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A relay is a control device that allows a small voltage or current to control a larger voltage or current. Use this tag for questions about standalone relays in electrical or HVAC wiring -- questions about relays in appliances do not need this tag.

2
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I talked to a local HVAC repairman, and he said it should work, so I did it, and it works. Here's what the circuit looks like:
answered Mar 16 '18 by Moshe Katz
2
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", I assume that it actually means "complete circuit"), I am trying to figure out another way to do this. What I would like to do is hook up the heat through a relay. That way, I can send power to the … connect the trigger side of the relay, which will close the circuit on the heater wires that used to go to Rh and W. I have two concerns: Is there any special relay I need, or will anything I find …
asked Mar 15 '18 by Moshe Katz