Tekmar 518 thermostat to the 3200 Hydrostat wiring

NoelAnderson

I am wanting to connect a Tekmar 518 thermostat to the 3200 Hydrostat in a FORCE04ENRHG1 boiler (rebadged Burnham). Can I connect the C terminal of the Tekmar 518 to the Z terminal of the 3200 Hydrostat or must I use a separate transformer instead of the one in the Hydrostat? There are no zone valves or any other controls except what is on the boiler for the Feild's damper and the Honeywell ignition and gas valve. I will be connecting the Tekmar's R terminal to the Hydrostat's TV terminal and the Tekmar's W1 terminal to the Hydrostat's T terminal. The Hydrostat's instructions does not say anything when a T-Stat needs a common - wire.

Thanks
Noel

Robert O'Brien

I would think the integral transformer can handle the slight load of the 518, but Hydrostat recommends not using it to power zone valves. I'd call them

NoelAnderson

I just talked to support at Hydrostat and they said that their 3200 Hydrostat cannot even supply enough power to handle an electronic thermostat.

Mike_Breault

Mike from tekmar here, runa seperate transformer and use the 518 dry contacts to run the boiler, good luck

NoelAnderson

Thanks Mike for your support from Tekmar. That is my plan, I just received the parts yesterday.