Haier 1U12BS3ERA Service Manual page 23

Wall mounted type dc inverter super match
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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 , the compressor
recovers.
7.1.4.6 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.
7.1.4.7 Temperature protection of the outdoor cooling coil
When the defrosting temperature and the sensor's temperature are higher than 65 , the frequency of
the compressor decreases 1hz/10seconds. Keep the frequency until it decreases to the lowest
frequency. When the temperatures are lower than 65
the compressor. When the temperatures are lower than 60 , relieve the defrosting temperature
protection.
7.1.5 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
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)
last for 2 minutes, and then the outdoor unit will stop, and report
SH=0, 10s/ 1 step.
and higher than 60 , keep the frequency of
21
Functions and control
Domestic air conditioner

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