Haier 1U24TR4ERA Service Manual page 19

7.1.2 The outdoor fan control (Exchange fan)
When the fan is changed among every airflow speed (including stop blowing), in order to avoid the
airflow speed from skipping frequently, it must be kept under each mode for over 30 seconds, and then
it can be changed to another mode (when refrigerating, the time is changed to 15 seconds).
7.1.2.1 The outdoor fan control when refrigerating or dehumidifying
After the compressor is started for 5 seconds, the outdoor fan is started at the medium speed at
first, after 30 seconds, it begins to control the airflow speed according to the temperature conditions of
the outdoor environment.
The temperature of the
outdoor air（Ta）
Ta≥30℃
26℃≤Ta<30℃
24℃≤Ta<26℃
23℃≤Ta<24℃
10℃≤Ta<23℃
5℃≤Ta<10℃
Ta<5℃
7.1.2.2 The outdoor fan control when heating
The temperature of the outdoor air (Ta)
7.1.3 The control of the outdoor Electronic expansion valve (EEV)
(09K series have no this function)
In cooling mode, the EEV opening range is 90~480 steps. The EEV opening is 5 steps when unit is off.
In heating mode, the EEV opening range is 60~480 steps. The EEV opening is 45 steps when unit is
off.
After outdoor unit is off, the EEV opening keep the current on for 5 s, then open the EEV completely for
2 minutes, then become 5 steps (cooling) or 45 steps (heating).
The EEV opening will increase if SH (superheat degree) >0 while decrease if SH<0.
Adjust frequency:
If |SH|=0, 60s/ 1 step
If |SH|≥3,and △SH=0, 10s/ 1 step.
If 3≥|SH|≥0, 30s/ 1 step.
△SH= current SH- last SH
SH= Ts (suction temp)-Tc1 (indoor coil temp)-Tsh (fixed data, depend on different models, -1~2)
The temperature of the outdoor
Ta≥22℃
19℃≤Ta<22℃
16℃≤Ta<22℃
14℃≤Ta<16℃
Ta<14℃
coil（Te）
——
——
——
——
——
——
15℃≤Te
15℃>Te
Airflow speed
Keeping the speed
Keeping the speed
17
Functions and control
Airflow speed
High
Keeping the speed
Medium
Keeping the speed
Low
Keeping the speed
Low
Stop
Low
Medium
High
Domestic air conditioner