Air Door: Description and Operation

CIRCULATION DOOR

DESCRIPTION
When vacuum is supplied to the actuator, the door moves to the Recirculation position. The actuator is spring loaded so the door moves to the Outside-air position when there is no vacuum supplied.

OPERATION
Normally vacuum is supplied to the actuator by placing the Circulation control knob in the Recirculation position. The operation of the door can be viewed by removing the blower motor and looking up into the unit inlet.

NOTE: If the Mode control is at or near the Defrost position, vacuum will not be applied to the actuator regardless of the position of the Circulation control knob. This is to prevent window fogging.