small fridge defrost

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Old 09-27-19, 07:25 PM
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small fridge defrost

I have a small FrigidaireFF. Its 11 years old. I have to do manual defrosts and after them it runs very well.
This time I removed the foam and plastic in the top compartment and saw the evaporator. Caked in Ice.
It speeded up the defrosting with the foam out of the way. The next day it was melted completely.
But when I touched the radiator grill it wasnt cold. This is where the fr123 is expanded and should be cold,no? Cold when its a gas and hot when its being compressed,yes?
why wasnt it cold??( evaporator might not be the right term).
 
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Old 09-27-19, 08:14 PM
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Yes... that is the evaporator. It is the cold coil. It sounds like the compressor is not running.
Check around back to see if it's warm/hot to the touch.

If the compressor is running and warm..... did you use any sharp tools to chip the ice ?
If you did.... you may have punctured the line and allowed the refrigerant to escape.
 
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Old 09-29-19, 03:14 PM
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I didnt say it wasnt working..it is.... I was just wondering why the evap wasnt cold when I touched it
unplugged. So it only feels cold when the compressor is on??? Why would that affect the expanded
state temp...the FR123 doesnt need a compressor to expand,no??
 
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Old 09-29-19, 06:02 PM
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Put this in a google search and it will explain it better than I could.
refrigerator theory of operation
 
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Old 09-29-19, 06:48 PM
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That should use R-134A or HFC-134A.

The compressor compresses the vapor into a hot gas that as it cools in the outside condenser coils turns back to a liquid. The liquid refrigerant at high pressure is metered into the evaporator coil and cools down as it flows thru the coils. The refrigerant absorbs the heat and the fridge and freezer get cold. As it absorbs the heat it converts back into a gas and returns to the compressor.

If the compressor is not running..... there is no cooling taking place as the system pressures are equal.

The diagram illustrates the system. It shows fans..... yours may not use fans.
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