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Old 07-20-2010, 07:54 PM   #1
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Picked up a pepsi cooler today for $75

Ad said out of freon or bad comp.

Its the comp.

Its an older R12 system

Should I convert to 134A or go back with R12?

I have both freons here, heard R12 is alot colder.

The system has 1 cond. fan 2 evap. fans and looks like a cap tube.

Are R12 new comp. still around?

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Old 07-20-2010, 08:24 PM   #2
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They still make compressors that can use R12.

12 isn't any colder for med temp applications.

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Old 07-20-2010, 08:30 PM   #3
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Do you think 134 will keep up?
The door gasket ain't that good, and if its in a store the door will be open alot.
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Old 07-20-2010, 09:12 PM   #4
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Replace the door gasket, you can order them from a refrig wholesaler if you have the dimensions etc. If it is too leaky it will allow lots of moisture in and you may have a frozen evap coil problem.
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Old 07-20-2010, 09:35 PM   #5
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If 12 can keep up, then so can 134A.

As above. Fix the door gaskets.
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Old 07-21-2010, 03:25 AM   #6
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All right, I will let the bottom line tell me to go 12 or 134.

I was thinking that a cap tube/fixed orifice might have a hard time keeping up with 134A.

As for the gasket, its hard to invest $400 into a $300 frig. might not even be worth fixing the compressor.
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Old 07-21-2010, 07:03 AM   #7
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Its not he cap tubes that would be the hold back. Its the condenser.
134A is slightly less efficient.

In most coolers. It simply means that the cooler will run slightly longer, to do the same job.

Not a problem, unless the cooler will be constantly filled up with all warm product.
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Old 07-22-2010, 08:56 AM   #8
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I stayed with an R12 compressor.
Got it in last night, vaced. it down this morning.
Put in 2 12 oz. cans of r12, she's kicking out some cold air.
Does the evap. fan run all the time?
It won't cycle with the compressor.
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Old 07-22-2010, 10:58 AM   #9
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Yes, the evap fan runs 24/7.

How low is the cold control set? Or is it set up on a pressure control.
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Old 07-22-2010, 11:16 AM   #10
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No pressure controll just a t-stat, numbers 1-8
I am sure it needs more R12, suction line starting to freez at compressor, evap looks OK.
Suction pressure around 30
Should it be around 40-45?

Last edited by mikethe ductman; 07-22-2010 at 11:30 AM.
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Old 07-22-2010, 11:32 AM   #11
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Quote:
Originally Posted by mikethe ductman View Post
No pressure controll just a t-stat, numbers 1-8
I am sure it needs more R12, suction line starting to freez at compressor, evap looks OK.
Suction pressure around 30
Should it 40-45?
Probably more like overcharged.

At 40 PSIG, R12 has a saturation temp of 43F. So it would never make the drinks cold.

Lots of those units run 20PSIG when the box is at temp. Some as low as 16PSIG.

Should run around 10SH on a cap tube system.

Take some charge out.
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Old 07-22-2010, 11:50 AM   #12
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When the box was warm it was 32 psi

Now its at 23 and the line temp is 33.

Looks like 10 superheat.
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Old 07-22-2010, 11:56 AM   #13
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If your frosting at 23PSIG. Then you got less then 10 SH. Since that would give you a line temp of 32.9

Whats the temp in the box at 23{SIG?
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Old 07-22-2010, 12:06 PM   #14
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BTW thanks for your help.

Compressor cycled off, t-stat was set at 7 out of 9 setting.

Box temp was 43

It's sitting out side "not in the sun" and it's 90 degrees outside.

The line will frost up then thaw out.

Last edited by mikethe ductman; 07-22-2010 at 12:08 PM.
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Old 07-22-2010, 05:21 PM   #15
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Thats an overcharge.

43 is a high shut off temp.

If you ever replace the cold control. Get a constant on control. Makes sure the coil is thawed before it will turn the compressor back on.

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