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7. Intermittent Operation Control for Indoor Fans of the Indoor Unit at Thermo-off Side in
Heating Operation
While heating operation is executed in two rooms, if room temperature reached the setup temperature in one
room and thermo-off occurred, the following operations start. (Refer to the figure below.)
1. The indoor unit of the room (A room) in which thermo-off did not occur starts a continuous operation with the
setup number of revolution.
2. The indoor unit of the room (B room) in which thermo-off occurred starts intermittent operation of the indoor fan.
The indoor fan operates with number of revolution of LL. Fan-ON time is 2 minutes and Fan-OFF time is 2 to 4
minutes.
While heating operation is executed in two rooms, if room temperature reached the setup temperature in both
room had thermo-off occurred, both indoor units start intermittent operation of the indoor fan.
LL LL LL
T off time
To < 5°C 2 min.
5 ≤ To < 10 3 min.
10 ≤ To 4 min.
Indoor fan: Operates with setup number of revolution
0 rpm
B room thermo-OFF
B room thermo-ON
A room
Thermo-ON continues
B room thermo-ON
Thermo-OFF
Thermo-ON
0 rpm
T on
T on
T on
Operated with setup number
of revolution
Fan stop
Fan stop
Fan stop
T off
T off
T off
T on=2 min.
Operated with UL or SUL
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