R12 to R134 conversion question: compressor

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Jamie - 04 Aug 2006 16:10 GMT

I've read the David Urban write up and several other conversion pieces.
Here's my question: "Is draining the oil from my existing compressor
and refilling it with the new oil considered, 'replacing' my
compressor?"

Common sense tells me that replacing a compressor is getting a new or
rebuilt unit and installing it. What throws me is that if one
'replaces' the compressor they are not supposed to add oil to the new
accumulator/dryer.

Well, if I drain my compressor of the old R12 oil, am I supposed to add
oil back to the compressor?

If I add oil to the compressor, do I not add oil to the new
accumulator/dryer? Do I add oil to both?

Thanks,
JB

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User - 05 Aug 2006 03:15 GMT

> I've read the David Urban write up and several other conversion pieces.
> Here's my question: "Is draining the oil from my existing compressor
[quoted text clipped - 14 lines]
> Thanks,
> JB

Drain the mineral oil from the compressor into a measuring cup. Record
the amount; discard the old oil. Install ester oil of the measured
quantity into the compressor. Stand the compressor on its nose and
rotate it by hand several times and let it sit for a while. This is to
allow the ester oil to work its way into the front seal of the
compressor. Add the specified quantity of oil to the drier bottle.
Convert the service port fittings. Evacuate and charge the system to 80%
of the R12 capacity.

Ester oil is compatible with both mineral oil and R134a. PAG oil should
not be used in a converted system due to the incompatability of PAG oil
and mineral oil.

Bob

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