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Old 07-03-2011, 05:09 PM   #1
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Charging with R410A

Our techs have been having a lot of service calls with new unit overcharged. Many of these units were started in spring with temps below 75 degrees.,which was never a problem with R22.
Units get very noisy,and customers call. Also it seems just a half pound charge sends gauges out of site.,more finicky! Any thought appreciated.


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Old 07-03-2011, 06:12 PM   #2
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Charging with R410A

So, what is your problem again?


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Old 07-03-2011, 07:20 PM   #3
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Charging with R410A

Follow the superheat or subcooling chart that comes with the unit and warm the house up to 70-75 and you should not have a problem. Can safely and accurately charge a system down to 65 deg F OAT. They probably kept adding gas to try get the pressures up when it was cold thinking it was undercharged and now you can have 1/2 to 1 lb or more overcharge. Beer can cold suction line method does not work with R410 units or any over 10 SEER
"Cut it twice and it is still too short".

Last edited by yuri; 07-03-2011 at 07:34 PM.
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