Your use of SH on sytems with TXVs???

[pecker head]

If its TXV then set the charge using subcooling. Monitor the superheat to evaluate for proper operation. Under normal conditions a proper operating system would run 8-15 superheat... however some txvs are adjustable. You need to monitor both to know what's going on.


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[toyo066]

when using 410a it is the only way to go. if you are short on just one pound of Puron you could lose up to 4 degrees cooling. The only way to get it right is your SC and SH if your having an issue with it try purchasing an sman 3 they work great. R22 is a forgiving gas Puron is not.

[Russ57]

Hard and fast rules are what gets begineers in trouble.

It is easy to say "charge by SC with a TXV and charge by SH with an orifice". However such rules assume the TXV or orifice and working as intended.

The info we should gather for a complete picture matters little betwen refrig/AC, TXV/orifce, etc. SC, SH, TD/CFM across coils, approaches, current draws, voltages, suction and discharge saturation temps.....all must be considered in a holistic approach.

Assuming a bunch of things must be right when a system is clearly acting wrong is a mistake to be avoided. Sometimes the wrong part gets installed at the factory. And if it is an older unit, God only knows what someone else has done before.