DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (http://www.diychatroom.com/)
-   HVAC (http://www.diychatroom.com/f17/)
-   -   Superheat Subcooling question (http://www.diychatroom.com/f17/superheat-subcooling-question-155848/)

digitalplumber 09-04-2012 04:37 PM

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

beenthere 09-04-2012 08:02 PM

Always determine by what type of metering device it has.

digitalplumber 09-04-2012 09:11 PM

Quote:

Originally Posted by beenthere (Post 1003348)
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

raylo32 09-05-2012 11:52 AM

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.

Quote:

Originally Posted by digitalplumber (Post 1003433)
So the answer is its not brand specific and the tech must go look at the EVAP coil first.

Thanks


digitalplumber 09-05-2012 12:21 PM

Thanks makes sense


All times are GMT -5. The time now is 06:40 PM.


Copyright 2003-2014 Escalate Media LP. All Rights Reserved