Google Nest GVNZ4 Nest Power Connector Installation Guide - Manuals
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Google Nest GVNZ4 Nest Power Connector Installation Guide – Manuals

google nest gvnz4 nest power connector

security considerations

summary

The Nest Power Connector is a simple and easy to install c-wire replacement for Nest Thermostats. allows the thermostat to access power through the existing thermostat wiring without having to pull new wires. and only requires one connection at the heater, air handler, or zone controller.

Reading: How to connect nest power connector

what’s in the box

  • nest power connector
  • wire connectors (2)
  • wire labels
  • adhesive pad
  • guide installation
  • warranty

compatibility

systems for use with 24 vac hvac systems only. it is not compatible with millivolt or high voltage systems.

technical specifications operating temperatures: -22° to 140° f (-30° to 60° c) rated voltage: 20 to 30 vac ingress protection: ip51

thermostats

  • nest thermostat (2020)
  • nest thermostat e
  • nest learning thermostat (3rd generation)

installation

Before you begin, watch the installation video at g.co/nest/powerconnectorinstall. The Nest Power Connector installs between the thermostat wiring and the rest of the HVAC equipment. if the system has a thermostat, you will need to install the nest power connector on the furnace or air handler. If the system has more than one thermostat in a zoned system, you will need to install the nest power connector on the zone controller. A nest power connector is required for each nest thermostat. On the furnace or air handler, locate where the wiring from the thermostat connects to the hvac equipment. It is normally located on a control board, but on some systems, especially ovens, there is no control board. in this case, the thermostat wiring is attached to a series of wire nuts (or similar). sometimes it is necessary to remove a secondary cover inside the hvac equipment to access this location. on a zone controller, locate the proper wiring for the thermostat that the nest power connector will work with.

make sure the nest thermostat is installed

If it isn’t, follow the instructions provided with the thermostat to complete installation.

if necessary, update the nest thermostat software

a. no update needed for nest e thermostat or nest learning thermostat (3rd generation). b. the nest thermostat (2020) must be running version 1.1 or later. on the device, go to settings > version > update.

turn off power at circuit breaker

open the cover of the hvac equipment

The Nest Power Connector installs or plugs in the same place where all standard thermostat connections would normally be made, at the furnace, air handler, or zone controller. see installation on page 5 for more information. open the cover at this location and find where the nest power connector should be installed.

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choose the appropriate diagram from the list below and follow it to install the nest power connector

a. heating and cooling system b. cooling only systemc . heating only system d. if no c terminal is present on the hvac system other systems

install the nest power connector

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a. heating and cooling system connect the nest power connector to y. your system may have additional wires, such as a g wire (to thermostat) and c and y wires (to compressor). keep them connected. properly terminate any loose wires. optional: use the adhesive pad to connect the nest power connector to the panel.

Installation diagram Cooling and heating system

b. cooling only system

Your system may have additional wires, such as a g wire (to thermostat) and c and y wires (to compressor). keep them connected. properly terminate any loose wires. optional: use the adhesive pad to connect the nest power connector to the panel.

Installation diagram Cooling-only system

c. heating only system

Your system may have additional wires, such as a g wire (to the thermostat). keep them connected. properly terminate any loose wires. optional: use the adhesive pad to connect the nest power connector to the panel.

Installation diagram Heating-only systemD. If no C terminal is present in the HVAC system You’ll need an external 24 VA/20 VA transformer and additional wire nut/lever lock connectors.

  1. Remove the Nest Power Connector cap.
  2. Remove the Nest Power Connector jumper.
  3. Refit the Nest Power Connector cap.Installation diagram If no C terminal is present in the HVAC system
  4. Wire external transformer C wire to the Nest Power Connector C wire.
  5. Wire external transformer R wire, the Nest Power Connector R wire, and thermostat R wire in a 3-way splice.
  6. Properly terminate any loose wires. 7. Connect the external transformer to a power source. Optional: Use the sticky pad to attach the Nest Power Connector to the panel.Installation diagram If no C terminal is present in the HVAC system
close the cover of the hvac equipment

Once you’ve finished installing the Nest Power Connector, close the covers to the HVAC equipment, then turn on the power. There is often a safety switch controlled by the cover that will prevent operation until it is replaced.

