Page 2 - Service Manual; VMH SerieS; CONTENTS
2 Service Manual VMH SerieS Heat Controller, Inc. CONTENTS 1.Safety Precautions ............................................................................................................................. 32. Functions ...................................................................................
Page 3 - Safety Precaution
3 Heat Controller, Inc. VMH SerieS Service Manual 2 1. Precaution 1.1 Safety Precaution To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring instruction will cause harm or damage. Before service unit...
Page 5 - CAUTION
5 Heat Controller, Inc. VMH SerieS Service Manual 4 Do not use the telephone or turn switches on or off. There is risk of explosion or fire. If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the power supply cable. There is risk of electric shock or fire. ...
Page 6 - Operational; Do not block the inlet or outlet of air flow.
6 Service Manual VMH SerieS Heat Controller, Inc. 5 Keep level even when installing the product. To avoid vibration of water leakage. Use two or more people to lift and transport the product. Avoid personal injury. Do not install the product where it will be exposed to sea wind (salt spray) di...
Page 7 - There are sharp and moving parts that could cause personal injury.; Do not drink the water drained from the product.; It is not sanitary could cause serious health issues.; mix old and mew batteries or different types of batteries.; There is risk of fire or explosion.; water. Do not use the remote of the batteries have leaked.
7 Heat Controller, Inc. VMH SerieS Service Manual 6 A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage. Do not insert hands or other object through air inlet or outlet while the product is operated. There are sharp and moving parts that could...
Page 8 - Ionizer
8 Service Manual VMH SerieS Heat Controller, Inc. 7 2. Function When the power supply is interrupted and then restored, the unit automatically restarts at the previous function setting. Maintains the room temperature according to the set temperature The mode can be change by the room temperature The...
Page 9 - Protects the valves and prevents water from dripping.
9 Heat Controller, Inc. VMH SerieS Service Manual 8 Protects the valves and prevents water from dripping. 3 minute time delay between ON/OFF operation. Outdoor unit Compressor delay Hydrophilic aluminum fin Energized in the heating mode except when in defrost. Anti-rust cabinet Valve protection cove...
Page 12 - INDOOR
12 Service Manual VMH SerieS Heat Controller, Inc. 11 4. Refrigerant Cycle Diagram: INDOOR OUTDOOR LIQUID SIDE GAS SIDE HEAT EXCHANGE (EVAPORATOR) HEAT EXCHANGE (CONDENSER) COMPRESSOR 2-WAY VALVE 3-WAY VALVE CHECK VALVE (Heating Model only) CAPILIARY TUBE REVERSING VALVE (Heating Model only) COOLING...
Page 16 - Single Zone “V” Series Inverter System:
16 Service Manual VMH SerieS Heat Controller, Inc. 15 6.2 Pipe length and the elevation: 1. Single Zone “V” Series Inverter System: Capacity Pipe Size Standard Max Total Additional Btu/h Gas Liquid Length Elevation Line Length (ft) Refrigerant (in) (in) (ft) (ft) Min. Max. oz/ft 9k 3/8 1/4 *16.5 26 ...
Page 17 - Pressure in the system rises.
17 Heat Controller, Inc. VMH SerieS Service Manual 16 6.3 Pressure Test & Evacuation Air and moisture in the refrigerant system have undesirable effects as below: ● Pressure in the system rises. ● Operating current rises. ● Cooling or heating efficiency drops. ● Moisture in the refrigerant circu...
Page 18 - Deep Vacuum Method; Operation characteristics
18 Service Manual VMH SerieS Heat Controller, Inc. 17 2. Deep Vacuum Method The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum of 500 microns and vacuum gage capable of accurately measuring the vacuum depth. The deep vacuum method is the most positi...
Page 19 - Electronic function; Display function; TIMER display; Illuminated during Timer operation.; TURBO operation display; Display’s; the current set temperature or fault error code when the air; “SC”; FAN SPEED display
19 Heat Controller, Inc. VMH SerieS Service Manual 18 8. Electronic function 8.1 Abbreviation T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperature T5: Compressor discharge temperature TS: Preset temperature. 8.2 Display func...
Page 20 - minute delay for 1; time start-up and 3 minute delay for others.
20 Service Manual VMH SerieS Heat Controller, Inc. 19 8.3 Main Protection 8.3.1 Three Minute Time Delay at restart for compressor. 1 minute delay for 1 st time start-up and 3 minute delay for others. 8.3.2 Temperature protection of compressor top. Protector cuts off compressor for 30 seconds and res...
Page 21 - heating the crankcase.; Preheat termination:; If T4; Operation Modes and Functions; °F °C
21 Heat Controller, Inc. VMH SerieS Service Manual 20 Preheat mode: • With the compressor off, a small amount of current flows through the windings of the compressor heating the crankcase. Preheat termination: • If T4 ＞ 41°F/5°C or user turns on the machine and compressor runs, preheating function w...
