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Dave Platt Dave Platt is offline
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Default Identify clothes washer part?


BUT THERE'S **NO** "DIRTY" WATER IN CONTACT WITH THE FILL HOSE!! THE WATER IS
10" BELOW THE HOSE!! HOW IS THE WATER SUPPOSED TO EVEN MAKE THE TRIP UP TO
THE HOSE AND THEN TO THE MIX VALVE, ANTIGRAVITY?!


Granted that this can't occur during normal operation. But... is it
physically possible, at all, under *any* sort of fault condition, for
the dirty water to rise up as high as the opening of the fill hose?
Say, if the fill-level sensor happened to malfunction, and the
controller left the fill/mix valve open for so long that the washer
filled up to the very top of the barrel and began slopping over on the
floor... would this be high enough to allow back-suction?

My guess is that the codes are written in such a way as to require a
vacuum-breaker failsafe unless it's physically impossible for backflow
to occur, even under extremely improbable multiple-fault conditions.

A washer manufacturer might have only two alternatives to comply with
the law: either go through a bothersome, well-documented physical
analysis process to demonstrate that a vacuum breaker wasn't ever
going to be needed, or just go ahead and install one. By doing the
latter they'd eliminate any possible conflict with some jurisdiction,
somewhere, which has a code that absolutely requires a vacuum breaker
on any clothes washer.

--
Dave Platt AE6EO
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