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Old 09-04-2012, 05:37 PM   #1
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Superheat Subcooling question


I know that you need to know this as a tech in order to correctly diagnose a system. I know that a fixed orifice system uses suberheat and TXV uses subcooling.

So my dumb novice question is:

Since its possible that to have either, is this a brand specific thing?

or

is this an installer decision for efficiencey?

My sons Bryant exterior label has a subcooling of 11 noted, but on the inside it has a superheat chart.



Because obviously the first thing a tech must do is determine this, correct?

Thanks


Last edited by digitalplumber; 09-04-2012 at 05:43 PM.
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Old 09-04-2012, 09:02 PM   #2
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Superheat Subcooling question


Always determine by what type of metering device it has.

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Old 09-04-2012, 10:11 PM   #3
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Superheat Subcooling question


Quote:
Originally Posted by beenthere View Post
Always determine by what type of metering device it has.

So the answer is its not brand specific and the tech must go look at the EVAP coil first.

Thanks
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Old 09-05-2012, 12:52 PM   #4
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Superheat Subcooling question


And then look at the condenser label plate to see if it specifies the subcooling for if there is a TXV in the evap coil. When I upgraded my old leaking fixed orifice coil to one with a TXV I noted that my condenser gave the subcooling spec. I think there is a rule of thumb around to set it ~10 degrees but my condenser (Carrier) specified 20. So 20 it was when I adjusted the charge.

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So the answer is its not brand specific and the tech must go look at the EVAP coil first.

Thanks
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Old 09-05-2012, 01:21 PM   #5
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Superheat Subcooling question


Thanks makes sense
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