Lennox International Inc GWB8-280E-2 Chimney and Vent Pipe Connection, Check Your Chimney

7 - CHIMNEY AND VENT PIPE CONNECTION

!WARNING

Boiler and venting installations shall be performed by a qualified expert and in accordance with the appropriate manual. Installing or venting boiler or other gas appliance with improper methods or materials may result in serious injury or death due to fire or to asphyxiation from poisonous gases such as carbon monoxide with is odorless and invisible.

Boilers connecting to gas vents or chimneys, vent installations shall be in accordance with “Venting of Equipment”, of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 or “Venting Systems and Air Supply for Appliances,” of the Natural Gas and Propane Installation Code, CAN/CSA B149.1, or applicable provisions of the local building codes.

Check Your Chimney

It must be clean, right size, properly constructed and in good condition.

Chimney Sizing

Chimney sizing, and vent installation must be in accordance with The National Fuel Gas Code, ANSI Z223.1/NFPA 54 or CAN/CSA B149.1, or applicable provisions of local building codes.

This is a high efficiency boiler with low stack temperature. Following recommendations are in addition to requirements of the National Fuel Gas Code.

1.Type B double wall vent pipe is recommended for vent connector. Single wall vent connectors should not be used unless following conditions are true:

a)Except for basement, boiler is not installed in unheated space.

b)Total horizontal portion of vent connector, not including elbows is less than 5 feet in length.

2.Outside chimneys (i.e. chimneys exposed to outdoors below roof line) should not be used unless they are:

a)enclosed in a chase, or

b)lined with type B vent pipe, or listed flexible vent liner, or other certified chimney lining system.

3.Where possible it is recommended to common vent boiler and water heater.

4.For multiple boiler installations, consult boiler manufacturer for venting recommendations.

Connecting The Vent Damper And Vent Connector

Refer to Figure 1, page 2 for size and location of vent (flue opening).

NOTICE

Damper blade on furnished vent damper has 1/2 square inch hole (approximately 3/4” diameter). Boilers equipped with intermittent ignition, hole should be plugged by using plug supplied with vent damper.

1.Position furnished vent damper on top of flue outlet collar. Fasten damper securely to flue outlet collar with sheet metal screws. Verify damper blade has clearance to operate inside of diverter. Do not modify either draft diverter or vent damper during installation.

As An Option

Damper may be installed in horizontal or vertical position, closer to flue outlet collar preferred. See Figures 8, 9 and 10 and enclosed vent damper instructions.

2.Install vent damper to service only single boiler for which it is intended. Damper position indicator shall be in visible location following installation. Locate damper so it is accessible for servicing. See Figure 9.

3.Damper must be in the open position when appliance main burners are operating.

4.Boiler is equipped with factory wired harness that plugs into vent damper.

5.Slope pipe up from boiler to chimney not less than 1/4” per foot.

6.Run pipe as directly as possible with as few elbows as possible.

7.Do not connect to fireplace flue.

8.End of vent pipe must be flush with inside face of chimney flue. Use a sealed-in thimble for chimney connection.

Fasten sections of vent pipe with sheet metal screws to make piping rigid. Support horizontal potions of vent system to prevent sagging. Use stovepipe wires every 5’ to support pipe from above. Use double wall vent pipe if vent pipe must go through crawl space. Where vent pipe passes through combustible wall or partition, use ventilated metal thimble. Thimble should be 4 inches larger in diameter than vent pipe.

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