5
4
Operating Your Thermostat
Setting the System Control Mode
TheSystemControlhasseveralmodesofoperationthatcanbeselectedby
movingtheSYSTEMswitchtooneofthreepositions.
COOL Onlyyourcoolingsystemwilloperate
OFF Heatingandcoolingsystemsareoff.
HEAT Onlyyourheatingsystemwilloperate.
Additional Switch Position (Model BT21NP Only):
EMER Operatesabackupheatsource(EmergencyHeat)forheatpump
systemsonly.
NOTE:
If your model BT21NP was set to a
con-
ventional system (NORM) then you will not have the
EMER (emergency heat) option and “NO AUX SET”
will flash in the display if EMER is selected
with the
system switch.
Setting the Fan Control Mode
The Fan Control has 2 modes of operation – AUTO and ON. The mode can
be selected by moving the FAN switch to the appropriate position.
AUTO Thesystemfanwillrunonlywhenyourheatingorcooling
systemisrunning.
ON Thesystemfanwillstayon.
Temperature Adjustment
Presstheorbuttontoadjustthecurrentsetpointtemperature.
Status Indicators
Statusindicatorsappearinthedisplaytoletyou
knowifyoursystemisheating,coolingoroff.
HEAT
Ifashing,indicatesyourheatingsystem
isrunning.
COOL
Ifashing, indicatesyourcoolingsystem
isrunning.
Additional Status Indicators (Model BT21NP Only):
AUX Indicatesthattheauxiliarystageofheatingisrunning
(Multi-StageSystemsonly),orthattheemergencyheat
systemisrunning(heatpumpsystemsonly).
Resetting the Thermostat
Thisthermostatprovidesyouwitharesetbuttonthatwilleraseallofyour
usersettings.
Toresetthethermostat,useasmallobjectsuchasatoothpickorpaper-
clipandgentlypressthebuttonlocatedinsidethesmallholeonthefrontof
thethermostathousinglabeled“reset”.