Heat - Using The Heat Mode; Cool - Using The Cool Mode - Lennox ComfortSense 3000 Series Operation Manual

HEAT - Using the Heat Mode

Enabling and Disabling Heat Mode
The thermostat must be in the HEAT mode to control the
heating equipment. Press the Heat button to enable or
disable HEAT mode. If the thermostat is in COOL or OFF
mode, pressing the Heat button enables the HEAT mode
(indicated by HEAT in the SYSTEM box - see figure 4).
Figure 4. Turn Heat ON/OFF
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.
Figure 5. Heat/Cool Mode Disabled
Heating Demand
Set the thermostat to heat mode to control the heating
equipment. Then, if the room temperature is lower than the
temperature setpoint, as shown in figure 6, the thermostat
detects a heating demand and will activate the heating
equipment to satisfy the demand.
Figure 6. Heating Demand
Heating operation is indicated by a flame icon in the
SYSTEM box. 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 heating equipment has been turned off.
If your system supports 2-stage heating (as does the
L3522C thermostat), you may notice various heating levels
being delivered during a demand.
NOTE: Heating equipment is activated for at least 3 minutes
if no buttons are pressed during the demand interval.

COOL - Using the Cool Mode

Enabling and Disabling Cool Mode
Use the COOL button to enable or disable cool mode as
desired. If the thermostat is in HEAT or OFF mode, cool
mode is enabled when the COOL button is pressed. This is
indicated by COOL in the SYSTEM box (see figure 8).
Figure 7. Turn Cool ON/OFF
If the thermostat is in cool mode, pressing the Cool button
disables COOL mode (indicated by OFF in the SYSTEM
box - see figure 5).
Cooling Demand
Set the thermostat to cool mode to control the cooling
equipment. Then, if the room temperature is higher than the
temperature setpoint, as shown in figure 8, the thermostat
detects a cooling demand and will activate the cooling
equipment to satisfy the demand.
Figure 8. Cooling Demand
Cooling operation is indicated by flashing "snowflake" icons
in the SYSTEM box. When the actual temperature drops
below the temperature setpoint, the snowflake icons will
disappear. This indicates that the cooling demand has been
satisfied and that the cooling equipment has been turned
off.
If your system supports 2-stage cooling (as does the
L3522C thermostat), you may notice various cooling levels
being delivered during a demand. Also, if a small cooling
demand is present, "Lo" will be displayed in the SYSTEM
box. However, if a large cooling demand is present, "Hi" will
be displayed in the SYSTEM box (shown in figure 8).
NOTE: If no buttons are pressed during a demand for
cooling, the equipment must operate for at least 4
minutes. After a demand has been satisfied, cooling
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