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What should the superheat be - Ruud UAMB042 Air Conditioner

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12-15 degrees.

Posted on Jun 03, 2010

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What range should your super heat be on txv ?


I normally don't take a superheat reading when I have a txv. That can fool you. A sub cooling reading is the best when a txv has been installed. I've seen normal temp readings of 0° superheat and 16-20° sub cooling with "factory specs". And that was normal! That valve will open and close changing superheat values. Sub cooling is the way to go! Find some manufacturer specs if possible.

May 27, 2015 | Heating & Cooling

1 Answer

What range should your super heat be on the txv ?


I normally don't take a superheat reading when I have a txv. That can fool you. A sub cooling reading is the best when a txv has been installed. I've seen normal temp readings of 0° superheat and 16-20° sub cooling with "factory specs". And that was normal! That valve will open and close changing superheat values. Sub cooling is the way to go! Find some manufacturer specs if possible.

May 27, 2015 | Heating & Cooling

1 Answer

I HAVE A westinghouse a/c system in my home,one compresser for the main home an another for the up stairs.A REPAIR MAN COME TO THE HOMEM,CHECKED THE SYSTEM AND SAID I NEEDED MORE FREEON.HE ADDED SOME...




When technicians take an air conditioning course, one of the first things they learn is to use superheat to charge a fixed orifice air conditioning system.

Superheat is not hard to deal with, but the technician needs to take four good measurements.

To get the actual superheat, the technician measures suction line pressure and suction line temperature. When he reads suction line pressure, he reads the *F scale on his gauge. That's the boiling point of that refrigerant at that pressure. To get actual superheat, subtract the suction line boiling point temperature from the measured temperature of the suction line.

To read get the required superheat from the most common A/C manufacturer's superheat charts, the technician measures indoor "wet bulb" temperature and outdoor air temperature ("dry bulb"). Using these two temperatures the technician can look up the required superheat on most A/C manufacturers' superheat charts. Required superheat's can vary from 5 *F to over 45*F depending on the conditions (indoor wet bulb and out door dry bulb). The higher the load, the higher the required superheat.
The technician adds or subtracts refrigerant to decrease or increase the actual superheat to match the required superheat.

Superheat is the temperature difference between the boiling point of the refrigerant in the evaporator and the actual temperature of the refrigerant gas after the evaporator. It is the "extra" temperature (or temperature rise) the refrigerant picks up in the evaporator after it boils.

When charging the system, the technician adds as much refrigerant as he can. But if he adds too much (overcharge), he risks flooding the compressor with liquid refrigerant.

The biggest risk of flooding is under low load conditions: low outside temperatures and low indoor wet bulb temperatures. The refrigerant boils off late in the evaporator. To make sure the refrigerant is all boiled off before the end of the evaporator, the the A/C manufacturer's required superheat chart directs the technician to stop adding refrigerant when the suction line temperature gets down to within a few degrees of the boiling point inside the evaporator. The "few degrees" is the superheat. At low load conditions, the superheat is often specified as five or six degrees. It's a safety factor to make sure no liquid gets to the compressor.

At other load conditions, as determined by outdoor air and indoor wet bulb temperatures, the required superheat is given by a the superheat chart supplied by the A/C manufacturer. The higher the temperatures, the higher the load and the higher the required superheat.

Doing a superheat analysis is the best way to insure that an air conditioner has the proper charge.

Jun 13, 2011 | Refrigerators

1 Answer

Charging chart missing. Goodman 4-ton AC (model CK 49-18) R-22 fixed orifice


Hello, in order to find if the sytem is operating correvtly you should measure the outdoor dry bulb temp and indoor wet bulb temps, this will givenyou a target superheat. Pressures will vary always use superheat. If superheat is higher than target add refrigerant if it is lower remove refrigerant.

Jun 08, 2011 | Heating & Cooling

1 Answer

How to get super heat


To get super heat you need to check the temperature of the evaporator where the refrigerant is exiting. It will travel to the compressor once it has absorbed heat from the indoor air flowing over it. The refrigerant R-22 will change states from a liquid to a vapor gas at 40 degrees. the air in the house is drawn across this indor coil filled with 40 degree refrigerant and it will start to absorb heat from that air. Super heat is considered to be any heat gain in the refrigerant after the change of state from a liquid to a vapor. SO.....at 40degrees at the evaporator coil where the refrigerant exits the coils all the way to where the tubeing enters the compressor where the temp is maybe 55degrees. This is Superheat and it would be called 15 degrees of superheat. That is how much heat was gained in the refrigerant after it had flashed to a vapor in the evaporator and then passed through the suction line which enters the compressor. Remember the one constant....R-22 boils at 40 degrees and changes from a liquid to a vapor! No matter what this happens so any temp gained over 40 is considered superheat! 10 to 13 degrees of superheat is considered optimal on most units. Hope this helped in understanding how superheat works!

Oct 08, 2010 | GE Heating & Cooling

1 Answer

Gneed superheat ratings for mm# .s .sc


superheat is determined by outside temp and inside temp. Usually the superheat will be 15-25 degrees to get good cooling back to the compressor.

Aug 19, 2010 | Goodman CKL24AR24 Air Conditioner

1 Answer

Superheat Problem


Superheat is the dif. between suction temp on the gauge and temp on the suction line. Make sure you are measuring the right line/ Normal superheat is between 10 to 14 degrees depending on line length. Russ

Aug 15, 2009 | Heating & Cooling

2 Answers

How panasonic charging by superheat


Not exactly sure of the question. You can charge any aircon by touch alone, just by feeling the return or suction side tube temperature. But generally you could also work on a 60psi backpressure.

Mar 19, 2009 | GE Quiet-Aire Ductless Split System Air...

1 Answer

How to charge coleman mach-3 a/c roof unit 134 or 22


If it needs a charge the leak has to be found and fixed. If the leak has been fixed and you have a service valve on the low side. It should have a vacuum pulled on the system to remove all air and non-condensable gases from the system. Then you can charge the system : 1. by weight according to the name plate. 2. charge by superheat (temperature leaving the evaporator + 16°F) When using the superheat method to charge the higher the Ambient temperature the lower the superheat difference will be.

May 01, 2008 | Heating & Cooling

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