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NeoTherm LC Boilers and Water Heaters
be installed per the vent manufacturers certified
installation instructions.
It is the responsibility of the appropriately
licensed technician installing this unit to use ULC
S636 certified vent material consistent with the
requirements as described in the Venting and
Combustion Air section.
Class I venting systems are suitable for gas-fired
appliances producing flue gas temperature of more
than 135°C, but not more than 245°C.
Class II venting systems are suitable for gas-fired
appliances producing flue gas temperatures of
135°C or less.
Class II venting systems are further classified into
four temperature ratings as follows:
A
Up to and including 65°C
B
Up to and including 90°C
C
Up to and including 110°C, and
D
Up to and including 135°C
Flue Gas Sampling Port -
It is also the responsibility of the installer to ensure that
a flue gas sampling port is installed in the vent system.
This flue gas sampling port must be installed near the
flue connection of the unit: and within 2 feet of the flue
connection. There is no flue gas sampling port internal
to the unit, so one must be installed in the vent system
external to the unit. A flue gas sampling port available
as a component of the ULC S636 certified vent system
is preferred. However, if one is not available with the
certified vent system, The manufacturer suggests
using a tee with the branch connection sized to allow
for insertion of a flue gas analyzer probe. The branch
connection must be resealable with a cap or other
means to ensure the vent system remains sealed.
(See Figure 5.)
Consideration must be given to the placement and
orientation of the flue gas sampling port to ensure that
condensate is free to flow back into the unit and not
collect anywhere in the vent system - including in the
flue gas sampling port.
Exhaust Vent Terminal -
An exhaust vent terminal must be installed. If an
exhaust vent terminal is not available with the certified
vent system, Manufacturer suggests the use of a
coupler fitting from the certified vent system into which
the vent terminal screen can be installed. Be sure
to install and terminate both vent and combustion air
pipes per the instructions in this section.
Figure 5. Test Port
3.D Locating the Vent and Combustion
Air Terminals
3.D.1 Side Wall Vent Terminal
The appropriate manufacturers side wall vent
terminal must be used. 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 6 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 create a nuisance or hazard.
3.
Locate the vent terminal so that vent gases
cannot be drawn into air conditioning system
inlets.
4.
Locate the vent terminal so that vent gases
cannot enter the building through doors,
windows, gravity inlets or other openings.
Whenever possible, avoid locations under
windows or near doors.
5.
Locate the vent terminal so that it cannot
be blocked by snow. The installer may
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