Electrical Control Function
Electrical Control 105
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 Time 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 and 4 minutes after defrosting ends, 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.
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