...

Page 32: ...close open the remote switch the unit would be responded the demand within 2 seconds 5 When the remote switch on you can use remote controller wire controller to select the mode what you want when the remote switch off the unit would not respond the demand from remote controller wire controller when the remote switch off but the remote controller wire controller are on CP code would be shown on th...

Page 33: ... series units from 7K to 68K This ENC1 setting will tell the main program what size the unit is NOTE Usually there is glue on it because the switch position cannot be changed at random unless you want to use this PCB as a spare part to use in another unit Then you have to select the right position to match the size of the unit 53 means 5 3kW 18K 105 means 10 5kW 36K and so on 0 8 4 1 2 3 5 6 7 C 9...

Page 34: ...ng time when the set temperature of 1 C 1 8 F is not reached E square value 0 5 hour 1 5 hours SW3 2 Cooling and heating Y2 signal setting temperature adjustment value A 1 C 1 8 F 2 C 3 6 F SW3 3 Hysteresis of the second group of electric heating 2 C 3 6 F 3 C 5 4 F SW3 4 Reserve S4 1 Default ON Short circuit W1 and W2 W1 W2 separate S4 2 Default ON DH is off by default DH on SW4 1 000 is the defa...

Page 35: ...AV 1 Contents 1 Dimensional Drawings 2 2 Service Place 5 5 3 Capacity Correction Factor for Height Difference 6 6 4 Noise Criterion Curves 7 7 5 Refrigerant Cycle Diagrams 9 9 6 Electrical Wiring Diagrams 1 10 0 Outdoor Unit ...

Page 36: ...Service Manual B VMHxxAV 1 Outdoor Unit 2 1 Dimensional Drawings Please check the corresponding dimensional drawing according to the panel plate ODU Model Panel Plate A VMH18SV 1 X430 D30 A VMH24SV 1 ...

Page 37: ...Service Manual B VMHxxAV 1 Outdoor Unit 3 3 Panel Plate X430 Square grille ...

Page 38: ...Service Manual B VMHxxAV 1 Outdoor Unit 4 4 Panel Plate D30 Square grille ...

Page 39: ...Service Manual B VMHxxAV 1 Outdoor Unit 5 5 2 Service Place Minimim 4 Recommended 12 ...

Page 40: ...ooling 7 5 10 20 30 40 50 Height difference H m Indoor Upper than Outdoor 25 0 917 0 898 0 879 20 0 946 0 926 0 907 0 887 10 0 975 0 955 0 936 0 916 0 896 5 0 995 0 985 0 965 0 945 0 925 0 905 0 1 000 0 990 0 970 0 950 0 930 0 910 Outdoor Upper than Indoor 5 1 000 0 990 0 970 0 950 0 930 0 910 10 0 990 0 970 0 950 0 930 0 910 20 0 970 0 950 0 930 0 910 25 0 950 0 930 0 910 Heating 7 5 10 20 30 40 ...

Page 41: ...r of the unit Data is valid at free field condition Data is valid at nominal operation condition Reference acoustic pressure OdB 20µPa Sound level will vary depending on arrange off actors such as the construction acoustic absorption coefficient of particular room in which the equipment is installed The operating conditions are assumed to be standard ...

Page 42: ...Service Manual B VMHxxAV 1 Outdoor Unit 8 8 A VMH18SV 1 A VMH24SV 1 ...

Page 43: ... mm inch Piping length m ft Elevation m ft Additional Refrigerant Gas Liquid Rated Max Rated Max A VMH18SV 1 12 7 1 2 6 35 1 4 7 5 24 6 30 98 4 0 20 65 6 15g m 0 16oz ft 30g m 0 32oz ft A VMH24SV 1 15 9 3 4 9 52 3 8 7 5 24 6 30 98 4 0 20 65 6 5 Refrigerant Cycle Diagrams ...

Page 44: ... 10 0 4 Electrical Wiring Diagrams ODU Model ODU Wiring Diagram 16022000035849 A VMH18SV 1 A VMH24SV 1 16022000036331 ODU Model ODU Main Printed Circuit Board ODU IPM Printed Circuit Board A VMH18SV 1 17122000048064 A VMH24SV 1 17122000047742 ...

Page 45: ...Service Manual B VMHxxAV 1 ...

Page 46: ... W EEV BLACK RED BLUE OUTDOOR DC FAN CN1 6 CN1 2 CN3 8 CN 8 CN2 0 CN2 1 CN2 7 M SV WAY1 HE AT2 HE AT1 OPTIONAL BLACK RED BLUE OPTIONAL OPTIONAL CN 11 CN2 9 CN3 2 CN4 2 CN2 6 CN3 6 BLACK BLACK RED RED BLUE BLUE BLUE CN3 0 CN 1 OPTIONAL TO P TEMPERATURE N O I T C E T O R P OF COMPRESSOR COMP_ TOP CT1 CT1 OPTIONAL RED WHITE RED RED TERMINAL BLOCK Y G OPTIOna l ...

Page 47: ...Service Manual B VMHxxAV 1 Outdoor unit printed circuit board diagram 17122000047742 1 3 4 6 8 9 5 7 10 12 11 2 13 ...

Page 48: ...nsor T3 ambient temp sensor T4 exhaust temp sensor TP 4 H PRO L RPO CN29 connect to high and low pressure swtich pin1 pin2 pin3 pin4 5VDC pulse wave 5 OLP TEMP SENSOR CN30 connect to compressor top temp sensor 5VDC Pulse wave 6 TESTPORT CN24 used for testing 7 COMPRESSOR U connect to compressor V 0V AC standby W 10 200V AC running 8 DC FAN CN32 connect to DC fan 9 S E CN31 S connect to indoor unit...

Page 49: ...HEAT_D CN8 connect to the heater 208 230V AC when is ON CN20 11 HEAT_Y CN21 CN36 12 4 WAY CN38 connect to 4 way valve 208 230V AC when is ON 13 CN27 connect to key board CN1 Note This section is for reference only Please take practicality as standard ...

Page 50: ... VVB U W V V W U VUB P U VP1 VN1 IPM1 L601 R41 2 IC403 E409 E404 D407 C 40 9 C413 CN7 CN 6 CN2 CN8 C N2 9 CN 28 CN2 7 RY1 L6 L5 DAS1 R601 R301 A C O U T I N R Y 3 A C3 C1 R62 5 R6 23 R 622 R 514 R5 13 C6 11 T1 CN 60 IC202 R1 04 R 60 3 C202 R1 03 AC AC BR1 C 80 1 C8 02 C 10 3 C1 04 C1 05 C 212 C1 14 C1 16 C 208 C20 7 C2 06 C1 11 C 112 C 304 C3 09 C 317 C12 C4 04 C4 05 C 40 8 C60 1 C60 5 C60 4 C 612...

Page 51: ...08 230V AC when is ON 6 TP T4 T3 CN17 connect to pipe temp sensor T3 ambient temp sensor T4 exhaust temp sensor TP 7 PMV CN18 connect to Electric Expansion Valve 8 HEAT1 CN16 connect to compressor heater 208 230V AC when is ON 9 DC FAN CN414 connect to DC fan 10 TESTPORT CN23 used for testing 11 FAN_IPM IPM501 IPM for DC fan 12 COMP_IPM IPM1 IPM for compressor 13 U CN27 connect to compressor V CN2...

