Venting - Crown Boiler AWR038 Installation Instructions Manual

•
If motorized louvers are installed in the openings to the outdoors, they must be interlocked to prevent operation of
the fuel burning appliances in the boiler room unless the louvers are open.
A mechanical system may be used to bring all combustion air to the boiler which meets all of the following requirements:
1) The system must be manufactured specifically for this purpose.
2) Size the system to deliver combustion air at the rate prescribed by the system manufacturer's instructions, but no less
than 0.35 CFM for each 1000 BTU/hr of the combined input of all fuel burning appliances in the boiler room. If
exhaust fans are present within the building, additional capacity may be required to prevent the boiler room from being
depressurized.
3) The system must be interlocked to prevent operation of the fuel burning appliances in the boiler room if the system is not
operating.
• IMPROPER VENTING MAY RESULT IN PROPERTY DAMAGE AND/OR THE RELEASE OF
FLUE GASES, WHICH CONTAIN DEADLY CARBON MONOXIDE (CO), INTO THE HOME,
WHICH CAN CAUSE SEVERE PERSONAL INJURY OR DEATH.
• DO NOT USE PLASTIC VENTING MATERIALS (SUCH AS CPVC, PVC AND RADEL) TO VENT
THIS BOILER.
• INSPECT EXISTING CHIMNEY BEFORE INSTALLING BOILER. FAILURE TO CLEAN OR
REPLACE DAMAGED PIPE OR TILE LINING WILL CAUSE SEVERE INJURY OR DEATH.
The vent system installation must be in accordance with local codes, or in the absence of such codes, the National Fuel Gas
Code (NFPA 54/ANSI Z223.1). In Canada, refer to the Natural Gas and Propane Installation Code (CAN/CSA 149.1).
A typical vent installation is illustrated by Figure 6.1. The components of vent installation are boiler draft diverter, vent
damper, vent connector and chimney. The AWR series boilers are equipped with a draft hood which is built into the boiler; do
not attempt to install an external draft hood.
1) Acceptable Chimneys - The following chimneys may be used to vent AWR series boilers:
•
Listed Type B or L gas vent - Install in accordance with the manufacturer's instructions, the terms of its listing, and
applicable codes.
•
Masonry Chimney - The masonry chimney must be constructed in accordance with local codes, or in the absence of
any, the Standard for Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances (NFPA 211). The chimney
must be lined with a clay liner or other listed lining system. Do not vent an AWR series boiler into an unlined
chimney.
2) Acceptable Vent Connectors - The following may be used for vent connectors:
•
Listed type B or L Gas Vent
•
Single Wall Galvanized Pipe - Use 0.018" (26 gauge or heavier). The size and location of the chimney may not
permit the use of a single wall connector in some cases. (see the National Fuel Gas Code). Do not use single wall
pipe for vent connectors in attics.
•
Other Vent Connectors Permitted by the National Fuel Gas Code.
3) Chimney and Vent Connector Sizing - Size the chimney and vent connector in accordance with the National Fuel Gas
Code.
Mechanical Combustion Air Supply
VI Venting
WARNING
10