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Thread: Requesting help connecting C wire to Honeywell TH8110R1008

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    Requesting help connecting C wire to Honeywell TH8110R1008

    Hello All,
    Can someone please guide me? I have a Honeywell TH8110R1008 Redlink Vision Pro thermostat. I would like to add some sensors and wifi gateway to it. For that I need a C wire connected to it. Currently its only connected to Honeywell R8845U-1003 Universal Switching Relay with Internal Transformer which is connected to the boiler. Currently only R and W wire is going to the Thermostat from the relay. Can you please tell me how I can connect the c wire? Should I connect a wire from the relay to the thermostat or purchase a transformer that i can plug into a outlet and get the c wire from there?

    I think there is already a transformer nearby. I am not sure though. I added all the pictures.

    Please help!! Thanks.
    Click image for larger version. 

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    Last edited by ikhtiyar; 01-09-2018 at 10:38 AM.

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