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Old 07-30-2010, 09:16 PM   #1
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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.

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Old 07-31-2010, 05:57 AM   #2
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134A refer question


14 to 18.

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Old 07-31-2010, 12:29 PM   #3
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134A refer question


if your suction pressure is that low and box temp at 50 what is discharge psi
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Old 07-31-2010, 02:56 PM   #4
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134A refer question


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Originally Posted by jomama View Post
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.
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Old 07-31-2010, 05:45 PM   #5
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134A refer question


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.
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Old 07-31-2010, 07:19 PM   #6
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134A refer question


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.
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Old 08-02-2010, 05:46 PM   #7
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134A refer question


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.
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Old 08-02-2010, 05:48 PM   #8
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134A refer question


LOL... pizza shop. Get the cheese and flower out of the condenser.
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Old 08-03-2010, 12:05 AM   #9
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134A refer question


he will need a jackhammer that stuff is like cement

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