Intermittent Operation Control For Indoor Fans Of The Indoor Unit At Thermo-Off Side In Heating Operation - Toshiba RAS-M10SMUV-E Service Manual

9-3. 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 two 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.
A room
Thermo-ON continues
0 rpm
B room thermo-ON
↓
Thermo-OFF
↓
Thermo-ON
0 rpm
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Indoor fan: Operates with setup number of revolution
B room thermo-OFF
UL
(∗1) (∗1)
Fan stop
T on T on
T off
∗ 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).
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UL UL
(∗1)
Fan stop Fan stop
T on
T off T off
B room thermo-ON
Operated with setup number
of revolution
∗1 Operated with UL or SUL
T on=2 min.
T off time
To < 5˚C 2 min.
5 < To < 10
3 min.
10 < To
4 min.
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