proper a/c cold side reading

[Joshua Van Tol]

>I was curious to know what some listers are
>running as far as the pressure on their
>5000/100/200 a/c units. I mean the reading from
>the cold (low pressure) side. I've recharged
>with 44 oz's of 134 and see pressures of about
>25-30 psi. Wanted to get it to 40-45, which is
>supposed to be the high normal. My outlet temps
>do fluctuate. I go from the upper 60's in a
>standstill in 95 degree, high humidity. Once
>moving, I get down to 45-49, generally the
>higher number.  I was thinking about another 6-8
>oz's should do the trick, but wanted advice,
>first.
>
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Too much refrigerant! The correct amount of R-12 is about 1100 g,
which is about  39 oz. When retrofitting to 134, you're only supposed
to use about 80-85% as much refrigerant, which would be 936g or about
33 oz. Adding more refrigerant will not help the cooling
capabilities, and will cause increased system pressure, and faster
wear. 3 12 ounce cans of R134a should be just about perfect.
--
Joshua Van Tol -- josh at spiny.com