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Figure 14: Horizontal Vent Exhaust and Air Intake Clearance
5.
If the vent exhaust and air intake are positioned on
the same elevation, the minimum horizontal
distance between the two must be at the least, 24"
(48" in colder climates).
6.
Vent outlet MUST NOT terminate below a forced
air inlet at any distance.
7.
Vent cannot terminate below grade. Position vent
termination where vapours will not damage walls
or plants or may be otherwise objectionable.
8.
Vent terminal shall not be installed closer than 3
feet (1m) from an inside corner of an L-shaped
structure, window well, stairwell, alcove, courtyard
or other recessed area as wind eddies could affect
boiler performance or cause recirculation.
9.
DO NOT terminate closer than 4 feet (1.25m)
horizontally and vertically from any electric meter,
gas meter, regulator, relief valve, or other
equipment. In all cases local codes take
precedence.
10. Position terminations so they are not likely to be
damaged by foreign objects, or exposed to a build-
up of debris.
11. Vent piping must terminate in an elbow pointed
outward or away from air inlet.
12. Flue gas condensate can freeze on exterior walls
or on the vent cap. Frozen condensate on the vent
cap can result in a blocked flue condition. Keep the
vent cap/terminal clear of snow, ice, leaves, debris
etc. Some discolouration to exterior building
surfaces is to be expected. Adjacent brick or
masonry surfaces should be protected with a rust
resistant sheet metal plate.
13. Perform regularly scheduled inspections to ensure
vent terminal is unobstructed.
DO
NOT
OPERATE
TERMINAL CAP REMOVED AS THIS MAY RESULT IN
THE
RECIRCULATION
WATER MAY ALSO FLOW INTO THE COMBUSTION
AIR PIPE AND INTO THE BURNER ENCLOSURE.
Optional Room Air
The Valiant may also be installed utilizing room air for
combustion while venting out the combustion products to
the outside with a piped vent exhaust.
When utilizing room air, it is important to properly size the
mechanical room openings to ensure an adequate
combustion air supply to the boiler.
Installation must conform to the latest edition of the
National Fuel Gas Code, ANSI Z223.1/NFPA54, and/or
Natural Gas and Propane Installation Code, CAN/CSA
B149.1
IN GENERAL
The operation of exhaust fans, compressors, air handling
units etc. can rob air from the room, creating a negative
pressure condition leading to reversal of the natural draft
action of the venting system. Under these circumstances an
engineered air supply is necessary.
If the appliance is to be installed near a corrosive or
potentially corrosive air supply, the appliance must be
isolated from it and outside air supplied as per code.
Potentially corrosive atmospheres will result from exposure
to permanent wave solution, chlorinated waxes and
cleaners, chlorine, water softening chemicals, carbon
tetrachloride, halogen based refrigerants, Freon cleaning
solvents, hydrochloric acid, cements and glues, masonry
washing materials, antistatic fabric softeners, dry cleaning
solvents, degreasing liquids, printing inks, paint removers,
etc.
The equipment room MUST be provided with properly sized
openings to assure adequate combustion air and proper
ventilation when the unit is installed with a proper venting
system.
7
CAUTION
APPLIANCE
WITH
OF
FLUE
PRODUCTS.
WARNING
THE
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