Electrical Control Function
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Electrical Control System
1. Electrical Control Function
1.1 Definition
T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
1.2 Main Protection
1.2.1 3 minutes Delay at restart for compressor.
1.2.2 Sensor protection at open circuit and breaking disconnection.
1.2.3 Phase check function
If the phase sequence is detected wrong or lack of 1 or 2 phase, the unit won’t start and there is error code
displayed on outdoor PCB.
1.2.4 Low pressure check function
The low pressure switch should be always closed. If it is open, the system will stop until the fault is cleared.
During defrosting procedure , 4 minutes after defrosting ends and 5 minutes after compressor is on in
heating mode, low pressure switch won’t be checked.
Note: The system will not check if the protection could be cleared in 30 seconds after the protection occurs.
If this protection occurs 3 times, it won’t recover automatically until the main power is cut off.
1.2.5 Over-current protection
When compressor is running, if the current is over twice of the rated for 3 seconds, the compressor will stop
and an error code will be displayed on the outdoor PCB. If the current becomes normal, the compressor will
restart after 3 minutes.
Note: The current won’t be checked within 3 seconds after the compressor starts. The system will not check
if the protection could be cleared in 30 seconds after the protection occurs.
1.3 Operation Modes and Functions
1.3.1 Fan mode
(
1) Outdoor fan and compressor stop.
(2) Temperature setting function is disabled, and no setting temperature is displayed.
(3) Indoor fan can be set to high/med/low/auto.
(4) The louver operates same as in cooling mode.
(5) Auto fan:
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