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Thread: Requesting help connecting C wire to Honeywell TH8110R1008

  1. 01-08-2018, 08:03 PM #1
    ikhtiyar
    ikhtiyar is offline
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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.  Name: Honeywell R8845U-1003 Universal Switching Relay with Internal Transformer.jpg  Views: 30  Size: 93.1 KB  ID: 1574
    Attached Thumbnails Attached Thumbnails Click image for larger version.  Name: IMG_3231.jpg  Views: 22  Size: 94.0 KB  ID: 1579   Click image for larger version.  Name: IMG_3228.jpg  Views: 21  Size: 90.5 KB  ID: 1576   Click image for larger version.  Name: Honeywell R8845U-1003 Universal Switching Relay with Internal Transformer 2.jpg  Views: 26  Size: 90.4 KB  ID: 1580   Click image for larger version.  Name: IMG_3230.jpg  Views: 22  Size: 91.9 KB  ID: 1578  
    Last edited by ikhtiyar; 01-09-2018 at 10:38 AM.
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