Installation / Operation Instruction Manual

Page 26
B RADFORD W HITE
Side Wall Combustion Air Terminal
The side wall combustion air terminal, or concentric
terminal must be used when the heater takes air from
a side wall. (See page 22 ) Contact manufacturer
for AL29-4C termination ttings. Consider the following
when installing the terminal. (See Figure 20 through
Figure 21.)
1. Do not locate the air inlet terminal near a source
of corrosive chemical fumes (e.g., cleaning uid,
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. For concentric vent, follow instructions
included with vent kit.
5. Multiple vent kits should be installed such that the
horizontal distance between the outlet group and
the inlet group is 36” (90cm). (Figure 19.)
6. The vent outlet for models 199-285 must be no
lower than the center of the air inlet, and must be
at least 12” (30cm) away from the air inlet. Vent
outlets for models 399-850 must be at least 12”
above the top of the air inlet, and must be at least
36” (90cm) horizontally from the air inlet. (page
26.)
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.
The vent terminal included with the unit can be used
in both vertical and horizontal applications. When the
combustion air is taken from the roof, the combustion
air must terminate at least 12” (30cm) below the vent
terminal. (See Figure 17.)
Vertical Combustion Air Terminal
When combustion air is taken from the roof, a eld-
supplied rain cap or an elbow arrangement must be
used to prevent entry of rain water. (Figure 17.) 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 nished 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-tter
shall observe that a hard-wired carbon monoxide
detector with an alarm battery back-up is installed
on the oor level where the gas appliance is to
be installed. In addition, the installing plumber or
gastter 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
150-285
Figure 19. Minimum Venting Distance