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5.2.2 The outdoor fan control (exchange fan)
When the fan is changed among every airflow speed (including stop blowing), in order to avoid the
airflow speed from skipping frequently, it must be kept under each mode for over 30 seconds, and
then it can be changed to another mode (when refrigerating, the time is changed to 15 seconds).
5.2.2.1
The outdoor fan control when refrigerating or dehumidifying
After the compressor is started for 5 seconds, the outdoor fan is started at the medium speed at first,
after 30 seconds,it begins to control the airflow speed according to the temperature conditions of the
outdoor environment.
The temperature of the
outdoor air
Ta
Ta≥30
26 ≤Ta<30
24 ≤Ta<26
23 ≤Ta<24
5 ≤Ta<23
Ta<5
5.2.2.2 The outdoor fan control when heating
The temperature of the outdoor
air
Ta
Ta≥22
19 ≤Ta<22
16 ≤Ta<22
14 ≤Ta<16
Ta<14
5.2.3 The control of the outdoor electronic expansion valve
When starting the compressor: the opening size of the valve must be guaranteed to have entered into
the standard opening size, and then the compressor can be started.
When refrigeration is in vain (the machine is shut down or is in the state of retrograde operation), the
opening size of the expansion valve of the indoor unit is 5 steps;
When heating is in vain, the opening size of the expansion valve of the indoor unit is 55 steps;
When the outdoor unit is shut down, the valve is opened completely for 2 minutes, and then begin
initialization.
The scope of refrigerationg valve
The scope of heating valve
The valves are adjusted according to the degree of superheat —SHa
HSU09VHG(DB)-SM
The temperature of the outdoor
coil Te
—
—
—
—
—
—
—
—
—
—
15 ≤Te
15 >Te
Airflow speed
Low
Keeping the speed
Medium
Keeping the speed
High
90-----480 steps
80-----480 steps
24
Functions and control
Airflow speed
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Low
Stop
SHa.
Domestic Air Conditioner
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