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Opinion Needed

post #1 of 7
9/2/12 at 3:48pm
Thread Starter 
Never thought I’d be posting in this section, but here is my question.

Picked up a used Sears Plasmaire, 12,300 Btu, R22, window box. When I was taking it apart I noticed a sticky substance mixed with dust on some of the interior surfaces around the compressor area and the fan motor. Do you think there is a refrigerant leak?

Garage temp = 31.6c @ 18% humidity

Evaporator w/ location of temp probe, about 30 minutes of run time.
Cold001.jpg

Cold side of the compressor
Cold002.jpg

Shot of temp after covering the probe with a rag.
Cold003.jpg

When I went out to shut down about 5 minutes after snapping the pic the temp was down to –18.6c, Thinking that R22 should do a little better than this?
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post #2 of 7
9/2/12 at 5:41pm
  • NoL
  • Extreme Cooler
What kind of sticky? Doubt there's a leak, you'd notice oil, and it would probably be running colder.
-20C for an uninsulated evap? That's about right.
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post #3 of 7
9/2/12 at 8:25pm
Thread Starter 
Quote:
Originally Posted by NoL View Post

What kind of sticky?
-20C for an uninsulated evap? That's about right.

Thanks for the answer

Basically the consistence of all most dry linseed oil. Felt around but couldn’t find anywhere that had and slipperiness between my fingers. How long it has been sitting no idea. Haven’t tried to clean anything so don’t know what will dissolve it.

&specool.gif
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post #4 of 7
9/2/12 at 8:46pm
  • NoL
  • Extreme Cooler
I see some crap on the pipes, but that could be rust or exposure to the elements or even just a smokers household (you'd be sickened if you saw some evaporator coils I've seen before).
But the accumulator is iced over, so at least its not YET undercharged. Get converting!
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post #5 of 7
9/2/12 at 10:11pm
Thread Starter 
It’s close, still a few parts on a list. Just a chill box for air at present, got the metal & torch skills though rusty, couple of decades ago. Still working on the refrigerate skills for latter, probably a different unit by then.

Thanks

Tested it this morning with a ambient of 25.5c and made sure the probe had better insulation, bottomed out at -27.6 a little better than I was hoping.
Edited by Aleslammer - 9/3/12 at 8:30am
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post #6 of 7
9/3/12 at 2:43pm
  • NoL
  • Extreme Cooler
Considering the load of ice and such, that seems fine. If you insulate up a box properly you'll get about -40C or so
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post #7 of 7
9/11/12 at 10:59am
Thread Starter 
Ordered most of the incidentals, fans, short cable extensions, switches and a couple face mount lcd temp probes for approximate temp readings. Have a thread in Cooling Experiments that I’ll update as I go along.

Still need to pick up another heater core before I start work, the evaporator is 10” x 20” and three heater cores will be 9.74” x 18” of surface. Optimistically the two 10” 12v radiator fans I decided on will have enough to pass through evap & cores with enough air movement for the board. They also have the added feature of producing enough heat to act as low wattage heaters giving faster access to the inside, surprised me that they would run on 5v.

With a possibility of -40c figured I’d look for a coolant with better numbers than glycol. Found a promising candidate based on potassium formate, prices over in Europe looked reasonable, or I miss calculated in my head, at $125 a gallon from a US supplier, it’s back to anti freeze and a better pump.

Thanks again
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