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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 FAN
OPTION JUMPER) and/or the EMR jumper (see ENERGY
MANAGEMENT RECOVERY). Check the setting 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. Pull wires through hole in base and place base over hole in
wall. Mark mounting hole locations on wall using base as a
template.
6. Move base out of the way. Drill mounting holes.
7. 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.
8. 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).
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.
FAN OPTION JUMPER
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 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 requires that the
thermostat energize the fan circuit, do not cut jumper W904.
ENERGY MANAGEMENT RECOVERY
(EMR)
The EMR feature allows, the thermostat's microcomputer to
automatically calculate the time it will take to change the room
temperature to the next program setting. Then the thermostat
2
O
B
Figure 1. Back of thermostat base
Reset Button
S E T T
IM E
V IE W
P R G M
R U N
P R G M
H O L D
T E M P
Mounting
holes
Figure 2. Thermostat base
will start the heating system before the next programmed
period so that the desired temperature is reached at or near the
beginning of the period (the thermostat calculates 15 minutes
for every 1 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 68F , the
thermostat will start the system at 5:30 to reach the programmed
temperature of 70 F at 6:00.
The thermostat is shipped with the EMR feature active, which
means that the thermostat will start the heating 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.
To deactivate 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.
W904
CUT FOR
NON-ELECTRIC
AUX.
BATTERY CUTOUT FOR
ARMCHAIR PROGRAMMING
W903
CUT TO DEFEAT EMR
Screw anchors
C
L
E
G
W 2
Y
R
O /B
F A N O
N
A U T O
O F F
H E A T
C O O L
E M E R
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