Laars NeoTherm NTH Installation and operation instructions manual - page 12
LAARS Heating Systems
Page 12
create a nuisance or hazard.
3.
Locate the vent terminal so that vent gases can-not
be drawn into air conditioning system inlets.
4.
Locate the vent terminal so that vent gases cannot
enter the building through doors, windows, gravity
inlets or other openings. Whenever possible, avoid
locations under windows or near doors.
5.
Locate the vent terminal so that it cannot be
blocked by snow. The installer may determine
that a vent terminal must be higher than the
minimum shown in codes, depending upon local
conditions.
6.
Locate the terminal so the vent exhaust does not
settle on building surfaces or other nearby objects.
Vent products may damage surfaces or objects.
7.
If the boiler or water heater uses ducted
combustion air from an intake terminal located on
the same wall, locate the vent terminal at least 1
foot (0.3m) above the combustion air terminal.
2.3.2 Side Wall Combustion Air Terminal
The LAARS side wall combustion air terminal, or
concentric terminal (
see Table 3
), must be used when
the heater takes air from a side wall. Consider the
following when installing the terminal:
1.
Do not locate the air inlet terminal near a source of
corrosive chemical fumes (e.g., cleaning fluid,
chlorine compounds, etc.)
2.
Locate the terminal so that it will not be subject to
damage by accident or vandalism. It must be at
least 7 feet (2.1m) above a public walkway.
3.
Locate the combustion air terminal so that it
cannot be blocked by snow. The National Fuel Gas
Code requires that it be at least 12 inches (30cm)
above grade, but the installer may determine it
should be higher, depending upon local conditions.
4.
If the NeoTherm is side-wall vented to the same
wall, locate the vent terminal at least 1 foot (0.3m)
above the combustion air terminal.
5.
For concentric vent, follow instructions
included with vent kit.
6.
Multiple vent kits should be installed where the
horizontal distance between outlet group and inlet
group is 18" minimum.
7.
Vent outlet should be 12" above and/or 12"
horizontal to inlet pipe, but outlet should never be
mounted below the inlet centerline at any
horizontal distance.
2.3.3 Vertical Vent Terminal
When the unit is vented through the roof, the vent
must extend at least 3 feet (0.9m) above the point at
which it penetrates the roof. It must extend at least 2
feet (0.6m) higher than any portion of a building within
a horizontal distance of 10 feet (3.0m), and high enough
above the roof line to prevent blockage from snow.
When the combustion air is taken from the roof, the
combustion air must terminate at least 12" (30cm)
below the vent terminal (
see Figure 8
).
2.3.4 Vertical Combustion Air Terminal
When combustion air is taken from the roof, a
field-supplied rain cap or an elbow arrangement must be
used to prevent entry of rain water (
see Figure 8
). The
opening on the end of the terminal must be at least 12"
(30cm) above the point at which it penetrates the roof,
and high enough above the roof line to prevent blockage
from snow. When the vent terminates on the roof, the
combustion air must terminate at least 12" (30cm)
below the vent terminal.
2.3.5 Installations in the Commonwealth of
Massachusetts
In Massachusetts the following items are required if
the side-wall exhaust vent termination is less than seven (7)
feet above finished grade in the area of the venting,
including but not limited to decks and porches. From
Massachusetts Rules and regulations 248 CMR 5.08
1.
Installation of Carbon Monoxide Detectors
At the time of installation of the side wall vented
gas fueled appliance, the installing plumber or
gasfitter shall observe that a hard-wired carbon
monoxide detector with an alarm battery back-up is
installed on the floor level where the gas appliance
is to be installed. In addition, the installing
plumber or gasfitter shall observe that a battery
operated or hard-wired carbon monoxide detector
with an alarm is installed on each additional level
of the dwelling, building or structure served by the
side-wall horizontally vented gas fueled equip-
ment. It shall be the responsibility of the property
owner to secure the services of qualified licensed
professionals for installation of hard-wired carbon
monoxide detectors.
a. In the event that the side-wall horizontally
vented gas fueled equipment is installed in a crawl
space or an attic, the hard-wired carbon monoxide
with alarm and battery back-up may be installed on
the next adjacent floor level.
b. In the event that the requirements of the subdivi-
sion 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 be installed.
2.
Approved Carbon Monoxide Detectors
Each carbon monoxide detector shall comply with
NFPA 720 and be ANSI/UL 2034 listed and IAS
certified.
3.
Signage
A metal or plastic identification plate shall be per-
manently mounted to the exterior of the building at
a minimum height of eight (8) feet above grade
directly in line with the exhaust vent terminal for
horizontally vented gas fueled heating appliance or