Google T30 User Guide

Learning Thermostat

™

Installation Guide

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Compatibility

Based on Nest’s online compatibility checker data, the Nest Thermostat works with
most 24V systems, including gas, electric, oil, forced air, variable speed, heat pump,
and radiant. It can control:

• Heating: one, two, and three stages (W1, W2, W3)

• Cooling: one and two stages (Y1, Y2)

• Heat pump: with auxiliary and emergency heat (O/B, AUX, E)

• Fan (G)

• Power (C, RH, RC)

• Humidifier or dehumidifier (HUM, DEHUM)

The Nest Thermostat’s
W3, E, HUM or DEHUM.

The Nest Thermostat is designed to work even if your home doesn’t have a common (C) wire.
Rarely, installing a new C wire may be required.

Professional installation recommended for:

• Dual fuel systems (heat pump with furnace)

• Whole-home humidifiers and dehumidifiers

connector can accept only one of these wires:

*

Watch the video

To see how it’s done, watch our installation video at support.nest.com/thermostat

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Contents

1. Switch off power

This protects you and avoids blowing a fuse
in your equipment. Adjust the temperature
on your old thermostat to make sure your
system is off.

2. Remove cover

Some covers pop off, while others need
to be unscrewed.

Breaker box

Display

Base

Screwdriver

3. Check your system

If your old thermostat is labeled 120V or 240V
or has thick wires with wire nuts, your system
is high voltage. Not sure? Contact support.

Wall screws

Optional trim plate

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Optional steel plate

Optional steel

plate screws

CAUTION: Do not connect Nest
to high voltage wires.

Switch

4. Remove any jumper wires

Jumper wires are short wires between two
connectors. You won’t need them. An R wire
can go into either RC or RH.