Weil-McLain 2 Series Manual page 24

®
SlimFit Series 2
Venting/combustion air — general
Co mbustion air contamination
1. (combustion air from boiler room):
a. Provide combustion air openings to boiler room as described
in this manual.
b. Ensure the boiler room and combustion air source areas are
free of contaminants.
Corrosive contaminants and sources
Products to avoid
Spray cans containing chloro/fl uorocarbons
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
Venting/combustion air — options
Boiler vent and air connections:
Provide a vent pipe mfr's Slim-Fit VENT/AIR ADAPTER at boiler vent connection and air connection (if used).
See Figure 96, page 105 for part/kit numbers.
Provide pipe manufacturer's reducer(s) as needed to meet vent/air pipe size used.
BIRD SCREENS 
Provide a vent manufacturer's
SCREEN at each termination
must be purchased from the vent/air pip-
ing supplier.
BOILER VENT/AIR CON NECTION GASKETS
Verify that the gasket is installed correctly, as
shown in the images at right. The barbed band of
the gasket must point DOWN.
BOILER VENT CON NECTION CLAMP
DO NOT over-tighten the vent connection-to-vent
adapter clamp. Tighten securely while checking
to make sure that the clamping band does not
deform or dig into the plastic vent connector.
24
COMMERCIAL CONDENSING GAS
BIRD
. Bird screens
- — Boiler Manual
FIRED WATER BOILER
(continued)
2. (combustion air piped from outside):
a. Install air inlet piping for the SlimFit boiler as described in
this manual.
b. Do not terminate air piping in locations that can allow con-
tamination of combustion air.
3. See Figure 21 for products and areas which may cause contami-
nated combustion air.
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 refi nishing areas and establishments
New building construction
Remodeling areas
Garages with workshops
USE SWEEP ELBOWS FOR ALL VENT AND AIR PIPING
WHEN POSSIBLE — Short-radius elbows cause higher
pressure loss, resulting in less allowable vent/air piping
length. See Figure 24, page 29 for maximum lengths and
reductions required for fi ttings.
Outlet
Gasket
Vent or air
connection
Part number 550-100-180/0917