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Question DetailsAsked on 6/28/2016

What is an average time to charge 6 pounds of R22 on 60,000 BTI condenser which is low on freon?

Central air conditioner, residential

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1 Answer


Depends on make/model and whether the system was empty or near empty or not, because in many makes you can inject an "initial charge" - the bulk of it - in quite a short time - 10 -15 minutes or so. Then the unit receives the remaining amount in small spurts while it is running, with some run time between each to stabilize the pressure readings, until it is up to correct operating pressures for that temperature. There are at least 4 different procedures for charging an A/C system,, depending on make/model. So, I would say something on the order of 45 minutes to an hour in most cases probably for a substantial fill - just a top-off of a pound or so of course would take less.

HOWEVER - the unit has to be at normal operating temperatures and airflow during the recharging to properly charge a system, and of course the leak has to be found and fixed, then the lines flushed with gas to clear out air and moisture, and commonly change the filter/dryer, so between cleaning the condensor and maybe evaporator, finding and fixing the leak, cleaning the system internally and refilling and then 15-20 minutes test run through at least 2 cooling cycles after it is filled plus sometimes a final adjustment to the amount of gas to get it into the proper opearating range, you could easily be talking 2 to even 3-4 hours, depending on where the leak was and how hard to find and fix. And of course this does not include any time running back to the shop or to an HVAC distributor to get any needed parts if the leak was due to a broken/faulty part.

Answered 4 years ago by LCD

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