Lennox International Inc. GSB8-S 사용자 설명서

10

For boilers for connection to gas vents or chimneys, vent 

installations shall be in accordance with 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.

This is a very important part of your heating system. It 

must be clean, the right size, properly constructed and in 

GOOD CONDITION. No boiler can function properly with 

a bad chimney. Inspect the chimney and verify that the 

construction and size of the chimney meets all applicable 

provisions of the National Fuel Gas Code and local building 

codes. Figure 4 gives you an idea how a boiler might be 

vented to a chimney. Note that the height (HT) is measured 

from the vent pipe to the top.

Refer to Fig. 1 and Table 1 for the size and location of the 

vent (fl ue opening). Use a 28 gauge (minimum) galvanized 

pipe to connect to the chimney.

IMPORTANT - The damper blade on the furnished vent 

damper has a 1/2 square inch hole (approximately 3/4” 

diameter). On boilers equipped with standing pilot, the hole 

must be left open. On boilers equipped with intermittent 

ignition, the hole should be plugged by using the plug 

supplied with the vent damper.

Position furnished vent damper on top of fl ue outlet 

collar. Fasten damper securely to fl ue outlet collar 

with sheet metal screws. Make sure damper blade has 

clearance to operate inside of diverter. Do not modify 

draft diverter or vent damper

The damper may be installed in any horizontal or 

vertical position, closer to the fl ue outlet collar 
preferred. Follow the diagrams - Figures 6, 7 and 8.
Install the vent damper to service only the single boiler 

for which it is intended. The damper position indicator 

shall be in a visible location following installation. 

Locate the damper so that it is accessible for servicing.
The damper must be in the open position when 

appliance main burners are operating.
The boiler is equipped with a factory wired harness 

that plugs into the vent damper. The thermostat 

must be connected to the black wires marked 24 volt 

thermostat on the boiler.
Vent pipe must be same size as the fl ue outlet collar.

Slope pipe up from boiler to chimney not less than 1/4” 

per foot.
Run pipe as directly as possible with as few elbows as 

possible.
Do not connect to fi replace fl ue.

End of vent pipe must be fl ush with inside face of 

chimney fl ue. Use a sealed-in thimble for the chimney 

connection.
Horizontal run should not be longer than 3/4 the 

chimney height (HT) (Fig.5).

The sections of vent pipe should be fastened with sheet 

metal screws to make the piping rigid. Horizontal portions 

of the vent system must be supported to prevent sagging. 

Use stovepipe wires every 5’ to support the pipe from above. 

If the vent pipe must go through a crawl space, double wall 

vent pipe should be used. Where vent pipe passes through a 

combustible wall or partition, use a ventilated metal thimble. 

The thimble should be 4 inches larger in diameter than the 

vent pipe.

MINIMUM VENT PIPE CLEARANCE
Wood and other combustible materials must not be closer 

than 6” from any surface of single wall metal vent pipe. 

Listed Type B vent pipe or other listed venting systems shall 

be installed in accordance with their listing.

VENTING SYSTEM
When an existing boiler is removed from a common venting 

system, the common venting system is likely to be too large 

for proper venting of the appliances remaining connected to 

it.
At the time of removal of an existing boiler, the following steps 

shall be followed with each appliance remaining connected 

to the common venting system placed in operation, while 

the other appliances remaining connected to the common 

venting system are not in operation.

Seal any unused openings in the common venting 

system.
Visually inspect the venting system for proper size and 

horizontal pitch and determine there is no blockage or 

restriction, leakage, corrosion and other defi ciencies 

which could cause an unsafe condition.
Insofar as is practical, close all building doors and 

windows and all doors between the space in which the 

appliances remaining connected to the common venting 

system are located and other spaces of the building. 

Turn on clothes dryers and any appliance not connected 

to the common venting system. Turn on any exhaust 

fans, such as range hoods and bathroom exhausts, so 

they will operate at maximum speed. Do not operate a 

summer exhaust fan. Close fi replace dampers.
Place in operation the appliance being inspected. Follow 

the lighting instructions. Adjust thermostat so appliance 

will operate continuously.
Test for spillage at the draft hood relief opening after 

5 minutes of main burner operation. Use the fl ame of 

a match or candle, or smoke from a cigarette, cigar or 

pipe.