Dunkirk DWB Series - Manual (Page 15)

15
6 - COMBUSTION AIR AND VENT PIPING - CATEGORY I (CHIMNEY VENT)
6.1 Check Your Chimney
Chimney must be clean, right size, properly constructed
and in GOOD CONDITION.
1. Installation must conform to requirements of the
authority having jurisdiction or, in absence of such
requirements, to the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and/or Natural Gas and Propane
Installation Code, CAN/CSA B149.1.
2.
Increaser fi tting is required on this boiler for Category I
venting, and 4” is minimum permissible vent diameter.
This does not imply vent connector is intended to be 4”
diameter pipe. Vent connector shall be sized according
to appropriate venting tables in the National Fuel
Gas Code and may be required to be larger than 4”
diameter.
NOTICE
Boiler installation for chimney venting is not
complete unless increaser fi tting is located and
secured.
3.
Venting into masonry chimney without liner, line
chimney from top to bottom with either:
A. Listed Type B vent pipe
B. Listed fl exible vent liner
C. Poured ceramic liner.
4.
Outside chimneys should not be used unless they are
(choose one of the following):
A. Enclosed in a chase
B. Lined with Type B vent pipe
C. Use listed fl exible vent liner
D. Use certifi ed chimney lining system
5.
Vent connector from boiler to chimney should run as
directly as possible with as few elbows as possible.
6. Common venting shall not be allowed. Boiler and
other certifi ed appliances. appliances can share same
chimney vent. Consult appropriate Vent Sizing Tables
in National Fuel Gas Code for specifi c requirements of
multiple appliance venting.
7. Boiler is only appliance connected to vent, Type B vent
pipe is recommended for vent connector.
8.
Slope pipe up from boiler to chimney not less than 1/4”
per foot (21mm/m).
9.
End of vent pipe must be fl ush with inside face of
chimney fl ue. Use sealed-in thimble for chimney
connection.
10.
Fasten sections of vent pipe with sheet metal screws to
make piping rigid. Use stovepipe wires to support pipe
from above.
11.
Do not connect to fi replace fl ue.
12. Do not install damper on this boiler.
Figure 10 - Combustion Air Fitting
3”
3”
Horizontal Venting requires fi eld supplied appliance adapter
for the boiler fl ue outlet.
Boiler is provided with a 3” vent connection, 3” x 4”
increaser must be fi eld sourced for chimney application.
This does not mean that the connection to the chimney will
always be 4”.
WARNING
Boiler and venting installations shall be performed
by a qualifi ed 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 fi re or to asphyxiation from poisonous gases such
as carbon monoxide with is odorless and invisible.
!
WARNING
Do not connect boiler to any portion of mechanical
draft system operating under positive pressure.
!