Google Nest Power Connector Guide D'installation page 7

6. Label the thermostat wiring
Take a photo of the wiring. Your wiring may
look different.
If your HVAC terminals aren't labeled, see advanced
instructions at g.co/nest/powerconnectoradvanced
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How to use wire connectors
1. Lift the levers to 90 degrees. The levers are stiff
2. Insert the wires and snap down the levers
3. Pull gently on the wires to check that
they're secure
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