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Replace Contactor Relay on Rheem Air Condenser

I am replacing the double bareel 24 amp contactor relay switch in my Rheem air condenser. I purchased a non-Rheem contactor switch that is also double barrel and 24 amp. However, the connections do not match the original switch. Do I plug in the conncetion on the corresponding sides or is this much more difficult? Help please.

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I have a Rheem heat pump/airconditioner, Mod # RPFA-036JAS, that I have had problems with for at least 5 years and have paid over $1,000 in parts and service calls. I can vever recreate the problem when a tech is here. It usually happens in the middle of the night. I hear a Click, ckick, click sound, through the unit and it sounds like it is comming out of my air handler, but the outside unit also clicks at the contactor and the condensor cooling fan moter will start and stop about every half secongd or second. Both contactors have been replaced, the small one twice, one capaciter
has been replaced. I allow the unit too cool down and its alright for a few hours. That is difficult when the outside temp is below zero. HELP PLEASE!

Posted on Dec 10, 2009

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REPLACED BLOWER MOTOR ON LENNOX NOW THE FAN WILL BLOW FOR A BIT BUT THE COMPRESSOR DOESNT COME ON TO START COOLING

Posted on Mar 28, 2009

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You just need to go wire for wire on the contactor. You can also draw a wire diagram to make sure wires go into same spots.Make sure power is off for safety purposes. As long as amperage of contactor and voltage of coil is correct you should be fine.

Posted on Feb 16, 2009

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If you push the contactor and it runs why replace all that stuff??? You have to figure out where your 24 volts stops on its way to the condenser contactor. wire red green and yellow together at tstat, this should bring on indoor fan and condenser. if idf runs but cu does not you have an issue either going outside or a pressure switch is tripped. if nothing runs you have no 24, either a blown fuse, tripped float or bad transformer.

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Dave

Mar 11, 2010 | Heating & Cooling

1 Answer

4 ton rheem 3yrs old thermostat


It is possible that the relay in the thermostat for "cooling" has gone bad. The relay that runs the blower is different than the condenser relay. Check that you have 24v AC coming from the t-stat to the "y" terminal at the air handler. That same "y" wire should go out to the condenser, make sure then that you have 24v out there. If you have 24v at the condenser then see if the contactor is pulling in. If not then you may have a loss of charge switch that is stopping the current to the contactor. See if you have 24v to the coil of the contactor. If the contactor is pulling in and power is going to the compressor then the compressor has failed. If this is the case the condenser fan will be running but the compressor is not. If neither the condenser fan or the compressor is running then you have a problem in the 24v circuit, which could be a bad wire or a safety switch.

As you can see there are a number of possibilities for your problem. You will need to methodically go through everything to eliminate the possiblities till you isolate the problem,

I hope that this will help you to solve your problem and get you cooling again!

Thanks for using Fixya!

Heatman101

Nov 23, 2009 | Air Purifiers

1 Answer

Carrier A/C units


Double check that the new contactor has the same electrical ratings on it. My guess is that the coil should be 24v while the relay should be able to carry the same amperage at 220v.

First shut off the breaker and disconnect switch for the furnace and outdoor condenser and call a licensed HVAC contractor:)

If you are determined to do it yourself, Then read the schematics first. Be aware, if you mis wire the system you may cause more damage than you have now. Not to mention your personal safety is at risk.

I am basing this on the most common style contactor found in my area.

The main relay side should be labeled. (eg. L1,L2-T1, T2). These should match exactly like the old one. L1 and L2 are the incoming power. T1 and T2 are the power leaving the contactor. All the 220v wires should correspond to one of these four terminals either by screwing them down or fitting the spade connectors together.

Usually the 24v wires will plug onto the coil (near the bottom, left and/or right sides of the contactor) silver spade connectors.

(STEP 1.) Leave all Wires Connected to your Old Contactor.
(STEP 2.) Remove the two mounting screws that hold the Old Contactor to the Air Conditioners casing.
(STEP 3.) Now Install the New Contactor to the old contactors existing location using the Same two Screws.
(STEP 4.) Now take Off one wire at a time from your old Contactor and Install each wire one at a time to the proper location on the new Contactor.

Jun 24, 2008 | Carrier 38CKC042 Air Conditioner

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