How to Replace a Ruud AC Contactor


A contactor in a Ruud air-conditioning system's condensing unit operates the compressor and the condenser fan motor. A Ruud contactor has a low-voltage control coil and a set of high-voltage contact points. When the control coil receives a 24-volt signal from a Ruud air handler's control circuit, the coil forms an electromagnetic field. This magnetic field closes the contact points. Once the contact points close, high-voltage travels through the contactor and turns on the Ruud unit. Always replace a contactor with stuck or carbon-covered contact points.

Things You'll Need

  • Screwdriver set
  • Masking tape
  • Pencil
  • Pliers
  • Place the air conditioning thermostat's function switch in the "Off" position, which prevents the inside unit from sending a 24-volt signal to the Ruud condensing unit.

  • Disconnect the electricity to the Ruud condensing unit at the disconnect switch. Follow the high-voltage wires from the unit to the metal box mounted on the side of the house. Open the box and either pull out the bus bar or flip the switch to the "Off" position.

  • Remove the screws holding the Ruud condensing unit's service panel with a 1/4-inch hex-head screwdriver. The service panel covers the side of the unit where the refrigerant lines enter the unit.

  • Slip a flat-head screwdriver into the seam between the bottom of the service panel and the condenser's lip. Twist the screwdriver and lift the panel off of the Ruud condenser.

  • Wrap a piece of masking tape around each contactor wire. Write on each piece of masking tape which Ruud contactor terminal the wire connects to. Because a Ruud contactor does not have clear terminal identification marks, use terminal position descriptions like "Top right," "Top left," "Bottom right," "Bottom Left," and so on.

  • Disconnect each wire from the Ruud contactor. Pull the wires with terminal connectors off of the contactor's blade terminals with pliers. Grip the connector not the wire. Loosen the four terminal screws holding the wires without terminal connectors with a Phillips screwdriver, then pull these wires free of the contactor.

  • Remove the two screws holding the contactor in the Ruud condensing unit with a 5/16-inch hex-head screwdriver. Pull the contactor from the unit.

  • Set the new contactor in the Ruud condenser and secure it with the two mounting screws.

  • Secure each wire to its respective contactor terminal using the masking tape tags as a guide. Press the wires with terminal connectors onto the contactor's blade terminals with the pliers. Tighten the terminal screws with the Philips screwdriver.

  • Replace the Ruud condenser's service panel and secure it to the unit with the panel screws.

Related Searches


Promoted By Zergnet



You May Also Like

  • Parts of a Magnetic Contactor

    A magnetic contactor is a relay-controlled switch used to turn a power control circuit on and off. It is electrically controlled and...

  • Difference Between AC & DC Contactors

    Alternating current (AC) and direct current (DC) contactors are found in many industrial motors, including many automobiles. The different contactors accomplish the...

  • How to Connect a Contactor

    By following a relatively basic step-by-step process, you can connect an electrical contactor in a matter of minutes. Contactors employ two distinct...

  • How to Test a Contactor

    Contactors are used to remotely switch electrical power. The coil-actuated switch operates exactly like a relay, but a contactor typically handles higher...

  • How to Troubleshoot Ruud Air Conditioners

    Air conditioning is a wonderful thing when it is working. Ruud air-conditioning systems are developed with energy efficiency in mind and should...

  • How to Repair a Contactor in a Heat Pump

    The contactor is an electrical component which is part of a condenser. A condenser is an out-of-doors unit which is part of...

  • How to Replace Auto AC O-Rings

    The air conditioning system on your vehicle is made up of several components. These components work together to create cold air, which...

  • How to Replace Fuses on Your Central Air Conditioner

    Replacing fuses on your central air conditioner simply involves removing the disconnect, popping out the two fuses and replacing them with new...

Related Searches

Check It Out

22 DIY Ways to Update Your Home on a Small Budget

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!