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HVAC
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CIRCUIT DIAGRAM
MODE ACTUATOR
The mode actuator is a high-torque, bi-directional
actuator with position feedback and is used to control
the position of air distribution flap, according to the
mode set by the user. The outputs are fully compati-
ble with all physical aspects of directly driving a
motor such as the occurrence of transients at motor
turn-off due to back EMF. The Mode control will be
functional throughout the Ignition is On.
Mode knob controls the servomotor. When the knob
is turned from Chest/ Chest-Leg/Leg Mode to Leg-
Defrost/ Defrost Mode, the Air Inlet door is moved to
the Fresh Air Mode and Power A/C is selected. On
turning the knob back to Chest/ Chest-Leg/Leg Mode
from Leg Defrost/ Defrost Mode, the last selected
settings are restored (provided that there has been
no user intervention in between).
The Mode knob Rotary ring Total Rotation Span is
270° with 5 detents, each of 67.5° (between detents),
including both the end positions. The Position of the
mode actuator is based on the Knob position of the
Control Panel during the Ignition ON / OFF.
PINOUT
Pin NO.
Rotation from
Face to Def.
Position
Rotation from
Def. to Face Po-
sition
1
Ground (Pot)
Ground (Pot)
2
Feedback Signal
From pot. to
Control Panel
Feedback Signal
From pot. to
Control Panel
3
+Ve (Pot.)
+Ve (Pot.)
4
NC
NC
5
Motor Grd.
Motor +Ve
6
Motor +Ve
Motor Grd.