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Comments for
How to determine the amount of refrigerant needed

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Jun 14, 2010
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starstarstarstarstar		 how to determne the amount of refrigerant needed
by: jogendra sitlani

I wan to know the perfect calculation for the how much amount of refrigerant require in the system.
Mar 17, 2010
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starstarstarstarstar		 I'm not sure I understand the Title???
by: Dadan

I'll presume you talking about central air conditioner units.

After complete installation, the central air conditioner units usually need five pounds of refrigerant.

It should be in the condenser name plate. It should said, "Factory charge 5 lbs."

How does technicians calculate how much refrigerant does a system need?

We use factory charts or by Subcooling and superheating. Or we use the calculation slide card.

The calculation slide card had two sides. The front side has the Title "Required Superheat calculator (cooling, Non - TXV)" and the back side has subcooling calculator (cooling, TXV). This is for R-22 only. You'll need different slide card for R 410A.

There are tools you need and information. You might as well buy air conditioner books. It probably takes me three or four pages tell you.

Why learn useless information?

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