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Thread: no superheat, no subcooling
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09-02-2011, 05:10 PM #27
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You don't understand what taking a subcooling reading tells you?
Originally Posted by 02powerstroke
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09-02-2011, 05:11 PM #28
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Yes I do, but I'm driving so I am going to have to do this after bit
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09-02-2011, 05:17 PM #29
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Drop the phone and hold onto the wheel! Originally Posted by 02powerstroke
Catch you later if I can.
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09-02-2011, 05:33 PM #30
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greater subcooling means that you you are below the saturation temp by so many degrees... waht this means is that the refrigerant can absorb more energy before it starts to evaporate... If you have more refrigerant, more subcooling and the same load, you will have less refrigerant turning to a vapor (vaporization) so your vapor pressure will be lower on the suction side of teh compressor... all it means is that you are getting more cooling out of your refrigerant...
Am I missing something without going into enthalpys?
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09-02-2011, 05:35 PM #31
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? hmmmm?? design pressures on manufacture label?/? = test pressure, not operating design.
now if we are talking design pressures for operating temps and pressures and they are that high, you have the wrong refrigerant.It's hard to stop a Trane. but I have made one helluva living keeping them going.
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09-02-2011, 05:37 PM #32
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You're overthinking. Originally Posted by 02powerstroke
In simple terms, if you measure subcooling, what do you know?
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09-02-2011, 06:26 PM #33
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Your refrigerant is a liquid
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09-02-2011, 06:55 PM #34
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It gives you an idea of how much liquid is in the condenser coil. If you had a restriction in the evap area, you might accumulate more refrigerant on the condenser Originally Posted by 02powerstroke
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09-02-2011, 07:02 PM #35
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thank you... that makes sense Originally Posted by ChaseAir
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09-02-2011, 08:28 PM #36
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ok... I went back and tested it one more time.. here is what I ended up with
Suction Line Temperature ~ 60F
Suction Pressure - 83 PSI
Liquid Line Temp - 96F
Discharge Pressure 202psi
Refrigerant - R22
THe model of the condensing unit is a 38CKC042
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09-02-2011, 08:36 PM #37
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11 superheat. 6 subcool. It would help to know indoor wb db and delta t.
You have low subcool for sure. If it is a txv metering device, it is most likely undercharged. If it is a piston, you either have low airflow or too big of a piston.
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09-02-2011, 08:48 PM #38
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Indoor temp is 78F, will have to measure wet bulb. The consensing unit is a piston unit. This is an original split on a ranch that had the basement finished recently.
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09-02-2011, 08:51 PM #39
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Exactly. Originally Posted by 02powerstroke
And what part of the system needs liquid to operate correctly?
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