Service manual

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(3) Positioning
The vane presses to the vane stopper once to confirm the standard position and then moves to the set angle.
Confirming of standard position is performed in case of follows.
(a) When the power supply turns ON.
(b) When the operation starts or finishes (including timer operation).
(c) When the test run starts.
(d) When multi-standby starts or finishes
(4) VANE AUTO ( ) mode
In VANE AUTO mode, the microprocessor automatically determines the horizontal vane angle and operation to make
the optimum room-temperature distribution.
2-19. AUTO VANE OPERATION
1. Horizontal vane
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approximate 12V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode changes as follows by pressing VANE CONTROL button.
2-18. OUTDOOR FAN MOTOR CONTROL
Fan speed is switched according to the compressor frequency.
COOL
Fan speed
Up
Down
Up
Down
Mode
HEAT
Indoor unit operation
MUZ-GA50/60 MUZ-GA71/80
<Relation between compressor frequency and fan speed.>
54Hz
39Hz
54Hz
39Hz
44Hz
33Hz
52Hz
42Hz
Up
Down
Fan speed
High
Low
Compressor frequencyMin. Max.
(1) In COOL and DRY operation
(2) In HEAT operation
Vane angle is fixed to Angle 1.
Vane angle is fixed to Angle 4.
(5) STOP (operation OFF) and ON-TIMER standby
When the following cases occur, the horizontal vane returns to the closed position.
(a) When OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).
(b) When the operation is stopped by the emergency operation.
(c) When ON-TIMER is ON standby.
(6) Dew prevention
During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time
exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.
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