Originally Posted by ChuckGant
I sincerely appreciate your diagram. That helps a lot. One question... Yours shows that we use 3&4 and 6&8, but the diagram above indicates that I should use 3&5 and 6&7. Thoughts?
The choice of which pairs to use sets up the desired operation of the device:
Connect heater between C and NC (normally closed) if you want the power to be ON to the output when the relay is deactivated, and the power to turn OFF when you activate the relay. The relay opens the circuit when activated.
Connect heater between C and NO (normally open) if you want the power to be OFF to the output when the relay is deactivated, and the power to turn ON when you activate the relay. The relay closes the circuit when activated.
For our remote heater activations, we want to connect in the second manner (turn heat on when activated). I also see that the NO vs NC terminals are swapped on the second diagram you posted, so you should verify the actual setup of your device, too. It's the NO vs NC (terminal function
) that matters, not the specific terminal number.