LAARS Mighty Max VW (Sizes 320M - 400M) - Installation, Operation and Maintenance Instructions - Manual (Page 10)

Page 10
LAARS Heating Systems
The following requirements must be used for
Non-Category I venting:
1.
Laars specified vent pipe material (Table 6) and
sizes (Table 7).
2. Pipe insulation and sealing tape.
3. Routing vent pipe through spaces which, except
for the terminal, remain above 60°F (16°C)
during heater operation.
2.10.3 Horizontal Venting - Non-Category I
When venting is horizontal, or cannot meet the
code requirements for Category I - Blower-Assisted
Vertical Vents, it can develop positive pressure and
must be installed in accordance with this section.
The following requirements must be used for
Horizontal Venting - Non-Category I:
1.
Laars specified vent piping materials
(Table 6) and sizes (Table 7).
2. Laars side wall vent hood.
3. Pipe insulation and sealing tape.
4. Routing vent pipe through spaces which, except
for the terminal, remain above 60°F (16°C)
during heater operation.
2.10.4 Side Wall Vent Terminal
The side wall vent hood must be used when the
heater is vented through a side wall. It provides a
means of installing vent piping through the building
wall, and 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 and local applicable codes (see Figure 9).
Consider the following when installing the terminal:
1.
Locate the vent terminal so that it will not be
damaged by pedestrians and other traffic, and so
the discharge is not objectionable. The National
Fuel Gas Code requires a through-wall vent
terminal be at least 7 feet (2.1m) above grade if
located at a public walkway.
2. Locate the vent terminal so that vent gases
cannot be drawn into air conditioning system
inlets. The National Fuel Gas Code requires that
it be at least 6 feet (1.8m) above any such inlet
that is within 10 feet (3m).
3. Locate the vent terminal so that vent gases
cannot enter the building through doors,
windows, gravity inlets or other openings. The
National Fuel Gas Code requires that it be
located at least 4 feet (1.2m) below, 4 feet (1.2m)
horizontally from, or 3 feet (0.9m) above such
openings.
4. Locate the vent terminal so that it cannot be
blocked by snow. The National Fuel Gas code
requires that it be at least 12 inches (305mm)
above grade, but the installer may determine it
should be higher depending on local conditions.
5. Locate the terminal so the vent exhaust does not
settle on building surfaces and other nearby
objects. Vent products may damage such
surfaces or objects. But the actual construction of
the vent terminal and the flow of vent products
must not be altered.
6. Locate the terminal at least 6 feet (1.8m)
horizontally from any gas or electric metering,
regulating, or relief equipment, or building
opening.
Mighty Max units are Category I fan-assisted
when vented vertically and adhering to all applicable
codes. Mighty Max units are not allowed to be vented
into a common horizontal vent system, unless a
properly-sized vent fan is used, and the common vent
system is properly designed by the vent fan
manufacturer or a qualified engineer.
When common venting Mighty Max fan-assisted
heaters with other appliances through one shared
vertical duct called a “common vent”, special care
must be taken by the installer to ensure safe operation.
In the event that the common vent is blocked, it is
possible, especially for fan-assisted devices, to vent
backwards through non-operating appliances sharing
the vent, allowing combustion products to infiltrate
occupied spaces. If the appliances are allowed to
operate in this condition, serious injury or death may
occur.
WARNING
Operation of appliances with a blocked common
vent may lead to serious injury or death. Safety
devices must be implemented to prevent blocked
common vent operation. If safe operation of all
appliances connected to a common vent cannot be
assured, including prevention of spillage of flue
gasses into living spaces, common venting should
not be applied, and appliances should each be
vented separately.
Term Description
Pipe Must comply with UL Standard 1738
such as type 29-4C stainless steel
Joint Sealing Follow vent manufacturer's
instructions
Insulation Recommended, but not required,
minimum R5 with protective cover
Table 6. Required Horizontal Venting Material.
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