How-To Wire Condenser Fan Motors correctly in 3-Wire & 4-Wire designs

How-To Wire Condenser Fan Motors correctly in 3-Wire & 4-Wire designs

“My original condenser fan engine has three cables additionally the replacement condenser fan motor that I bought has four cables – did we choose the incorrect engine?”

This really is probably the most common post-transaction question that individuals receive from clients which have recently bought replacement condenser fan engines. To put it simply, no – you ldssingles help failed to choose the condenser fan motor that is wrong. While most initial condenser fan engines have only three wires, it is common for replacement condenser fan engines to own four. This guide will explain simple tips to wire your brand-new condenser fan engine employing a four cable setup or a three cable setup when making use of a solitary run capacitor or perhaps a run capacitor that is dual.

Overview of the elements:

In the event that you remember from our residential cooling period guide, outside condenser units use a switch known as a contactor. This switch is managed because of the thermostat and closes to accomplish a electric circuit whenever electricity should be provided to your condenser fan engine and compressor. Think about the contactor very nearly being a gatekeeper – two feet of 115 volt electric supply need to move through it in order for your body to operate correctly.

Condenser devices additionally make use of a component known as a run capacitor. Run capacitors enable condenser fan engines and compressors to efficiently run more and they’re ranked by way of a product of dimension called microfarad. Double run capacitors can be used for both your condenser fan engine as well as your compressor. Single run capacitors are employed solely for just your condenser fan engine or perhaps your compressor. Such as your contactor, your capacitor has to be wired properly to help it to function properly.

Utilizing a run capacitor that is dual

You’re only going to use three of the four leads coming off the new condenser fan motor if you’re using a dual run capacitor.

You’re planning to wire the black colored result in where in actuality the black colored lead on your own previous condenser fan engine ended up being wired to. This would be back into your contactor. You’re likely to wire the white result in where in actuality the white lead on the previous condenser fan engine ended up being wired to. This tends to function as the “C” or “Common” terminal on your own twin run capacitor. Finally, you’re going to wire the lead that is brown where your past brown lead had been wired to. This would function as “F” or “Fan” terminal on your double run capacitor. The brown lead with the white tracer will never be useful for this setup. You need to use a cable nut and tape that is electrical connect it well.

NOTE: you will need a jumper involving the “C” or that are“Common on the capacitor plus one leg regarding the contactor.

Utilizing a run that is single with a four wire setup:

If you bought a unique condenser fan engine with a brand new single run capacitor, this is the wiring setup that you will be making use of. You’re likely to wire the black colored result in where in fact the black lead on the past condenser fan engine had been wired to. This tends to be back once again to your contactor. You’re planning to wire the lead that is white to another leg of the contactor. You are planning to wire the brown result in one group of terminals in your brand brand new capacitor and you also’re likely to wire the brown lead using the white tracer to another group of terminals.

Utilizing a run that is single with a three cable setup:

If you bought an innovative new solitary run capacitor while the condenser fan engine that you are only using has three leads coming away from it, this is the wiring setup that you will be making use of. You are planning to wire the lead that is black to where it absolutely was formerly wired. This tends to be back again to your contactor. You are going to wire the lead that is white one pair of terminals in your brand brand new capacitor. You’re want to to wire a jumper with this collection of terminals returning to one other leg in your contactor. Finally, you will wire the brown resulted in opposing collection of terminals on your own brand new run capacitor compared to the typical lead.

Sum all of it up:

Almost always there is a feeling of fulfillment whenever doing a project your self, but wiring a fresh condenser fan motor and run capacitor could be a little tricky when you haven’t done it prior to. Security is almost always the greatest concern. Ensure that the electrical supply to the condenser product is disconnected prior to starting any work. Make use of your multimeter to ensure the disconnection. They will be more than happy to complete this task for you if you’re not comfortable working with electricity, contact a local HVAC contractor and.

It is extremely helpful to report the area of current cable connections before getting rid of the condenser fan engine or run capacitor. Work with a digital digital camera to just just take images of this connections and reference the pictures whenever setting up the condenser that is new engine and run capacitor.

For a artistic image of typical wiring designs, guide listed here guide: HVAC Condenser Fan engine Wiring Diagram.

Finally, this guide will be used being a basic summary of typical condenser unit wiring schematics. Some condenser fan engines cable to a circuit board while others utilize proprietary plugs with their connectors. We strongly suggest referring back once again to your product’s manual for appropriate wiring guidelines.

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