Lennox A80UH1E Installation Instructions Manual page 32

Fan Control
The fan on time of 45 seconds is not adjustable. The heat
fan off delay (amount of time that the blower operates after
the heat demand has been satisfied) may be adjusted by
changing the jumper position across the five pins on the
integrated control. The unit is shipped with a factory fan off
delay setting of 90 seconds. The fan off delay affects comfort
and is adjustable to satisfy individual applications. Adjust
the fan off delay to achieve a supply air temperature between
90° and 110° F at the moment that the blower is deenergized.
Longer off delay settings provide lower return air
temperatures; shorter settings provide higher return air
temperatures. See Figure 37.
HEAT FAN OFF TIME IN SECONDS
Figure 37
Constant Torque Motor
These units are equipped with a constant torque ECM motor.
It has a DC motor coupled to an electronic control
module,both contained in the same motor housing.The motor
is programmed to provide constant torque at each of the
five selectable speeds.The motor has five speed taps.Each
tap requires 24 volts to energize.
Thermostat Heat Anticipation
Set the heat anticipator setting (if adjustable) according to
the amp draw listed on the wiring diagram that is attached
to the unit.
Page 32 of 42
NOTE: Do not secure the electrical conduit directly to the
air ducts or structure.
Electrical
1. Check all wiring for loose connections.
2. Check for the correct voltage at the furnace (furnace
operating). Correct voltage is 120VAC ± 10%.
3.Check amp-draw on the blower motor with inner blower
panel in place.
Unit Nameplate__________ Actual _______________
Blower Speeds
Follow the steps below to change the blower speeds.
1. Turn off electrical power to furnace.
2. Remove blower access panel.
3. Disconnect existing speed tap at integrated control
speed terminal.
NOTE: Termination of any unused motor leads must be
insulated.
4. Place unused blower speed tap on integrated control
"PARK" terminal or insulate.
5. Refer to blower speed selection chart on unit wiring
diagram for desired heating or cooling speed. See
Blower performance data beginning on the next page.
6. Connect selected speed tap at integrated control speed
terminal.
7. Resecure blower access panel.
8. Turn on electrical power to furnace.
9. Recheck temperature rise.
Issue 1132 506842-01