Light Commercial R410A on-off DM17-01.01.08en
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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.
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