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Question DetailsAsked on 6/26/2014

I added some dye (EFProducts Ester 100) for R134A into my home HVAC system (RF22).

Last year, I added some dye (EFProducts Ester 100 from AutoZone) for R134A into my home HVAC system (R22).
What are the ingrediants inside this?
Afterwards, I found out that one should not mix them. Should I drain my system and clean the tubing? I have heard that the mix of oils form acids which eat the pipes? Is this true? What are the side effects.
Has anyone else done this and what have you done to fix it?

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1 Answer


Ouch - esters are not compatible AT ALL with the mineral oil which is normally used with R-22, or the polyester oils normally used with R-410a. I have seen filter/dryer canisters and tubing crammed full of gooey sludge froim mixing the two - which would mean your system would be operating inefficiently and the compressor may well not be getting the right kind of lubrication.

Also, most new systems run hotter than old ones, so the new snythetic oils are needed to provide the right friction protection, which the Ester 100 may well not do.

I have read some blogs about corrosion from ester oils - both alone and mixed - in HVAC systems - they evidently tend to bind water and therefore hold it in contact with the tubing.

I would have the system blown out and then properly flushed, with the flushing fluid recommended by the system manufacturer (eMail them and tell them the situation and ask for their recommendation to remove both the OEM oiland the ester product), then refill with new (NOT reclaimed) gas - and I would also recommend knocking off the DIY HVAC work, which as you can see is not good for it and is also illegal (because you presumably do not have a refrigerant recovery system, and probably are not EPA licensed to buy/install refrigerrant gases) if not licensed for it.

Answered 2 years ago by LCD

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