Haier AS12TA2HRA-TH2 Service Manual

Functions and control14 Domestic air conditioner7.Funcitions and control7.1 Main functions and control specification7.1.1 Automatic operationWhen the running mode is turned to automation after starting the system, the system will firstdetermine the running mode according to the current room temperature and then will run according tothe determined mode. Tr in the following selection conditions means room temperature, Ts meanssetting temperature, Tp means temperature of indoor coil pipeTr 23 Choose Cooling ModeTr 23 Choose Heating ModeAfter turning to the automation mode, the running mode can be switched between cooling mode,fan mode and heating mode according to the change of the indoor ambient temperature. But theautomatic conversion between cooling mode and heating mode must be conducted after 15 minutes.7.1.2 Cooling operation modeTemperature control range: 16 ---30Temperature difference: 1* Control features: When Tr input airflow >Ts set temperature , the compressor will be opened,the indoor fan will operate at the set speed and the mode signal will be sent to the outdoor system.When Tr input airflow Ts set temperature , the compressor will be opened, the indoor fan willoperate at the set speed and the mode signal will be sent to the outdoor system. The system will keepthe original status if Tr= Ts.Airflow speed control: (temperature difference 1 )Automatic: When Tr Ts+3 , high speed.When Ts+1 Tr , medium speedWhen Tr , low speedWhen the sensor is off, low speedWhen the airflow speed has no delay from the high to low switching, the speed should be delayed for3 minutes (remain at high speed for 3 minutes.) before the next switch.Manus: When the system is operating, you can set the high, medium or low speed manually. (Whenthe sensor is on or off, the system will change the speed 2 seconds after receiving the signal.)*Airgate location control: the location for the airgate can be set according to your needs.*Defrosting function: preventing the frosting on the indoor heat exchanger (when cooling ordehumidifying). When the compressor works continuously for 1/6 minutes (adaptable in EEPROM)and the temperature of the indoor coils has been below zero centigrade for 10 seconds, thecompressor will be stopped and the malfunction will be recorded in the malfunction list. The indoorsystem will continue to run. When the temperature of the indoor coil is raised to 7 , the compressorwill be restarted again (the requirement of 3 minutes delay should be satisfied.)* timing system on/off function.* Dormant control function.