Page 52: ...n 3 Indoor Unit Installation 4 Outdoor Unit Installation 5 Drainage Pipe Installation 6 Refrigerant Pipe Installation 7 Vacuum Drying and Leakage Checking 8 Additional Refrigerant Charge 9 Engineering of Insulation 10 Engineering of Electrical Wiring 11 Test Operation Installation ...

Page 53: ...erview L N 1 2 3 MC MC 4 5 6 7 8 Install the indoor unit Install the outdoor unit Install the drainpipe Connect the wires Connect the refrigerant pipes Evacuate the refrigeration system Install the panel only for cassette type Perform a test run Indoor Unit Indoor Unit ...

Page 54: ...three directions M N P M N P 30 cm 11 8 from back wall 60 cm 23 6 on right 30 cm 11 8 on left 200 cm 78 in front 2 4 Rows of series installation The relations between H A and L are as follows L A L H L 1 2H Minimum 4 Rec 12 1 2H L H Minimum 4 Rec 12 L H Can not be installed L H 300 cm 118 or more A 60 cm 23 6 or more 150 cm 59 or more 25 cm 9 8 or more 25 cm 9 8 or more DO NOT install the rows of ...

Page 55: ...tically upward or downward the lower end of the air outlet needs to be connected to the L shaped metal air duct and fastened by screws 3 2 Installation place Vertical installation 24inch min Horizontal installation 24inch min 3 2 Install the main body The unit may be installed in one of the upflow downflow horizontal left or horizontal right orientations Vertical installation Horizontal installati...

Page 56: ...n 1 Open the upper cover 2 Open the cover of the electronic control box 3 Connect the wire according to the wiring diagram 4 Connect the pipes 5 Install the drainage pipes Reversing instructions For the Horizontal left installation and vertical down installation the direction of the evaporator should be changed and the drain pan should be removed first Please do it according to the following steps...

Page 57: ... Room temperature sensor only available for some models T2 Evaporator central temperature sensor NOTE T1 is only available for some models 5 Remove T1 T2 sensor wire ties 6 Take out the evaporator and drain pan and rotate 180o 7 Adjust the position of the mounting parts 8 Reinstall the evaporator and drain pan ...

Page 58: ... needs to pass through the wire groove from the drain pan and be stuck on the hook of the drain pan Cut the foam gasket Remove knockouts as shown in the figure Hook the wire into the buckle and go down from the wire slot Replace foam gaster over wires 10 The evaporator is assembled in place 11 Reinstall evaporator cover plate ...

Page 59: ...al B VMHxxAV 1 3 IDU Installation AHU 12 Connect the wire according to the wiring diagram 13 Reassemble the upper cover 14 Reinstal the flter and flter cover plate 15 Connect the pipes 16 Install the drainage pipes ...

Page 60: ...inch 16 34 24 96 15 9 17 99 590 mm 350 590 378 400 inch 13 78 23 23 14 88 15 75 4 3 Install Outdoor Unit Fix the outdoor unit with anchor bolts M10 60cm 23 6 Fix with bolts Caution Since the gravity center of the unit is not at its physical center so please be careful when lifting it with a sling Never hold the inlet of the outdoor unit to prevent it from deforming Do not touch the fan with hands ...

Page 61: ...able is for reference PVC pipe Reference value of inner diameter of pipe mm Allowable maximum water flowrate l h Remark Slope 1 50 Slope 1 100 PVC25 20 39 27 For branch pipe PVC32 25 70 50 PVC40 31 125 88 Could be used for confluence pipe PVC50 40 247 175 PVC63 51 473 334 Attention Adopt PVC40 or bigger pipe to be the main pipe For Vertical drainage pipe The following table is for reference PVC pi...

Page 62: ...tatic pressure duct unit the water storage pipe should be set to avoid converse flow or blow water phenomena 7 Blowhole setting For the concentrated drainage pipe system there should design a blowhole at the highest point of main pipe to ensure the condensate water discharge smoothly The air outlet shall face down to prevent dirt enter ing pipe Each indoor unit of the system should be installed it...

Page 63: ...ft 36000Btu h unit Indoor unit Outdoor unit Indoor unit Outdoor unit 6 2 The procedure of connecting pipes 1 Choose the pipe size according to the specification table 2 Confirm the cross way of the pipes 3 Measure the necessary pipe length 4 Cut the selected pipe with pipe cutter Make the section flat and smooth Oblique Rough Warped 90 5 Insulate the copper pipe Before test operation the joint par...

Page 64: ...tem and need to go on with drying for half an hour 3 If the vacuum degree of vacuum pump still could not reach 755mmHg after 1 5 hours of drying check whether there is leakage source 4 Leakage test After the vacuum degree reaches 755mmHg stop vacuum drying and keep the pressure for 1 hour If the indicator of vacuum gauge does not go up it is qualified If going up it indicates that there is moistur...

Page 65: ...calculate the charge volume Diameter of liquid pipe mm inch Formula R410A Throttling part in the indoor unit 6 35 1 4 V 30 0 32 g m oz ft L standard pipe length 9 52 3 8 V 65 0 69 g m oz ft L standard pipe length 12 7 1 2 V 115 1 23 g m oz ft L standard pipe length R410A Throttling part in the outdoor unit 6 35 1 4 V 15 0 16 g m oz ft L standard pipe length 9 52 3 8 V 30 0 32 g m oz ft L standard ...

Page 66: ...ction flare the pipe piping layout and connection vacuum drying insulate the joint parts 2 Purpose of refrigerant pipe insulation During operation temperature of gas pipe and liquid pipe shall be over heating or over cooling extremely Therefore it is necessary to carry out in sulation otherwise it shall debase the performance of unit and burn compressor Gas pipe temperature is very low during cool...

Page 67: ...at the place The wiring with different voltage should not be in one wire tube Ensure that the color of the wires of outdoor and the terminal No are same as those of indoor unit respectively Table Minimum Cross Sectional Area able of Power and Signal Cables For North America Rated Current of Appliance A AWG 6 18 6 10 16 10 16 14 16 25 12 25 32 10 For the other regions Rated Current of Appliance A N...

Page 68: ...tat or zone controller has an HUM interface connect the humidifier directly to the HUM and C ports TO HUMIDIFIER WORK HUMIDISTAT 24V control signal or 208 230V power supply CN33 TO HUMIDIFIER HUMIDISTAT 24 VAC G C 3 4 Dehumidification control wiring 1 2 ON S4 DH R HUMIDISTAT Dehumidification control requires indirect humidifier at DH and R Set S4 2 as OFF When the humidity rises and exceeds the se...

Page 69: ...mpeded and draining to a safe location The heating insulation is properly installed The grounding wires are properly connected The length of the piping and the added refrigerant stow capacity have been recorded The power voltage is the correct voltage for the air conditioner CAUTION Failure to perform the test run may result in unit damage property damage or personal injury 3 Test Run Instructions...

