The fan motor for Fresh Air is operated in synchronization with the indoor fan operation
as shown in Figure 9.
The external electrical heater is operated as shown in Figure 10.
1-18. FRESH AIR CONTROL
1-19. EXTERNAL ELECTRICAL HEATER CONTROL
01-18
(Fig.9 : Fresh air control)
(Fig.10 : External electrical heater control)
Operation
Stop
Operation
Stop
Fan motor
(Indoor unit)
Fan motor
(for Fresh Air)
When the room
temperature rises
When the room
temperature drops
Ts : Setting temperature
Heater : OFF
Ts -10°C
Ts -1°C
Ts -3°C
Ts -12°C
When the compressor stop,
External electrical heater is OFF.
1-20. COMPRESSOR PREHEATING
When the outdoor heat exchanger temperature is lower than 0°C and the heating operation
has been stopped for 30 minutes, power is applied to the compressor and the compressor is heated.
(By heating the compressor, warm air is quickly discharged when operation is started.)
When operation was started, and when the outdoor temperature rises to 2°C or greater,
preheating is ended.
Heater : ON
Heater : OFF
Tn : Outdoor heat exchanger
temperature
OFF
Tn 2°C
Tn 0°C
ON
(Fig.11 : Compressor preheating control)
The forced cooling operation starts up when MANUAL / AUTO button is pressed more than 10 seconds.
During the forced cooling operation, it keeps operation regardless of detection value of room
temperature sensor.
Operation LED and timer LED blink during the forced cooling operation. They blink for 1 second ON
and 1 second OFF on both operation LED and timer LED (same as test operation).
Forced cooling operation is released after 60 minutes of starting operation.
1-17. FORCED COOLING OPERATION
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