Vapour method ( upright bottle )
After you have vacuumed down the system and ensured its free of contaminants and moisture and leaks ( by allowing for enough vacuum time )
You gauges will still be attached to the low pressure line from vacuum down.
Attach the bottle of gas to the vacuum fill hose of the manifold gauge and ensure the gauges are zeroed
open the bottle this will fill the hose , undo hose connection and purge the air form the hose so you do not put any air into the system.
You now need to open the tap to allow refrigerant into the low pressure side of the system, allow in a few grams of refrigerant and turn on the compressor. This will allow the compressor to draw in the refrigerant and circulate the vapour. Using your scales now add the exact amount needed to refill the system.
to finish shut of bottle valve and allow compressor to draw in refrigerant left inside the hose, once this is done turn off the valve to disconnect system from the manifold gauges.
Low side pressure on a healthy system is usually between 0.1 and 0.6 bar.
An excellent video refilling with liquid refilling upside down bottle.
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