Page 70: ...Service Manual B VMHxxAV 1 Contents 1 First Time Installation Check 2 2 Refrigerant Recharge 4 3 Re Installation 5 3 1 Indoor Unit 5 3 2 Outdoor Unit 7 Maintenance ...

Page 71: ... air and moisture from affecting the air conditioner s performance the indoor unit as well as the pipes between the indoor and outdoor unit must be be leak tested and evacuated Leak test soap water method Use a soft brush to apply soapy water or a neutral liquid detergent onto the indoor unit connections and outdoor unit connections If there is gas leakage bubbles will form on the connection Air p...

Page 72: ...inue evacuating for an additional 20 minutes If the pressure does not achieve 0 1 MPa 14 5 Psi after 50 minutes check for leakage If the pressure successfully reaches 0 1 MPa 14 5 Psi fully close the Handle Lo valve then cease vacuum pump operations b Wait for 5 minutes then check whether the gauge needle moves after turning off the vacuum pump If the gauge needle moves backward check wether there...

Page 73: ... purge the air in the charge hose then fully tighten the charge hose with push pin Handle Lo to the service port of 3 way valve 6 Place the charging cylinder onto an electronic scale and record the starting weight 7 Fully open the Handle Lo manifold valve 2 and 3 way valves 8 Operate the air conditioner in cooling mode to charge the system with liquid refrigerant 9 When the electronic scale displa...

Page 74: ...e 3 way valve s gas service port 3 Open the Handle Lo manifold valve to purge air from the charge hose for 5 seconds and then close it quickly 4 Close the 2 way valve 5 Operate the air conditioner in cooling mode Cease operations when the gauge reaches 0 1 MPa 14 5 Psi 6 Close the 3 way valve so that the gauge rests between 0 3 MPa 43 5 Psi and 0 5 MPa 72 5 Psi 7 Disconnect the charge set and moun...

Page 75: ...ound meter indicates 0 1 MPa 14 5 Psi If the meter does not indicate 0 1 MPa 14 5 Psi after 30 minutes continue evacuating for an additional 20 minutes If the pressure does not achieve 0 1 MPa 14 5 Psi after 50 minutes check for leakage If the pressure successfully reaches 0 1 MPa 14 5 Psi fully close the Handle Lo valve then cease vacuum pump operations b Wait for 5 minutes then check whether the...

Page 76: ...acuate the system for approximately one hour Confirm that the compound meter indicates 0 1 MPa 14 5Psi 4 Close the valve Low side on the charge set and turn off the vacuum pump 5 Wait for 5 minutes then check whether the gauge needle moves after turning off the vacuum pump If the gauge needle moves backward check whether there is gas leakage 6 Disconnect the charge hose from the vacuum pump 7 Moun...

Page 77: ...ert the cylinder to ensure a complete liquid charge 5 Open the valve at the bottom of the cylinder for 5 seconds to purge the air in the charge hose then fully tighten the charge hose with push pin Handle Lo to the service port of 3 way valve 6 Place the charging cylinder onto an electronic scale and record the starting weight 7 Fully open the Handle Lo manifold valve 2 and 3 way valves 8 Operate ...

Page 78: ...3 2 Fan Mode 3 3 3 Cooling Mode 3 3 4 Heating Mode Heat Pump Units 4 3 5 Auto Mode 5 3 6 Drying Mode 5 3 7 Forced Operation Function 5 3 8 Timer Function 6 3 9 Sleep Function 6 3 10 Auto Restart Function 6 4 Remote Controller Functions 7 4 1 LCD Wired Remote Controller 7 4 2 Centralized Controller 11 Product Features ...

Page 79: ...ing 1 0 0 0 0 0 1 0 Electric heating 2 0 0 0 0 1 1 0 09 Heating 1 Electric heating 1 4 1 0 1 0 1 0 0 1 10 Heating 1 Electric heating 1 1 0 1 0 0 1 0 1 Heating 2 Electric heating 1 1 1 0 1 0 0 1 Heating 2 Electric heating 1 1 1 0 0 1 Heating 2 Electric heating 1 1 1 0 0 1 0 1 Heating 2 Electric heating 1 1 0 1 0 1 Heating 1 Electric heating 2 1 0 1 0 1 1 0 1 11 Heating 2 Electric heating 2 1 1 0 1 ...

Page 80: ...ient temperature TP Compressor discharge temperature TS Setting temperature Tsc Adjusted setting temperature In this manual such as CDIFTEMP HDIFTEMP2 TCE1 TCE2 etc they are well setting parameter of EEPROM 3 2 Fan Mode When fan mode is activated The outdoor fan and compressor are stopped Temperature control is disabled and no temperature setting is displayed The indoor fan speed can be set to low...

Page 81: ...e than 10 minutes T1 is higher than or equal to Tsc HDIFTEMP2 Note HDIFTEMP2 is EEPROM setting parameter It is 2 C usually If one of the following conditions is satisfied not judge protective time Compressor running frequency is more than test frequency Compressor running frequency is equal to test frequency T4 is more than 15 C or T4 fault Change setting temperature High or sleep function on off ...

Page 82: ...secutively in defrosting mode 3 4 5 Evaporator Coil Temperature Protection When the evaporator temperature exceeds a preset protection value the compressor ceases operation 3 5 Auto Mode This mode can be selected with the remote controller and the temperature setting can be adjusted between 16 C 30 C In auto mode the machine selects cooling heating or fan only mode on the basis of T T T1 TS T Runn...

Page 83: ... time not clock time 3 9 Sleep Function The sleep function is available in cooling heating or auto mode The operational process for sleep mode is as follows When cooling the temperature rises 1 C to not higher than 30 C 86 F every hour After 2 hours the temperature stops rising and the indoor fan is fixed at low speed When heating the temperature decreases 1 C to not lower than 16 C 60 8 F every h...

Page 84: ... a whole day off in a weekly timer schedule 4 Adjust button To set temperature time and timer 5 CONFIRM button To confirm an setting or call up the superior menu 6 TIMER button To set timer on and timer off time of one day 7 FAN SPEED button Usedtoselect the fan speed 8 BACK button Back to previous operation or superior menu 9 Swing Button Press to active vertical swing hold for horizontal swing 1...

Page 85: ... 3 Temperature display 4 Lock indication 5 C F indication 6 Room temperature indication 7 Follow Me function indication 8 Sleep mode indication 9 Electric Auxiliary Heat Turbo function indication some models NOTE AHU models only have turbo functions 10 Left right swing indication some models 11 Clock display 12 On Off timer 13 Timer display ...

Page 86: ...0mm Wiring hole switch box A B 1 Indoor Unit 2 Notch the part for the wiring to pass through with a nipper tool Connect the terminals on the remote controller HA HB and the terminals of the indoor unit HA HB HA and HB do not have polarity For some models The wired controller connects to main control board directly HA HB HA HB Main control board Wired controller ADSS 01 2 3 4 5 6 7 8 9 A B C D EF ...

