CONTROLS SPECIFICATION
1
1
2
2
ABBREVIATION
Ts: Setting Temperature
Tr: Room Temperature
Ti: Indoor defrost sensor temperature
To: Outdoor defrost sensor temperature
OPERATION OF MAIN BOARD
COOL MODE
If Tr > Ts, cool operation is activated. Compressor and outdoor fan are turned on.
Indoor fan runs at the set speed.
If Tr Ts-1 cool operation is terminated. Compressor and outdoor fan are
turned off.
The range of Ts is 16-31
Indoor fan speed can be adjusted for low, medium, high and auto.Compressor will
be delayed for 3 minutes before it is turned on or off.
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C
Indoor de-ice
This process is checked by the indoor defrost sensor (Ti). If Ti =2 , indoor fan increase
to high speed, when Ti -1 for 1 minute continuously, compressor and outdoor fan are
turn off , indoor fan increases to high speed . When Ti 8 for 5 minutes continuously,
compressor and outdoor are turn on.
de-ice operation is on for more than 8 minutes, system will return to normal operation.
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C
AUTO CHANGEOVER MODE
Per Room
Temperature (RT)
Cooling only type
Mode
PRE-SET Temperature PRE-SET Temperature
Mode
24
26
RT-2
RT-2
Cool Cool
Dry RT-2
RT-2
Dry
Heat
Heat pump type
above 26
25-26
23-25
below 23
C
24
C C
C
C
C
C
FAN MODE
Indoor fan runs at the set speed while compressor and outdoor fan are turned off.
Indoor fan speed can be adjusted for low, medium and high.
When this mode is selected, the system will change from AUTO COOL to AUTO
DRY to AUTO HEAT mode according to the room temperature and will run
according to the programmed temperature set points as in the following table.
If the unit is restarted after it is stopped for less than 2 hours, it will resume at the
previously established mode before it was stopped. (i.e. AUTO COOL or AUTO
DRY or AUTO HEAT)
If the unit is restarted after it is stopped for more than 2 hours, it will run in a new
mode according to the room temperature when it is restarted.
During this mode the temperature set point can only be set + or - 2 Deg. C of the
room temperature.
C
44
C C
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