Air Piping - General - Weil-McLain Ultra Manual

-
gas fired water boiler
Air piping — general
You must pipe combustion air to the boiler air
intake
.
The air termination fitting must be installed with the
clearances and geometry relative to the vent outlet de-
picted in this manual to ensure that flue products do not
enter the air intake.
Ensure that the combustion air will not contain any of
the contaminants in Figure 30.
Do not pipe combustion air near a swimming pool, for
example.
Avoid areas subject to exhaust fumes from laundry facili-
ties. These areas will always contain contaminants.
Contaminated combustion air will damage the boiler,
resulting in possible severe personal injury, death or
substantial property damage.
Manifolded combustion air option
1. Multiple Ultra boilers can use a common combustion air manifold.
a. See Figure 114, page 106 for minimum cross sectional area of
combined air ducts.
b. Provide minimum clearance to adjacent vents and grade/snow line
as shown in Figure 31.
c. Provide minimum free area in duct (adjusted for louver restriction)
1 square inch per 2,000 Btuh
of
d. If combustion air damper is used, wire to boilers to prevent opera-
tion except after damper has opened.
ONLY air piping can be combined. DO NOT use combined
vent piping. Flue gas leakage and boiler component damage
can occur. Failure to comply could result in severe personal
injury, death or substantial property damage.
Figure 31
Manifolded combustion air option (DO NOT use common
venting — the manifold option is only for combustion air —
all vent pipes must be routed and terminated individually as
described in this manual.) — (See Figure 114, page 106 for
minimum cross sectional area of combined air ducts.)
30
— Boiler Manual
total boiler input.
Prevent combustion air
contamination
1. Install air inlet piping for the Ultra boiler as de-
scribed in this manual.
2. Do not terminate air piping in locations that can
allow contamination of combustion air.
3. Refer to Figure 30 for products and areas which may
cause contaminated combustion air.
Figure 30
Corrosive contaminants and sources
Products to avoid
Spray cans containing chloro/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
Excessive dust and dirt
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 with workshops
Part number 550-100-066/0608