Lennox International Inc Elite Series Gas Furnace Upflow/Horizontal Air Discharge Venting

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

Mounting Screws

FIGURE 15

UPFlow Position

UPFLOW POSITION
Top Vent Discharge
Vent Pipe
Flue	Collector Box
Transition
Pressure
Switch
Make−Up
Box
AIR	FLOW

FIGURE 16

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 clock- wise 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, pres- sure switch and or make up box as needed per the follow- ing steps and see figures 17 through 22.

1 − Remove the four mounting screws which secure the combustion air inducer / pressure switch assembly to the orifice plate. See figure 15. Lift and rotate the as- sembly 90 degrees clockwise or counter clockwise to either the 3 o’clock position or to 9 o’clock position and re−secure with four screws. 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.

UPFLOW POSITION

Left Side Vent Discharge

Cover Plate Collector Box

Pressure

Switch

	Make−Up
Vent Pipe	Box

Flue

Transition

AIR FLOW

SGas supply piping must be brought into the unit from the right side in order to accommodate the flue pipe.

SRemove 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.

SRe−secure make−up box wires, either pulling excess wires through the blower compartment and securing with supplied wire tie, or coil excess wire and secure to the gas manifold.

FIGURE 17

UPFLOW POSITION

Right Side Vent Discharge

Cover Plate

Pressure	Flue Transition
	Vent Pipe
Switch
Collector
Box
Make−Up
Box

AIR FLOW

SPressure switch tubing may be too long. Cut to fit , then re−attach to barbed fitting on pressure switch. Tubing must not be allowed to sag.

FIGURE 18

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