Page 87: ...trol up to 16 indoor units b When the non polarity controller is connected to several units every air conditioner in network has only one network address to distinguish each other c Address code of air conditioner in LAN is set by code switch ENC1 Duct and Ceiling Floor or ADSS Cassette of the indoor unit and the set range is 0 15 d Note The indoor units are controlled at the same time not indepen...

Page 88: ...he unit is powered off The address can be set from 0 to 63 by the switch Turn on the unit then the address will be effective Note For light commercial aire conditioner with XYE port it can be also connected to BMS Building Management System If there is any CAC central air conditioner connecting with the central controller at the same time please set the address from largest 63 62 61 since the CAC ...

Page 89: ...r DC fan motor Diagnosis and Solution 25 7 4 EH 60 EH 61 EC 53 EC 52 EC 54 EC 56 EC 57 EC 50 EC 5C Open circuit or short circuit of temperature sensor diagnosis and solution 27 7 5 EL 0C Refrigerant Leakage Detection Diagnosis and Solution 28 7 6 EH 0E Water Level Alarm Malfunction Diagnosis and Solution 29 7 7 PC 00 IPM Malfunction or IGBT Over strong Current Protection Diagnosis and Solution 30 ...

Page 90: ...k phase protection diagnosis and solution 41 7 18 PC 45 Outdoor unit IR chip drive failure diagnosis and solution 42 7 19 PC 0L Low ambient temperature protection 42 7 20 PC 30 High pressure protection diagnosis and solution 43 7 21 PC 0A High temperature protection of condenser diagnosis and solution 45 7 22 PC 06 Discharge temperature protection of compressor diagnosis and solution 46 7 23 EH 0b...

Page 91: ...WARNING Electricity remains in capacitors even when the power supply is off Ensure the capacitors are fully discharged before troubleshooting Test the voltage between P and N on back of the main PCB with multimeter If the voltage is lower than 36V the capacitors are fully discharged For models that cannot be measured wait 5 minutes after the power supply is off to ensure that the capacitors are fu...

Page 92: ...n circuit or has short circuited TS27 eh 65 Evaporator coil temperature sensor T2A is in open circuit or has short circuited TS27 EL 0C Refrigerant Leakage Detection for some models TS28 EH 0 Communication error between indoor two chips TS47 EH 0E Water level alarm malfunction TS29 EC 53 Outdoor room temperature sensor T4 is in open circuit or has short circuited TS27 EC 52 Condenser coil temperat...

Page 93: ...nual Ensure that this code is not a temperature reading Troubleshooting Test the unit using the remote control If the unit does not respond to the remote the indoor PCB requires replacement If the unit responds the display board requires replacement LED flash frequency 2 2 Error Display on Two Way Communication Wired Controller Display Malfunction or Protection Solution EH 3 Communication error be...

Page 94: ...33 PC 40 Communication malfunction between IPM board and outdoor main board TS36 pc 41 Outdoor compressor current sampling circuit failure TS49 PC 43 Outdoor compressor lack phase protection TS41 PC 44 Outdoor unit zero speed protection TS37 PC 45 Outdoor unit IR chip drive failure TS42 PC 46 Compressor speed has been out of control TS37 PC 49 Compressor overcurrent failure TS37 EC 52 Condenser co...

Page 95: ...than 9 degree the digital display tube will show 9 If the temp is higher than 70 degree the digital display tube will show 70 If the indoor unit is not connected the digital display tube will show 05 Condenser pipe temp T3 06 Outdoor ambient temp T4 07 Compressor discharge temp TP The display value is between 0 199 degree If the temp is lower than 0 degree the digital display tube will show 0 If t...

Page 96: ... 8 960 15 The average value of the temperature values detected by the high and low pressure sensors in the last 10 seconds of the compressor frequency calculation period The displayed value is the actual value plus 60 that is when the displayed value is 10 the actual value is 50 When the displayed value is higher than 99 the digital display tube will show single digit and tens digit if it displays...

Page 97: ... to exit Set within 1 minute after power on 2 T2 temperature press On Off for 2s to enter the Internal Fan Control Selector after the pre set temperature is reaches the code displayed is Ch press OK to send the Query Internal Fan Control Selector code press the Up Down key to select 1 to 11 1 Stop the fan 2 Min air speed 3 Set the air speed 4 Termal running for 5min press OK to confirm and press O...

Page 98: ...to send the Query Max Running Frequency Selector code of the restricted area 6 in the cooling mode T4 press the Up Down key to select the limit then press OK to confirm and press On Off for 2s to exit for some models 14 Actual Running Speed ir of the indoor fan 15 Indoor Humidity Hu press On Off for 2s to enter the Outdoor Forced Running Frequency Selector the code displayed is Ch press OK to send...

Page 99: ...eating Temperature Compensation Value Settings the code displayed is Ch press OK to send the Query Heating Temperature Compensation Value code press the Up Down key to select the heating temperature compensation value then press OK and press On Off for 2s to exit 23 Reserved 24 25 26 27 28 29 30 In Channel 1 30 settings of the engineer mode long press the On off key to return the previous engineer...

Page 100: ...oor room temperature sensor T1 is in open circuit or has short circuited Eh 61 Evaporator coil temperature sensor T2 is in open circuit or has short circuited EH 62 Evaporator coil temperature sensor T2B is in open circuit or has short circuited eh 65 Evaporator coil temperature sensor T2A is in open circuit or has short circuited EC 07 The outdoor fan speed is operating outside of the normal rang...

Page 101: ...stomers before field maintenance No Problem Solution 1 Unit will not start TS15 TS16 2 The power switch is on but fans will not start TS15 TS16 3 The temperature on the display board cannot be set TS15 TS16 4 Unit is on but the wind is not cold hot TS15 TS16 5 Unit runs but shortly stops TS15 TS16 6 The unit starts up and stops frequently TS15 TS16 7 Unit runs continuously but insufficient cooling...

Page 102: ...not start TS17 TS18 5 Condenser Outdoor fan will not start TS17 TS18 6 Unit runs but shortly stops TS17 TS18 7 Compressor short cycles due to overload TS17 TS18 8 High discharge pressure TS17 TS18 9 Low discharge pressure TS17 TS18 10 High suction pressure TS17 TS18 11 Low suction pressure TS17 TS18 12 Unit runs continuously but insufficient cooling TS17 TS18 13 Too cool TS17 TS18 14 Compressor is...

Page 103: ...Service Manual B VMHxxAV 1 Troubleshooting 15 ...

Page 104: ...art The power switch is on but fans will not start The temperature on the display board cannot be set Unit is on but the wind is not cold hot Unit runs but shortly stops The unit starts up and stops frequently Unit runs continuously but insufficient cooling heating Cool can not change to heat Unit is noisy Test method remedy Check heat load Tighten bolts or screws Close all the windows and doors R...

Page 105: ...or will not start but fans run Compressor and condenser outdoor fan will not start Evaporator indoor fan will not start Condenser Outdoor fan will not start Unit runs but shortly stops Compressor short cycles due to overload High discharge pressure Low discharge pressure High suction pressure Low suction pressure Unit runs continuously but insufficient cooling Too cool Compressor is noisy Horizont...

