Help needed in determining which size vacuum pump and which fittings to purchase.



A little background. I've been learning auto airconditioning and have also been trying
to learn about home a/c systems. So far, thanks to this group, I've had some success
in troubleshooting a residential system...troubleshooting electrical problems, cleaning
condensor and evaporator coils and checking amount of charge in system.



My immediate problem I have a tiny freon leak in a home system, it's enough to set off a
freon detector, but the freon charge doesn't seem to be dropping (using a standard
manifold gauge and taking measurements over several weeks). A person recommended
trying the HVAC-R sealant which seems to be exactly for this type system a Bryant
24000 R-22 system.

The instruction say to apply a vacuum to the charging hose before connecting to the low
side of the system...... I'm thinking a vacuum pump is required and don't mind picking
one up as I enjoy using tools....(never met a tool I didn't like).... and would
actually like to learn more in-depth knowledge about a/c systems both residential and
automotive.

Robinair has some 1.5 CFM double stage pumps so does Monster....... What would you
recommend for a homeowner who wants to do occasionally repairs and checks on
systems, but is NOT a professional and would only use the equipment on an occasional
basis during learning and small repairs. ??

Which fittings should be ordered with the vacuum pump to solve the immediate problem
of creating a vacuum in a charging hose for an R-22 system.

Are there any good online tutorials on using vacuum pumps for a/c repairs ??


Thanking you in advance for your assistance and knowledge !!!

Peter


(ignorance is curable