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21-05-2005, 07:02 PM #1
How to calculate gas top up (R22)
I have bought a Fujitsu Air Conditioner (AOY17ANA outdoor unit and ASY17ASH indoor wall unit) which I have successfully install in our bedroom. The unit was pumped down and removed some years age by a professional engineer.
I have vaced it down and did a test run and it seams to work OK! but I don't know how much gas is in the unit. I have calculated that it needs 1390grams of R22, but how do I calculate how much extra to put in, is there an easy way to do this ie; from the temperature and pressure at the charging port? or is it more complicated that this? (I am sure it is!)
I am a heating engineer by trade, and want to venture into aircon soon but I want to get this sorded asap.
I was told the best way is to dump the gas and start from scratch, but I think that this method leaves much to be desired and I don't have a recovery unit. Any Help would be useful
Regards Danny
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