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confirm nest power connector installation on thermostat at g.co/nest/checkpowerconnector
  1. For the Nest Thermostat E and the Nest Learning Thermostat (3rd gen), no wiring or power errors are shown on the device.
  2. For the Nest Thermostat, go to Settings > Equipment > Power Connector to run a Power Test, then confirm the status is detected in Power Info. All power errors should now be resolved.
  3. Make sure you can activate heating and cooling from the thermostat.

other systems

“taco” zone controllers

“taco” zone controllers are more common for multi-zone heating-only hydronic systems.

  1. if the thermostat terminals are labeled t&t, look for a separate connector labeled for 24 vac and com. com is the c terminal connection.
  2. Using a digital multimeter, confirm which t terminal is connected to the 24 VAC connection. label this wire and connection r.
  3. label the other terminal t w. 4. Follow the heating-only diagram above.

troubleshooting

no wi-fi to update nest thermostat software

To work with the nest power connector, the nest thermostat will need a software update to version 1.1 or later. This update can only be done over Wi-Fi, so if your thermostat is not already connected to Wi-Fi, follow the instructions in the Google Home app to get started. you can also use a mobile hotspot to connect to the internet. the user account can be removed from the thermostat after the software update is complete.

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millivolt systems the nest power connector and nest thermostats are incompatible with millivolt heating systems. These systems often have the thermostat wiring connected to a gas valve with terminals labeled th, tp, and th. To confirm that a system is millivolt, measure the voltage across the thermostat terminals/wiring while system power is on. a millivolt system will read ~0.5 vdc. compatible 24 vac systems will read between 20 and 30 vac.

power errors before installation on the nest thermostat, there may be e197, n260 or n261 errors before installation. these errors can be resolved by properly installing the nest power connector or a common cable.

other wires are present during installation on some systems, particularly those with refrigeration, it is common to have a second bundle of 2 wires connected to the control board that controls the A/C compressor. leave these and any other connected cables in place. the nest power connector is only installed between the incoming wiring of the thermostat and the rest of the hvac equipment.

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“no power” errors after installation

  1. e298 on nest thermostat
  2. e73 or e74 on nest learning thermostat (3rd generation)
  3. e196 on nest e thermostat

thermostat is not receiving power. confirm that it has been turned back on and that the hvac equipment cover is closed (there is often a safety switch controlled by the equipment cover). confirm system fuses and check and tighten all connections.

“low power” errors (n260/n261) after installing n260/n261 on nest thermostat. these errors can be resolved when the nest power connector is properly installed with the thermostat. confirm that the nest power connector is installed in the correct location and on the correct cables. check that all cables are connected correctly.

nest power connector not detected If the nest thermostat does not detect the nest power connector after performing a power test, go to settings > team > power connector > power test:

  1. confirm that all electrical connections have been made correctly and wiring is properly connected.
  2. if there is more than one thermostat, confirm that the nest power connector has been installed on the controller zone and not in the air conditioning unit.

on the nest thermostat, the power connector is not displayed in settings > equipment your nest thermostat may need a software update. check for an update in settings > version > update and confirm that the thermostat is version 1.1 or later.

e297 errors on nest thermostat after installation your nest thermostat may need a software update. check for an update in settings > version > update and confirm that the thermostat is version 1.1 or later.

no wires from nest thermostat detected after nest power connector is installed run a power test on the thermostat from settings > team > power connector > power test. then try activating the function controlled by the undetected wires (for example, heating or cooling) by changing the desired temperature and thermostat mode. you can also try to run the fan from the settings.

hvac equipment terminals are not labeled identify the wires and colors used on the thermostat for r, w, and y and match those corresponding wires to label the terminals on the hvac equipment.

questions?

Contact our support team by phone at 855-vip-nest.

Google-Nest

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documents / resources

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