Haier H2SM-(9+12)HEK03/R2 Service Manual page 18

immediately. It will restart 45 seconds later if the signal for the outdoor heat load disappears. Otherwise,
the outdoor fan will continue to stop until the signal for the outdoor heat load disappears. The signal for
heat load is as follows:
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.
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).
In the single-unit heating operation, the current in the compressor is larger than 5.8A, and the
outdoor fan stops. 45 seconds later, the current in the compressor is less than 5.3A, and the outdoor fan
operates in normal condition(the compressor does not detect current within 30 seconds after its start), the
current in the compressor is larger than 5.3Aand less than 5.8A, and the outdoor fan does not restore.
5.2.7 Double-unit heating operation with heat load
In the double-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 temperature it has received. If the conditions for high load protection are met, the outdoor fan stops
immediately. It will restart 45 seconds later if the signal for the outdoor heat load disappears.
Otherwise, the outdoor fan will continue to stop until the signal for the outdoor heat load disappears.
The signal for heat load is as follows:
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.
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).
When the outdoor single-unit gives out the heat load signal, the outdoor fan stops immediately,
45 minutes later, the heat load signal disappears, and the outdoor fan operates.
In heating operation, any of the current in the compressor is larger than or equal to 5.8A , and
the outdoor fan stops. The current in the compressor is less than or equal to 5.3A, and the outdoor
fan restores (the compressor does not detect current within 30 seconds after its start), the current in
the compressor is larger than 5.3A and less than 5.8A, and the outdoor fan does not restore.
5.2.8 Current peak protection
The current in the compressor is larger than 10 After more than 5 seconds, The compressor which
has the highest current will stop(the compressor does not detect current within 10 seconds after its start)
and 3 minutes later it will continue to operate.
The compressor will no longer operate if overcurrent protection occurs 4 times in a row within 30
minutes, and the output transformer signal fails. In the double-unit operation, if one of the compressors
stops due to the current too high, the other system is a single system.
5.2.9 Single-unit defrosting operation
H2SM-(9+12)HEK03/R2
: When the indoor coil temperature higher than T_OFS (56°C), the
: When the coil temperature higher than T_CPS (68°C) and
When the indoor coil temperature higher than T_OFS (56°C), the
When the coil temperature higher than T_CPS (68°C) and
16
Funcitions and Control
Domestic Air Conditioner