Google Nest GVNZ4 Power Connector Installation Guide

Google Nest GVNZ4 Power Connector

Basic safety

Read all installation instructions and the safety and warranty guide before installation.

High voltages may be present! Be sure to turn off the power at the breaker panel or unplug your heater and/or air conditioning unit before attempting installation or disconnecting any wires.

Use caution when accessing your heater and/or air conditioning unit. Call a pro if you are not comfortable installing this product. Installation will require access to wiring, and may require the use of ladders or working in locations with little space. Use a helper if possible and avoid installing the device when home alone.

Technical specifications

Setup process

1. Install your Nest thermostat

2. Update your thermostat

3. Turn off the power at the circuit breaker

4. Open the HVAC equipment cover

5. Find the HVAC control board

6. Label the thermostat wiring

7. Install the power connector
   a. Cooling and heating system
   b. Heating-only system
   c. Cooling-only system
   d. No C-terminal

8. Close the HVAC cover and turn on the power

9. Confirm power connector installation

Compatibility

Nest Thermostat, Nest Thermostat E, Nest Learning Thermostat 3rd gen. 24V VAC systems only. Millivolt or high voltage systems are incompatible.

Before you start

Watch an install video at g.co/nest/powerconnectorinstall

Professional installation recommended

Connect with an independent installer who’s trained to install Google Nest products at g.co/nest/install

Get advanced instructions at g.co/nest/powerconnectoradvanced

What’s included

Install the power connector at your HVAC equipment, not your thermostat. If you have multiple thermostats, install at your zone controller.*

Box where wires from multiple thermostats connect

Install your Nest thermostat

Install your thermostat before the power connector

Update your thermostat

Nest Thermostat
Go to Settings > Version > Update and get version 1.1 or later

Troubleshooting

• You may see a wiring error. This’ll go away after installing the power connector.
• Adjust your thermostat target temperature so your system isn’t heating or cooling. This can prevent some errors.
• Replace thermostat batteries if prompted

Nest Learning Thermostat 3rd gen and Nest Thermostat E No need to update

Find additional instructions at g.co/nest/nestpowerconnectorupdate
To check which thermostat you have, visit g.co/nest/whichthermostat

Turn off the power at the circuit breaker

This protects you and your equipment

Open the HVAC equipment cover

Find the HVAC control board

This is the main circuit board in your HVAC that is wired to your thermostat. If you don’t have a control board, find the thermostat wires.

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

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

Install the power connector

A. Cooling and heating system
Wire the power connector to Y

Your system may have extra wires, like a G wire (to the thermostat) and C and Y wires (to the compressor). Keep them connected.
Properly terminate any loose wires
Optional: Use the sticky pad to attach the power connector to the panel

B. Heating-only system

Your system may have extra wires, like a G wire (to the thermostat). Keep them connected.
Properly terminate any loose wires
Optional: Use the sticky pad to attach the power connector to the panel7

C. Cooling-only system

Your system may have extra wires, like a G wire (to the thermostat) and C and Y wires (to the compressor). Keep them connected.
Properly terminate any loose wires
Optional: Use the sticky pad to attach the power connector to the panel

D. No C-terminal

Professional installation recommended
Connect with an independent installer who’s trained to install Google Nest products at g.co/nest/install
Find advanced instructions at g.co/nest/powerconnectoradvanced

Close the HVAC cover and turn on the power

To turn on your power and thermostat, the HVAC cover must be closed. Your system may not turn on with the cover open.

Confirm power connector installation

For Nest Thermostat, go to Settings > Equipment to check that your power connector is installed
For Nest Learning Thermostat 3rd gen and Nest Thermostat E, there’s no need to check
For help, visit g.co/nest/checkpowerconnector

We’re here to help
For online help and support,
visit g.co/nest/help
For help with accessibility,
visit g.co/disabilitysupport

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