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CRAZY FRIDGE

thermostat ADC-card defrostproblem

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2 replies to this topic

#1 strumpfman

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Posted 16 June 2013 - 09:57 AM

I'm dealing for a customer with a WHITE WESTINGHOUSE fridge/freezer (RTD 18WWCW5 ser: BA 81817611) this is probably an export model made by White Consolidated Ind in Cleveland Ohio.

The original complaint was that vegetables were freezing in the food compartment probably because the thermostat was stuck and the compressor running  all the time. I bypassed the thermostat and connected the fridge with a timer socket  running 45 min on 30 minutes off and was good for 3 weeks.( I did this because I knew it would take a long time to get a new thermostat) Now the evaporator was icing over and I went over twice in a month to do a manual defrost. Both times when I pressed the defrost button on the card it defrosted, so heater + defrost stop OK.The second time I put the original thermostat back in because it operated OK when I sprayed with liquid freon and I also gently tapped the relay on the ADC-card.The fridge was fine for a month and now the thermostat is stuck once more,Customer put timer back in socket and now there is a defrost problem again. Is there a relation between thermostat and ADC card. I finally got the new thermostat but I am hesitating to put it in because if there still is a defrost problem once I have opened the  thermostat I can not return it!!

Here are my questions:

1. What controls the defrost frequency on this ADC-card(thermostat,light in food compartment  or other)

2.Can I replace the ADC-card with a regular mechanical defrost timer(25 min every 6 hours) or an SUPCO defrost timer with adjustable time and defrost frequency

3. Is there a logic explanation that there is a defrost-problem ever time the thermostat is stuck.



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#2 Spannerwrench

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Posted 16 June 2013 - 11:48 AM

I'm not that familiar with that model Adaptive Defrost System, but with most brands, the defrost has a direct correlation to the thermostat cycling on and off. I would replace the thermostat since you said it worked after you semi fixed the t-stat. You may find out that there was too much run time or something. But, I wouldn't waste refrigerant on a thermostat like you did, not only is it expensive, but it's illegal.

Here's a leak to the Whirlpool Brands automatic and adaptive defrost cycles that may help you understand how most ADCs work.

https://www.dropbox....ost_systems.pdf

Here's one for GE ADCs.

https://www.dropbox....Diagnostics.pdf
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#3 RegUS_PatOff

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Posted 16 June 2013 - 01:37 PM

I can't find any info on that model,
but the modified way you had it, the ADC may accumulate Compressor run time,
but it's timing gets reset upon power outage ...
... never Defrosts
 


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