Page 106: ...ill not start Condenser Outdoor fan will not start Unit runs but shortly stops Compressor short cycles due to overload High discharge pressure Low discharge pressure High suction pressure Low suction pressure Unit runs continuously but insufficient cooling Too cool Compressor is noisy Horizontal louver can not revolve Test method remedy Test voltage Inspect fuse type size Inspect connections tight...

Page 107: ...x x x x T2B Sensor x x x x x x x x x T2A Sensor x x x x x x x x x T3 Sensor x x x x x x x x x x T4 Sensor x x x x x x x x x Reactor x x x x x x x x x Compressor x x x x x x x x x x Additional refrigerant x x x x x x x x x Water level switch x x x x x x x x x Water pump x x x x x x x x x Part requiring replacement EC 54 EC 51 EC 5C EC 52 EC 07 71 72 73 PC 00 PC 01 PC 02 PC 04 PC 03 Indoor PCB x x x...

Page 108: ...x Additional refrigerant x x x x Part requiring replacement PC 41 PC 43 PC 10 11 12 PC 30 PC 31 PC 40 Indoor PCB x x x x x x Outdoor PCB Outdoor fan motor x x x x x T3 Sensor x x x x x x TP Sensor x x x x x x Pressure sensor x x x x x x Reactor x x x x x Compressor x x x x x IPM module board x x x x Data adapter board x x x x x x High pressure valve assy x x x x x x High pressure protector x x x x...

Page 109: ...0 outdoor main PCB EC 51 The unit is operating normally NO Remarks EEPROM A read only memory whose contents can be erased and reprogrammed using a pulsed voltage The location of the EEPROM chip on the indoor and outdoor PCB is shown in the following two images Note For certain models outdoor PCB could not be removed separately In this case the outdoor electric control box should be replaced as a w...

Page 110: ...out and insert back Pull out and insert back No No Replace indoor main PCB is the error distinguished Replace indoor main PCB is the error distinguished Yes Replace the outdoor main PCB Replace the outdoor main PCB No Check whether there s any interference Such as too many lamps power transformers Or the signal wire is too long Check whether there s any interference Such as too many lamps power tr...

Page 111: ...ent short circuit Unplug electronic expansion valve Check if power LED is on No No Check the AC voltage of L N output to IPM board is it same as power input Check the DC 5V 12V from IPM board to main PCB are they normal Unplug all the high voltage components connected to main PCB such as 4 way valve heater AC fan one by one to check their resistance Is there any component short circuit Yes No Unpl...

Page 112: ...alternately as positive values and negative values If the outdoor unit has malfunction the voltage has always been the positive value While if the indoor unit has malfunction the voltage has always been a certain value Use a multimeter to test the resistance of the reactor which does not connect with capacitor The normal value should be around zero ohm Otherwise the reactor must have malfunction N...

Page 113: ...mbly Fan motor PCB Troubleshooting and repair YES Power off then restart the unit after 2 minutes Is it within normal parameters Replace the fan motor Does a problem remain The unit is operating normally NO Shut off the power supply Rotate the fan by hand YES Does it turn easily Find the cause of the problem and resolve it NO Check the wiring of fan motor YES Is it improperly wired Ensure proper c...

Page 114: ...e the PCB must has problems and need to be replaced CN34 NO Color Signal Voltage 1 2 Black GND 3 Orange PWM 5 12VDC 4 Blue FG CN15 NO Color Signal Voltage 1 Yellow 208 230VAC 2 Black 208 230VAC 3 Yellow Green GND 2 Outdoor DC Fan Motor control chip is in outdoor PCB Release the UVW connector Measure the resistance of U V U W V W If the resistance is not equal to each other the fan motor must has p...

Page 115: ...wires Sensors PCB Troubleshooting and repair Check the connection between temperature sensor and PCB Replace indoor PCB E4 E5 or outdoor PCB F1 F2 F3 Is it within acceptable parameters Is it properly wired Ensure proper connections NO Measure the resistance value of the sensor YES Replace the sensor NO YES Note For certain models outdoor PCB could not be removed separately In this case the outdoor...

Page 116: ...door PCB Additional refrigerant Troubleshooting and repair Power off then restart the unit 15 minutes later Are any leakages present Put your hands in front of the indoor air outlet Is there cool or heat air blowing out from indoor air outlet Ensure proper connections Check system for leakages NO NO Repair the leakage and recharge the refrigerant YES NO Is T2 loose YES YES Is T1 too close to the e...

Page 117: ... problem remain Does a problem remain YES Is the water level switch inserted properly Is the water level switch inserted properly Replace the indoor main PCB Replace the indoor main PCB YES The unit is operating normally The unit is operating normally NO Insert the water level switch properly Insert the water level switch properly NO Is the water level switch broken Is the water level switch broke...

Page 118: ...CB and compressor Does an error exist Ensure proper connections or replace the wires and connectors YES Check the IPM NO Is it in working order Replace the IPM board or replace the outdoor PCB NO Check the outdoor fan and the outdoor unit ventilation YES Is it in working order Please refer to the solution of the Fan Speed is Out of Control malfunction NO Check the compressor resistance values YES ...

Page 119: ...r Check the power supply Is it in working order Turn off the unit NO Check the connections and wires YES Are they in working order Ensure proper connections or replace the wires NO Power on and measure the voltage between P and N YES While the unit is in standby is the voltage between P and N is around DC 310V 340V or 380V When start up the unit is it in 220V 400V Replace the IPM board NO Check th...

Page 120: ...repair Check the wiring between the PCB and compressor Is it improperly wired Ensure proper connections or replace the wires and connectors YES Check the IPM NO Is it functioning properly Replace the IPM board or replace the outdoor PCB NO Check the outdoor fan and the outdoor unit ventilation YES Is it functioning properly Please refer to Fan Speed Malfunction NO Check the compressor resistance v...

Page 121: ...he high pressure valve fully opened Is the indoor fan running properly in cooling mode Is the indoor fan running properly in cooling mode Refer to the solution to the malfunction of fan speed being out of control Find the cause and resolve the problem Refer to the solution to the malfunction of fan speed being out of control Find the cause and resolve the problem No Yes Yes Check whether the refri...

Page 122: ...ystem blockages Troubleshooting and repair Check if the air flow system of indoor and outdoor units are obstructed Clear up the air inlet and outlet or the heat exchanger of indoor and outdoor units Yes No Yes Yes Turn off the power supply and turn it on 10 minutes later Check if the temperature of compressor Top Is more than 90 No Check if the refrigerant system is normal Repair the refrigerant s...

Page 123: ... unit is error Recommended parts to prepare Outdoor unit Troubleshooting and repair Is the main board displaying an error Is the main board displaying an error Power off then restart the unit 2 minutes later Does the outdoor main board display an error code a few minutes later Power off then restart the unit 2 minutes later Does the outdoor main board display an error code a few minutes later No Y...

Page 124: ...he signal wire between the IPM board and the main board is it connected properly Check the signal wire between the IPM board and the main board is it connected properly Reconnect and retry Is the error still displayed Reconnect and retry Is the error still displayed Replace IPM board Is the system running normally Replace IPM board Is the system running normally Replace the electric control box Re...

