LAARS Heating Systems
Page 14
Figure 10. Vent Dimensions, 2-Pipe System.
3.3.3 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 7
).
3.3.4 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 7
). 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.
3.3.5 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 hori-
zontally 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 detec-
tors.
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
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 DI-
RECTLY 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 unless, upon inspection, the
inspector observes carbon monoxide detectors and
signage installed in accordance with the provisions
of 248 CMR 5.08(2)(a) 1-4.
3.4 Common Vent Test
NOTE:
This section does not describe a method for
common venting Mascot II units. It describes what must
be done when a unit is removed from a common vent
system. Mascot II units require special vent systems
and fans for common vent. Contact the factory if you
have questions about common venting Mascot II units.
When an existing boiler is removed from a
common venting system, the common venting system is
likely to be too large for proper venting of the
appliances remaining connected to it.
At the time of removal of an existing boiler, the
Optional concentric vent kit sold separately.
Summary of Contents for Mascot II
Page 6: ...LAARS Heating Systems Page 6 Figure 2 Location of Components...
Page 27: ...Mascot II Boilers and Water Heaters Page 27 Figure 22 Wiring Diagram...
Page 42: ...LAARS Heating Systems Page 42 Figure 28 Panel Assembly Door Top...
Page 43: ...Mascot II Boilers and Water Heaters Page 43 Figure 29 Panel Assembly Door Middle...
Page 44: ...LAARS Heating Systems Page 44 Figure 30 Panel Assembly Door Bottom...
Page 45: ...Mascot II Boilers and Water Heaters Page 45 Figure 31 Base Jacket Assembly...
Page 46: ...LAARS Heating Systems Page 46 Figure 32 Heat Exchanger Cabinet Fan...
Page 47: ...Mascot II Boilers and Water Heaters Page 47 Figure 33 Heat Exchanger Burner Components...
Page 48: ...LAARS Heating Systems Page 48 Figure 34 Pump Assembly Components...
Page 49: ...Mascot II Boilers and Water Heaters Page 49 Figure 35 Plumbing Components...
Page 50: ...LAARS Heating Systems Page 50...
