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Question DetailsAsked on 10/29/2014

how do I get a good flush on the indoor coil is a 410 a unit I know r22 was introduced

2&a half ton indoor unit 2 ton outdoor unit upgrading to an 2 &half ton want to reuse indoor unit

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4 Answers


You obviously don't have any clue what you are talking about..please don't do anything. Stand back and call a professional.

Answered 5 years ago by DonChepe


As I read your question, your unit had an R410a rated unit installed on an R22 system - presumably as a replacement for a defective one.

Some manufacturers whose R22 units can handle R410A and vice-versa make in-situ flush kits, but usually the evaporator would be hot tanked - cleaned in a hot tank like a radiator, then live steam cleaned - rarely done in residential units but not uncommon for commercial units where the $200 or so hot-tanking charge can be a very small percentage of an evaporator replacement cost.

Orif unit is a R410a unit but was improperly charged with R22, coolant gas manufacturers make flush kits for that - which is important, because not only the gas is different but the lubricating/corrosion inhibitor oil that teh gas carries with it is different too.

Your Heating/ AC contractor should be able to get this done if the evaporator is a suitable match for the new compressor/condensor unit, which is important because if it is not then the pressure drop across it or the heat removal capaqcity may not be compatible with the new unit and cause the unit to work excessively hard or not produce the cooling it should.

Answered 5 years ago by LCD


perhaps I was not cleara friend would like me to replace is outside condenser it is a 410 a is inside unit is also a 410 a inside unit of the two and a half ton air handler the outside unit is a two time I will be replacing it was a two and a half ton condenser my question is since someone introduced r22 to this for 10 a system with a flush kit clear the inside coil well enough to just install the new condenser also it should be noted this is a heat pump well I have to replace the reversing well where can I take a magnet put it in the cooling position and flushed a second time

Answered 5 years ago by lakehillmanager


Since federal law requires a certified HVAC person handle any discharging/recharging of R22, you should just let the contractor handle it all. Not really a DIY thing because the evaporator unit has to have the right design to match to the heat pump (especially more critical with a heat pump than an air compressor, because it has to work in both directions, plus in at least some makes runs at a significantly higher compressed gas pressure). How well the unit has to be flushed depends on the gas used in it - some use mineral oils, some ester oils, some synthetics - some of which clean out pretty well, some do not - and the wrong oil in any quantity or the wrong cleaning method could damage the lining in the evaporator (some have a teflon or metallized lining, especially if aluminum),the compressor, or the controller valves - so best left to the experts.

Answered 5 years ago by LCD

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