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mikethe ductman 07-30-2010 09:16 PM

134A refer question
So if R12 run around a 20-16 psi suction @ 15-20 degrees.
What should a 134A frige. run at?
I have a little prep. station/frig. that the compressor is running all the time and it will only get down to 50 degrees.

beenthere 07-31-2010 05:57 AM

14 to 18.

jomama 07-31-2010 12:29 PM

if your suction pressure is that low and box temp at 50 what is discharge psi

beenthere 07-31-2010 02:56 PM


Originally Posted by jomama (Post 478217)
if your suction pressure is that low and box temp at 50 what is discharge psi

I don't think he said his vapor pressure is that low.

mikethe ductman 07-31-2010 05:45 PM

I just took a look at the unit.
Box temp was around 50, suction pressure around 12-13 and cond. coil was dirty.
I cleaned the coil but little to no change on suction pressure.
Eased a littlr R134 in, got the suction pressure up to 18.
Looks like its not the first time being toped off, king valve looked a little chewed up.
I will follow up on it Monday to see if its working better.

beenthere 07-31-2010 07:19 PM

Did you check the SH and SC?

At temp, the vapor line will be around 14 to 18.

On a warm box, it will be around 28 to 30.

mikethe ductman 08-02-2010 05:46 PM

I went back by today.
The temp droped to 38 degrees.
The owner had replaced the t-stat some time ago.
He said it was set at 22 degrees
I don't know if the system will pull down that far, he keeps the unit between an oven and a pizza oven.
I will recheck the pressures next week.

beenthere 08-02-2010 05:48 PM

LOL... pizza shop. Get the cheese and flower out of the condenser.

jomama 08-03-2010 12:05 AM

he will need a jackhammer that stuff is like cement

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