9-4. 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 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 2 rooms, if room temperature reached the setup temperature in both
rooms and thermo-off occurred, both indoor units start intermittent operation of the indoor fan.
T on=2 min.
A room
Thermo-ON continues
0 rpm
0 rpm
B room thermo-ON
↓
Thermo-OFF
↓
Thermo-ON
Indoor fan: Operates with setup number of revolution
B room thermo-OFF B room thermo-ON
Operated with setup number
of revolution
∗1 Operated with UL or SUL
Fan stop
T off T off T off
T on T on T on
UL
(∗1)
UL
(∗1)
UL
(∗1)
Fan stop Fan stop
∗ 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).
2 min.
3 min.
4 min.
To < 5°C
5
<
To < 10
10
<
To
T off time
To Next Page
Loading...
