Doug,
Have you tried cleaning the condenser coils? I have a Sub Zero also and
that has been the main reason for poor cooling. I also once had the
problem of the defrost timer not working, which caused the compressors
to not turn on at all, but if you are getting cooling at all, that would
not be the problem.
It seems to me that just having shut off valves on the schraeder valve
would not keep all the freon in the system because some of it will fill
the hose(s), especially when you bleed them to get the air out. Any
freon that makes it past the valve will be lost to the system, so you
might want to add some back in, even if the gauges show a proper charge
on the system.
As for the escaping freon when disconnecting the hoses, I just press the
hose into contact with the schraeder valve and unscrew the hose nut.
When it is loose, I lift the hose off the fitting and the schraeder
valve seals right away. The only thing that vents is the freon in the hose.
Good luck.
Peace,
Pat
Thusly spake Doug Braun, On 1/8/2009 8:38 AM:
> Hello,
>
> Here's another freon-related question:
>
> My house has a 25-year-old built-in Sub-Zero refrigerator that is cooling
> poorly. Unfortunately Sub-Zero service people charge a lot, and new units are
> breathtakingly overpriced. Each of the refrigerator and freezer compressors
> has the standard high and low side Schraeder-style fittings (like tire valve
> stems, but a bit bigger). I have a manifold gauge set that would attach to
> these, but during the process of attaching or removing the hoses, a lot of
> freon leaks out of the connections.
>
> So how can I work around this problem? The gauge set came with adapters that
> attach to modern car R-134A ports, and have knobs that open the internal
> valves after the adapters have been securely attached to the ports.
>
> Are there equivalent adapters that attach to the older-style Schraeder
> fittings?
> Or do A/C techs simply attach and detach the hoses quickly and not worry about
> the freon that leaks out in the process?
>
> Any advice would be very welcome. I do not want to have to pay somebody
> several hundred dollars per year to keep the refrigerator going, and I really
> do not want to pay $6000+ for a new one. Every refrigerator sold in the size
> I need (24x48") is just as expensive.
>
> Doug
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Pat Horne 512.797.7501
Owner, Horne Systems pat@hornesystemstx.com
5026 FM 2001 Lockhart, TX 78644-4443
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