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Posted by Harry K on June 26, 2008, 10:02 am
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> >> > While examining the AC condensate drain, I noticed that the pipe
> >> > coming from the pressure relief valve on the hot water heater joins
> >> > it. (Actually, it _used_ to join it; now that joint is completely
> >> > loose.) The condensate drain pipe then travels another couple feet
> >> > and drains into the pipe for the clothes washer drain. Is that a
> >> > good idea? Somehow I don't think so.
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> >> No, it is not a good idea. The pipe on the pressure relief valve
> >> should be a single straight piece terminating about 6"-12" above the
> >> floor. Most plumbing codes do not allow additional fittings on it or
> >> piping it to a drain. If the valve operates, you want to be aware of
> >> it, as it is a sign of a problem.
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> >> Cheers, Wayne
> > I'd like to see _that_ code specification. =A0The 6" bit is correct as =
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> > non-siphon termination is required, =A0but it is recommended that all
> > PRV's terminated in a safe drain, not on the floor. =A0If you hear
> > spashing on the floor you have two problems, what caused the valve to
> > operate and what damage is all that water on the floor going to cause.
> > Harry K
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> Is there any technical sense to the term _safe_ drain?
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> I don't see a floor drain in that part of the basement. =A0How likely is =
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> that a PRV is going to operate and let out tons of water?- Hide quoted te=
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> - Show quoted text -
It happens. They do stick open but the most common is a failure to
close all the way with a constant leak until replaced. Mostly it is
just a drip rather than a stream.
As for your installation: I can't see one being terminated in the AC
drain line. The only ones I have seen are small diameter tubing that
is not rated for hot water.
Harry K
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