Haier 1U50S2SJ2FA - Anti-Freezing Protection of the Indoor Heat Exchanger; The Frequency Limitation of Modification Rate

Functions and control
20 Domestic air conditioner
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 40ć, AC current protection value
decreases by 2.5A/1A(18K/24K).
(2) When the outdoor environment temperature is higher than 50ć, 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).
11ć//ice_temp_3+5
ice_temp_3+3 9ć
Increasing slowly
8ć//ice_temp_3+2
Keeping the frequency
ice_temp_3 7ć 7ć
ice_temp_2 5ć Decreasing slowly
ice_temp_1 3ć Decreasing rapidly ice_temp_1
1ć Stop
When Tpg_indoorLJ ice_temp_1, the frequency of the compressor decreases at the speed of
1HZ/1second.
When Tpg_indoorLJ 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_2İTpg_indoorİ ice_temp_3, the frequency
of the compressor doesn’t change.
When ice_temp_3LJTpg_indoorLJice_temp_3+3ć, the frequency of the compressor increases at the
speed of 1HZ/10seconds.
For example, Tpg_indoorİ0ćˈlast 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> ice_temp_3+2ć, 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