A two-speed induction motor, commonly found in an air-conditioning system's inside unit, contains two circuits in one housing. Three wires deliver power to a two-speed induction motor: high speed, low speed and common. Many induction motors also connect to a capacitor with two wires. An induction motor uses a stationary stator, the ring-shaped coil with the windings wrapped around it, and a rotor that spins inside of the stator. The electricity flowing through the windings creates a magnetic field that causes the rotor to spin. The rotor's shaft extends through the motor's housing.
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- Needle-nose pliers
Turn off the electric supply to the two-speed induction motor's appliance. If the appliance the motor operates in plugs into a wall receptacle, then unplug the appliance. If the appliance is hard wired into a circuit breaker, then turn off the appropriate circuit breaker.
Inspect the two-speed induction motor's wiring chart, located on the motor's identification tag. The wiring chart identifies the induction motor's colour-coded wires and their functions.
Inspect the appliance's wiring diagram, often located on the panel that hides the induction motor. The wiring diagram uses a key, located on the side or bottom of the diagram, which identifies the induction motor, the capacitor and the motor's switch. It also labels the switch's pins and their functions. Many appliances use a fan relay as the switch.
Press the terminal connectors on the induction motor's capacitor wires onto the capacitor's terminals with needle-nose pliers. Usually, a two-speed induction motor's capacitor wires have brown-coloured insulation. Capacitors look like a galvanised-metal cylinder with a flat top and bottom. Its terminals mount to the top of the capacitor. Usually, the capacitor mounts to the appliance near the induction motor.
Route the three remaining two-speed induction motor's wires into the appliance's electrical box. The wires delivering electricity to the appliance enter the electrical box and connect to a terminal block. The electrical box contains the induction motor's switch terminals or the fan relay.
Press the terminal connector on the two-speed induction motor's common wire onto one of the terminal block's common pins with the needle-nose pliers. Most appliances and induction motors use white insulation on the common wire.
Press the terminal connector on the two-speed induction motor's high-speed wire onto the switch's, or fan relay's, pin labelled "High" with needle-nose pliers. Most two-speed induction motors use black insulation on its high-speed wire.
Press the terminal connector on the two-speed induction motor's low-speed wire onto the switch's, or fan relay's, pin labelled "Low" with needle-nose pliers. Most two-speed induction motors use red or blue insulation on its low-speed wire.
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