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Question DetailsAsked on 7/5/2017

Can you replace a travel trailer A/C unit that had 410A freon and use 134A after drawing the 410 A out of the syst

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Why ? Even if it worked, it would not behave the way the system is designed to work, so your operating efficiency would be off - and the lubricants (which is in the gas and circultes with it) are likely not compatible either, so your compressor lubrication would likely be reduced. Mixing incompatible lubricants can also cause gumming up or buring in the lines.

Not to mention it is illegal to use a different gas than one rated for that use in an A/C system or heat pump - R-134A is an automotive air conditioner gas, R-410A is a space cooling (building and RV) gas so your system is not designed to run with it.

I would guess you are trying to get around needing to have to go to an HVAC pro to add gas to your system (if that is even what it needs) by using the small refill cans available for automotive systems - but I would not do it, not only for the reason stated above but how in the world (unless you own an expensive A/C gauge set) are you going to come anywhere near to the right amount of gas to achieve the right operating pressure for the system - even if the different gas had similar thermodynamic properties, which they do not. For instance, just taking a random operating chart forthe two gases (obviously not for the same sysstem), at 100 degrees F ambient R-134A shows 315-325 psi as a sample head pressure, whereas R-410a shows 375-400 as a common operating pressure - so running one at the pressure for the other would result in signfiicantly different cooling performance, even with lubrication and health of the system aside.

Answered 3 years ago by LCD

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