Auxiliary Low Blower Speed

When the Low blower speed is selected by the front auxiliary HVAC control assembly, the blower motor switch provides a path to ground for the low speed blower motor relay coil using the auxiliary blower motor low speed control circuits, ground circuits, the rear auxiliary HVAC control assembly, and the splice pack. When the coil is grounded, the switch inside the relay is pulled over and power is delivered to the auxiliary blower motor resistor. Voltage is dropped across the entire resistor to achieve the proper blower speed. The auxiliary blower motor is grounded through the ground circuit and a splice pack.

When the Low blower speed is selected by the rear auxiliary HVAC control assembly, the front auxiliary HVAC control assembly must be placed in the REAR CNTL position, allowing a path to ground. Ground is provided for the low speed blower motor relay coil using the auxiliary blower motor low speed control circuit, auxiliary blower motor control circuit, auxiliary HVAC control processor, auxiliary HVAC switch supply voltage circuit, front and rear HVAC control assemblies, ground circuits, and a splice pack. When the coil is grounded, the switch inside the relay is pulled over and power is delivered to the auxiliary blower motor resistor. Voltage is dropped across the entire resistor to achieve the proper blower speed. The auxiliary blower motor is grounded through the ground circuit and a splice pack.