P/N 466-5519 REV 0.01 • 24MAY19
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Connecting Wires (most common connections)
Mount the thermostat base to the wall using the wall anchors
and screws provided; level as needed. Connect the wires
according to the HVAC system type as below.
Standard Gas/Electric HVAC System Wiring
Figure 2:
Single stage heating and cooling
Note:
Connect the wires as marked from the HVAC system to the
corresponding terminals on the thermostat back.
*C wire (24VAC common) may not be present. If not,
batteries must be installed.
R vs RC and RH Connections
x
Single Transformer HVAC Systems:
Typical modern
central HVAC installations have an integrated heating
and cooling system with a single 24VAC transformer.
For these systems, there is only one 24VAC “R” wire
and it can connect to either the RC or RH terminal on
the thermostat. The thermostat is supplied with an RC-
RH jumper installed.
Do not remove the jumper for
common transformer HVAC systems
.
x
Separate Transformer HVAC Systems:
Some
installations may have separate heating and cooling
systems with separate 24VAC transformers. For those
systems there will be a separate “R” wire for the heating
system (RH) and cooling system transformers (RC).
To connect separate transformer systems,
FIRST REMOVE
THE SUPPLIED RH-RC JUMPER
. Then connect the
heating “R” wire to the RH terminal and the cooling “R” wire
to the RC terminal on the thermostat.
Heat Pump HVAC Systems Wiring
Figure 3:
Single stage heating and cooling
Notes:
Connect the wires as marked from the HVAC system to the
corresponding terminals on the thermostat back.
*
C wire (24VAC common)
Heat Pump systems usually have the C wire connected to
the thermostat. If there isn’t a C wire, batteries must be
installed.
**
O (
Orange
) or B (
Brown
) wire (changeover valve)
connect to the W2/O terminal on the thermostat.
Be sure to set the correct changeover operation (O =
changeover with Cool, B = changeover with Heat) in the
SETUP menu.
Connect the R wire to either RC or RH terminal.
Finish Wiring
x
If you have additional wires for 2 stage systems (W2,
Y2), see the wiring diagrams on page 5 and 6.
x
Check that the wires are screwed into the terminal
blocks firmly.
x
Gently pull on the wires to confirm the connection.
x
Push all the excess wiring back into the wall.
