AUX-DC inverter ARV outdoor unit individual series technical manual
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4.2 Refrigerant system protection
High discharge
temperature protection.
1. System less refrigerant
2. ODU heat exchanger is dirty
3. There is air or N
2
in the piping system
4. Compressor suction pipe is blocked
5. Gas/liquid side stop valve is closed
6. Outdoor unit PCB failure
High pressure protection.
1. Exhaust pipe or condenser pipe is blocked
2. Condenser is dirty
3. Outdoor unitfan is stopped orlow speed
4. Refrigerant overcharge
1. Indoor unit fan is failed
2. Evaporator is dirty.
3. Lack refrigerant
4. Suction pipe is blocked.
High Compression ratio
protection
1. The discharge pipe of outdoor unit is blocked.
2. The suction pressure is too low, refer to F6.
Low compression
ratioprotection
1. The 4-way valve is failed because of block or high temperature.
2. Refrigerant return to the compressor is mixed with liquid and gas
because of poor evaporation.
No difference between high
and low pressure
The 4-way valve is failed because of block or high temperature.
1. There is refrigerant leakage.
2. Additional refrigerant charging volume is not enough.
Indoor unit total capacity
exceeding
Capacity of indoor units is less than 50% or more than 130% of
outdoor unit capacity.
4.3 Electric control system failure and protection
1. Supply power phase-reversal
2. Supply power phase lack
3. Outdoor unit PCB failure
Communication error
between outdoor and
indoor unit.
1. Short or Open circuit?
2. IDU address code is repeated?
3. Indoor power supply is abnormal?
4. Hand in hand connection?
5. Too closed to the strong power?
6. The wire is too long?
7. Outdoor / indoor PCB failure?
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