Page 2 - Service Manual; VMH SerieS; CONTENTS
2 Service Manual VMH SerieS Heat Controller, Inc. CONTENTS 1.General Information of Outdoor Units ........................................................... 3 2. Features........................................................................................................... 4 3. Dimensions ........
Page 3 - General information of Outdoor Units; Model name
3 Heat Controller, Inc. VMH SerieS Service Manual 2 1. General information of Outdoor Units Model name Dimension mm(in) Compressor A-VMH18DC-1 845x320x700(33.3x12.6x27.6) DA130S1C-20FZ A-VMH27TC-1 845x320x700(33.3x12.6x27.6) DA150S1C-20FZ A-VMH36QC-1 990x345x965(39x13.6x38) TNB306FPGMC-L
Page 4 - Features; Operates only in heating mode except during defrosting.
4 Service Manual VMH SerieS Heat Controller, Inc. 3 2 ． Features The hydrophilic fin is corrosion resistant and improves heating efficiency in heat mode by absorbing the water on its surface and by spreading the water instead of forming water droplets. Operates only in heating mode except during def...
Page 5 - Model
5 Heat Controller, Inc. VMH SerieS Service Manual 4 3. Dimensions mm(in) Model W D H W1 A B A-VMH18DC-1 845((33.3) 320(12.6) 700(27.6) 908(35.7) 560(22) 335(13.2) A-VMH24TC-1 A-VMH36QC-1 990(39) 345(13.6) 965(38) 1075(42.3) 624(24.6) 366(14.4)
Page 8 - Refrigeration Cycle Diagram
8 Service Manual VMH SerieS Heat Controller, Inc. 7 5. Refrigeration Cycle Diagram 8.1 Refrigeration circuit drawing of inverter dual zone: A-VMH18DC-1 LIQUID VALVE A GAS VALVE A HEAT EXCHANGE (EVAPORATOR) HEAT EXCHANGE (CONDENSER) Compressor 4-WAY VALVE COOLINGHEATING T2 Evaporator temp. sensor T1 ...
Page 10 - Indoor units combination; Combinations; Combinations
10 Service Manual VMH SerieS Heat Controller, Inc. 9 6. Indoor units combination NOTE: The total capacity of indoor air handlers can not exceed the nominal capacity of the outdoor unit. The minimum quantity of indoor air handlers is one on any outdoor unit, whether it is a dual, tri, or quad zone. 6...
Page 11 - Installation Details; Wrench torque sheet for installation
11 Heat Controller, Inc. VMH SerieS Service Manual 10 7. Installation Details 7.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque mm inch N . m N . m Ф6.35 1/4 15(153kgf.cm) 16(163kgf.cm) Ф9.52 3/8 25(255kgf.cm) 26(265kgf.cm) Ф12.7 1/2 35(357kgf.cm) 36(367kg...
Page 12 - Installation for the first time; Air purging with vacuum pump
12 Service Manual VMH SerieS Heat Controller, Inc. 11 7.4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as indicated below: ● Pressure in the system rises. ● Operating current rises. ● Cooling or heating efficiency drops. ● Moisture in the refrig...
Page 13 - minutes after turning off the vacuum pump).; Air purging by refrigerant; Be sure to use a hexagonal wrench to operate the valve stems.
13 Heat Controller, Inc. VMH SerieS Service Manual 12 the pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage points. Once the meter indicates -0.1mpa, fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump. Confirm...
Page 14 - Be sure to check for gas leakage using soap water.
14 Service Manual VMH SerieS Heat Controller, Inc. 13 7). Replace the valve stems nuts and the service port cap that were previously removed. Be sure to use a torque wrench to tighten the service port cap to a torque of 18N · m. Be sure to check for gas leakage using soap water. 3. Adding the refrig...
Page 15 - Adding the refrigerant due to loss of charge; ) Operate the air conditioner in the cooling mode.
15 Heat Controller, Inc. VMH SerieS Service Manual 14 6).When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose. 7). Replace the valve stem ca...
Page 16 - conditioner before disconnecting the hose.; Replacing the indoor unit; Collecting the refrigerant into the outdoor unit
16 Service Manual VMH SerieS Heat Controller, Inc. 15 side), disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose. 7). Replace the valve stem caps and the service port that were previously removed. Use torque wrench...