Page 22 - While
22 Service Manual VMH SerieS Heat Controller, Inc. 21 8.4.2 Cooling Mode 8.4.2.1 Compressor running rules: The operating frequency of compressor after starting submits to following rule. If users switch on A/C by remote controller, the compressor will run at the Fmax frequency for 7 minutes accordin...
Page 23 - G: Decreases the frequency to the lower level F1.
23 Heat Controller, Inc. VMH SerieS Service Manual 22 Note: When T1-Ts stays in the same temp. zone for 3 minutes, the compressor will run as follows: A~E: Increases the frequency to level F8. F: Maintains the current frequency. G: Decreases the frequency to the lower level F1. H: Runs at F1 for 1h....
Page 24 - The outdoor fan has two speeds, and is controlled by T4 as follows:
24 Service Manual VMH SerieS Heat Controller, Inc. 23 8.4.2.2 Outdoor fan rules: Outdoor fan and compressor start at the same time, outdoor fan stops 30s after the compressor stops. The outdoor fan has two speeds, and is controlled by T4 as follows: 8.4.2.3 Indoor fan running rules In cooling mode, ...
Page 25 - minute until stop the compressor stops.
25 Heat Controller, Inc. VMH SerieS Service Manual 24 8.4.2.5 Evaporator low temperature T2 protection. When T2<32°F/0°C, the compressor will stop and restart when T2>41°F/5°C. When 32°F/0°C≤T2<39°F/4°C , the compressor frequency is limited and decreases to the lower level every minute unti...
Page 26 - ambient temp. During the 7 minutes, frequency limitation is active.
26 Service Manual VMH SerieS Heat Controller, Inc. 25 After A/C starts up, the compressor will run at the Fmax frequency for 7 minutes according to outdoor ambient temp. During the 7 minutes, frequency limitation is active. 7 minutes later, compressor running frequency will be controlled as below: W...
Page 27 - over I3HEAT,, the compressor will stop and restart 3min later.
27 Heat Controller, Inc. VMH SerieS Service Manual 26 Meanwhile, the compressor running frequency is limited by the current. If the current increases more than I2HEAT, the frequency will decrease automatically, if the current raises to over I3HEAT,, the compressor will stop and restart 3min later. D...
Page 28 - °F °C
28 Service Manual VMH SerieS Heat Controller, Inc. 27 8.4.3.3 Indoor fan rules: The indoor fan speed can be selected as high, medium, low and auto, the anti-cold-wind function has the priority. If set temperature is reached, the indoor fan switches to lowest speed, the anti-cold wind function has pr...
Page 33 - Forced cooling mode:
33 Heat Controller, Inc. VMH SerieS Service Manual 32 8.4.6.2 In forced operation mode, all general protections and remote control functions are available. 8.4.6.3 Operation rules: Forced cooling mode: The compressor runs at F2 frequency and indoor fan runs as breeze. After running for 30 minutes. t...
Page 34 - turn to auto mode as 75°F/24°C set temp.
34 Service Manual VMH SerieS Heat Controller, Inc. 33 8.4.8.3 Timer setting is available 8.4.8.4 When user uses timer off function in sleep mode (or sleep function in timer off mode), if the timing is less than 7 hours, sleep function will be cancelled when the set time reached. If the timing is mor...
Page 35 - Safety
35 Heat Controller, Inc. VMH SerieS Service Manual 34 8.4.11.2 After the A/C is turned on, the Clean Air function is switched on when the A/C receives FRESH CODE the first time, and ionizer is switched off when the A/C receives the CODE again. 8.4.11.3 After starting the Clean Air function, the ioni...
Page 36 - Indoor Unit Error Display
36 Service Manual VMH SerieS Heat Controller, Inc. 35 9. Troubleshooting 9.1 Indoor Unit Error Display Display LED STATUS E0 EEPROM parameter error E1 Indoor / outdoor units communication protection E2 Zero-crossing signal error E3 Indoor fan speed out of control E5 Open or short circuit of outdoor ...
Page 39 - IGBT over current protection diagnosis and solution
39 Heat Controller, Inc. VMH SerieS Service Manual 38 9.2.5 Open or short circuit of temperature sensor diagnosis and solution 9.2.6 IGBT over current protection diagnosis and solution Yes Replace the outdoor or indoor PCB Yes Check the connections between the sensors and the PCB. Are the connection...
Page 41 - P3 ERROR – Low Ambient Protection
41 Heat Controller, Inc. VMH SerieS Service Manual 40 9.29 P3 ERROR – Low Ambient Protection If the outdoor temperature remains at 5°F(-15°C) for an hour, the compressor will turn off and the error code “P3” will be displayed on the indoor unit. Once the compressor has been off for at least an hour ...
