Haier AS25THMHRA-C Service Manual page 491

(1) When the outdoor environment temperature is higher than 40℃, AC current protection value
decreases by 1A.
(2) When the outdoor environment temperature is higher than 50℃, AC current protection value
decreases by 2A.
7.1.5.5 Anti-freezing protection of the indoor heat exchanger
When refrigerating/heating, prevent freezing.
Tpg_indoor is the minimum value of the effective indoor unit (start it and it is in accord with the running
state).
ice_temp_3+3 9℃
ice_temp_3 7℃
ice_temp_2 5℃
ice_temp_1 3℃
1℃
When Tpg_indoor〈 ice_temp_1, the frequency of the compressor decreases at the speed of
1HZ/1second.
When Tpg_indoor〈 ice_temp_2, the frequency of the compressor decreases at the speed of
1HZ/10seconds.
When Tpg_indoor begins to rise again, and ice_temp_2≤Tpg_indoor≤ ice_temp_3, the frequency
of the compressor doesn't change.
When ice_temp_3
speed of 1HZ/10seconds.
For example, Tpg_indoor
●
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.
7.1.5.6 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 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.
7.1.5.7 Temperature protection of the outdoor refrigerating coil
When the frequency are higher than 40Hz,and the defrosting sensor's temperature are higher than
68℃, the frequency of the compressor decreases 1hz/10seconds. Keep the frequency until it
〈Tpg_indoor〈ice_temp_3+3℃, the frequency of the compressor increases at the
●
●
≤0℃，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
7℃
Decreasing slowly
Decreasing rapidly ice_temp_1
Stop
19
Functions and control
●
Domestic air conditioner