Laars NeoTherm NTH Installation And Operation Instructions Manual - page 9
NeoTherm Boiler
Page 9
A NeoTherm unit can take combustion air from
the space in which it is installed, or the combustion
air can be ducted directly to the unit. Ventilation air
must be provided in either case.
2.1.1 Combustion Air From Room
In the United States, the most common
requirements specify that the space shall communicate
with the outdoors in accordance with method 1 or 2,
which follow. Where ducts are used, they shall be of the
same cross-sectional area as the free area of the
openings to which they connect.
1.7 Locating the Appliance
NeoTherm is for indoor installations only.
The appliance should be located to provide
clearances on all sides for maintenance and inspection.
It should not be located in an area where leakage of any
connections will result in damage to the area adjacent to
the appliance or to lower floors of the structure.
When such a location is not available, it is
recommended that a suitable drain pan, adequately
drained, be installed under the appliance.
The appliance is design certified by CSA-
International for installation on combustible flooring; in
basements; in closets, utility rooms or alcoves
.
NeoTherm Boilers must never be installed on
carpeting.
The location for the appliance should be
chosen with regard to the vent pipe lengths and external
plumbing and on a level surface. The unit shall be
installed such that the gas ignition system components
are protected from water (dripping, spraying, rain, etc.)
during operation and service (circulator replacement,
control replacement, etc.). When vented vertically, the
NeoTherm must be located as close as practical to the
vertical section of the vent. If the vent terminal and/or
combustion air terminal terminate through a wall, and
there is potential for snow accumulation in the local
area, both terminals should be installed at an appropriate
level above grade or the maximum expected snow line.
The dimensions and requirements that are shown
in
Table 1
should be met when choosing the locations
for the appliance.
1.8 Locating Appliance for Correct Vent
Distance from Outside Wall or
Roof Termination
The forced draft combustion air blower in the
appliance has sufficient power to vent properly when
the guidelines in
Table 2
are followed.
NOTE:
When located on the same wall, the NeoTherm
combustion air intake terminal must be installed a
minimum of 12" (30cm) below the exhaust vent terminal.
For concentric vent terminal kit (optional), follow
installation instructions included with the kit.
SECTION 2.
Venting and Combustion Air
2.1 Combustion Air
NeoTherm boilers and water heaters must have
provisions for combustion and ventilation air in
accordance with the applicable requirements for
Combustion Air Supply and Ventilation in the National
Fuel Gas Code, ANSI Z223 1; or in Canada, the Natural
Gas and Propane Installation Code, CSA B149.1. All
applicable provisions of local building codes must also
be adhered to.
APPLIANCE
SUGGESTED SERVICE ACCESS CLEARANCE
SURFACE
INCHES
CM
Left Side
1
2.5
Right Side
12
31
Top
24
61
Back
16
15
Closet, Front
(285-500)
6
15
Alcove, Front
(285-500)
24
61
Front
(600-850)
24
61
Vent
–
–
Certified by CSA for zero clearance to
combustible materials on all sides.
Table 1. Clearances.
INTAKE / EXHAUST
STANDARD
MAX EQUIV.
OPTIONAL
MAX EQUIV.
SIZE
VENT
FT.
M
VENT
FT.
M
80
2"
40
6.1
3"
100
30.5
105
2"
40
6.1
3"
100
30.5
150
3"
100
30.5
n/a
—
—
210
3"
100
30.5
n/a
—
—
285
4"
100
30
3"
20
6.1
399
4"
100
30
n/a
—
—
500
4"
80
24.4
n/a
—
—
600
4"
80
24.4
6"
100
30
750
6"
100
30
4"
40
12.2
850
6"
100
30
4"
40
12.2
Intake (air) pipe must be PVC or CPVC that complies with ANSI/ASTM
D1785 F441.
Installations in the U.S. require exhaust vent pipe that is a combination
of PVC & CPVC complying with ANSI/ASTM D1785 F441 or stainless
steel complying with UL1738. Installations in Canada require exhaust
vent pipe that is certified to ULC S636.
Installer must comply fully with manufacturer's installation instructions,
including use of minimum exhaust length CPVC, to maintain ANSI
Z21.13 safety certification.
Closet and alcove installations do not allow the use of PVC under any
circumstances
To calculate max equivalent length, measure the linear feet of the
pipe, and add 5 feet
(1.5m)
for each elbow used.
Table 2. Vent / Air Pipe Sizes.