Sean, I do not have questions. 6/10 is a passing score for someone who did
not take the refrigeration course ? The book I was quoting was Anthony J.
Caristi "Practical Airconditioning Equipment Repair" from McGraw-Hill.

What you affectionately call bomb charging is what he says is the best
way, after using a vacuum pump on the unit. From what else I read he is
probably right. If charging by weight using a vacuum first is called bomb
charging then what is the proper name for charging by ear/experience ?
Blast charging ? ;-)

The plumbing for split a/c units is copper tubing usually 1/3" and
sometimes 1/2" with external neoprene insulation. Still at 15at working
pressure those things look dangerous to me.

I do not know what the local policy on R12 is. I would not be surprised if
it is still being used on old equipment.

I have used refrigeration compressors as vacuum pumps (rough vacuum). Two
in series should get you to 1x10^-3 after a while.

Peter

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