Laars NeoTherm NTH Installation and operation instructions manual - page 10
LAARS Heating Systems
Page 10
The unit’s vent can terminate through the roof, or
through an outside wall.
Venting should be connected to the CPVC section
included with the boiler. The included section of CPVC
must be used to make the connection to the boiler. 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. Up to 100 equivalent feet (30m) of pipe can be used.
Subtract 5 feet (1.5m) for each elbow used.
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.
A condensate drain is built into the NeoTherm. A
float switch monitors the condensate trap, and will open
if the condensate level gets too high. This will prevent
the NeoTherm from firing if there is a blockage or
overflow.
Connect a 3/4" PVC pipe between the drain
connection and a floor drain (or condensate pump if a
floor drain is not accessible).
The condensate drain must be installed so as to
prevent accumulation of condensate. When a
condensate pump is not used, the tubing must
continuously slope downward toward the drain with no
spiraling.
Consult local codes for disposal method.
Caution
Condensate is mildly acidic (pH
.
..
.
.5), and may harm
some floor drains and/or pipes, particularly those that
are metal. Ensure that the drain, drainpipe, and
anything that will come in contact with the
condensate can withstand the acidity, or neutralize
the condensate before disposal. Damage caused by
failure to install a neutralizer kit or to adequately
treat condensate will not be the manufacturer’s
responsibility.
2.3 Locating Vent & Combustion Air
Terminals
2.3.1 Side Wall Vent Terminal
The appropriate Laars side wall vent terminal must
be used, and is listed in this installation and operation
manual. The terminal must be located in accordance
with ANSI Z223.1/NFPA 54 and applicable local codes.
In Canada, the installation must be in accordance with
CSA B149.1 or .2 and local applicable codes. Consider
the following when installing the terminal:
1.
Figure 9
shows the requirements for mechanical
vent terminal clearances for the U.S. and Canada.
2.
Vent terminals for condensing appliances or
appliances with condensing vents are not
permitted to terminate above a public walkway, or
over an area where condensate or vapor could
HORIZONTAL INTAKE AND EXHAUST PVC VENT TERMINAL KITS
2" PVC
3" PVC
4" PVC
SIZE
Standard
Concentric
Standard
Concentric
Standard
CA006000
CA005900
239-44069-01
80
included
optional
optional
optional
n/a
105
included
optional
optional
optional
n/a
150
n/a
n/a
included
optional
n/a
210
n/a
n/a
included
optional
n/a
285
n/a
n/a
optional
optional
included
399
n/a
n/a
n/a
n/a
included
500
n/a
n/a
n/a
n/a
included
Concentric vent terminal = 10 ft. pipe length.
Table 3. PVC Vent Terminal Kits.
INSTALLATION STANDARDS
MATERIAL
UNITED STATES
CANADA
Stainless Steel
UL 1738
All 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
All venting must be ULC-S636 certified for use as
PVC, sch 40
ANSI/ASTM D1785 or D2665
venting material. The 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.