Honeywell RTH9580 Wi-Fi Quick Start Manual page 9

1.7 Attach thermostat
to wallplate
Align the thermostat with
wallplate and snap into
place.
1.8 Switch heating/cooling
system ON
Important!
1.8a Verify that the C wire is
connected at the thermostat
and at the heating/cooling
system.
1.8b Make sure the heating/
cooling system door is
firmly secured.
1.8c Switch power back ON for
your heating/cooling system
at the breaker box or its
power switch.
Wallplate
Thermostat
Circuit
breaker
box
9
LEVEL
HERE
M34498
or
Heating/cooling
M31535
system power
switch