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Newsgroups: sci.electronics.design
From: bloggs.fredbloggs.f...@gmail.com
Date: Sat, 6 Oct 2012 05:02:29 -0700 (PDT)
Local: Sat, Oct 6 2012 8:02 am
Subject: Re: arc suppressor for relays
On Wednesday, October 3, 2012 3:23:31 PM UTC-4, Jon Elson wrote:
A "bank" of valves and relays? Usually there are just two, one for cold water and one for hot water, not anything complex. You may actually reduce contact life with the addition of arc suppression. The relay contact materials and operating characteristics such as contact pressure, overtravel, and release geometry have been optimized for the weakly inductive solenoid valve type of loading and any modification will most likely reduce contact life. The solenoid loading should only be a few milliamps.
> We have one of those $1K high efficiency washing machines. It does work, and > clearly reduced our water and gas bill, so I'm not complaining.
> Lately, it has been getting "slow fill" errors, and I tried a bunch
> of typical stuff before finding the REAL problem. They have a bank
> of electromechanical relays to operate a bank of solenoid water valves.
> There is no arc suppression on these relays, and the cold water valve
> relay is totally shot. I have replacement relays on order, but want to
> add arc suppression to prolong the life of the relays.
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