2HUM18HC03/R2(DB)-SM Wiring diagrams
27
Domestic air conditioner
ŃWhen the outdoor environment temperature is higher than 50ć,AC current protection value
decreases by 20AD
5.2.5.5 Antifreezing protection of the indoor heat exchanger
When refrigerating/heating, prevent freezing.
Tpg_indoor Ў 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
9ć
ce_temp_3+3 Increasing slowly
8ć//ice_temp_3+2
Keeping the frequency
ice_temp_3 6ć 6ć
ice_temp_2 5ć Decreasing slowly
ice_temp_1 3ć Decreasing rapidly ice_temp_1
0ć Stop
When Tpg_indoorLJ ice_temp_1ć, the frequency of the compressor decreases at the speed of
1HZ/1second.
When Tpg_indoorLJ ice_temp_2ć, the frequency of the compressor decreases at the speed of
1HZ/10seconds.
When Tpg_indoor begins to rise again, and ice_temp_2LJ=Tpg_indoorLJ= ice_temp_3ć, the
frequency of thecompressor 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_indoor<= 0ćˈlast 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.
5.2.5.6 The frequency limitation of modification rate
In the field which is controlled by high frequency, if the modification rate is not high enough,
the 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.
5.2.5.7 Temperature protection of the outdoor refrigerating coil
When the defrosting temperature and the sensor’s temperature are higher than 65ć, the
frequency of the compressor decreases 1hz/10seconds. Keep the frequency until it decreases to
the lowest frequency. When the temperatures are lower than 65ć and higher than 60ć, keep
the frequency of the compressor. When the temperatures are lower than 60ć, relieve the
defrosting temperature protection.
5.2.5.8
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