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SECTION 2
EXE-IOM-230112
5. If the maximum positive pressure loss is exceeded, the boiler may have
to be de-rated or require the installation of draft accessories such as
an engineered exhaust assist fan to prevent operational issues from
occurring. If the maximum negative pressure is exceeded due to excessive
natural draft (stack effect), the exhaust system may require the use of
draft accessories such as a fixed-position balancing baffle or modulating
overdraft damper. Draft accessories must be appropriate for Category II/
IV installations and are not included with the boiler. Consult your venting
supplier for recommendations.
6. Adhere to local and jurisdictional codes and regulations, which may differ
from recommendations and diagrams contained in this manual.
7. Site specific conditions not addressed in this manual may require
additional precautions or design considerations. Consult your local Fulton
Representative and venting supplier for recommendations.
NOTE:
Consult your venting pipe supplier for assistance with sizing of vent
–
materials and other potentially required accessories.
8. The layout of the piping used for air intake and exhaust must be done in a
way that facilitates smooth travel and natural flow.
9. A pressure drop calculation is an acceptable method for evaluating
theoretical draft, but is not enough information to fully validate
combustion air intake and flue gas exhaust vent systems. The designer and
installer must use good practice and remain cognizant of important factors
that cannot be captured by a pressure drop calculation such as local code
requirements, accessibility for inspection and maintenance, aesthetic
concerns, flue gas recirculation, stagnant vapor plumes, prevailing wind
direction, nearby mechanical equipment and other design considerations
as detailed in this manual. Some recommendations:
ƒ
Avoid sharp turns, boot tees, bullhead tees, back-to-back 90
degree elbows, and short radius elbows.
Avoid extensive direction changes (flue gases being required
ƒ
to turn around).
Never direct flue stacks in a downward direction.
ƒ
Combustion Air Intake
Adhere to the folllowing for installation:
1. It is the responsibility of the designer and installer of the venting system to
guarantee the prevention of flue gas recirculation. This includes particular
care to prevent flue gases being drawn into a boiler's combustion air
supply, or flue gases moving backward through an idle boiler.
2. Under no circumstances should the boiler room be under a negative
pressure. The boiler room must be maintained at a neutral pressure relative
to the outdoors. Avoid the use of room exhaust fans and ensure other
equipment such as compressors, clothes dryers, air handling units and
water heaters will not create a negative pressure space. A negative boiler
room can create down draft in the stack, affect gas regulation, or restrict
the burner's air supply, resulting in poor combustion or life safety hazard.
Questions? Please Contact Your Local Manufacturer's Representative
INSTALLATION
!
WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct, and strict
adherence to applicable jurisdictional/
professional codes and regulations.
4
CAUTION
Ensure there is not a negative pressure in the
boiler room. The boiler room pressure must
be neutral relative to the outdoors.
Particulate matter or chemicals (example:
chlorine, fluorine, perchlorethylene,
halogenated compounds) in the
combustion air supply to the boiler will
cause damage or failure to the burner.
High-risk situations for particulate matter
to be in the air include construction and
maintenance activities. See Table 5.
2-19
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