Quote Originally Posted by frank
I disagree Richard

If you had your gauges connected and you read a pressure then you would still have to do a temp/pressure conversion to get the overall picture. Don't forget that we are trying to control temps. How do you determine superheat? - temp/ pressure relationship. How do you determine sub-cool? - temp/pressure relationship.

It's no good approaching an R22 system on an A/|C application and saying " I'm looking for a back pressure of 55psig" you need to now what temps you are getting on the system.

Temps alone don't give the overall picture but they do give a better insight of how thesystem is working against how it should against just looking at the pressures.

If you had a system on A/C on R22 with a gauge pressure of 55psig - what does that mean? Unless you do a press/temp relationship comparison then it doesn't mean anything.

Point made?


err point not made at all

i said you cannot work from temperature alone, you agree then tell me you disagree whilst going on about temp/pressure..

what is your point exactly??


cheers

richard