Laars NTH1000, Installation And Operation Instructions Manual, Page: 15 / 140

NeoTherm LC Boilers and Water Heaters Page 11
3.2 Venting
WARNING
Selection of improper vent materials for installations
that are installed in closets, or will be operated
in high ambient temperature levels, may lead to
property damage, personal injury, or death.
WARNING
A 12” or 305 mm section (for Model 1000) or 36” or
915 mm section (for Model 1700) of CPVC must be
connected directly to the boiler before a PVC vent
system can be used. Connecting PVC directly to the
boiler’s flue collar may cause vent failure, leading to
property damage, personal injury, or death.
WARNING
Failure to use the appropriate vent material,
installation techniques, or glues and 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 LC
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
LC is installed in an application where the
ambient temperature is elevated, and/or installed
in a closet/alcove, CPVC, polypropylene, or
stainless steel material is required. If the system
temperatures are unknown at the time of
installation, class IIC or higher venting material
is recommended.
The NeoTherm LC is a Category IV appliance and
may be installed with PVC, CPVC that complies
with ANSI/ASTM D1785 F441, or polypropylene
that complies with ULC-S636 Class 2C, or a
stainless steel venting system that complies with the
UL 1738 Standard. (See Table 5.) The unit’s vent
can terminate through the roof, or through an outside
wall.
The use of polypropylene vent material has
been accepted by CSA for use with exhaust and
combustion. The polypropylene vent manufacturer
shall have ULCS636 Class 2C approval or higher
with a recognized listing agency for all components
used in the venting system. All components used
must be from the same manufacturer and designed
for use with exhaust temperatures of 195°F
(90°C) or higher. When installing polypropylene
vent systems, please, refer to the vent supplier’s
installation instructions for proper installation
techniques.
When using PVC/CPVC for the vent material, the
first 12 inches or 305 mm (for Model 1000) or 36”
or 915 mm (for Model 1700) of the vent must be
connected to the CPVC section included with the
NeoTherm LC. The CPVC vent section included
with the NeoTherm LC may be broken by CPVC
fittings if necessary, but never reduced in total
length. See Table 2 to select the appropriate vent
pipe diameter.
When using polypropylene, all vent material must be
from the same manufacturer and UL-S636 rated.
All installations must be done following the vent
supplier’s recommended installation techniques.
If these are not available, refer to the Laars
recommendations for the material used.
The vent pipe must pitch upward, toward the
vent terminal, not less than 1/4” per foot, so that
condensate will run back to the NeoTherm LC to
drain. Route the vent pipe to the heater as directly as
possible. Seal all joints. 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. Please see Table 2 for proper diameter
vs. length allowed.
3.2.1 Common Venting
A single vent that is shared by multiple NeoTherm
LC’s must be engineered by a competent venting
specialist, and could involve the selection of draft
inducing equipment, hardware and controls to
properly balance flue gas pressures. Do not common
vent NeoTherm LC’s unless the vent system
meets this requirement. NeoTherm LC’s are
never permitted to share a vent with Category I
appliances.
3.2.2 Venting Requirements Unique to
Canada
NeoTherm LC boilers and water heaters are Vent
Category IV appliances. Per the requirements of
CAN/CSA-B149.1, only BH vent systems can be
connected to these units and such vent systems,
either ULC S636 certified stainless steel or other
ULC S636 certified BH vent (eg. plastics) must
be installed per the vent manufacturer’s certified
installation instructions.