Venting - Lennox A80UH1E Installation Instructions Manual

Venting

A 4 inch diameter flue transition is factory installed on the
combustion air inducer outlet of all models. Figure 16 shows
the combustion air inducer as shipped from the factory.
Mounting Screws Location
UPFLOW POSITION
Top Vent Discharge
IMPORTANT
The unit will not vent properly with the flue transition
pointed down in the 6 o'clock position.
The combustion air inducer may be rotated clockwise
or counterclockwise by 90° to allow for top or side vent
discharge in all applications. When the unit is installed,
the flue transition must be in the 9 o'clock, 12 o'clock or
3 o'clock position.
If necessary reposition the combustion air inducer, pressure
switch and/or make-up box as needed per the following
steps. See Figures 16 through 22.
506842-01
Figure 15
Figure 16
1. Remove the four mounting screws (Figure 15) which
secure the combustion air inducer / pressure switch
assembly to the orifice plate. Lift the assembly and rotate
it 90° clockwise or counter clockwise to either the 3
o'clock position. Resecure with four secrews. Gasket
should be left in place.
2. Use tin snips to cut preferred opening on the cabinet for
repositioning the flue outlet. Use the cut-out piece as a
cover plate to patch unused opening on cabinet.
• Gas supply piping must be brought into the unit from the right side in
order to accommodate the flue pipe.
• Cut combustion air inducer tubing from 9" to 8" to avoid interference with
inducer motor.
• Remove make-up box assembly (2 screws) and cut wire tie to free make-
up box wires. Re install make-up box on other side of cabinet.
• Resecure make-up box wires: Either pull excess wires through the blower
companrtment and secure using supplied wire tie, or coil excess wire and
secure to the gas manifold.
Right Side Vent Discharge
• Cut combustion air inducer tubing from 9" to 5" to avoid interference with
inducer motor.
Issue 1132
UPFLOW POSITION
Left Side Vent Discharge
Figure 17
UPFLOW POSITION
Figure 18
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