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INSTALLATION
REMOVE OLD THERMOSTAT
1. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.
2. Remove the front cover of the old thermostat. With wires
still attached, remove wall plate from the wall. If the old
thermostat has a wall mounting plate, remove the thermostat
and the wall mounting plate as an assembly.
3. Identify each wire attached to the old thermostat using
the labels enclosed with the new thermostat.
4. Disconnect the wires from old thermostat one at a time. DO
NOT LET WIRES FALL BACK INTO THE WALL.
5. Install new thermostat using the following procedures.
ATTACH THERMOSTAT BASE TO WALL
1. Remove the packing material from the thermostat.
2. If necessary, cut the non-electric heat jumper (see NON-
ELECTRIC HEAT SYSTEMS) and/or the EMR jumper (see
ENERGY MANAGEMENT RECOVERY). Check the set-
ting of the O/B switch (see O/B TERMINAL SWITCH
SELECTION).
3. If you want to program the thermostat before mounting the
thermostat on the wall, see ARMCHAIR PROGRAMMING.
4. Gently pull the thermostat cover straight off the base. Forcing
or prying on the thermostat will cause damage to the unit.
5. Check that the SYSTEM switch is in the OFF position.
Connect wires beneath terminal screws on base using
appropriate wiring schematic (see figs. 3 through 5).
6. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.
7. Move base out of the way. Drill mounting holes.
8. Fasten base loosely to wall, as shown in fig. 2, using two
mounting screws. Place a level against bottom of base,
adjust until level, and then tighten screws. (Leveling is for
appearance only and will not affect thermostat operation.) If
you are using existing mounting holes, or if holes drilled are
too large and do not allow you to tighten base snugly, use
plastic screw anchors to secure subbase.
9. Push excess wire into wall and plug hole with a fire-resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.
NON-ELECTRIC HEAT SYSTEMS
Read the following information before clipping the non-electric
heat jumper. If you are unsure of your application, contact a
qualified serviceperson.
If your emergency or auxiliary system is non-electric (gas, oil,
etc.) and will energize the blower, then jumper, W904, on the
back of the thermostat base must be cut (see fig. 1).
If your emergency or auxiliary heat system is electric and
requires that the thermostat energize the fan circuit, do not cut
jumper W904.
ENERGY MANAGEMENT RECOVERY
(EMR)
When the EMR feature is activated, the thermostat's microcom-
puter automatically calculates the time it will take to change the
room temperature to the next program setting. Then the thermo-
stat will start the heating or cooling system before the next
programmed period so that the desired temperature is reached
at or near the beginning of the next program period (the
thermostat calculates 30 minutes for every 2°F temperature
change).
For example, assume that the thermostat is programmed to
provide an overnight heating temperature of 66°F, and during
the next program period, beginning at 6:00 AM, the programmed
temperature is 70°F. With EMR activated, the thermostat will
automatically start the heating system at 5:00 AM, so that the
programmed temperature of 70°F is reached by about 6:00 AM.
If the overnight room temperature drops only to 68°, the thermo-
stat will start the system at 5:30 to reach the programmed
temperature of 70° at 6:00.
The thermostat is shipped with the EMR feature active, which
means that the thermostat will start the system before the
beginning of the next program period. This feature provides
better efficiency by allowing gradual temperature changes using
only the first stage of heat and cooling.
To de-activate the EMR function, clip wire W903 on the back
of the thermostat (see fig. 1). The thermostat will then wait until
the programmed time to start the system for a temperature
change. This may cause the more costly electric second stage
of heating to be used.
Figure 1. Back of thermostat base
W904
CUT FOR
NON-ELECTRIC
AUX.
O
B
W903
CUT TO DEFEAT EMR
BATTERY CUTOUT FOR
ARMCHAIR PROGRAMMING
Figure 2. Thermostat base
SET TIME
RUN PRGM
VIEW PRGM
HOLD TEMP
AUTO
FAN ON
COOL
OFF
HEAT
EMER
Reset Button
Mounting
holes
Screw anchors
L
E
Y
W2
O/B
R
G
C