Lennox International Inc SL280UH090V48B, SL280UH070V36A, SL280UH090V36B installation instructions

SINGLE appliance venting of a fan-assisted furnace into a tile-lined masonry chimney (interior or outside wall) is PROHIBITED. The chimney must first be lined with either type B1 vent or an insulated single wall flexible vent lining system which has been sized ac- cording to the provided venting tables and the vent pipe manufacturer’s instructions.

Common Venting Using Tile−Lined Interior Masonry Chimney and Combined Vent Connector

MINIMUM LENGTH = AS SHORT AS PRACTICAL.

FOR MAXIMUM LENGTH SEE NOTE TO LEFT

NOTE− Refer to provided venting tables for installations.

VENT

CONNECTOR

OTHER

APPLIANCE

FURNACE

AIR FLOW

INTERIOR TILE−LINED

MASONRY CHIMNEY

NOTE − the chimney must be properly sized per provided venting tables or lined with listed metal lining system.

PERMANENTLY

SEALED FIREPLACE

OPENING

FIGURE 24

DO NOT insulate the space between the liner and the	Never connect a Category I appliance to a chimney that is
chimney wall with puffed mica or any other loose gran-	servicing a solid−fuel appliance. If a fireplace chimney flue
	is used to vent this appliance, the fireplace opening must
ular insulating material
	be permanently sealed.
IMPORTANT	A type B or listed chimney lining system that passes
	through an unused masonry chimney flue is not considered

to be exposed to the outdoors.

A fan−assisted furnace may be commonly vented into an existing lined masonry chimney if the following conditions are met:

SThe chimney is currently serving at least one drafthood equipped appliance

SThe vent connectors and chimney are sized according to the provided venting tables.

If type B1 double-wall vent is used inside a chimney, no oth- er appliance can be vented into the chimney. The outer wall of type B1 vent pipe must not be exposed to flue products. A type B1 vent or masonry chimney liner shall terminate above the roof surface with a listed cap or a listed roof as- sembly according to the terms of their respective listings and the vent manufacturer’s instructions.

When inspection reveals that an existing chimney is not safe for the intended purpose, it shall be rebuilt to conform to nationally recognized standards, lined or relined with suitable materials, or replaced with a gas vent or chimney suitable for venting SL280UHV series units. The chimney passageway must be checked periodically to ensure that it is clear and free of obstructions.

Do not install a manual damper, barometric draft regulator, or flue restrictor between the furnace and the chimney.

General Venting Requirements

Vent all SL280UHV furnaces according to these instruc- tions:

1 − Vent diameter recommendations and maximum allow- able piping runs are found in the provided venting tables.

2 − In no case should the vent or vent connector diameter be less than the diameter specified in the provided venting tables.

3 − The minimum vent capacity determined by the sizing tables must be less than the low fire input rating and the maximum vent capacity must be greater than the high fire input rating.

4 − Single appliance vents − If the vertical vent or tile-lined chimney has a larger diameter or flow area than the vent connector, use the vertical vent diameter to de- termine the minimum vent capacity and the vent connector diameter to determine the maximum vent capacity. The flow area of the vertical vent, however, shall not exceed 7 times the flow area of the listed ap- pliance categorized vent area, drafthood outlet area or flue collar area unless designed according to approved engineering methods.

5 − Multiple appliance vents − The flow area of the largest section of vertical vent or chimney shall not exceed 7 times the smallest listed appliance categorized vent area, drafthood outlet area or flue collar area unless de- signed according to approved engineering methods.

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