Haier HSM18HEKC03/R2 Service Manual page 29

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 1.5A
When the outdoor environment temperature is higher than 50 ,AC current protection value
decreases by 2.5A
5.2.6.5 Antifreezing protection of the indoor heat exchanger
When refrigerating/heating, prevent freezing.
Tpg_indoor
running state).
ice_temp_4 10
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 = ice_temp_3 , the frequency
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.
5.2.6.6 The frequency limitation of modification rate
In the field which is controlled by high frequency, if the modification rate is not high enough, the
control-driven on chip will enter into weak magnetic control, this will help to relieve the problem of
modification rate. If during the course of weak magnetic control, the modification rate is still not high
enough, enter into the control of decreasing frequency until the alarm of modification rate is relieved.
5.2.6.8 Temperature protection of the outdoor refrigerating coil
When the defrosting temperature and the sensor's temperature are higher than 65 , the frequency of
the compressor decreases 1hz/10seconds. Keep the frequency until it decreases to the lowest
frequency. When the temperatures are lower than 65
the compressor. When the temperatures are lower than 60 , relieve the defrosting temperature
protection.
HSM18HEKC/HRAC03/R2(DB)HUM18HC03/R2(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 spe ed 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
12 //ice_temp_4+2
Increasing slowly
8 //ice_temp_3+2
Keeping the frequency
Decreasing slowly
Decreasing rapidly
Stop
and higher than 60 , keep the frequency of
27
Function and control
ice_temp_1
Domestic Air Conditioner