lp-445-r4 Rev. 006 Rel. 027 Date 7.21.20
10
The exhaust discharged by this boiler may be very hot. Avoid
touching or other direct contact with the exhaust gases of the vent
termination assembly. Doing so could result in severe personal
injury or death.
Vents must be properly supported. Boiler exhaust and intake
connections are not designed to carry heavy weight. Vent support
brackets must be within 1’ of the boiler and the balance at 4’ intervals.
Boiler must be readily accessible for visual inspection for first 3’ from
the boiler. Failure to properly support vents could result in property
damage, severe personal injury, or death.
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 1.
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 1.
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 1) 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 1.
H. 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 1. 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.
In the Commonwealth of Massachusetts and As Required by
State and Local Codes:
Installation of Carbon Monoxide Detectors: At the time of installation
or replacement of the vented gas fueled appliance, the installing
plumber or gas fitter shall observe that a hard wired carbon
monoxide detector with an alarm and battery back-up is installed
on the floor level where the gas appliance is installed, unless the
appliance is located in a detached, uninhabitable structure separate
from the dwelling, building, or structure used in whole or in part for
residential purposes.
In addition, the installing plumber or gas fitter shall observe that a
hard wired carbon monoxide detector with an alarm and battery
back-up is installed on each additional level of the dwelling,
building, or structure served by the vented gas appliance. It shall
be the responsibility of the property owner to secure the service
of qualified licensed professionals for the installation of hard wired
carbon monoxide detectors.
a. In the event that the vented gas fueled appliance is installed in
a crawl space or attic, the hard wired carbon monoxide detector
with alarm and battery back-up shall be installed on the next
adjacent floor level.
b. In the event that these requirements cannot be met at the time
of completion of installation, the owner shall have a period of
thirty (30) days to comply with the above requirements; provided,
however, that during said thirty (30) day period, a battery operated
carbon monoxide detector with an alarm shall be installed.
G. Carbon Monoxide Detectors
Do not attempt to vent this appliance by any means other than
those described in this manual. Doing so will void the warranty
and may result in severe personal injury or death.
Approved Carbon Monoxide Detectors: Each carbon monoxide
detector as required in accordance with the above provisions shall
comply with NFPA 70 and be ANSI/UL 2034 listed and IAS certified.
