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INSTALLATION
REMOVE OLD THERMOSTAT
1. Shutoffelectricityatthemainfuseboxuntilinstallationis
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. Installnewthermostatusingthefollowingprocedures.
ATTENTION!
Thisproductdoesnotcontainmercury.However,thisproduct
may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do
nottouchanyspilledmercury.Wearingnonabsorbentgloves,
take up the spilled mercury and place into a container which
can be sealed. If a cell becomes damaged, the unit should be
discarded.
Mercurymustnotbediscardedinhouseholdtrash.Whenthe
unit this product is replacing is to be discarded, place in a
suitable container. Refer to www.white-rodgers.com for location
to send the product containing mercury.
ATTACH THERMOSTAT BASE TO WALL
1. Removethepackingmaterialfromthethermostat.Gently
pull the cover straight off the base. Forcing or prying on the
thermostat will cause damage to the unit.
2. Place base over hole in wall and mark mounting hole
locationsonwallusingbaseasatemplate(seeFig.1).
3. Movebaseoutoftheway.Drillmountingholes.
4. Push wires through opening in thermostat base.
5. Fastenbase looselyto wallusing two mountingscrews.
Place a level against bottomof base, adjustuntil level,
andthentightenscrews.(Levelingisforappearanceonly
andwillnotaffectthermostatoperation.)Ifyouareusing
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.
6. Connect wires to terminals on base using appropriate
wiringschematic(seegs.2through4).
7. Push excess wire into wall and plug hole with a fire-resistant
material (suchas berglassinsulation)to preventdrafts
from affecting thermostat operation.
O/B TERMINAL SWITCH SELECTION
TheO/B switch onthis thermostat isfactory settothe“O”
position.This will accommodate the majority of heat pump
applications, which require the changeover relay to be
energizedinCOOL.Ifthethermostatyouarereplacingorthe
heatpumpbeinginstalledwiththisthermostatrequiresa“B”
terminal,toenergizethechangeoverrelayinHEAT,theO/B
switchmustbemovedtothe“B”position.
Mounting
Hole
Mounting
Hole
Opening
for wires
Gas/Elec
Switch
Battery
Door
O/B
Switch
Figure 1. Thermostat Base
GAS / ELEC SWITCH
Ifyoursystemisaheatpump,theGAS/ELECSwitchmustbe
settoELEC(seeFig.1)Ifyoursystemisasinglestage,the
switchmustbesettoGAS.Theswitchsettingmustagreewith
the system configuration selected in the configuration menu.
BATTERY LOCATION
“AA” Alkaline Batteries
Two“AA” alkaline batteries areinstalled inyour thermostat
with a battery tag to prevent power drainage. Prior to use,
open the battery door and remove the battery tag. To open,
pull the battery door as shown by the arrow and lift open. The
two“AA”batterieswilloperateallfunctionsormaintaintime
and continuously display the temperature during a loss of AC
power. Installed batteries will also allow programming prior to
installation. To replace batteries, pull the battery door shown
by the arrow and lift open. Using the polarity indicated inside
the battery door, insert the batteries. To close the battery door,
swing the door down while pulling in the direction of arrow.
Once fully down, snap the door back into position.
Thermostat can be powered by system AC power or Battery. If
is displayed, the thermostat is battery powered. If is not
displayed, thermostat is system powered with optional battery
back-up.Whenbatterypowerremainingisapproximatelyhalf,
the willbedisplayed.When“Change ” is displayed,
installfresh“AA”alkalinebatteriesimmediately.Forbestresults,
use new premium brand alkaline batteries such as Duracell
®
or
Energizer
®
.Werecommendreplacingbatteriesevery2years.
If the home is going to be unoccupied for an extended period
(over3months)and is displayed, the batteries should be
replacedbeforeleaving.Whenlessthantwomonthsofbattery
liferemain,thesetpointtemperaturewilloffsetby10degrees
(10degreescoolerinHeatmode/10degreeswarmerinCool
mode).Ifoffsetoccurs,thenormalsetpointcanbemanually
reset with or . Another offset will occur within two
days if batteries are not replaced. To replace the batteries, set
system to OFF.