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Piston Swap on the fly?

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1.7K views 9 replies 7 participants last post by  GooseBone  
G
#1 ·
Hi all, I have a feeling I may have to change a piston for a 4 ton Rheem (the nice new ones). Customer just wanted existing condensor relocated and I just peeked inside of piston compression nut and notice it was a .070-something. I'm used to seeing .082 for 4 tons (for Lennox anyway) Also noticed hi head pressure (340psi on an 80* day) Got superheat on point
So... I know the answer is probably no, but if I pumped condensor down and left 5-10 psi in the lines then would I be able to swap it on the fly? (To avoid half /hour vacuum time) Or would the POE oil suck in moisture? Anyone try it with success? Or just stick with a good ol'vacuum?
Gonna double check piston size with supply house tomorrow.
 
H
#3 ·
Ive done that for swapping schraeder cores, but I doubt you would have enough time for the piston, cause you need to oil or nylog the seats, and pulling the old piston may take a few minutes.

I would plan on pulling a vac, but you could try it and see. Just be ready to pull the vac.


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C
#9 ·
Before you even try it ide call a distributor and see the outdoor unit actually takes. Different brands use slightly different sizes. Depending on the efficiency of the unit 340 might not be so far out of line. High indoor load can raise it some too as stated and 4-5 ton units will typically run a higher head pressure than the same smaller unit.


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