Laars NeoTherm NTH Installation And Operation Instructions Manual - page 11
NeoTherm Boiler
Page 11
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.
The unit’s vent can terminate through the roof, or
through an outside wall.
When using PVC/CPVC for vent material, venting
must be connected to the CPVC section included with
the boiler (sizes 80-600). It may be broken by CPVC
fittings if necessary, but never reduced in total length.
See
Table 2
to select the appropriate vent pipe diameter.
Vent pipe must pitch upward, toward the vent terminal,
so that condensate will run back to the NeoTherm to
drain. Route vent pipe to the heater as directly as
possible. Seal all joints and provide adequate hangers as
required in the venting system manufacturer’s
Installation Instructions. Horizontal portions of the
venting system must be supported to prevent sagging
and may not have any low sections that could trap
condensate. The unit must not support the weight of the
vent pipe. Horizontal runs must slope upwards not less
than ¼ inch per foot from the unit to the vent terminal.
Please see
Table 2
for proper diameter vs. length
allowed.
IMPORTANT NOTE ABOUT COMMON VENTING:
A
single vent that is shared by multiple NeoTherm units
MUST be engineered by a competent venting
specialist, and involves the selection of draft inducing
equipment, hardware and controls to properly balance
flue gas pressures.
Do not common vent NeoTherm
units unless the vent system meets this
requirement. NeoTherm units are never permitted
to share a vent with Category I appliances.
INSTALLATION STANDARDS
MATERIAL
UNITED STATES
CANADA
Stainless Steel
UL 1738
Venting must be ULC-S636 certified for use as
PVC, sch 40
ANSI/ASTM D178
venting material. The venting material must be chosen
CPVC, sch 40
ANSI/ASTM F441
based upon the intended application of the boiler.
Table 5. Required Exhaust Vent Material.
INSTALLATION STANDARDS
MATERIAL
UNITED STATES
CANADA
ABS
ANSI/ASTM D1527
PVC, sch 40
ANSI/ASTM D1785 or D2665
Venting material must be chosen
CPVC, sch 40
ANSI/ASTM F441
based upon the intended application of the boiler.
Table 4. Required Combustion Air Vent Material.
HORIZONTAL INTAKE AND EXHAUST PVC VENT TERMINAL KITS
2" PVC
3" PVC
4" PVC
6" PVC
SIZE
Standard
Concentric
Standard
Concentric
Standard
Standard
CA006000
CA005900 239-44069-01
80
included optional
optional
optional
n/a
n/a
105
included optional
optional
optional
n/a
n/a
150
n/a
n/a
included optional
n/a
n/a
210
n/a
n/a
included optional
n/a
n/a
285
n/a
n/a
optional
optional
included
n/a
399
n/a
n/a
n/a
n/a
included
n/a
500
n/a
n/a
n/a
n/a
included
n/a
600
n/a
n/a
n/a
n/a
included
optional
750
n/a
n/a
n/a
n/a
n/a
included
850
n/a
n/a
n/a
n/a
n/a
included
Concentric vent terminal = 10 ft. pipe length.
Table 3. PVC Vent Terminal Kits.