Haier HSU-09RS03/R2(SDB) Service Manual page 28

HSU-09/12RS03/R2(SDB)
Function and control
If the temperature of discharge pipe (used in place of the inner temperature of the
compressor) rises abnormally, the operating frequency drops or the operation halts.
Indoor heat-exchange sensor
1.The indoor heat exchanger thermistor is used for controlling target discharge temperature.
The system sets a target discharge temperature according to the outdoor and indoor heat
exchanger temperature, and controls the electronic expansion valve opening so that the
target discharge temperature can be obtained.
2.The indoor heat exchanger thermistor is used for preventing freezing.During the cooling operation, if
the temperature drops abnormally, the operating frequency becomes lower, then the operation halts.
3.The indoor heat exchanger thermistor is used for anti-icing control.During the cooling operation, if
the heat exchanger temperature in the room where operation is halted becomes -1°C, it is assumed
as icing.
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Domestic air conditioner