Page 125: ...control PC 49 Compressor overcurrent failure diagnosis and solution Description An abnormal current rise is detected by checking the specified current detection circuit Recommended parts to prepare Connection wires Rectifier PFC circuit or reactor Blocked refrigeration piping system Pressure switch Outdoor fan IPM module board Outdoor PCB Troubleshooting and repair ...

Page 126: ...r or inductance properly wired Is the wiring of the reactor or inductance properly wired Reconnect the wiring Reconnect the wiring No Are the reactor and inductance functioning normally Are the reactor and inductance functioning normally Yes Replace reactor or inductance Replace reactor or inductance No Is the outdoor ambient temperature is higher than 50 Is the outdoor ambient temperature is high...

Page 127: ...the PFC module is connected tightly Check whether the connecting line between main board and the PFC module is connected tightly Yes Measure whether the voltage between P and N is normal refer to the Index Measure whether the voltage between P and N is normal refer to the Index No Check whether the inductance of PFC module is good If the inductance is good the resistance of the two ports is 0 Chec...

Page 128: ... code Recommended parts to prepare Connection wire Fan motor Outdoor PCB Troubleshooting and repair Check the fan three phase output for obvious open circuit Power off then restart the unit 2 minutes later Is it still displaying the error code The unit operates normally Check the wiring of fan motor Are all the connections good Correct the connections Check whether the three phase resistance of th...

Page 129: ...d parts to prepare Connection wire Compressor Outdoor PCB Troubleshooting and repair Check the compressor three phase output for obvious open circuit Power off then restart the unit 2 minutes later Is it still displaying the error code The unit operates normally Check both ends of compressor connecting line Are all the connections good Correct the connections Check whether the three phase resistan...

Page 130: ...then restart the unit 2 minutes later Replace the inverter module PCB Yes 7 19 PC 0L Low ambient temperature protection Description It is a protection function When compressor is off outdoor ambient temperature T4 is lower than 35o C for 10s the AC will stop and display the failure code When compressor is on outdoor ambient temperature T4 is lower than 40o C for 10s the AC will stop and display th...

Page 131: ...h pressure protection diagnosis and solution Description Outdoor pressure switch cut off the system because high pressure is higher than 4 4 MPa Recommended parts to prepare Connection wires Pressure switch Outdoor fan Outdoor main PCB Troubleshooting and repair ...

Page 132: ...the heat exchanger dirty Is the heat exchanger dirty No Yes Replace outdoor main board Is the problem resolved Replace outdoor main board Is the problem resolved No High pressure protection High pressure protection Is the outdoor fan running properly Is the outdoor fan running properly No Yes NO Connect high pressure switch and mian control board Connect high pressure switch and mian control board...

Page 133: ...properly Yes Ensure that the outdoor unit ventilate is functioning properly Ensure that the outdoor unit ventilate is functioning properly Is the heat exchanger dirty Is the heat exchanger dirty No Clean the heat exchanger Clean the heat exchanger Yes Check whether the refrigerant system is functioning normally Check whether the refrigerant system is functioning normally Replace outdoor main board...

Page 134: ...ant leaking Are the compressor discharge temperature sensor and PCB connected properly according to the wiring diagram Are the compressor discharge temperature sensor and PCB connected properly according to the wiring diagram Is the compressor discharge temperature more than 115 C R410a 108 C R32 Is the compressor discharge temperature more than 115 C R410a 108 C R32 Is the value normal Is the val...

Page 135: ...e Indoor main board Adapter board Troubleshooting and repair Check the connection wires between the adaptor board and the main board is it connected properly Reconnect and retry Is the error still displayed Replace the transfer board Is the system running normally Replace indoor main board Yes No No No Trouble is resolved Yes Shut off the power supply and turn it on 2 minutes later Is it still dis...

Page 136: ...S Power off then restart the unit after 3 minutes Does the error still exist Replace the outdoor main control board Does a problem remain The unit is operating normally NO Check the wirings and connections YES Are all the connections good Ensure proper connections NO YES Replace the adapter main PCB The problem is solved NO 7 25 Indoor and outdoor mismatch malfunction diagnosis and solution Descri...

Page 137: ...ting normally NO 7 27 EH b3 Communication error between wired controller and indoor unit Diagnosis and Solution Description If Indoor PCB does not receive feedback from wired controller the error displays on the wired controller Recommended parts to prepare Connection wires Indoor PCB Wired controller Troubleshooting and repair YES Power off then restart the unit after 2 minutes Does the error sti...

Page 138: ...mbly and Chapter 6 Outdoor Disassembly 2 Measure the resistance value of the sensor using a multi meter 3 Check corresponding temperature sensor resistance value table Refer to Chapter 8 Appendix Note The picture and the value are only for reference actual condition and specific value may vary 8 2 Compressor Check 1 Disconnect the compressor power cord from outdoor PCB Refer to Chapter 6 Outdoor U...

Page 139: ...3UFZ2 ATF250D22UMT KTF250D22UMT ATF310D43UMT KSK103D33UEZ3 ASM98D32UFZ Blue Red 1 87Ω 0 75Ω 0 65Ω 2 13Ω 2 2Ω Blue Black Red Black Resistance Value ASN140D21UFZ ASK89D29UEZD KSN140D21UFZ KTM240D57UMT KSN140D58UFZ Blue Red 1 28Ω 1 99Ω 1 28Ω 0 62Ω 1 86Ω Blue Black Red Black Resistance Value KTF310D43UMT KTQ420D1UMU ATN150D30UFZA KTM240D43UKT EAPQ420D1UMUA Blue Red 0 65Ω 0 37Ω 1 03Ω 0 37Ω Blue Black R...

Page 140: ...sure the capacitors are fully discharged before troubleshooting 1 Turn off outdoor unit and disconnect power supply 2 Discharge electrolytic capacitors and ensure all energy storage unit has been discharged 3 Disassemble outdoor PCB or disassemble IPM board 4 Measure the resistance value between P and U V W N U V W and N Digital tester Resistance value Digital tester Resistance value Red Black Sev...

Page 141: ... reference actual condition and specific value may vary Normal voltage of P and N 208 240V 1 phase 3 phase 380 415V 3 phase In standby around 310VDC around 530VDC In operation With passive PFC module With partial active PFC module With fully active PFC module 200VDC 310VDC 370VDC 450VDC ...

Page 142: ...Service Manual B VMHxxAV 1 Contents 1 Indoor Unit Disassembly 1 1 1 Electrical Parts 2 1 2 Fan Motor and Fan 5 1 3 Evaporator 7 Indoor Unit Disassembly Air Handle ...

Page 143: ...worn Procedure Illustration 1 Remove 2 screws of the upper cover Plate assembly and then remove the it see CJ_AHU_001 2 Remove 2 screws and unplug the plugs see CJ_AHU_002 3 Pull out the electric control box subassembly see CJ_AHU_002 CJ_AHU_001 CJ_AHU_002 Note This section is for reference only Actual unit appearance may vary ...

