PIPE 0991725 - Caterpillar

Illustration 1 g01659993
(5) Actuator (air Outlet)
(6) Actuator (air Inlet)
(7) Actuator (air temperature) The unit for the heater/air conditioner contains three actuators which control the position of air dampers.When the related switch is operated from the control panel, power is supplied to terminal 6 or 7 of the actuator. The direction of rotation varies according to the terminal that receives power. Each actuator has a variable resistor. The amount of resistance varies according to the speed of the actuator. The control panel supplies 5 V voltage to the variable resistor. The control panel detects the position of the damper by measuring the voltage difference. The control panel then stops the power supply to the actuator when the designated position is detected. The designated position is set at the control panel.Note: If power is supplied directly to the actuator, do not drive the actuator. The output shaft of the actuator could be damaged. The winding of the actuator could break.Actuator (Air Inlet)
Illustration 2 g01131320
(13) Detection switch for fresh air
(14) Detection switch for recirculated air
(15) Contact point for air recirculated air.
(16) Contact point for fresh air The actuator operates in conjunction with the detection switches. In this case, the detection switch for fresh air and the detection switch for recirculated air work with the detection switch for the position of the actuator.For example, when the control switch is changed from fresh air to recirculated air, the contact point moves. As a result, the power supply is suspended and the contact point stops at the position for fresh air.Actuator (Air Outlet)
Illustration 3 g01131704The microcomputer sends signals to the actuator. This changes the discharge positions in order to control the damper position for the following settings:
Face
Face and Floor
Foot
Foot and DefrostAir Mix Actuator
The air mix actuator is for the air temperature control. The actuator opens and the actuator closes the air mix door. The air mix actuator has a potentiometer that connects with the shaft of the actuator.The target position of the air mix door is determined by the temperature control switch. The potentiometer of the actuator sends data to the control module. The control module will determine the direction that the actuator will rotate.