Install Instructions

Page 8
LAARS Heating Systems
3.3 Venting
WARNING
Failure to use polypropylene CPVC or stainless steel
venting for the rst 30” 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. Boilers in
the U.S. may use pipe included with the boiler.
Failure to use the appropriate vent material, installation
techniques, glues/sealants could lead to vent failure
causing property damage, personal injury or death.
Use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel® (polyphenolsulfone) in non-metallic
venting systems is prohibited and that covering non-
metallic vent pipe and ttings with thermal insulation is
prohibited.
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 ue 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
certied vent class. If the NeoTherm is installed in an
application where the ambient temperature is elevated,
and/or installed in a closet/alcove, polypropylene, CPVC
or stainless steel material is required. If the system
temperatures 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, polypropylene that complies with ULC-S636 Class IIb,
or a stainless steel venting system that complies with the vent
suppliers and part numbers in Section 3. (See Table 5.)
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 NeoTherm sizes
80-210. The CPVC vent section included with the NeoTherm
may be broken by CPVC ttings if necessary, but never
reduced in total length. See Table 4 to select the appropriate
vent pipe diameter. When using polypropylene, all vent
material must be produced by the same manufacturer, and
have a ULC-S636 rating.
All installations should be done following the vent supplier’s
recommended installation techniques. If manufacturer’s
instructions are not available for the material used, follow the
Laars recommendations.
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 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. Please
see Table 4 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 ue 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.
VentingRequirementsUniquetoCanada
NeoTherm 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 certied stainless steel
or other ULC S636 certied BH vent (eg. plastics) must be
installed per the vent manufacturer’s certied installation
instructions.
As a result, two items listed in the Unpacking section (Figure
8) are not included with NeoTherm units for Canada
(underlined):
A exhaust vent terminal (not included)
B. air intake terminal
C. temperature/pressure gauge kit
D. circulator pump/wire harness (units with pump)
INSTALLATION STANDARDS
MATERIAL UNITED STATES CANADA
Stainless Steel UL 1738 Venting must be ULC-S636 certied for use as
PVC, sch 40 ANSI/ASTM D1785 venting material. The venting material class must be
CPVC, sch 40 ANSI/ASTM F441 chosen based upon the maximum ue gas temperature
Polypropylene ULC-S636 and the intended application of the boiler.
Table9. -RequiredExhaustVentMaterial