Outdoor PCB Function Manual
1. Single-unit cooling operation
1.1When the single unit’s indoor unit gives a cooling signal, the corresponding outdoor
compressor carries out cooling operation. During the operation, the outdoor fan operates 1
second before the compressor operates.
1.2When changed from heating to cooling, the compressor stands by for 3 minutes, the
outdoor fan operates to blow off remaining heat and stops 30 seconds later.
1.3When the outdoor ambient temperature T1ı38ć, the outdoor fan runs at the high
speed. There is a return difference of 2ć for the change between high and medium
speed.
When the outdoor ambient temperature T1İ26ć, the outdoor fan runs at the low
speed. There is a return difference of 2ć for the change between low and medium
speed.
When the outdoor ambient temperature T1İ8ć, the outdoor fan is in a cycle of 1
minute stop and 3 minute run. There is a return difference of 2ć for the change
between low speed and run and stop.
1.4Once the fan operates in a mode, it must operate for more than 45 seconds.
There is a temperature cut-off protection: when the indoor coil temperature higher than
T_CPS (68ć) and maintains for 10 seconds, both the compressor and outdoor fan stop.
The compressor will not restart in 3 minutes until the coil temperature lower than T_CP
R(50ć). The indoor fan is controlled the same as the thermostat is OFF.
2. Double-unit cooling operation
2.1When the indoor unit gives out a double unit cooling signal, outdoor compressor A starts
cooling operation. During the operation, the outdoor fan runs 1 second before compressor
A operates, 20 seconds later, outdoor compressor B starts cooling operation.
2.2Once a compressor starts, the other compressor will not start in 20 seconds from the
start.
2.3 When changed from heating to cooling, the compressor stands by for 3 minutes. When
both compressors are in the strand-by status, the outdoor fan stops. Otherwise, it operates.
The status of the fan depends on the number of the compressors that operate.
Domestic Air Conditioner
Model: H2SM-14HC03/R2
H2SM-18HC03/R2
29
20
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