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A Handyman Helping Hand

Isolating Relay for Hot Water Heat

Posted By: Marcus Ogin
Thursday, 14 December 2000, at 10:51 a.m.

I have a three-wire relay system for my hot water heat. I want to replace the old mercury switches with digital but I can't find any that are compatible with three wires. The instructions say I need an isolating relay to convert my three-wire signal into two. I don't know where to get such a relay or how to install one.

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