Need help wiring thermostat on boiler...


Old 01-25-14, 08:48 AM
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Need help wiring thermostat on boiler...

I have WeilMcLain cgm-6-pi boiler. I currently have a honeywell programmable thermostat which has 2 wires connected and is working fine. I want to install a wifi thermostat which requires a C wire. Since i have to run a new cable anyways and it would be really hard to do so in the current location of the thermostat i figured i run a brand new wire directly from thermostat (in new location) to the boiler. Can anyone please help me with wiring it on the boiler itself? I am attaching couple of photos. I am also attaching photo of the gauge on the boiler if you can tell me if its correct psi and stuff. Thanks in advance for any help.
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Old 01-25-14, 04:02 PM
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That appears to be all factory wiring. You could attach the common to the terminal marked "C" on the transformer pictured. Connect the red & white to where the existing thermostat wires are attached.

For a single story house & cold boiler the pressure looks fine.
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