6
APPENDIX B – VENTING
VENT THIS BOILER according to the instructions. Failure to do so may cause products of
combustion to enter the building resulting in severe property damage, personal injury or death.
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Install this boiler according to this manual and the National Fuel Gas Code, ANSI Z223.1/NFPA 54,
the Natural Gas and Propane Installation Code, CAN/CSA B149.1, or applicable provisions of the
local building codes. Contact local building or fire officials about restrictions and installation
inspection in your area.
This Appendix consists of two sections (B2, and B3). Refer to the section appropriate for the type of boiler
you are installing or servicing.
B2 Direct Vent “Direct vent” is also called “sealed combustion”. All combustion air is drawn from
outside the building directly into the boiler. The boiler vents vertically or horizontally, assisted by a fan in
the boiler. Gas vent must resist temperature and corrosion and be sealed against leakage of flue gases
and condensate. Approved materials include AL29-4C stainless steel, polypropylene, CPVC and PVC,
depending on the boiler. Combustion air provided by a separate PVC or galvanized steel pipe, or by the
combustion air pipe in a concentric polypropylene vent system.
B3 Power Vent Similar to Direct Vent, but some or all combustion air is drawn from inside the building.
May draw air directly from the boiler room without the use of a combustion air pipe.
If you are removing an existing boiler
from a gas
vent or chimney that is also used to vent other gas
appliances:
1.
Seal any unused openings in the
common venting system.
2.
Visually inspect the venting system
for proper size and horizontal pitch
and determine there is no blockage
or restriction, leakage, corrosion, and
other deficiencies which could cause an
unsafe condition.
3.
Resize the common venting system
to approach the minimum size as
determined using the
National Fuel Gas
Code
, ANSI Z223.1 and/or CAN/CSA
B149.1,
Installation Codes
.
4.
Check the draft of each remaining
appliance using the procedure described
in Appendix G, checking draft and
combustion.
5.
Correct any draft problems before placing
the gas appliances back into service.
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In addition to previously mentioned
vent codes of the main general guidelines,
atmospheric vented installations must
also be in accordance with the Standard for
Chimneys, Fireplaces, Vents and Solid Fuel
Burning Appliances, ANSI/NFPA 211. For Canada
installations, refer to the National Gas and LP
Installation Code, CAN/CSA B149.1.
Summary of Contents for ESC
Page 6: ... Figure S 1 Minimum Clearances to Combustibles SPECIFICATIONS continued ...
Page 30: ...30 Internal Wiring Figure IW 1 Wiring Diagram ...
Page 31: ...31 Internal Wiring continued Figure IW 2 Wiring Diagram ...
Page 37: ...37 APPENDIX B1 INTENTIONALLY OMITTED ...
Page 50: ...50 Figure D 0 Piping Schematic Symbols APPENDIX D System Piping continued ...
Page 62: ...62 SERVICE RECORD DATE SERVICE PERFORMED ...
