Question about Whirlwind FH-778 Air Conditioner

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I have a Carrier 4 ton unit model number 661CJ048-A which is charged with R-22 capacity is 9,25lbs. It has developed a leak at the evaporator coil. It has rust on the coils which from what I understand means the leak is there. Now currently it has only 3.25 lbs of R-22 left in it. I want to replaced the coil, but until I do I want to replace the R22 with R-134A, and be able to use the AC unit, until I can afford to puchase the coil, which I found one for $720 from a company in Florida. Do I need to empty the R-22 before recharging with the R-134A. Or can I mix the 2 of them together. Since I have ordered the R-134A and it contains 30lbs I figure I have enough to re-fill the system twice. The final question is the High Line & Low Line, the High Line is the smaller of the 2 lines? I am not a HVAC trained tech, But I am an Engineer who spent 20 years as a field engineer supporting many devices. I do know how to soldier and rebuild equipment. Not to mention I understand the fact that you don't soldier with any Freon in the system. I am in the Dallas area, and the reason I am going through all of this I was laid off back in December and can't afford the rates from a HVAC tech.

Posted by frank_verea on

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  • Ken Bledsoe May 11, 2010

    What you are talking about would cost you more in the long run then just the A coil. R134a uses a different oil. So you could ruin the compressor. I would highly recommend not doing it. Might have to buy a used window unit to get you by and 720 for a coil is that installed by a tech? If you can located the leak in the a coil have it brazed and recharged. If you can see the leak area. Would be alot easier. just my feeling towards your problem. Ken here in Kansas

  • ed rodgers Aug 06, 2013

    bullsh*t haha r134a wont carry the oil but there will be enough r22 to do the job and it will increase pressure to about -31 making system more efficient .. ive mixed them for years then refitted and recharged with no damage at all to system ..only a/c tech will tell you no ... uh, go figure

  • ed rodgers Aug 06, 2013

    i ran a central a/c unit half and half for over 4 years no problemo ... lol gas is gas people only the oil changes and the boiling points ... as long as theres still enough r22 to carry the oil what damage will be done to compressor ??? duh ever watched a tech ad oil ? it aint exact science

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First your system is 22 and 134A is a auto AC refrigerant. I have never seen it used in residential ac. I have been in AC business for 45 years. The new refrigerant is 410A or Puron. But you can not use it. Your outside unit is set up for 22. Mix 134A with the oil used in a 22 system is not done. You need to get the correct coil for your system. They are going to make 22 for years. They now have a Drop in for 22 called NU22. I know times are tough but you may have to get a Service Tech anyway.

Posted on Jun 09, 2009

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Anonymous

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SOURCE: R-22 vs R-134A

not a good idea to swap gas coz need to change tx valve and flush system and use polyester oil,cost a lot. ur best options is to repair, pretty sure it can be soldered

Posted on Jun 09, 2009

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