Page 17 - Air purging by the refrigerant; Leave the valve on the charging cylinder closed.
17 Heat Controller, Inc. VMH SerieS Service Manual 16 Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa. Disconnect the charge set, and tighten the 2-way and 3-way valve’s stem nuts. Use a torque wrench to tighten the 3-way valves service port cap to a torque of 1.8 N.m. Be sure to ...
Page 18 - position; Replacing the outdoor unit; the whole system
18 Service Manual VMH SerieS Heat Controller, Inc. 17 2-way valve approximately 45° until the gauge indicates 0.3 to 0.5 Mpa. 6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems....
Page 19 - Refrigerant charging; approximately 1 minute and then repeat the procedure as needed.
19 Heat Controller, Inc. VMH SerieS Service Manual 18 2. Refrigerant charging Procedure: 1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder. Beca...
Page 20 - Electronic control function; Outdoor unit point check function; There is a check switch in outdoor PCB.
20 Service Manual VMH SerieS Heat Controller, Inc. 8. Electronic control function 8.1 Abbreviations T1: Indoor ambient temperature T2: Coil temperature of indoor heat exchanger middle. T2B: Coil temperature of indoor heat exchanger outlet. T3: Coil temperature of outdoor heat exchanger T4: Outdoor a...
Page 21 - Heating mode
21 Heat Controller, Inc. VMH SerieS Service Manual discharge temp. is 105 degree. If the indoor unit is not connected, the digital display tube will show: “- - “. 12 Inverter current AD data 13 EXV open angle for 1# indoor unit Actual data, divide this number by 8 for actual angle valve is open. 14 ...
Page 22 - Display
22 Service Manual VMH SerieS Heat Controller, Inc. 8.4.4Number of indoor units – displays how many indoor units the outdoor unit is communicating with. Display Quantity of indoor unit 1 1 2 2 3 3 4 4 8.4.5 Opening degree of electronic expansion valve: Actual opening degree value equals the display d...
Page 23 - limited per the table below.
23 Heat Controller, Inc. VMH SerieS Service Manual 8.5.4 Compressor current limit protection If the compressor current exceeds the current limit value for 10 seconds, the compressor frequency will be limited per the table below. Cooling mode: Current frequency(Hz) Current limit value(A) Frequency li...
Page 24 - and display the failure code.; °C) and newly powered on or if T4
24 Service Manual VMH SerieS Heat Controller, Inc. 8.5.5 Indoor / outdoor units communication protection If any indoor unit can not receive the feedback signal from the outdoor unit for 2 minutes, the AC will stop and display the failure code. 8.5.6 High condenser coil temp. protection. When T3>1...
Page 25 - Operation
25 Heat Controller, Inc. VMH SerieS Service Manual 9. Troubleshooting 9.1 Indoor Mini-Split error code explanations: Indoor Error Code LED STATUS Corresponding Outdoor Error code E0 Indoor EEPROM malfunction —— E1 Indoor/ outdoor unit communication error —— E2 Zero-crossing signal error —— E3 Indoor...
Page 26 - Outdoor
26 Service Manual VMH SerieS Heat Controller, Inc. 9.2 Outdoor unit error code explanation: Outdoor Error Code: LED STATUS Corresponding Indoor Mini-Split error code E0 Outdoor EEPROM malfunction E5 E1 Indoor unit A’s coil outlet temp. sensor or connector of sensor is defective E5 E2 Indoor unit B’s...
Page 27 - Trouble shooting; Insert the EEPROM well; (EERROM chip may be solid for some models)
27 Heat Controller, Inc. VMH SerieS Service Manual 9.3 Trouble shooting 9.3.1 Indoor unit trouble shooting 9.3.1.1 Indoor EEPROM malfunction If the EEPROM chip is welded on PCB, replace the PCB directly. Otherwise, check whether the EEPROM chip plugged in PCB well? Yes No Yes Insert the EEPROM well ...
