Operation Manual

5. Label wires
Peel off the blue labels and attach them to
your wires. Use the white labels if you have a
E, W3, HUM or DEHUM wire. You can connect
only one of these wires to the * connector.
See two labels for each connector?
Visit nest.com/2labels for help.
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.
CAUTION: Do not connect Nest to
high voltage wires.
Remember, the power to your
HVAC system must be off to avoid
blowing a fuse in your equipment.
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.
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.
6. Disconnect wires and
remove base
7. Mark where screws will go
Use the bubble level to make sure the
Nest Thermostat is level.
Breaker box
Switch
Two labels
Tip: Take a
picture of the
wires on your
old thermostat
to help you
remember.