Page 144: ...d 1earthing screw see CJ_AHU_003 5 Unplug the plugs and then remove the main control board subassembly see CJ_AHU_003 6 Release 1 fixing screw of the data transfer module control board to remove it see CJ_AHU_004 CJ_AHU_003 CJ_AHU_004 Note This section is for reference only Actual unit appearance may vary ...

Page 145: ...ual B VMHxxAV 1 Indoor Unit Disassembly 4 Procedure Illustration 7 Release 2 screws and then remove the transformer see CJ_AHU_005 CJ_AHU_005 Note This section is for reference only Actual unit appearance may vary ...

Page 146: ...sassembly 5 1 2 Fan Motor and Fan Procedure Illustration 1 Remove 2 screws of fan assembly see CJ_AHU_006 2 Take out the fan assembly see CJ_ AHU_007 CJ_AHU_006 CJ_AHU_007 Note This section is for reference only Actual unit appearance may vary ...

Page 147: ...llustration 3 Release 3 nuts fixing the fan motor and then take out the fan motor see CJ_AHU_008 4 Release the 1 nut fixing the fan and then take out the fan see CJ_AHU_009 CJ_AHU_008 CJ_AHU_009 Note This section is for reference only Actual unit appearance may vary ...

Page 148: ...ssembly 7 1 4 Evaporator Procedure Illustration 1 Remove the cover plate see CJ_ AHU_010 2 Remove 3 screws of cover plate assembly below see CJ_AHU_011 CJ_AHU_010 CJ_AHU_011 Note This section is for reference only Actual unit appearance may vary ...

Page 149: ... Take out the evaporator with water collector assembly see CJ_AHU_012 4 Remove 2 screws of water collector assembly see CJ_AHU_013 4 Release evaporator and the water collector assembly CJ_AHU_012 CJ_AHU_013 Note This section is for reference only Actual unit appearance may vary ...

Page 150: ... Outdoor Unit Table 2 2 Outdoor Unit Disassembly 3 2 1 Panel Plate 3 2 2 Electrical Parts 1 10 0 2 3 Fan Assembly 1 13 3 2 4 Fan Motor 1 14 4 2 5 Sound Blanket 1 15 5 2 6 Four way Valve 1 16 6 2 7 Compressor 1 17 7 Outdoor Unit Disassembly ...

Page 151: ...Service Manual B VMHxxAV 1 Outdoor Unit Disassembly 2 1 Outdoor Unit Disassembly 1 1 Outdoor Unit Table Outdoor Unit Model Panel Plate PCB Board 18AV 1 X430 PCB Board 3 24AV 1 D30 PCB Board 10 ...

Page 152: ... 1 Turn off the air conditioner and the power breaker 2 Remove the screw of the big handle and then remove the big handle 1 screw see CJ_X430_001 3 Remove the screws of the top cover and then remove the top cover 3 screws One of the screws is located underneath the big handle see CJ_ X430_002 CJ_X430_001 CJ_X430_002 Note This section is for reference only Actual unit appearance may vary Big Handle...

Page 153: ...hen remove the water collecting cover 2 screws see CJ_ X430_003 5 Remove the screws of the front panel and then remove the front panel 7 screws onoff models or 9 screws inverter models see CJ_ X430_004 CJ_X430_003 CJ_X430_004 Note This section is for reference only Actual unit appearance may vary Water Collecting Cover Front Panel ...

Page 154: ... Unit Disassembly 5 5 Procedure Illustration 6 Remove the screws of the right panel and then remove the right panel 6 screws see CJ_X430_005 CJ_X430_005 Note This section is for reference only Actual unit appearance may vary Right Panel ...

Page 155: ...ve the screws of the big handle and then remove the big handle 2 screws see CJ_D30_001 3 Remove the screws of the top cover and then remove the top cover 4 screws Two of the screws is located underneath the big handle see CJ_ D30_002 CJ_D30_001 CJ_D30_002 Note This section is for reference only Actual unit appearance may vary Big Handle Top Cover ...

Page 156: ... the front right panel and then remove the front right panel 2 screws see CJ_D30_003 5 Remove the screws of the front panel and then remove the front panel 9 screws see CJ_D30_004 CJ_D30_003 CJ_D30_004 Note This section is for reference only Actual unit appearance may vary Front Panel Front Right Panel ...

Page 157: ...r collecting cover and then remove the water collecting cover 2 screws see CJ_ D30_005 7 Remove the screws of the rear net and then remove the rear net 2 screws see CJ_D30_006 for some models CJ_D30_005 CJ_D30_006 Note This section is for reference only Actual unit appearance may vary Water Collecting Cover ...

Page 158: ...r Unit Disassembly 9 9 Procedure Illustration 8 Remove the screws of the right panel and then remove the right panel 8 screws see CJ_D30_007 CJ_D30_007 Note This section is for reference only Actual unit appearance may vary Right Panel ...

Page 159: ...Electric control box cover cannot be removed so the voltage between P and N cannot be measured CJ_ODU_PCB_003 1 Note This section is for reference only Actual unit appearance may vary 2 2 Electrical parts WARNING Antistatic gloves must be worn when you disassemble the electronic box Note Remove the air outlet grille refer to 3 1 Panel Plate before disassembling electrical parts 1 1 P PC CB B b bo ...

Page 160: ...ver 4 hooks see CJ_ODU_PCB_010 1 2 Remove 6 screws on the electronic control board and then remove the electronic control box subassembly see CJ_ODU_PCB_010 2 Note Electronic installing box cannot be opened so the voltage between P and N cannot be measured CJ_ODU_PCB_010 1 CJ_ODU_PCB_010 2 Note This section is for reference only Actual unit appearance may vary ...

Page 161: ...12 2 Procedure Illustration 3 Pull out the connector remove one screw and then remove the key board subassembly on terminal board see CJ_ODU_PCB_010 3 for some models CJ_ODU_PCB_010 3 Note This section is for reference only Actual unit appearance may vary ...

Page 162: ...ve the panel plate refer to 3 1 Panel Plate before disassembling fan Procedure Illustration 1 Remove the nut securing the fan with a spanner see CJ_ODU_ FAN_001 1 2 2 Remove the fan CJ_ODU_FAN_001 1 CJ_ODU_FAN_001 2 Note This section is for reference only Actual unit appearance may vary ...

Page 163: ...ction of fan motor on PCB refer to 3 1 Panel Plate and 3 2 Electrical parts before disassembling fan motor Procedure Illustration 3 Remove the fixing screws of the fan motor 4 screws see CJ_ODU_MOTOR_001 4 Remove the fan motor CJ_ODU_MOTOR_001 Note This section is for reference only Actual unit appearance may vary ...

Page 164: ...l plate before disassembling sound blanket Procedure Illustration 1 Remove the sound blanket side and top see CJ_ODU_BLANKET_001 CJ_ODU_BLANKET_001 Note This section is for reference only Actual unit appearance may vary Sound Blanket side Applicable to models with blanket Sound Blanket top Applicable to models with blanket ...