Page 28 - SEE A
28 Service Manual VMH SerieS Heat Controller, Inc. 9.3.1.2 Indoor / outdoor units communication error No No, fist time Yes Yes No Reconnect the wiring Check wiring on the outdoor and indoor terminal follow the wiring diagram. Are all wires connected correctly? Turn on all indoor units with the remot...
Page 30 - Color
30 Service Manual VMH SerieS Heat Controller, Inc. 9.3.1.3 Zero-crossing signal error Check if the connections and power supply is normal? Correct the connections. Turn on the unit when the power supply is good. No Yes Indoor PCB is defective. Replace indoor PCB. 9.3.1.4 Indoor fan speed has been ou...
Page 31 - Correct the connections
31 Heat Controller, Inc. VMH SerieS Service Manual 9.3.1.5 Indoor fan speed has been out of control(AC fan motor) Shut off the power supply and turn it on 5 seconds later.Is it still displaying the error code? S h u t o f f t h e p o w e r s u p p l y , rotate the cross fan by hand. Does it rotate p...
Page 32 - Replace the water pump
32 Service Manual VMH SerieS Heat Controller, Inc. 9.3.1.6 Open or short circuit of temperature sensor. Check the connections between temperature sensor and PCB. Are the connections good? Correct the connections. No Yes Yes Replace indoor or outdoor PCB. R e p l a c e t h e s e n s o r a n d c h e c...
Page 33 - Outdoor EEPROM malfunction
33 Heat Controller, Inc. VMH SerieS Service Manual 9.3.1.6 Open or short circuit of temperature sensor. Check the connections between temperature sensor and PCB. Are the connections good? Correct the connections. No Yes Yes Replace indoor or outdoor PCB. R e p l a c e t h e s e n s o r a n d c h e c...
Page 35 - Check the signal wire between
35 Heat Controller, Inc. VMH SerieS Service Manual 9.3.2.3 Communication malfunction between IPM board and outdoor main board(ODU E7) Communication malfunction between IPM board and outdoor main board Is there at least one LED in the IPM board light? Check the signal wire between the IPM module and ...
Page 36 - Appendix 2
36 Service Manual VMH SerieS Heat Controller, Inc. 9.3.2.4 Temperature protection of compressor discharge (ODU P0) Temperature protection of compressor discharge Check whether the compressor discharge temp. is more than 239°F (115°C)? Check whether there is a refrigerant leak Yes No Check whether th...
Page 43 - Refer to this section.
43 Heat Controller, Inc. VMH SerieS Service Manual 9.3.2.11 High PFC module protection (ODU P6) (Only for A-VMH36QC-1) 9.3.2.12 Inverter compressor drive protection (ODU P7) The trouble shooting is same process as the IPM module protection, trouble shooting. Refer to this section. PFC module protect...
Page 44 - Appendix; K Ohm
44 Service Manual VMH SerieS Heat Controller, Inc. Appendix 1 Temperature Sensor Resistance Value Table ( ℃ --K) Use appendix 4 to convert °C to °F. ℃ K Ohm ℃ K Ohm ℃ K Ohm ℃ K Ohm -20 115.266 20 12.6431 60 2.35774 100 0.62973 -19 108.146 21 12.0561 61 2.27249 101 0.61148 -18 101.517 22 11.5000 62 2...
Page 48 - Position
48 Service Manual VMH SerieS Heat Controller, Inc. Appendix 5: Spec. Outdoor unit Model 1x2 1x3 1x4 Compressor DA130S1C-20FZ DA150S1C-20FZ TNB306FPGMC-L Outdoor fan motor YDK70-6FB YDK70-6FB YDK180-8GB Indoor unit Model 9k Mini-Split 12k Mini-Split 18k Mini-Split Indoor fan motor RPG20B RPG20B RPG28...
Page 49 - Measure the resistance value of each winding by using the tester.
49 Heat Controller, Inc. VMH SerieS Service Manual 2. Fan Motor. Measure the resistance value of each winding by using the tester. Position Resistance Value YDK70-6FB YDK180-8GB YSK27-4G YSK68-4B YDK45-6B YSK25-6L Black - Red 56 Ω±8% (20 ℃ ) 24.5 Ω±8% (20 ℃ ) 317 Ω±8% (20 ℃ ) 145 Ω±8% (20 ℃ ) 345 Ω±...
