Functions And Control - Haier HSU-36LPA03R2T3 Service Manual

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Functions and control

7.1 Main functions and control specifications
Including brief introduction to air conditioners of series models and electric control function.
7.1.1 A utomatic running
7.1.1.1 Automatic running 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
a. Tr 23
b. 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.
7.1.2 Indoor temperature control
Temperature control range: 16 -30
Temperature control precision: 1
Compressor can't be controlled by temperature sensor within 2 minutes after it starts
7.1.2.1 Cooling mode:
When Tr> Ts, outdoor fan motor and compressor on, and indoor fan motor run at fixed wind speed. When Tr
Ts, outdoor fan motor and compressor off, and when Tr > Ts, outdoor fan motor and compressor are working
again .If Tr=Ts, the indoor fan motor, outdoor fan motor and the compressor's state will not change.
7.1.2.2 Heating mode:
When Tr Ts, compressor, four-ways valve and outdoor fan motor is on, indoor fan motor runs as in cold
blast avoidance mode, and 4 of compensation is added after compressor is started.
When Tr>Ts+5 , compressor is off, and the indoor fan motor runs as in cold blast avoidance mode.
When Tr<Ts+5 , compressor, four-ways valve and outdoor fan motor is on, and the indoor fan motor runs
as in the mode of avoiding cold blast.
7.1.3 Cooling run mode:
Temperature control range: 16 -30
Temperature control precision: 1
Compressor can't be controlled by temperature sensor within 2 minutes after it starts.
Control character: when Tr Ts, outlet air from compressor is on and indoor fan motor run at fixed wind speed.
When Tr Ts, outlet air from compressor is off, and when Tr>Ts, outlet air from compressor is on.
Wind speed control: (the temperature difference is 1 )
Auto: when Tr>=Ts+3 , the wind speed is high;
when Ts+1 Tr Ts+3 , the wind speed is medium.
when Tr Ts+1 , the wind speed is low.
When temperature sensor is off, the fan motor runs at low speed.
When the wind speed changes from low to high, there is no delay, and when it changes from high to low,
there is a 3-minutes delay before conversion.
running cooling mode
running heating mode
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Functions and control