Haier HSU12VHG-B, Service Manual, Page: 29 / 98

HSU12 HG(DB)-SM Wiring Diagrams
26
Domestic Air Conditioner
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.
Ł
When the outdoor environment temperature is higher than 40
ć
, AC current protection value
decreases by 10AD
ł
When the outdoor environment temperature is higher than 46
ć
,AC current protection value
decreases by 15AD
Ń
When the outdoor environment temperature is higher than 50
ć
,AC current protection value
decreases by 20AD
5.2.5.5 Antifreezing protection of the indoor heat exchanger
When refrigerating/heating, prevent freezing.
Tpg_indoor
Ў
is the minimum value of the effective indoor unit (start it and it is in accord with the
running state).
11
ć
//ice5
ice3 9
ć
Increasing slowly
8 ć //ice2
Keeping the frequency
ice_temp_3 6 ć 6 ć
ice_temp_2 5 ć Decreasing slowly
ice_temp_1 3 ć Decreasing rapidly ice_temp_1
0 ć Stop
When Tpg_indoor LJ ice_temp_1 ć , the frequency of the compressor decreases at the speed of
1HZ/1second.
When Tpg_indoor LJ ice_temp_2 ć , the frequency of the compressor decreases at the speed of
1HZ/10seconds.
When Tpg_indoor begins to rise again, and ice_temp_2 İ Tpg_indoor İ ice_temp_3 ć , the frequency
of thecompressor doesn’t change.
When ice_temp_3 LJ Tpg_indoor LJ ice3 ć , the frequency of the compressor increases at the
speed of 1HZ/10seconds.
For example, Tpg_indoor İ 0 ćˈ last for 2 minutes, and then the outdoor unit will stop, and report
underload malfunction, but don’t send malfunction report to the indoor.
The compressor stops for more than 3 minutes, Tpg_indoor> ice2 ć , the compressor
recovers.