Haier 1U50JECFRA-3 Service Manual page 22

During the starting process of the compressor, if the AC current is greater than 13.5/14A(18K/24K),
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 13A/13A(18K/24K),
the frequency of the compressor increases at the prohibited speed.
During the starting process of the compressor, if the AC current is greater than 11.5A/12A(18K/24K),
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.
(1) When the outdoor environment temperature is higher than 40 , AC current protection value
decreases by 2.5A/1A(18K/24K).
(2) When the outdoor environment temperature is higher than 50 , AC current protection value
decreases by 3.5A/2A(18K/24K).
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
1HZ/1second.
When Tpg_indoor
1HZ/10seconds.
When Tpg_indoor begins to rise again, and ice_temp_2 Tpg_indoor
of the compressor 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
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
Increasing slowly
Keeping the frequency
Decreasing slowly
Decreasing rapidly ice_temp_1
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
last for 2 minutes, and then the outdoor unit will stop, and report
11 //ice_temp_3+5
8 //ice_temp_3+2
7
20
Functions and control
ice_temp_3, the frequency
, the compressor
Domestic air conditioner