Lennox EL180UHE Installation Instructions Manual page 24

Thermostat
Install the room thermostat according to the instructions
provided with the thermostat. See figure 29 for thermostat
designations. If the furnace is being matched with a heat
pump, refer to the FM21 installation instruction or appro-
priate dual fuel thermostat instructions.
Indoor Blower Speeds
EL180UHE Schematic Wiring Diagram
Figure 29
Page 24
1 - When the thermostat is set to "FAN ON," the indoor
blower will run continuously on the fan speed when
there is no cooling or heating demand.
2 - When the EL180UHE is running in the heating
mode, the indoor blower will run on the heating
speed.
3 - When there is a cooling demand, the indoor blower
will run on the cooling speed.