Main Functions And Control Specification Of Indoor Unit; Cooling Operation Mode; Dehumidification Mode; Funcitions And Control - Haier HSU-18HEA03/R2(DB)-I Service Manual

5. Funcitions and Control

5.1.1 automatic run mode
When the running mode is turned to automation after starting the system, the system will first
determine the running mode according to the current room temperature and then will run according to
the determined mode. Tr in the following selection conditions means room temperature, Ts means
setting temperature, Tp means temperature of indoor coil pipe
Tr 23
Tr 23
After 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 the automatic conversion between cooling mode and
heating mode must be conducted after 15 minutes.

5.1.2 Cooling operation mode

Temperature control range: 16°C---30°C
Temperature difference: ±1°C
* Control features: When Tr(input airflow)>Ts(set temperature)°C, 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 < Ts(set temperature)°C, 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. The system will keep the original
status if Tr= Ts.
Automatic: When Tr>=Ts+3°C, high speed.
When Ts+1°C=<Tr<Ts+3°C, medium speed
When Tr<Ts+1°C, low speed
When the sensor is off, low speed
When the speed has no delay from the high to low switching, the speed should be delayed for 3
minutes (remain at high speed for 3 minutes.) before the next switch.
* temperature control range: 16---30°C
* temperature difference: ±1°C
Control feature: send the dehumidify signal to the outdoor system.
When Tr>Ts+2°C , the compressor will be turned on, the indoor fan will operate at the set speed.
When Tr is between the Ts and Ts+2°C , the outdoor system will operate at the high dehumidify frequency
HSU-18HEA03/R2(DB)-I
Choose Cooling Mode
Choose Heating Mode
fference 1°C)
12
Funcitions and Control
Domestic Air Conditioner