RE: [alfa] A/C charging

["Jeff Greenfield" <alfaguy@xxxxxxxxxx>]

Usually when charging a system, after the vacuum is drawn (including the
line between the gauges and the tank) you open the valve on the tank, turn
the tank upside down open the valves on the gauges (engine off) until the
pressure equalizes.

Close the valves on the manifold, start the engine, turn the A/C on. At this
point there should be enough of a charge to get the compressor going, if
not, you need to bypass the low side switch.

Then open the low side (never the high side) valve, and the charge will be
drawn in by the system.

Usually, the amount of charge introduced into the system is measured by
weight, this way you know when the proper amount has been added to the
system. Never overcharge, too much is a very bad thing.

HTH,

Jeff

-----Original Message-----
From: owner-alfa@domain.elided [mailto:owner-alfa@domain.elided] On Behalf Of
Daegrigg (Don)
Sent: Tuesday, November 18, 2003 7:03 AM
To: alfa@domain.elided
Subject: [alfa] A/C charging

I am charging the a/c on the 164L after r/r the fan and heater core.  I drew
a
vacuum on the system for 30 minutes and then put in 8 oz of oil (ester) 20
percent r134 combo.  Ambient is about 60 degrees.

The compressor is not kicking in and my question is whether this is due to
low
system pressure.  The manual says that the trinary switch will not kick in
the
compressor below 29 psi.  (My low side gauge is reading 50 psi but that
can't
be system pressure with just the 8 oz oil charge.  Suspect this is just the
pressure out of the can.)

Checked the other electrical connections (that I know of).

Must the compressor be running to take the main charge?  If so, how do I get
it to run below the 29 psi trip point.

Thanks,

Don
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