discharge superheat

[hvacplumb]

i know that superheat is heat added to a vapor if you were checking dis. s.h. would you take dis. pressure convert to temp on chart and then read actual temp of dis. line?

[freonrick]

yes you got it. same way as suction superheat

[hvacplumb]

thanks for the reply.what are the parameters of normal discharge superheat and the causes of high and low temps

[freonrick]

depends on what type of compressor. for an example a trane rtha will run low 20's at full load. carrier gx will go for 22 degrees at any load. on recips i like the discharge temp not to be any higher than 200 degrees when fully loaded. always check the manufactor specs on the machine.

[jhawk]

I think for R-22 A/C a discharge superheat between 50 and 90 DEGF is normal. If it's lower than that, you're probably flooding back. If higher then low on charge, or restriction, etc.