Air Speed
The HVAC control assembly applies a ground to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
- Low speed, 3 resistors
- Medium 1 speed, 2 resistors
- Medium 2 speed, 1 resistors
When the operator requests High speed, the HVAC control assembly activates a relay which applies direct ground to the blower motor.