Weil Mclain SGO with Carlin EZ gas T-Stat question.

Eric L._2 · October 2022

As the title states I have a Weil Mclain SGO steam boiler with Carlin EZ gas burner. Im trying in to install a vision pro 8000 th8321 but cant quite figure out where to pull a c wire from. Has anyone ever wired a smart stat to this combo before? Any advice?

Steamhead · October 2022

There is no C-wire hookup on this combination.

We generally mount a transformer-relay unit such as an R8239A:

https://www.supplyhouse.com/Resideo-R8239A1052-40-VA-Fan-Center-w-SPDT-Switching-Action-Includes-R8222B?utm_source=google_ad&utm_medium=shopping_neutral&utm_campaign=Shopping_Neutral_LPLTV&gclid=EAIaIQobChMIrPvxps3Q-gIVQpFbCh1QMAcfEAQYASABEgJlivD_BwE

on a 1900 box in a convenient spot.

Wire your red thermostat wire from R or RH on the thermostat to R on the transformer, green to C on both, white from W on the thermostat to G on the transformer. Run the normally open relay wires outside the box through a Romex connector or bushing, then run a thermostat cable from these to TT on the primary.

This will constantly power the thermostat as long as the power is on to the boiler.

Robert O'Brien · October 2022

Same concept as Steamhead mentioned, this is probably an easier installation
https://carlincombustion.com/kool-kit/

Eric L._2 · October 2022

Thank you both. I appreciate you sharing your knowledge. I will report back.

Eric

Steamhead · October 2022

Robert O'Brien said:
Same concept as Steamhead mentioned, this is probably an easier installation
https://carlincombustion.com/kool-kit/

@Robert O'Brien , how would you hook this up? The manual isn't too helpful............

Eric L._2 · October 2022

So in the end I bought some 18/7 wire and just ran it all new. Installed a 24v 40av tranformer at the boiler and 4 wires later all seems to work fine. Left myself a few wires in case I run a remote sensor. Again ,thank you all who replied.

Eric

Weil Mclain SGO with Carlin EZ gas T-Stat question.

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