Electrical Control Function
232 Electrical Control
1. Electrical Control Function
1.1 Abbreviation
T1: Indoor room temperature
T2: Evaporator coil temperature
T3: Condenser coil temperature
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
Ts: Setting temperature
1.2 Main Protection
1.2.1 Compressor Restart Delay
1.2.2 Sensor protection at open circuit and
breaking disconnection.
1.2.3 Phase check function(for 3-phase models)
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(for 48-60K
models)
The low pressure switch should be always closed. If
it is open, the system will stop until the fault is
cleared. Within 5 minutes after the compressor
starts and 4 minutes after defrosting ends, low
pressure switch won’t be checked.
Note: If this protection occurs 3 times within 20
minutes, it won’t recover automatically until the
main power is cut off.
1.2.5 Over-current protection(for 48-60K
models)
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.
1.3 Operation Modes and Functions
1.3.1 Fan mode
Outdoor fan and compressor cease
operation.
Temperature setting function is disabled, and
no preset temperature is displayed.
Indoor fan can be set to high, (
medium
), low,
or auto.
Louver operates the same as in cooling
mode.
Auto fan:
For floor standing units:
Auto fan will be controlled in line with cooling auto
fan with temperature set to be 24°C.
For other units:
High
Low
Medium
1.3.2 Cooling Mode
1.3.2.1 Compressor Running Guidelines
Once the compressor starts up, it will follow the
below rules:
When T1-Ts is higher than setting value, the
compressor and outdoor fan cease operation.
When T1-Ts is lower than setting value, the
compressor and outdoor fan activate..
T1-TS
On
Off
1.3.2.2 Outdoor Fan Running Guidelines
For single-fan units:
The outdoor fan will run following the compressor
For double-fan units:
The outdoor fans run depending on T3.
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