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Domestic air conditioner
HSU-09/12RS03/R2(SDB)
Function and control
5.2.6.4 Outdoor Temperature Limit
Cooling: When outdoor temperature is lower than 23 , cooling operation will start, compressor ć
frequency is limited to less than 50 HZ, outdoor wind speed is forced at level 1.
Heating: When outdoor temperature is higher than 18 , heating operation will start, compressor ć
frequency is limited to less than 50 HZ, outdoor wind speed is forced at level 1.
5.2.6.5 Special Features
1. Forced Cooling: When receiving indoor forced cooling signal, cooling operation will start in a
frequency signaled by indoor unit. Only air discharge temperature and over current protection features
are effective and other protection features are invalid.
2. Rated, Middle and Minimum Capacity Operation: When receiving indoor, rated, middle and
minimum capacity operation signal, outdoor unit will operate as per wind speed and frequency set by
EEPROM and all the protection features are effective.
5.2.6.6 Fault Display and Treatment
In case outdoor unit faults, the alarm indicator lamp will blink and blink frequency is 1HZˈTime interval
between blink cycles is 3s.
Alarm indicator lamp is off when there is no fault.
5.3 Function of Main Thermistor
Note: A:Outdoor suction temperature sensor
B: Exhaust temperature sensor
C: Indoor heat-exchange sensor
Outdoor Suction Temperature Sensor
The outdoor 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.
Exhaust Temperature Sensor
The discharge pipe thermistor is used for controlling temperature of the discharge pipe.
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