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506079−01 02/08
ROOM
FAN
AUTO
SYSTEM
HEAT
70
Figure 2. Display − Home Screen
Figure 2 illustrates the HOME screen. Note that an indoor
room temperature of 70°F is initially displayed. After about
1 minute of warm−up time, the actual room temperature will
be displayed. HEAT mode is the system default (as indi-
cated in the SYSTEM box at lower right).
A pale blue display backlight will turn on each time a key is
pressed. The backlight will turn off 8 seconds after the last
key is pressed.
Heating Control
The HEAT button is located behind the small door on the
right−hand side of the thermostat. See figure 3.
Figure 3. Additional Thermostat Buttons
Enabling and Disabling Heat Mode
Use the HEAT button to enable or disable heat mode as
desired. If the thermostat is in off mode, heat mode is en-
abled when the HEAT button is pressed. This is indicated
by HEAT in the SYSTEM box as shown in figure 4.
ROOM
SETPOINT
FAN
AUTO
SYSTEM
HEAT
69
64
Figure 4. Heat Mode Enabled
If the thermostat is in heat mode, heat mode is disabled
when the HEAT button is pressed. This is indicated by OFF
in the SYSTEM box as shown in figure 5.
ROOM
SETPOINT
FAN
AUTO
SYSTEM
OFF
69
64
Figure 5. Heat Mode Disabled
Heating Demand
The thermostat must be in heat mode in order to properly
control the heating equipment. When in heat mode, if the
actual temperature is lower than the temperature setpoint, a
heating demand is detected by the thermostat. The thermo-
stat will then activate the heating equipment to satisfy the de-
mand. Heating operation is indicated by a flame icon in the
SYSTEM box as shown in figure 6.
ROOM
FAN
AUTO
SYSTEM
HEAT
72
88
Figure 6. Heating Demand
When the actual temperature rises above the temperature
setpoint, the flame icon will disappear. This indicates that
the heating demand has been satisfied and that the heat-
ing equipment has been turned off.
NOTE − The heating equipment is activated for at least 3
minutes if no buttons are pressed during the demand inter-
val.
Cooling Control
The COOL button is located behind the small door on the
right-hand side of the thermostat. See figure 3.
Enabling and Disabling Cool Mode
Use the COOL button to enable or disable cool mode as
necessary. If the thermostat is in off mode, cool mode is
enabled when the COOL button is pressed. This is indi-
cated by COOL in the SYSTEM box.
If the thermostat is in cool mode, cool mode is disabled
when the COOL button is pressed. This is indicated by
OFF in the SYSTEM box.