Subject says it all. We have a natural gas fireplace with a mechanical thermostat, and I'd like to replace it with a smart one that I can set/change the temperature when the room is in use, and be sure to turn it off at night to save money.
Existing thermostat is made by White-Rogers, I've attached 3 pictures of. I'm not sure how this works, but based on what I could find online it has 2 wires which use 24VAC to turn on/off the fireplace. There appears to be a mercury switch, riding on a bimetalic spring.
Hoping to find something that would work as a drop in replacement. I haven't measured the voltage across the two connection wires to see if it is indeed 24VAC.
ELECTRICAL DATA
Switch Rating: 24vAC (30vAC max.)
Adjustable Heat Anticipator - 0.15 to 1.2 Amps
Switch Action: SPST - Sealed mercury switch
THERMAL DATA
Temperature Range:
Standard = 10 to 32 C (50 to 90 F)
Low Range = 4 to 24 C (40 to 75 F)
Differential: 1/2 C (1 F)
There's a chance that this is a different sub-model from what I have. My recollection is that it would have been installed in the 1990s along with the fireplace.
I suspect it just opens/closes a contact when the temperature transitions across the set point. There's a 2 wire cable coming out of it over to the fireplace. Looks a lot like lampcord.
I have an ecobee 3 lite used for our furnace. Looking for something similar for the fireplace. I assume that it will need to be battery powered, given that I don't think the 2 wire connections are useful for power.
Try the Vivint SCT200. Battery operated(&/or 24volt) and does millivolt systems. It's z-wave plus and I've been testing mine for the last 3 weeks, rock solid and very good solid z-wave connection.
