Roger Sisler wrote:

>Acutally, 1/20 a drop is for a capilary(sp) system., like a house portable
>dehumidifier. A system with a reciever/dryer  should not have much
>circulating moisture. Maybe a  uncaptured drop of moisture will shut it
>down. It will combine with r12 to make phosgene gas.
>
> When charging a system, or just topping off with a refrigerant, purge your
>hoses first. The air inside has moisture in it and it will be injected into
>the a/c ststem.
>
>
>
I assume the hoses you refer to are the ones on your gauge set.

Larry A.