LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual - Manual (Page 12)

Page 8 LAARS Heating Systems
Section 2 -
LOCATING THE APPLIANCE
2.1 General Information
The NeoTherm unit is designed 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.
2.2 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” below the exhaust terminal.Models 399-
850 also require a minimum horizontal distance from
intake to exhaust terminal of 36”.
For concentric vent terminal kit (optional), follow installation
instructions included with the kit.
APPLIANCE SUGGESTED SERVICE ACCESS CLEARANCE
SURFACE INCHES cm
Left Side 1 2.5
Right Side 12 31
Top 24 61
Back 6 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 — —
199/210 3” 100 30.5 n/a — —
285 4” 100 30 n/a — —
399 4” 100 30 n/a — —
500 4” 100 30 n/a — —
600* 4” 40 6.1 6” 100 30
750 4” 40 6.1 6” 100 30
850 4” 40 6.1 6” 100 30
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.
Intake (air) pipe must be PVC or CPVC that complies with ANSI/ASTM
D1785 F441, ABS that complies with ANSI/ASTM D1527 or galvanized
material.
The installer must comply fully with the manufacturer’s installation
instructions, including use of minimum exhaust length CPVC, to main-
tain 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 90°
* elbow used.
* For any combination of vent and intake lengths up to 40 equivalent
feet, any even or uneven combination of length is allowed. For overall
lengths greater than 40 equivalent feet, the exhaust may be up to 20
feet greater than the intake length.
Table 2 - Vent / Air Pipe Sizes
* Add 2 1/2 feet (.76 meters) for each 45 elbow used.