2
Remove Old Thermostat
Before removing wires from old thermostat, mark wires for
terminal identification so the proper connections will be made
to the new thermostat.
Installing New Thermostat
1. Pull the thermostat body off the thermostat base. Forcing
or prying on the thermostat will cause damage to the unit.
2. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.
3. Move base out of the way. Drill mounting holes. If you
are using existing mounting holes and the holes drilled
are too large and do not allow you to tighten base snugly,
use plastic screw anchors to secure the base.
4. Fasten base snugly to wall using mounting holes shown
in Figure 1 and two mounting screws. Leveling is for
appearance only and will not affect thermostat operation.
5. Connect wires to terminal block on base using appropriate
wiring schematic.
6. Push excess wire into wall and plug hole with a fire
resistant material (such as fiberglass insulation) to prevent
drafts from affecting thermostat operation.
8. Install 2 "AA" alkaline batteries.
7. Carefully line the thermostat up with the base and snap
into place.
Battery Location
2 "AA" alkaline batteries are included with the thermostat.
Install the batteries before snapping the thermostat on the
base. Install the batteries in the rear along the top of the
thermostat (see Fig. 1).
To replace batteries, set system to OFF and remove
thermostat from wall. For best results, use a premium brand
"AA" alkaline battery such as Duracell
®
or Energizer
®
. If the
home is going to be unoccupied for an extended period (over
3 months) and
is displayed, the batteries should be
replaced before leaving.
WIRING CONNECTIONS
Refer to equipment manufacturers' instructions for specific
system wiring information. After wiring, see CONFIGURA-
TION section for proper thermostat configuration.
Wiring diagrams shown are for typical systems and describe
the thermostat terminal functions.
WARNING
!
Thermostat installation and all components of the
control system shall conform to Class II circuits per
the NEC code.
INSTALLATION
Figure 1 – Thermostat Base Multi-Stage 1F95EZ-0671
Rear view of thermostat
2 "AA" Batteries
Power Stealing
Switches
*
* A1 For Damper Control Not Applicable To This Model.
Place Level
across Mounting Tabs
(for appearance only)
Mounting
Hole
Mounting
Hole
Place Level
across Mounting Tabs
(for appearance only)
Power Stealing Switch
The Power Stealing Switches (Fig. 1) should be left in the
"On" position for most systems.
Power Stealing Assist is very reliable to increase battery life,
drawing a small amount of power from the HVAC system. But
on a small number of heating or cooling systems with high
impedance electronic modules you may observe one of the
following conditions to indicate that Power Stealing Assist is
incompatible:
1. The furnace draft inducer motor may run with no call for
heat.
2. The furnace fan may turn on with no call for heat or may
not turn off.
3. The furnace may not turn off when the call for heat ends.
4. The air conditioner may not turn off when the call for cool
ends.
If the Power Stealing Assist method is not compatible with
your system, place the Power Stealing Switches to "Off". This
cancels Power Stealing Assist, operates the thermostat on
batteries and corrects the condition.
Terminal
Designation
Single Stage Multi Stage Heat Pump 1 Heat Pump 2
O/B Changeover Terminal Energized in Heat (B) or Cool (O) for Heat Pump or Damper Systems
Y2 No Output 2nd Stage Compressor No Output 2nd Stage Compressor
Y Cool Mode
Compressor Relay
Cool Mode 1st Stage -
Compressor
Heat and Cool Mode 1st Stage -
Compressor
Heat and Cool Mode 1st Stage -
Compressor
G Fan Relay
RC Power for Cooling
RH Power for Heating
C "Common wire from secondary side of cooling (Optional). Required for fault indication, continuous backlight
operation or remote temperature sensor operation"
6 Powered closed 3rd wire for
3-wire zone valve
No Output No Output No Output
W/E Heat Mode Heat Mode 1st Stage Heat Mode 2nd Stage,
Emergency Mode 1st Stage
Heat Mode 3rd Stage,
Emergency Mode 1st Stage
W2 No Output Heat Mode 2nd Stage Heat Mode 3rd Stage,
Emergency Mode 2nd Stage
Heat Mode 4th Stage,
Emergency Mode 2nd stage
L System Diagnostic Terminal - Displays Call for Service
