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HVAC
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13. MODE & TEMPRATURE CONTROL AC-
TUATOR
The temperature actuator is a high-torque, bi-
directional with position feedback actuator is used to
control the position of Temperature motor flap via the
Temperature control voltage. The outputs are fully
compatible with all physical aspects of directly driv-
ing a motor such as the occurrence of transients at
motor turn-off due to back EMF. The temperature
control will be functional throughout the Ignition is
ON.
The Temperature Control Rotary Knob (Ring) allows
the user to mix the Hot and Cold air, to select the
various combinations by rotating clockwise. Temper-
ature knob controls the servomotor. Total Rotation
Span is 270° with 31 positions (30 detents) each of
9°. The Position of the Temperature actuator is
based on the Knob position of the Control Panel dur-
ing the Ignition ON / OFF.
CIRCUIT DIAGRAM
PINOUT
Pin
NO.
Rotation from
max Hot to max
Cool Position
Rotation from max
Cool to max Hot
Position
1
+Ve (Pot.)
+Ve (Pot.)
2
Feedback Signal
From pot. to Con-
trol Panel
Feedback Signal
From pot. to Control
Panel
3
Ground (Pot)
Ground (Pot)
4
NC
NC
5
Motor +Ve
Motor Grd.
6
Motor Grd.
Motor +Ve
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/LegMode
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.