Mitsubishi MSH-A18WV Service Manual page 14

8-6. 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 (approx. 12V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode changes as follows by pressing the VANE button.
(3) Positioning
The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle.
Confirming of standard position is performed in case of follows.
(a) When the OPERATE/STOP (ON/OFF) button is pressed. (POWER ON/ OFF)
(b) When the vane control is changed from AUTO to MANUAL.
(c) When the SWING is finished.
(d) When the test run starts.
(e) When the power supply turns ON.
(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.
In COOL and DRY operation
In HEAT operation
(5) STOP (operation OFF) and ON-TIMER standby.
When the following cases occur, the horizontal vane returns to the closed position.
(a) When the OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).
(b) When the operation is stopped by the emergency operation.
(c) When the ON-TIMER is on standby.
(6) Dew prevention
During COOL or DRY operation at Vane Angle 4 or 5 when the compressor cumulative operation time of compressor
exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.
(7) SWING MODE (
By selecting SWING mode with the VANE button, the horizontal vane swings vertically. The remote controller displays
" ".
(8) Cold air prevention in HEAT operation
When any of the following conditions occurs in HEAT operation, the vane angle changes to Angle 1
automatically to prevent cold air blowing on users.
Compressor is not operating.
Defrosting is performed.
Indoor coil thermistor RT12 reads 24: or below.
Indoor coil thermistor RT12 temperature is raising from 24°C or below, but it does not exceed 28:.
Indoor coil thermistor RT12 temperature
NOTE: If the temperature of RT12 reads from 24: to 28: at the air conditioner starting, this control works.
1
AUTO
Horizontal
)
Released
Cold Air Prevention
2
3 4
Middle
Vane angle is fixed to Angle 1.
Vane angle is fixed to Angle 4.
24: 28:
14
5
Downward Swing
Horizontal vane
Set position
Angle 1