View single post by cwilkins
 Posted: Sat Jan 28th, 2006 02:12 am
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Joined: Fri Jan 20th, 2006
Posts: 9
 Whatever you use to seal the board, you really need to seal the relay (aka contactor) as well.  The problem is moisture, both in the form of simple high humidity, and possible condensation directly on the board.

This moisture could lead to corrosion, electrical current leakage, and accelerated erosion of relay contacts.  Any of those could cause the board to fail (ahead of schedule, I mean), or worse.

So both sides should be dipped/sprayed/whatever thoroughly to ensure a complete "hermetic" seal of the board and all components, especially the relay.

Here's one option (brush-on application, acrylic lacquer based): ...or you can google for "conformal coating."

Now I suspect it's quite likely that you could neglect to seal the board/relay and suffer no ill effects at all, but I don't like taking my fridge apart and installing $50 parts any more than necessary, so I'm not taking any chances.

My $0.02...  Apologies in advance to those who think all this is obvious. :)