Medium Blower Speeds

When the Medium 1 (M1) blower speed is selected, the HVAC control assembly applies voltage to the blower motor resistor assembly through the medium 1 blower motor control circuit. Voltage is divided between 2 series resistors, 2 thermal fuses and the blower motor to achieve the desired blower speed. The blower motor is included in the series circuit by the blower motor supply voltage and ground circuits. The blower motor resistor assembly provides a pathway to ground for the blower motor.

When the Medium 2 (M2) blower speed is selected, the HVAC control assembly applies voltage to the blower motor resistor assembly through the medium 2 blower motor control circuit. Voltage is divided between a series resistor, a thermal fuse and the blower motor to achieve the desired blower speed. The blower motor is included in the series circuit by the blower motor supply voltage and ground circuits. The blower motor resistor assembly provides a pathway to ground for the blower motor.