Superheat

[craner7]

Somewhere in the far reaches of my overloaded mind I used to remember what superheat settings to look for on freezers, coolers, AC units....anyone help me to recover my memory?! For some reason 7 to 10 deg on AC and coolers rings a bell...is the bell ringing right?

[jackmm1]

Superheat is factory set at approx 10F(spring tension) and the TXV/TEV should work properly if no field adj have been made. If you want to check superheat try this.
Example R-12 walk in box. Gauges read 37# = 40F evap. place an accurate thermmonter near the feeler bulb. Let say it reads 50F....
+50F
-40F
----
=10F superheat.

Note: Tech's in the field that change the factory set superheat settings just create more problems for himself or the next tech.

[rocket]

for many years the common Superheat rule has been
high temp 8 to 12
med temp 5 to 8
low temp 2 to 5
this is probably what you are refering to and is
highlighted in Copeland's COSS seminars

these are safe but if possible, get equip mfrs recommendation

[craner7]

Thanks guys, that brings back my memory, it hasn't gone completely....I knew I was in the ballpark

[coolprod]

Originally posted by rocket
for many years the common Superheat rule has been
high temp 8 to 12
med temp 5 to 8
low temp 2 to 5
this is probably what you are refering to and is
highlighted in Copeland's COSS seminars

these are safe but if possible, get equip mfrs recommendation

addition: 3 to 6 low temp cap tube
20* A/C