Haier H2SM-(9+12)HEK03/R2 Service Manual page 17

before the outdoor fan operates.
When changed from cooling to heating, the compressor stands by for 3 minutes, the outdoor fan
stops.
return difference of 2°C for the change between high and medium speed.
return difference of 2°C for the change between low and medium speed.
Once the fan operates in a mode, it must operate for more than 45 seconds.
There is a high temperature protection and a temperature cut-off protection.
outdoor fan stops; when the coil temperature falls to T_OFR (52°C), the outdoor fan restarts. The outdoor
fan stops for more than 45 seconds.
and maintains for 10 seconds, both the compressor and outdoor fan stop, and the indoor fan operates as
the thermostat is Off. The compressor will not restart in 3 minutes until the coil temperature lower than T_
CP R(50°C).
5.2.4 Double-unit heating operation
When the double-unit's indoor unit gives out a heating signal, outdoor compressor A starts heating
operation. During the operation, outdoor compressor A and the 4-way valve operate 1 second before the
fan starts, 20 seconds later, outdoor compressor B starts heating operation.
Once an outdoor compressor starts, the other compressor will not start in 20 seconds from the
start.
When changed from cooling to heating, 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.
a return difference for the change between high and medium speed;
return difference for the change between low and medium speed.
Once a fan operates in a mode, it must operate for more than 45 seconds.
5.2.5 Cooling and heating operations take place at the same time
When one of the indoor units gives out a cooling signal and another unit gives out a heating signal
at the same time, the outdoor fan operates at the low speed.
When the indoor unit gives the value of coil temperature, the outdoor fan runs at the low speed if
the heating outdoor unit judges high load.
Once a compressor starts, the other compressor will not start in 20 seconds from the start.
5.2.6 Single-unit heating operation with heat load
In the single-unit heating operation, the indoor unit gives out the value of the coil temperature, and
the outdoor unit judges whether to start in the high load protection operation based on the value of the
coil temperature it has received. If the conditions for high load protection are met, the outdoor fan stops
H2SM-(9+12)HEK03/R2
: When the indoor coil temperature higher than T_OFS (56°C), the
: When the indoor coil temperature higher than T_CPS (68°C)
15
Funcitions and Control
Domestic Air Conditioner