Outdoor Fan Motor Control - Toshiba RAS-B10EKVP-E Service Manual

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Item
3. Outdoor fan The blowing air volume at the outdoor unit side is con-
motor control trolled.
Receiving the operation command from the controller of
indoor unit, the controller of outdoor unit controls fan speed.
* For the fan motor, a DC motor with non-stage variable
speed system is used. However, it is limited to 8 stages
for reasons of controlling.
Air conditioner ON
(Remote controller)
Indoor unit controller
1) Outdoor unit
operation command
(Outdoor fan control)
2) Fan speed ≥ 400
when the motor stopped.
4) Motor operates as shown in the table below.
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Operation flow and applicable data, etc.
YES
fan motor continues.
NO
Fan motor ON
YES
Air conditioner
3) Fan lock
NO
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Outdoor fan speed (rpm)
OFF status of
Alarm
OFF display
– 30 –
Description
1) The operation command sent
from the remote controller is
processed by the indoor unit
controller and transferred to the
controller of the outdoor unit.
2) When strong wind blows at
outdoor side, the operation of air
conditioner continues with the
fan motor stopped.
3) Whether the fan is locked or not
is detected, and the operation of
air conditioner stops and an
alarm is displayed if the fan is
locked.
4) According to each operation
mode, by the conditions of
outdoor temperature(To) and
compressor revolution, the
speed of the outdoor fan shown
in the table is selected.