LP-446-r4 Rev. 10.12.16
12
1. Direct Vent of Exhaust and Intake
If installing a direct vent option, combustion air must be drawn
from the outdoors directly into the boiler intake and exhaust
must terminate outdoors. There are three basic direct vent
options detailed in this manual: 1. Side Wall Venting, 2. Roof
Venting, and 3. Unbalanced Venting.
Be sure to locate the boiler such that the exhaust vent and
intake piping can be routed through the building and properly
terminated. Different vent terminals can be used to simplify and
eliminate multiple penetrations in the building structure (see
Optional Equipment in Venting Section). The exhaust vent and
intake piping lengths, routing, and termination methods must
all comply with the methods and limits given in the Venting
Section, this manual.
When installing a combustion air intake from outdoors, care
must be taken to utilize uncontaminated combustion air.
To
prevent combustion air contamination, see Table 3.
2. Indoor Combustion Air in Confined or Unconfined Space
This boiler requires fresh, uncontaminated air for safe operation
and must be installed in a mechanical room where there is
adequate combustion and ventilating air.
NOTE: To prevent
combustion air contamination, see Table 3.
Combustion air from the indoor space can be used if the space
has adequate area or when air is provided through a duct or
louver to supply sufficient combustion air based on the boiler
input. Never obstruct the supply of combustion air to the boiler.
If the boiler is installed in areas where indoor air is contaminated
(see Table 3) it is imperative that the boiler be installed as direct
vent so that all combustion air is taken directly from the outdoors
into the boiler intake connection.
Unconfined space
is space with volume greater than 50 cubic
feet per 1,000 BTU/hr (4.8 cubic meters per kW) of the total
input rating of all fuel-burning appliances installed in that space.
Rooms connected directly to this space through openings not
furnished with doors are considered part of the space. See
Venting Section for details.
Confined space
is space with volume less than 50 cubic feet per
1,000 BTU/hr (4.8 cubic meters per kW) of the total input rating
of all fuel-burning appliances installed in that space. Rooms
connected directly to this space through openings not furnished
with doors are considered part of the space.
When drawing combustion air from inside a conventionally
constructed building to a confined space, such space should be
provided with two permanent openings: one located 6” (15 cm)
below the space ceiling, the other 6” (15cm) above the space
floor. Each opening should have a free area of one square inch
per 1,000 BTU/hr (22cm
2
/kW) of the total input of all appliances
in the space, but not less than 100 square inches (645cm
2
).
If the confined space is within a building of tight construction, air
for combustion must be obtained from the outdoors as outlined
in the Venting section of this manual.
When drawing combustion air from the outside into the
mechanical room, care must be taken to provide adequate
freeze protection.
Failure to provide an adequate supply of fresh combustion
air can cause poisonous flue gases to enter the living space,
resulting in severe personal injury or death. To prevent
combustion air contamination, see Table 3.
G. Prevent Combustion Air Contamination
Install intake air piping for the boiler as described in the
Venting Section, this manual. Do not terminate exhaust in
locations that can allow contamination of intake air.
Ensure that the intake air will not contain any of the
contaminants in Table 3. Contaminated air will damage the
boiler, resulting in possible substantial property damage,
severe personal injury, or death. For example, do not pipe
intake air near a swimming pool or laundry facilities. These
areas always contain contaminants.
Products to Avoid
Areas Likely to Have
Contaminants
Spray
cans
containing
fluorocarbons
Dry cleaning / laundry areas
and establishments
Permanent wave solutions
Swimming pools
Chlorinated waxes / cleaners
Metal fabrication plants
Chlorine-based swimming pool
chemicals
Beauty shops
Calcium chloride used for thawing Refrigeration repair shops
Sodium chloride used for water
softening
Photo processing plants
Refrigerant leaks
Auto body shops
Paint or varnish removers
Plastic manufacturing plants
Hydrochloric or Muriatic acid
Furniture refinishing areas
and establishments
Cements and glues
New building construction
Antistatic fabric softeners used in
clothes dryers
Remodeling areas
Chlorine-type bleaches, laundry
detergents, and cleaning solvents
Garages and workshops
Adhesives used to fasten building
products
Table 3 - Products and Areas Likely to Have Contaminants
NOTE: DAMAGE TO THE BOILER CAUSED BY EXPOSURE
TO CORROSIVE VAPORS IS NOT COVERED BY
WARRANTY.
(Refer to the limited warranty for complete
terms and conditions.)
H. Removing a Boiler from a Common Vent System
Failure to follow all instructions can result in flue gas spillage
and carbon monoxide emissions, causing severe personal
injury or death.
Do not install the boiler into a common vent with any other
appliance. This will cause flue gas spillage or appliance
malfunction, resulting in possible substantial property
damage, severe personal injury, or death.
Summary of Contents for MODCON500
Page 35: ...LP 446 r4 Rev 10 12 16 35 Figure 29 Cascade Master and FollowerWiring...
Page 57: ...LP 446 r4 Rev 10 12 16 57 Figure 35 500 Model Combustion System Replacement Parts...
Page 58: ...LP 446 r4 Rev 10 12 16 58 Figure 36 700 850 Models Combustion System Replacement Parts...
Page 60: ...LP 446 r4 Rev 10 12 16 60 Figure 38 Cabinet Replacement Parts All Models...
