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Need help installing Nest Power Connector to Robertshaw Ignition Control Unit

kapolei_kid
Community Member

‎02-25-2024 03:36 PM

Hi Community, Can you please help me with the installation of Google Nest Thermostat? I have a Robertshaw 780-715 U Ignition Control Unit (non-lockout model) in my gas furnace. I assume I need the Nest Power Connector since I only have two wires (red and white) that goes to my existing thermostat which I want to replace with the Google Nest Learning Thermostat. Which wires from the Nest Power Connector connects to the Robertshaw ICU?Any help and/or suggestions welcome.

Here's a drawing of the wiring of the components for my heater.

 

gas furnace wiring diagram v3.drawio.pngrobertshaw 780-715 U picture2.jpggas valve wiring.jpg

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kapolei_kid
Community Member

‎02-28-2024 12:56 PM

Wanted to update thread. Received Nest Learning Thermostat (3rd gen) a few days ago and finally installed it today with just the two wires (red and white). Everything appears to be working! So apparently in my situation, the 3rd gen Nest works with just 2 wires and the Nest Power Connector is not necessary. Happily learning how to use thermostat with Nest/Google Home app. 👍

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