Heating Control - Lennox ComfortSense 3000 Series Operation Manual

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 indicated
in the SYSTEM box at lower right).
A pale blue display backlight turns on each time a key is
pressed; then 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 select normal heat mode, emergency
heat mode, or to disable heat modes as desired. If the
thermostat is in off mode, normal heat mode is enabled
when the HEAT button is pressed. This is indicated by
HEAT in the SYSTEM box as shown in figure 4.
.
Figure 4. Heat Mode Enable
If the thermostat is in emergency heat mode when the HEAT
button is pressed, then heat modes are disabled. This is
indicated by OFF in the SYSTEM box as shown in figure 5
Figure 5. Heat Mode Disabled
Heating Demand
The thermostat must be in either normal or emergency heat
mode in order to properly control the heating equipment.
When in either heat mode, if the actual temperature is lower
than the temperature setpoint, a heating demand is detected
by the thermostat. The thermostat will then activate the
heating equipment to satisfy the demand. Heating operation
is indicated by a flame icon in the SYSTEM box as shown
in figure 6.
Figure 6. Heating Demand
2