INSTALLATION
REMOVE OLD THERMOSTAT
W904
CUT FOR
NON-ELECTRIC
AUX.
1. Shutoffelectricityatthemainfuseboxuntilinstallation
is complete. Ensure that electrical power is discon-
nected.
BATTERY CUTOUT FOR
ARMCHAIR DEMONSTRATION
2. Remove the front cover of the old thermostat. With
wires still attached, remove wall plate from the wall.
Iftheoldthermostathasawallmountingplate, remove
the thermostat and the wall mounting plate as an
assembly.
O
B
3. Identify each wire attached to the old thermostat
usingthelabelsenclosedwiththenewthermostat.
4. Disconnectthewiresfromoldthermostatoneatatime.
DO NOT LET WIRES FALL BACK INTO THE WALL.
Figure 1. Back of thermostat base
5. Install new thermostat using the following procedures.
Reset Button
ATTACH THERMOSTAT BASE TO WALL
Screw anchors
1. Remove the packing material from the thermostat.
2. If necessary, cut the non-electric heat jumper (see
NON-ELECTRIC HEAT SYSTEMS). Check the set-
ting of the O/B switch (see O/B TERMINAL SWITCH
SELECTION).
C
L
E
G
3. If you want to review the thermostat features before
mounting the thermostat on the wall, see ARMCHAIR
DEMONSTRATION.
W2
Y
R
O/B
4. Gently pull the thermostat cover straight off the base.
Forcing or prying on the thermostat will cause damage
to the unit.
FAN ON
AUTO
OFF
HEAT
COOL
EMER
Mounting
holes
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).
Figure 2. Thermostat base
6. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.
If your emergency or auxiliary heat system is electric and
requires that the thermostat energize the fan circuit, do
not cut jumper W904.
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. (Lev-
eling is for appearance only and will not affect thermo-
stat 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.
O/B TERMINAL SWITCH SELECTION
The O/B switch on this thermostat is factory set to the “O”
position.Thiswillaccommodatethemajorityofheatpump
applications, which require the changeover relay to be
energizedin COOL. Ifthethermostatyouarereplacingor
the heat pump being installed with this thermostat require
9. Push excess wire into wall and plug hole with a fire- the “B” terminal, to energize the changeover relay in
resistant material (such as fiberglass insulation) to HEAT, the O/B switch must be moved to the “B” position.
prevent drafts from affecting thermostat operation.
ARMCHAIR DEMONSTRATION
NON-ELECTRIC HEAT SYSTEMS
Armchair Demonstration is a unique feature that allows
Read the following information before clipping the non- you to review your thermostat features before being
electric heat jumper. If you are unsure of your application, mounted on the wall.
contact a qualified serviceperson.
If you wish an Armchair Demonstration of your thermo-
Ifyouremergencyorauxiliarysystemisnon-electric(gas, stat, temporarily hold a new 9-volt battery against the
oil, etc.) and will energize the blower, then jumper, W904, wires in the battery cutout on the back of the thermostat
onthebackofthethermostatbasemustbecut(seefig. 1). base for approximately 45 seconds. This will provide a
charge that will last approximately 30 to 45 minutes to
allow the thermostat to be observed.
2