C wire connection Hydrostat Model 3250-Plus

[Esnyder]

Ok so my Nest Learning Thermostat says I need an adapter, basically adding a C wire connection. I have the control unit on my furnace referenced in the subject (Hydrostat Model 3250-Plus) and can't find an obvious C connection. The existing thermostat wires connect to two screw posts both labeled T (red and white). There are three posts (without screws) labeled WWSD, C and OR but I have no confidence that is the "C" I'm looking for and would need some other type of connector.

[Jhonleanmel]

Hi Esnyder,

Thanks for posting.

Your wire label indicates an incompatible system.

These systems usually only work with thermostats made by the same manufacturer. But some incompatible systems may also have the option to use standard heating system wires. Contact a local pro and have them check if your system can be rewired to be Nest compatible.

Best,
Mel

[Esnyder]

I don't know if this was meant for me (I'm not Peter23) but FWIW my unit is working fine with a two wire connection (no C). To say "These systems usually only work with thermostats made by the same manufacturer." seems implausible. I went through the wiring beforehand and was advised of the compatible thermostat. If some manufacturer's units are incompatible I would think that Google would have us check the manufacturer and not just the wiring.

[Jake]

Hey there,

Sorry for the late reply. I wanted to follow up. Please let me know if you have any questions from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

[Jake]

Hey there,

I wanted to check in and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.

Best regards,
Jake

[Esnyder]

Like I said, it is working without the C wire connection. Thanks I guess although nothing here has been helpful.