Hello,
I'm trying to build a new trigger (timer and/or motion detector) for my small fog machine. It initially had a wireless trigger device which plugged into the 3-conductor connector at the rear of the machine. The device has failed, and it is not clear to me what the 3 contacts are for.

I've been looking at the schematic for a while, and I do not get the logic of it. I understand that the thermostat (TSTAT) cycles on and off to keep the heater at the correct temperature, and the pump will only operate when the heater is off (TSTAT is open). Below is a quick wiring diagram I created. Can anyone explain the logic of how this circuit works?


With thanks,
Mike

 

Can you post a picture of what is inside the 'wireless trigger device' box that you say is plugged in to the back? After all, that is what you are looking to replace I guess? Should be a simple case of triggering the relays inside with your own sensor circuit?