Haier 1U24SE3ERA Service Manual page 21

Remarks: the outdoor unit
7.1.5.3 The control of preventing the overcurrent of the compressor
During the starting process of the compressor, if the current of the compressor is greater than 15A for 3
seconds, stop the compressor and alarm, after 3 minutes, start it again, if such state appears 3 times in 20
minutes, stop the compressor and alarm, and confirm the malfunction. Then continue to run it only after the
the power is off.
During the starting process of the compressor, if the AC current is greater than 12A, 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 11A, 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 than10A, the frequency of the
compressor increases at the prohibited speed.
During the starting process of the compressor, if the AC current is greater than 9A, the frequency of the
compressor increases at the speed of no faster than 0.1HZ/second.
7.1.5.4 The protection function of AC current:
During the starting process of the compressor, if the AC current is greater than 12A, 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 11A, 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 10A, the frequency of the
compressor increases at the prohibited speed.
During the starting process of the compressor, if the AC current is greater than 9A, 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 1.5A
When the outdoor environment temperature is higher than 50 ,AC current protection value decreases by
3.5A
7.1.5.5 Antifreezing 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).
9
ice_temp_4
ice_temp_3 7
ice_temp_2 5
ice_temp_1 3
0
When Tpg_indoor
1HZ/1second.
When Tpg_indoor
1HZ/10seconds.
Increasing slowly
Keeping the frequency
6
Decreasing slowly
Decreasing rapidly
Stop
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
21
11 //ice_temp_4+2
9 //ice_temp_3+2
ice_temp_1
Functions and control
Domestic air conditioner