Laars NeoTherm NTH Installation and operation instructions manual - page 9
NeoTherm Boiler
Page 9
2.1.2 Intake Combustion Air
The combustion air can be taken through the wall, or
through the roof. When taken from the wall, it must be
taken from out-of-doors by means of the LAARS
horizontal wall terminal, shown in
Table 3
. See
Table 2
to
select the appropriate diameter air pipe. When taken from
the roof, a field-supplied rain cap or an elbow arrangement
must be used to prevent entry of rain water (see
Figure 8
).
Use ABS, PVC, CPVC or galvanized pipe for the
combustion air intake (see
Table 4
), sized per
Section 1.8
.
Route the intake to the heater as directly as possible. Seal
all joints. Provide adequate hangers. The unit must not
support the weight of the combustion air intake pipe. Max-
imum linear pipe length allowed is shown in
Table 2
.
Subtract 5 allowable linear ft. (1.5m) for every elbow used.
The connection for the intake air pipe is at the top of
the unit. To aid in boiler service, a removable adapter is
recommended when making the connection to the boiler.
In addition to air needed for combustion, air shall
also be supplied for ventilation, including air required for
comfort and proper working conditions for personnel.
2.2 Venting
WARNING
Failure to use CPVC or stainless steel venting for the
first 20" (285-500) / 30" (80-210) of vent material or
for any part of the venting that is installed inside a
closet may lead to property damage, personal injury
or death. The proper length of this material is
supplied with boiler.
WARNING
Failure to use the appropriate vent material,
installation techniques, glues/sealants could lead to
vent failure causing property damage, personal injury
or death.
WARNING
All venting must be installed according to this manual
and any other applicable local codes, including but
not limited to, ANSI Z223.1/NFPA 54, CSA B149.1,
CSAB149.2 and ULC-S636. Failure to follow this
manual and applicable codes may lead to property
damage, severe injury, or death.
The flue temperature of the NeoTherm changes
dramatically with changes in operating water
temperature. Therefore, it is necessary to assess the
application of the boiler to determine the required
certified vent class. If the NeoTherm is installed in
an application where the ambient temperature is
elevated, and/or installed in a closet, CPVC or stain-
less steel material is required. If the system temp-
eratures are unknown at the time of installation,
class IIB or higher venting material is recommended.
The NeoTherm is a Category IV appliance and
may be installed with PVC and CPVC that complies
with ANSI/ASTM D1785 F441, or a stainless steel
venting system that complies with UL 1738 Standard
(see
Table 5
).
Installations in Canada require the use of
venting material certified to ULCS636. All Gas vents
connected to the NeoTherm, plastic, stainless steel or
otherwise must be certified to this ULC standard.
Appropriate selection of vent material is very
important for proper performance and safe
operation of the NeoTherm. Vent material MUST be
selected based upon operating conditions such as
outlet water temperature and installed location.
The flue temperature of the NeoTherm changes
dramatically with changes in operating water
temperature. Therefore, it is necessary to assess the
application of the boiler to determine the required
certified vent class. If the NeoTherm is installed in
an application where the outlet water temperature
exceeds 145°F, and/or installed in a closet, class IIB
or higher vent material is required. If the system
temperatures are unknown at the time of
installation, class IIB or higher venting material is
recommended.
In Canada all venting used must meet the
following requirements:
1.
ULC-S636 certified and marked
2.
The first 3 feet of venting must be accessible for
visual inspection.
3.
All components used in the vent system must be
from a certified manufacturer.
4 .
Vent system components must not be mixed
with alternate manufacturers certified
components and/or unlisted components.
5 .
The venting must be installed according to the
vent manufacturers installation instructions.
Figure 8. Combustion Air and Vent Through Roof.