TXV Valve

[Dxrocaa4]

Hi guys! I'm a HVAC newby----Every now & then I run in to a unit where I can't tell if it has a fixed metering device or a TXV valve---What's the quickest & best way tp determine if the unit is fixed metering or TXV---I was trained to charge either on sub-cool for TXV-----or superheat for Fixed metering device----But this HVAC pro at work said he charges everything TXV & fixed metering via superheat----he said superheat is more efficient-----So what's the truth *
Dxrocaa4New Contributor - - Fri Apr 06, 2012 - pm

[Dxrocaa4]

On a unit with a reversing valve do you hook up gauges the usual way----red/hi----blue /lo----or do you hook up one of the gauges to the third valve coming from the reversing *

[heatseeker]

Third valve coming from the reversing vlv.****** Yikes-- Must charge by subcooling with txv. Hello is there anybody *