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.
O
B
W904
CUT FOR
AUX.
BATTERY CUTOUT FOR
ARMCHAIR PROGRAMMING
W903
CUT TO DEFEAT EMR
ATTACH THERMOSTAT BASE TO WALL
1.Remove the packing material from the thermostat.
2.If necessary, cut the
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
NON-ELECTRIC HEAT SYSTEMS
Read the following information before clipping the
If your emergency or auxiliary system is
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
Figure 1. Back of thermostat base
Reset Button
Screw anchors
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| R | Y |
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SET |
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TIME | VIEW |
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| PRGM | RUN |
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| PRGM | HOLD |
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| ON | AUTO |
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EMER
Mounting
holes
Figure 2. Thermostat base
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
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