134a cooler - http://www.hvacmechanic.com/ Forums
Original message
| raul v
 |  "134a cooler"
, posted Fri 5 Sep 17:48  
I have a cooler that is not working as well the deli meats are at a 60d temp when it should be 35d to 41d the the temperature dial is set at high. The pressure are low 30 hi 325 the suction line is icing up. I already recover the refrigerant, vacuum and charge it. The condenser is clean. Also the unit condenser said that the ambient temperature should be no less then 86 d the ambient temperature is 87d would this be the source of the problem the other cooler is also icing up the suction side.
please can you sudgest where i can get a cheap set of 134a gauges i been looking around here ant they cost 120.00$.
I appreciate all the help you can provide.
Thankyou
Raul
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Replies:
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| Jojo98
| "Re(1):134a cooler" , posted Fri 5 Sep 18:29
First, the head pressure is exceptionally high. 86 deg temp, you should see approx. 155psi. I would look into a restricton in the liquid line, or a malfunctioning metering device.
If your manifold guages work properly and you have new hoses ( Mineral and POE ) then go to the Parts House and get a free PT Chart
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| | raul v
| "Re(2):134a cooler" , posted Fri 5 Sep 23:59
thankyou Jojo for your input. This system does not have a filter dryer do you recomend i install one. Jojo yes i have new gauge set but is for r22, can i use it for r134a are the pressure the same and what do you mean by mineral and poe.
I appreciate all the help you can provide.
Thankyou
Raul
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| | 341
| "Re(3):134a cooler" , posted Mon 8 Sep 16:17
I have a set if R22 guages that have a 134a scale on them.
I only have experience with residential air conditioning though, but I know R22 uses mineral oil and 410a systems use POE oil. I don't like using the same hoses for both gases, as the mineral and POE aren't miscibile. It would be like putting a non condensible into the system.
You could probably be able to buy new guages and put them on your existing manifold. I know yellow jacket sells them seperately.
www.hvactechgroup.com
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