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Re: A/C recharge questions
> Date: Thu, 8 Sep 94 07:19:55 -0400
> From: "Barton P. Chambers" <firstname.lastname@example.org>
> Reply-To: email@example.com
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> Hi Vladimir,
> > Why the Bentley recommends to evacuate system before recharging?
> This procedure applies to *all* conventional air conditioner systems using
> refrigerant under vacuum. If you wish to successfully charge one of these
> systems, it is *absolutely* essential to pump out the remaining refrigerant
> under vacuum, or you *will* get air in your system, and lose the ability
> to cool.
What do you mean by "refrigerant under vacuum"? Conventional (R-12, R134A)
A/C:s are under pressure when correctly charged.
Unless you have a leak and the whole charge has vanished it is
possible to recharge without evacuating the remainder. If there is a
leak and air (= moisture) has gotten into the system the moisture must
be evacuated, after fixing the leak of course, as R-12 reacts with
water into some acid.
One reason I can see to evacuate the system is to know exactly how
much refrigerant you have in the system.