Everything HVAC Contactors

Contactors For Heat Pumps & Air Conditioners

Go to Parts-HVACParts-HVAC linkParts-HVAC:Contactors and Relays for HVAC are available at Wholesale and Quantity Pricing. Shop our Parts HVAC Online Store for Transformers, Contactors, and Relays HVAC Supplies and Accessories. Also find hard to find Transformers, Contactors, and Relay replacement parts.
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Go to EatonEaton linkEaton:Eaton offers the most complete line of definite purpose contactors and motor starters in the industry.
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Go to HVAC Parts OnlineHVAC Parts Online linkHVAC Parts Online:Here you will find our selection of top quality contactors and relays for the HVAC industry. Heating and cooling equipment required high voltage controls that can endure thousands of cycles under extreme conditions. We offer only heating and cooling contactors and relays that can live up to those standards.
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Go to Arnold's Service Co.Arnold's Service Co. linkArnold's Service Co.:Let us help you repair your air conditioner or heat pump! We sell many different brand new OEM heat pump and AC contactors.
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Go to PrestoPresto linkPresto:Contactors - HVAC | Presto Maintenance Supply
– http://www.prestosupply.com/hvac/contactors

HVAC Replacement Parts

Go to CapacitorsCapacitors linkCapacitors: HVAC Systems

HVAC Contactors and Control Relays

Most heat pumps and central air conditioning systems have a high-voltage switching device in the condensing (outdoor) unit called a contactor. Most contactors are controlled by a low-voltage electrical circuit which magnetically energizes a coil causing the metal contacts to engage (close). This supplies high voltage to the compressor, fan motor and any other high-voltage components. Standard contactors have one, two or three sets of contacts (poles) depending on the system's electrical requirements. A double pole contactor has two sets of contacts and both need to be engaged (closed) for the unit to work properly. A single pole contactor allows one leg of the high-voltage circuit to constantly supply power to a component. You will find these mostly in heat pumps. The heat pump's compressor has a heater that warms its oil in cold conditions. If you find that an outdoor condensing unit is not running and the poles are open, do not assume it's a defective contactor. TECH NOTE: Remember, just because the contacts show open, there is still high voltage supplying the contactor! Turn the power off to the condensing (outdoor) unit before handling a contactor. There are so many reasons why a contactor would show open. Check for low voltage current supplying the magnetic coil. If you are getting proper low voltage readings, check the contactor for defects like burnt or pitted metal contacts. Make sure there is nothing from causing the contacts not to close like bugs, nests or dirt. If the high-voltage electrical connections on the contactor shows burnt wires or even melting, there is a high voltage problem in a component causing this. Do not replace a contactor assuming this will remedy the problem. The component or reason this occurred (burnt wires or melting) needs to be repaired. If you are not getting a low voltage current to the contactor's magnetic coil and the metal contacts look clean, there is a problem with the system's low-voltage circuit wiring or a low-voltage sensor or device (ie. thermostat) that is causing the problem. TECH NOTE: If you find that the contacts are closed and you are getting the proper voltage coming to and from the electrcal connections on both sides of a contactor, you have a defective high voltage component. See Capacitors. If you find that the contactor is defective, replace it with the same type (poles), voltage and ampere (amp) rating. The easiest way to replace a contactor is wire-to-wire from old to new. TECH NOTE: When removing a contactor or contactor's wires, turn off power to BOTH indoor and outdoor units. (ie. condenser and air-handler / condenser and furnace).

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