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Remove Old Thermostat
Before removing wires from old thermostat, mark wires for
terminal identifi cation 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 snug-
ly, 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 fi re re-
sistant material (such as fi berglass insulation) to prevent
drafts from affecting thermostat operation.
7. Carefully line the thermostat up with the base and snap
into place.
Battery Location
2 "AA" alkaline batteries are included in the thermostat at the
factory with a battery tag to prevent power drainage. Remove
the battery tag to engage the batteries.
To replace batteries, set system to OFF, remove thermostat
from wall and install the batteries in the rear along the top of
the thermostat (see Figure 1). For best results, use a premi-
um brand "AA" alkaline battery such as Duracell
®
or Ener-
gizer
®
. 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 specifi c
system wiring information. After wiring, see CONFIGURA-
TION section for proper thermostat confi guration.
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
Power Stealing Switch
The Power Stealing Switches (Fig. 1) should be left in the
"On" position for most systems. The information in the fol-
lowing table details the thermostat power method and switch
options.
Figure 1 – Thermostat Base Multi-Stage 1F95EZ-0671
Rear view of thermostat
TERMINAL DESIGNATION DESCRIPTIONS
Terminal Designation Description
O/B ...............................Changeover valve for heat pump energized constantly in cooling and off/heating
Y2 ...............................2nd Stage Compressor
Y ...............................Compressor Relay
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 back-
light operation or remote temperature sensor operation 6 Powered closed 3rd wire for 3-wire zone valve
W/E ................................Heat Relay/Auxiliary Heat Relay (Stage 1) (3rd Stage Heat in HP2)
W2 ...............................2nd Stage Heat (4th Stage Heat in HP2)
L ...............................Compressor diagnostic indicator for systems with diagnostic connection typically found on Heat pump
systems or with Copeland's Comfort Alert
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)
Thermostat Power Method Switch Position/Description
Battery Powered, no 24 Volt
system power available.
Switches "On", thermostat runs
on batteries.
Hardwired with Battery
Back-up, for 24 Volt systems
with common connection from
transformer to "C" terminal on
thermostat.
Switches "On", thermostat
runs on power directly from
transformer with battery back-
up.
*Battery Powered with Power
Stealing Assist, for 24 Volt
systems with no common
connection from transformer to
"C" terminal on thermostat.
Switches "On", thermostat runs
on batteries and supplemental
power drawn through the heat
or cool circuit.
*Power Stealing Assist is very reliable to increase battery life,
but on a small number of heating or cooling systems with high
impedance electronic modules you may observe one of the fol-
lowing conditions:
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.