9-
5
. 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 belox.)
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 UL or SUL. Fan-ON time is 2 minutes and Fan-OFF
time is 2 to 4 minutes.
However if temperature of the indoor heat exchanger becomes over 55°C or more in B room, the indoor fan
stops the intermittent operation and starts continuous operation.
While heating operation is executed in two rooms, if room temperature reached the setup temperature in both
room nad thermo-off occurred, both indoor units start intermittent operation of the indoor fan.
Operated with setup number
of revolution
UL
UL
UL
(
∗
1)
(
∗
1)
(
∗
1)
Fan stop
Fan stop
Fan stop
T on
T on
T on
T off
T off
T off
T on=2 min.
∗
In case which Tc sensor temperature exceeds 55°C
in B room, the fan stops intermittent operation and
starts continuous operation with UL or SUL (
∗
1).
10
≤
To
2 min.
3 min.
4 min.
0 rpm
T off time
To < 5°C
5
≤
To < 10
A room
Thermo-ON continues
0 rpm
Indoor fan: Operates with setup number of revolution
B room thermo-ON
B room thermo-OFF
B room thermo-ON
Thermo-OFF
Thermo-ON
∗
1 Operated with UL or SUL
– 46 –
