Heat Controller VMH18SC-1, VMH12SC-1, VMH24SC-1, VMH09SC-1 service manual Troubleshooting, Safety

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Heat Controller, Inc.	VMH Series	Service Manual

8.4.11.2After 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 ionizer will work only when the indoor fan motor is running. If the indoor fan motor is off, the ionizer also stops working, even though the Clean Air function is available.

8.4.11.4Switching the run mode will not stop the ionizer. When turning off the A/C, the ionizer is also turned

off.

9. Troubleshooting

Safety

Because of there are capacitors in PCB electrical power is stored in the capacitors, do not forget to discharge the capacitor.

Electrolytic Capacitors

(HIGH VOLTAGE! CAUTION!)

Bulb (25-40W)

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Contents Inverter Single Zone Ductless Mini Split Heat Pump Contents  Installation PrecautionSafety Precaution  For installation, always contact the dealer  Caution  Do not block the inlet or outlet of air flow  Keep level even when installing the product Operational  Use two or more people to lift and transport the product Do not drink the water drained from the product Anti-freeze protection in cooling FunctionOutdoor unit Compressor delay Indoor Unit DimensionOutdoor Unit Model Dimension mmIndoor Outdoor Refrigerant Cycle DiagramWiring Diagrams VMH09SC-1 A-VMH12SC-1 VMH18SC-1 Installation details Single Zone V Series Inverter System Pipe length and the elevationSystem Evacuation and Charging Pressure Test & EvacuationOperation characteristics Display function Electronic functionAbbreviation Main Protection Preheat termination Preheat modeFan only mode Operation Modes and FunctionsCooling Mode Compressor running rules Model Current Frequency decreases HoldsIndoor fan running rules Condenser high temperature T3 protectionOutdoor fan rules Heating Mode Compressor running rules Evaporator low temperature T2 protectionT1-Ts-ΔT +5.0 +4.5 +3.5 +3.0 +2.5 +2.0 +1.5 +1.0 +0.5 Outdoor fan running rules I1HEAT I2HEAT I3HEATVMH18SC-1 Indoor fan rulesUnit TEL0 TEL1 VMH09SC-1 VMH12SC-1Defrost mode： Defrost Actions For 9K and 12K unit For 18K and 24K unit Auto-mode High evaporator coil temp.T2 protectionForced operation function Dehumidify modeSleep function mode Timer functionAutomatic front panel function Ionizer Clean Air functionAuto-Restart function Safety TroubleshootingEeprom parameter error diagnosis and solution Indoor Unit Error DisplayDiagnosis and Solution VMH Series E3 Indoor or E7 Outdoor Igbt over current protection diagnosis and solution VMH Series Inverter compressor drive error diagnosis and solution 29 P3 Error Low Ambient ProtectionPosition Resistance Value Key parts checkingVMH Series Some frequently-used R-T data for T1, T2, T3 and T4 sensor 2012