Haier HSU12VHG-B Service Manual page 29

5.2.5.4 The protection function of AC current:
During the starting process of the compressor, if the AC current is greater than 15A, the frequency of
the compressor decreases at the speed of 1HZ/second.
During the starting process of the compressor, if the AC current is greater than 13A, the frequency of
the compressor decreases at the speed of 0.1HZ/second.
During the starting process of the compressor, if the AC current is greater than 11A, the frequency of
the compressor increases at the prohibited speed.
During the starting process of the compressor, if the AC current is greater than 10A, the frequency of
the compressor increases at the speed of no faster than 0.1HZ/second.
Remarks: when the outdoor temperature is high, there's compensation for AC current protection.
When the outdoor environment temperature is higher than 40 , AC current protection value
decreases by 10AD
When the outdoor environment temperature is higher than 46
decreases by 15AD
When the outdoor environment temperature is higher than 50
decreases by 20AD
5.2.5.5 Antifreezing protection of the indoor heat exchanger
When refrigerating/heating, prevent freezing.
Tpg_indoor
running state).
ice_temp_3+3 9
ice_temp_3 6
ice_temp_2 5
ice_temp_1 3
0
When Tpg_indoor
1HZ/1second.
When Tpg_indoor
1HZ/10seconds.
When Tpg_indoor begins to rise again, and ice_temp_2 Tpg_indoor
of thecompressor doesn't change.
When ice_temp_3 Tpg_indoor ice_temp_3+3 , the frequency of the compressor increases at the
speed of 1HZ/10seconds.
For example, Tpg_indoor 0
underload malfunction, but don't send malfunction report to the indoor.
The compressor stops for more than 3 minutes, Tpg_indoor> ice_temp_3+2 , the compressor
recovers.
HSU129HG(DB)-SM
is the minimum value of the effective indoor unit (start it and it is in accord with the
ice_temp_1 , the frequency of the compressor decreases at the speed of
ice_temp_2 , the frequency of the compressor decreases at the speed of
last for 2 minutes, and then the outdoor unit will stop, and report
11 //ice_temp_3+5
Increasing slowly
8 //ice_temp_3+2
Keeping the frequency
6
Decreasing slowly
Decreasing rapidly ice_temp_1
Stop
26
Wiring Diagrams
,AC current protection value
,AC current protection value
ice_temp_3 , the frequency
Domestic Air Conditioner