Two-speed AC blowers move air through air conditioning and heat pump type systems. These blowers use a low speed and high speed field coil to change the speed of the motor. This allows the user to be able to change the airflow conditions through the system to increase or decrease cool and comfort level. Wiring a two-speed motor requires time, patience and the observance of electrical safety rules. Bad wiring can cause damage to the equipment and the operator.
Instructions
- 1
Disconnect power to the circuit that will provide power to the blower. Check the AC blower motor and motor documentation for a wiring diagram for the motor. If this cannot be found, contact the motor manufacturer for these documents. This type of motor usually has three terminal connections: low speed, high speed and the common terminal.
2Connect the common terminal to the negative terminal of the car battery if this is a direct current motor. If this is an alternating current motor, then connect the common terminal to the white wire of an AC power junction box. Turn the power back on and test the motor by switching it from "OFF" to "LOW" to "HIGH" and then back to "OFF."
3Connect the low and high speed terminals of the motor to the low and high speed terminals of the switch. Finally, connect the power terminal of the switch to the positive or hot wire of the power source.
