Laars NTH, Installation And Operation Instructions Manual

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Page 20
LAARS Heating Systems
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. (Figure 15.) 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.
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 (begininning on 2nd page
following):
1.
Installation of Carbon Monoxide Detectors
At the time of installation of the side wall vented gas
fueled appliance, the installing plumber or gas-fitter 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 equipment. 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 subdivision
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
permanently 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 equipment. The
sign shall read, in print no less than one-half (1/2) inch in
size: “GAS VENT DIRECTLY BELOW, KEEP CLEAR
OF ALL OBSTRUCTIONS.”
4.
Inspection
The state or local gas inspector of the side-wall horizontally
vented gas fueled appliance shall not approve the installation
Figure 20. Multiple Side-Wall Terminals,
Figure 19. Minimum Venting Distance