ECR Dunkirk PVWB Series, Manual

8

CHIMNEY AND VENT PIPE CONNECTION

For boilers for connection 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 applicable provisions of local building codes.

CHECK YOUR CHIMNEY

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. 

CHIMNEY SIZING

Install vent in accordance with “Venting of Equipment” 

of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, 

or applicable provisions of local building codes.

CONNECTING THE VENT DAMPER AND VENT 

CONNECTOR

Refer to fi gure on page 2 for size and location of vent 

(fl ue opening). 
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 

1. 

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 either draft diverter or 

vent damper during installation.

On 2 section boilers equipped with vent damper, 

supplied 4-inch vent damper is equipped with 

3-inch to 4-inch adapter so that 4-inch vent 

damper may be installed on boiler’s 3-inch fl ue 

outlet collar. Fasten all fi ttings securely.

As An Option

Damper may be installed in any horizontal or ver-

tical position, closer to fl ue outlet collar preferred. 

Follow diagrams - Figures #9, #10 and #11.

Install vent damper to service only single boiler 

2. 

for which it is intended. Damper position indicator 

shall be in visible location following installation. 

Locate damper so that it is accessible for 

servicing.

Damper must be in open position when appliance 

3. 

main burners are operating.

Boiler is equipped with factory wired harness that 

4. 

plugs into vent damper.

Vent pipe must be same size as the fl ue outlet 

5. 

collar, except 2 section boilers with vent damper 

as noted above. 

Slope pipe up from boiler to chimney not less 

6. 

than 1/4” per foot.

Run pipe as directly as possible with as few el-

7. 

bows as possible.

Do not connect to fi replace fl ue.

8. 

End of vent pipe must be fl ush with inside face 

9. 

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

chimney connection.

Sections of vent pipe should be fastened with sheet 

metal screws to make piping rigid. Support horizon-

tal potions of vent system to prevent sagging. Use 

stovepipe wires every 5’ to support pipe from above. 

If vent pipe must go through crawl space, double wall 

vent pipe should be used. Where vent pipe passes 

through combustible wall or partition, use ventilated 

metal thimble. Thimble should be 4 inches larger in 

diameter than vent pipe.