Lennox 80G2UH-V Installation Instructions Manual page 33

Cooling
The unit is set up at the factory for single stage cooling. For
two stage cooling operation, clip the jumper wire located
between the Y to Y2 terminals on the integrated ignition/
blower control board.
If the active dehumidification feature is enabled, the
circulating blower runs at 70% of the selected cooling
speed as long as there is a call for dehumidification.
IMPORTANT
The system must not be in either the passive or active
dehumidification mode when charging a cooling system.
Single Stage Cooling
A call for cooling from the thermostat closes the R to Y
circuit on the integrated ignition/blower control board. The
control waits for a 1-second delay before energizing the
circulating blower to 82% of the selected cooling CFM
(passive dehumidification mode). After 7.5 minutes, the
circulating blower automatically ramps up to 100% of
the selected cooling airflow. When the call for cooling is
satisfied, the circulating blower ramps down to continuous
fan cfm (38% of high stage cooling) for 45 seconds before
completely shutting down the blower.
Two Stage Cooling
A call for 1st stage cooling from the thermostat closes the
R to Y circuit on the control board. The control waits for a
1-second delay before energizing the circulating blower.
The blower motor runs at 57% of the selected air flow
for the first 7.5 minutes of the 2nd stage cooling demand
(passive dehumidification mode). After 7.5 minutes, the
blower motor runs at 70% of the selected cooling air flow
until 1st stage cooling demand is satisfied.
A call for 2nd stage cooling from the thermostat closes
the R to Y2 circuit on the control board. The blower motor
ramps up to 100% of the selected cooling air flow. When
the demand for cooling is met, the blower ramps down
to Y1 until satisfied, then ramps down to continuous fan
cfm (38% of high stage cooling) for 45 seconds before
completely shutting down the blower.
Heat Pump
For heat pump operation, clip the jumper wire located
below the O terminal on the integrated ignition/blower
control board. In heat pump mode, a call for heat will
result in the circulating air blower operating at the selected
cooling airflow after a brief ramp-up period.
507335-03 Issue 2302 Page 33 of 39