Thanks for the post, eventhough I did not learn anything from it. In fact you got me confused. Are you saying to measure Subcoling at the Evap. coil ?
both usually taken at o.d.u. service valves
Tell me, on Salad cooler (at 40 F)running on R12, what would be the Superheat (yes, it is using TXV) ?
it should be controlled by txv and at manafacturers spec
a txv is usually pre set dont mess with it unless you are "real good"
Also, when switching from R12 to R409 - how do you adjust that "gizmo" as you call the TXV ?
probably with different refrigerant you would change valves unless the properties of the refrigerants are nearly the same and i doubt they are
Is the Superheat meaningfull on a fixed metering device, if so , then what is the proper Superheat on a domestic fridge ?
most are designed to operate in room temps of about 70 degrees with captubes and superheat will vary with box temp(load)
hope i cleared up some of your confusion
[Edited by resolutetech on 04-07-2005 at 07:00 AM]