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Wiring diagram for a relay switch on a whirpool refrigerator

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Posted on Jan 02, 2017

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SOURCE: kenmore refrigerator compressor relay and

The method of starting the compressor on very old units was that a real relay would close its contacts for a few seconds shorting the connection of the start(S) post on the compressor with the run(R) post thus feeding power to the start coil in the compressor for a few seconds. Well, I guess the bright design boys/girls were told to design for less cost and eliminated the real relay altogether. In its place they made a little plastic holder that has a disc type thermistor inside it. Normal resistors have a negative temperature coeficient meaning that as temperature goes up the resistance goes down. Thermistors do the opposite so as temperature goes up the resistance also goes up. They stuck one of these little thermistor discs about the size of a penny and just about as thick between the S and R terminal posts on the compressor so that when the thermostat in the refrigerator calls for more cooling power goes to the R post and through the thermistor disc to the S (start coil) post thus energizing the start coil in the compressor and giving it the jolt it needs to get going. Since the thermistor is left connected across there it heats up from the current going through it. I measured the cold resistance of one disc at exactly 5 ohms. Using ohms law of voltage squared divided by resistance gives us for a 120 vac circuit quite a bit of power: 120 X 120/5 or around 2880 watts that might be needed to be dissipated by that little disc thermistor every time the compressor kicks on. Of course the thermistor gets really hot and its resistance goes up thus limiting the current and everyone is happy...for a while...years if you are lucky. Back in the 1960's I worked at Western Electric Co.'s Lees Summit, MO plant and was responsible for lines making thermistors including the disc type...they do a great job for the telephone company where not much current goes through them...but for high current applications such as controlling starting of refrigerator compressors the "black cookie dough" they are made of gets real hot...I mean really hot...and the dough dries out even more and finally breaks down often shorting out and leaving a black carbon mess all over everything plus the heat can cause a fire...so the old design was better as far as I am concerned using relays that often lasted 40 years with no maintenance. I digress...again... I just repaired yesterday a Kenmore side by side that was thrown away on the street...with melted run terminal post on the compressor from the blown up thermistor and it was thought by them and the service guy that the compressor was bad as well. An ohmmeter check showed indeed that all the compressor terminals were shorted to each other and to the compressor case ground. I then unbolted the compressor and gently bent the freon containing copper tubing allowing me to pull the compressor out to give good access to the terminals. I wire brushed the three terminals and around them on the compressor real good and cleaned it up using carburetor spray cleaner, allowed it to dry completely and retested with my meter and...behold...no more terminal shorts to anything and the resistance measured of the coils inside the compressor were good readings.... so... I then made a test cable which would plug into a 120 vac outlet. I then connected the 120 vac between the common(C) and run(R) compressor terminal posts while simultaneously using another wire through a push button switch to feed power also to the start (S) terminal for perhaps 2 seconds...alla kerzam...the compressor started and ran fine. I left it running for a while and found that a cup of water froze in the freezer compartment in about 1 hour. Then I installed a new thermistor unit and jerry rigged a way to make connection to the melted stub on the run(R) terminal, put the whole compressor etc. back in the unit, put the cardboard cover on and it has now been doing an excellent job of cooling ever since. You may not want to go to all this trouble...but..hey...I got a 2 year old side by side kenmore that the people said they paid over $1000 for and I only spent $22.88 on it on internet for a new start thermistor/overload module...even so, I would have preferred to use a start relay.

Posted on Aug 21, 2009

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I have a whirpool american fridge freezer s20brbb20 temp display flashes and you can hear a relay clicking but every thing seems to work o.k.


:
Hi!
A relay starts the compressor with a higher voltage and then quickly kicks out
It does a lot of clicking (trying to start over and over again)
If thats what is happening with yours
Its best for a tech to replace The relay but you can do it
Take your model number to your Local Appliance parts store they will have a diagram
showing you how to install the relay. Its called a hard start relay
I use part no ERP410 POWER START RELAY, CAPACITOR AND OVERLOAD all in one. (110 v)

If you still have trouble Go Here:

http://www.applianceaid.com/procedures.html

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Leo Ponder
PLEASE VOTE FOR ME IF THIS WAS HELPFUL

Oct 05, 2011 | Refrigerators

1 Answer

I have a Whirpool refrigerator. it turns off by itself and never return on. when Shak it it will turn on then within one to two hours it wil turn off back.


