Exhaust Vent And Intake Air Vent; Prevent Combustion Air Contamination - Heat Transfer MODCON VWH 300 LP Installation & Maintenance

PART 3: PREPARE BOILER LOCATION
E. EXHAUST VENT AND INTAKE AIR VENT
n
WARNING
Vents must be properly supported. The Mod
Con's Intake and Exhaust Connections are not
designed to carry heavy weight. Vent support
brackets must be within 1 foot of the boiler and
the balance at 4 foot intervals. The Mod Con
venting must be readily accessible for visual
inspection for the first three feet from the boiler.
The Mod Con Boiler requires a special vent sys-
tem, designed for pressurized venting. Mod Con
Boilers are rated ANSI Z21.13 Category IV (pres-
surized vent, likely to form condensate in the
vent).
You must also install air intake piping from out-
doors to the boiler flue adaptor. The resultant
installation is categorized as direct vent (sealed
combustion). Note: To prevent combustion
air contamination see Table 3-2 in this
section when considering exhaust vent
and intake air vent termination.
Intake and exhaust must terminate near each
other and may be vented vertically through the
roof or out a side wall. The intake and exhaust
venting methods are detailed in the Venting
Section. Do not attempt to install the Mod Con
Boiler using any other means. Be sure to locate
the boiler such that the air intake and exhaust
vent piping can be routed through the building
and properly terminated. The air intake and
exhaust vent piping lengths, routing and termi-
nation method must all comply with the methods
and limits given in the venting section.
F. PREVENT COMBUSTION AIR
CONTAMINATION
Install intake air piping for the Mod Con Boiler as
described in the Venting section. Do not termi-
nate exhaust in locations that can allow contam-
ination of intake air.
GAS-FIRED HOT WATER SUPPLY BOILER
(CONTINUED)
n
WARNING
You must pipe outside air to the boiler air
intake. Ensure that the intake air will not
contain any of the contaminants below.
Contaminated air will damage the boiler,
resulting in possible severe personal injury,
death or substantial property damage. For
example, do not pipe intake air vent near a
swimming pool. Also avoid areas subject to
exhaust fumes from laundry facilities. These
areas will always contain contaminants.
Table 3-2: Corrosive contaminants and sources
Products to avoid
Spray cans containing fluorocarbons
Permanent wave solutions
Chlorinated waxes/cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for thawing
Sodium chloride used for water softening
Refrigerant leaks
Paint or varnish removers
Hydrochloric acid/muriatic acid
Cements and glues
Antistatic fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, and cleaning
solvents found in household laundry rooms
Adhesives used to fasten building products and
other similar products
Areas likely to have contaminants
Dry cleaning/laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and establishments
New building construction
Remodeling areas
Garages and workshops
Boiler Manual
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