Page 165: ...gen then repeat the two steps before heating up the brazed parts The operations above should be implemented by professionals Note Remove the panel plate connection of four way valve on PCB refer to 3 1 Panel plate and 3 2 Electrical parts before disassembling sound blanket Procedure Illustration 1 Heat up the brazed parts and then detach the the four way valve and the pipe see CJ_ODU_VALVE_001 2 R...

Page 166: ...o steps before heating up the brazed parts The operations above should be implemented by professionals Note Remove the panel plate connection of compressor on PCB refer to 3 1 Panel plate and 3 2 Electrical parts before disassembling sound blanket Procedure Illustration 1 Remove the flange nut of terminal cover and remove the terminal cover see CJ_ ODU_COMP_001 2 Disconnect the connectors see CJ_O...

Page 167: ...ated on the bottom plate see CJ_ODU_COMP_003 4 Heat up the brazed parts and then remove the the discharge pipe and the suction pipe see CJ_ODU_COMP_004 5 Lift the compressor from the base pan assembly with pliers CJ_ODU_COMP_003 CJ_ODU_COMP_004 Note This section is for reference only Actual unit appearance may vary Discharge Pipe Suction Pipe ...

Page 168: ...Manual B VMHxxAV 1 Contents i Temperature Sensor Resistance Value Table for T1 T2 T3 and T4 C K 2 ii Temperature Sensor Resistance Value Table for TP for some units C K 3 iii Pressure On Service Port 4 Appendix ...

Page 169: ... 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 1 17393 120 248 0 35982 1 34 33 3269 41 106 4 96392 81 178 1 13604 121 250 0 35042 2 36 31 5635 42 108 4 76253 82 180 1 09958 122 252 0 3413 3 37 29 9058 43 109 4 5705 83 181 1 06448 123 253 0 33246 4 39 28 345...

Page 170: ...23 234 9 35 95 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 39 102 30 36 79 174 7 086 119 246 2 174 0 32 180 9 40 104 29 15 80 176 6 859 120 248 2 117 1 34 171 9 41 106 28 81 178 6 641 121 250 2 061 2 36 163 3 42 108 26 9 82 180 6 43 122 252 2 007 3 3...

Page 171: ... 7 8 9 6 10 5 10 3 9 5 10 0 10 6 12 4 13 0 PSI 70 59 21 11 15 93 94 106 116 119 113 117 125 147 154 75 63 23 89 17 22 97 99 115 125 124 120 126 132 155 162 80 67 26 67 19 44 103 104 123 138 135 129 132 140 162 173 90 73 32 22 22 78 112 113 139 152 149 138 145 154 180 189 MPa 70 59 21 11 15 0 64 0 65 0 73 0 8 0 82 0 78 0 81 0 86 1 01 1 06 75 63 23 89 17 22 0 67 0 68 0 79 0 86 0 86 0 83 0 87 0 91 1 ...

Page 172: ...8 5 25 3 22 8 20 8 18 5 16 5 65 18 33 32 5 30 0 26 6 25 4 23 3 20 5 19 0 75 23 89 33 8 31 5 27 8 26 3 24 9 21 5 20 0 PSI 55 12 78 439 413 367 330 302 268 239 65 18 33 471 435 386 368 339 297 276 75 23 89 489 457 403 381 362 312 290 MPa 55 12 78 3 03 2 85 2 53 2 28 2 08 1 85 1 65 65 18 33 3 25 3 00 2 66 2 54 2 33 2 05 1 90 75 23 89 3 38 3 15 2 78 2 63 2 49 2 15 2 00 0 0 5 1 1 5 2 2 5 3 3 5 4 55 65 ...

Page 173: ...0 6 6 6 4 5 9 6 3 6 6 7 8 8 1 PSI 70 59 21 11 15 58 59 67 73 74 71 74 78 91 96 75 63 23 89 17 22 61 62 71 78 78 75 78 83 97 102 80 67 26 67 19 44 64 65 77 86 84 81 83 87 102 107 90 73 32 22 22 78 70 71 87 96 93 86 91 96 113 117 MPa 70 59 21 11 15 0 40 0 41 0 46 0 50 0 51 0 49 0 51 0 54 0 63 0 66 75 63 23 89 17 22 0 42 0 43 0 49 0 54 0 54 0 52 0 54 0 57 0 67 0 70 80 67 26 67 19 44 0 44 0 45 0 53 0 ...

Page 174: ... 17 8 15 8 14 3 13 0 11 6 10 3 65 18 33 20 3 18 8 16 6 15 9 14 6 12 8 11 9 75 23 89 21 1 19 7 17 3 16 4 15 6 13 4 12 5 PSI 55 12 78 274 258 229 207 189 168 149 65 18 33 294 273 241 231 212 186 172 6 75 23 89 306 286 251 238 226 194 181 MPa 55 12 78 1 89 1 78 1 58 1 43 1 30 1 16 1 03 65 18 33 2 03 1 88 1 66 1 59 1 46 1 28 1 19 75 23 89 2 11 1 97 1 73 1 64 1 56 1 34 1 25 0 0 5 1 1 5 2 2 5 55 65 75 ...

Page 175: ... 9 7 10 2 10 8 12 6 13 3 PSI 70 59 21 11 15 95 96 108 118 121 115 119 128 150 157 75 63 23 89 17 22 99 101 117 128 126 122 129 135 158 165 80 67 26 67 19 44 105 106 125 141 138 132 135 143 165 176 90 73 32 22 22 78 114 115 142 155 152 141 148 157 184 193 MPa 70 59 21 11 15 0 65 0 66 0 74 0 82 0 84 0 80 0 83 0 88 1 03 1 08 75 63 23 89 17 22 0 68 0 69 0 81 0 88 0 88 0 85 0 89 0 93 1 09 1 14 80 67 26...

Page 176: ... 1 25 8 23 3 21 2 18 9 16 8 65 18 33 33 2 30 6 27 1 25 9 23 8 20 9 19 4 75 23 89 34 5 32 1 28 4 26 8 25 4 21 9 20 4 PSI 55 12 78 448 421 374 337 308 273 244 65 18 33 480 444 394 375 346 303 282 75 23 89 499 466 411 389 369 318 296 MPa 55 12 78 3 09 2 91 2 58 2 33 2 12 1 89 1 68 65 18 33 3 32 3 06 2 71 2 59 2 38 2 09 1 94 75 23 89 3 45 3 21 2 84 2 68 2 54 2 19 2 04 0 0 5 1 1 5 2 2 5 3 3 5 4 55 65 7...

Page 177: ...101 5 10 92 51 656 2200 22 319 55 512 131 922 750 7 5 108 75 13 249 55 848 2250 22 5 326 25 56 527 133 749 800 8 116 15 465 59 837 2300 23 333 5 57 526 135 547 850 8 5 123 25 17 58 63 644 2350 23 5 340 75 58 508 137 314 900 9 130 5 19 604 67 287 2400 24 348 59 475 139 055 950 9 5 137 75 21 547 70 785 2450 24 5 355 25 60 427 140 769 1000 10 145 23 415 74 147 2500 25 362 5 61 364 142 455 1050 10 5 1...

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