NOTE: This
is a multi-solution answer since I don't have all the tech from your question to pinpoint your problem
But the solution is in here generically, if you read and study the solutions very,very carefully.

Sounds like the cold control has stuck . Unplug the two wires from the cold control and plug them together. Turn one wire over and plug it into the other. away from the cold control.
The cold control is the knob in the ref that turns it on and off and has numbers on it. (Thermostat)
If it runs then that cold control (Thernostat) is the problem.
If that doesn't work DO THIS:
The relay on the compressor may need replaced
A relay starts the compressor with a higher voltage and then quickly kicks out
Thats what is happening with yours
Its best for a tech to replace The relay but you can do it
Take your model number to your Local Appliance parts store they will have a diagram
showing you how to install the relay. Its called a hard start relay
also try hooking the two wires together on the cold control to route around the cold control.

If you need more help GO HERE:

http://www.applianceaid.com/procedures.html

Thank you for using fixya
Leo Ponder
PLEASE VOTE FOR ME IF THIS WAS HELPFUL

Sep 13, 2011 | Whirlpool Refrigerators

1 Answer

My Dad has whirpool Gladiator it only cools to 50 deg in the freezer . We unpluged it and let it set over night to see if it was a defrost problem.Compressor cycles and then shuts down @ 50 deg Still will...


Sounds like the cold control has stuck . Unplug the two wires from the cold control and plug them together. Turn one wire over and plug it into the other. away from the cold control.
The cold control is the knob in the ref that turns it on and off and has numbers on it.
If it runs then that cold control is the problem.
If this doesn't work Do this

That is probably the compressor relay or cold control (Thermostat
The relay is on the compressor and needs replaced
A relay starts the compressor with a higher voltage and then quickly kicks out
Thats what is happening with yours
Its best for a tech to replace The relay but you can do it
Take your model number to your Local Appliance parts store they will have a diagram
showing you how to install the relay. Its called a hard start relay
also try hooking the two wires together on the cold control to route around the cold control.

Thank you for using fixya
Leo Ponder
PLEASE VOTE FOR ME IF THIS WAS HELPFUL

Aug 16, 2011 | Whirlpool Gladiator Refrigerator

1 Answer

Free Refer Hotpoint csx27dma. Owner had two new parts for the compressor. a start switch and an overload switch. The compressor has 3 round connection prongs for these parts to fit on to. Installed...


From cabinet you have three wires. 2 Orange,and 1, Black
1 Orange goes to on side of run capacitor the other Orange goes to the (2) R on the relay. The Black goes to the overload (round black disk). 1 White wire connector on end goes to run capacitor the other end connects to the (1) S on the relay.
The run capacitor is a small black cube like device with two prongs.

Oct 26, 2010 | Hotpoint HSS25IFMCC / HSS25IFMWW Side by...

1 Answer

Wiring diagram for 8201555 compressor installation


You should not need a wiring diagram for the compressor. You have overload relays and most only need 2 wires. Line and common. If you have an orange wire then that will be a neutral also.

Mar 02, 2010 | Kenmore 57029 Side by Side Refrigerator

1 Answer

Need a wireing diagram for whirlpool refridge ET18PKXWN10


The diagram is usually located in a pouch you can see when you remove the bottom vent. It has all sorts of service information, including a wiring diagram. Otherwise whirpool.com may have it.

Aug 25, 2009 | Refrigerators

1 Answer

Whirpool Washer LSQ9500LQ0 Won't Spin or Drain


Your belt assessment sounds correct on the dryer problem.
If you can, restore the lid switch connections, and operate the switch during what should be spin. You should be able to hear a relay or solenoid clicking off and on with the switch.

Aug 01, 2009 | Whirlpool Ultimate Care II LSQ9549L Top...

1 Answer

Refrigerator continuously cycles


This is a generic problem with Whirpool refrigerators.The start relay for the compresor(located on the side of the compresor under the black plastic cover) is probably bad ,replace it(about $ 20) with a new one(write down where the wires go) that should solve the problem if not the compresor is bad.

Apr 15, 2009 | Whirlpool Refrigerators

1 Answer

WHIRPOOL ED2


Not enough model to get the wire diagram. It sounds like a diode is out in the water valve harness. If it is using the triple valve on that unit.

May 08, 2008 | Whirlpool ED2FHEXN Side by Side...

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