72
11.10 - Single pipe
vent (not sealed
combustion)
For heaters for connection to gas vents
or chimneys, vent installations shall be in
accordance with “Venting of Equipment,”
of the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, or “Venting
Systems and Air Supply for Appliances,”
of the Natural Gas and Propane
Installation Code, CAN/CSA B149.1, or
applicable provisions of the local building
codes.
WARNING!!!
When utilizing
the single pipe vent method,
provisions for combustion
and ventilation air must be
in accordance with Air for
Combustion and Ventilation, of
the latest edition of the National
Fuel Gas Code, ANSI Z223.1,
in Canada, the latest edition of
CGA Standard B149 Installation
Code for Gas Burning Appliances
and Equipment, or applicable
provisions of the local building
codes.
Commercial applications utilizing this
heater may be installed with a single
pipe carrying the fl ue products to the
outside while using combustion air from
the equipment room. In this case the
following conditions and considerations
must be followed.
WARNING!!!
The
equipment room MUST be
provided with properly sized
openings to assure adequate
combustion air from outside.
Failure to comply could result in
severe personal injury, death, or
substantial property damage.
NOTICE! There will be a noticeable
increase in the noise level during
normal operation from the inlet air
opening.
NOTICE! Vent system and terminations
must comply with the venting
instructions set forth in Sections
11.1, 11.2, 11.3, 11.4, 11.5, 11.7,
11.8 and 11.9.
WARNING!!!
Use only
the materials, vent systems, and
terminations listed in
Figures
11-7 and 11-8
. DO NOT mix vent
systems of different types or
manufacturers, unless listed in this
manual. Failure to comply could
result in severe personal injury,
death, or substantial property
damage.
WARNING!!!
Fire danger
due to fl ammable materials or
liquids. Do not store fl ammable
materials and liquids in the
immediate vicinity of the heater.
WARNING!!!
Heater
must be clear and free from
combustible materials, gasoline
and other fl ammable vapors and
liquids, and corrosive liquids and
vapors. Never use chlorine and
hydrocarbon containing chemicals
(such as spray chemicals, solution
and cleaning agents, paints,
glues etc.) in the vicinity of the
heater. Do not store and use
these chemicals in the heater
room. Avoid excessive dust
formation and build-up. Failure
to comply could result in fi re,
severe personal injury, death, or
substantial property damage.
WARNING!!!
Where exhaust
fans, clothes dryers, and kitchen
ventilation systems interfere
with the operation of appliances,
makeup air shall be provided.
Failure to follow this warning
could result in excessive levels of
carbon monoxide, which can result
in severe personal injury or death!
NOTICE! For installation in Canada, vent
pipe system must be certifi ed to ULC-S636
(see Table 10-1).
NOTICE All vent pipes connections
must be secured following manufacturer
instruction, properly supported, and the
exhaust must be pitched a minimum of
a 1/4 inch per foot back to the heater (to
allow drainage of condensate).
NOTICE! Vent pipe system shall
be installed in a way
to prevent
accumulation of condensate;
11.10.1 - Combustion Air
and Ventilation openings
WARNING!!!
Make sure that
combustion air and ventilation
openings are suffi ciently sized
and no reduction or closure of
openings takes place. Please note
these restrictions and its dangers
to the operator of the heater and to
the homeowner.Failure to comply
could result in severe personal
injury, death, or substantial
property damage.
Outdoor combustion air shall be provided
through opening(s) to the outdoors.
Two Permanent Openings Method.
Two permanent openings, one
commencing within 12 in. (300 mm)
of the top and one commencing within
12 in. (300 mm) of the bottom, of the
room shall be provided. The openings
shall communicate directly, or by ducts,
with the outdoors or spaces that freely
communicate with the outdoors, as
follows:
1. Where directly communicating with the
outdoors or where communicating to
the outdoors through vertical ducts,
each opening shall have a minimum
free area of 1 in
2
each 4000 Btu/hr
(550 mm
2
/kW) of total input rating of
all appliances located in the room.
2. Where communicating with the
outdoors through horizontal ducts,
each opening shall have a minimum
free area of 1 in
2
each 2000 Btu/hr
(1100 mm
2
/kW) of total input rating of
all appliances located in the room.
One Permanent Opening Method. One
permanent opening, commencing within
12 in. (300 mm) of the top of the room,
shall be provided. The appliances shall
have clearances of at least 1 in. (25 mm)
from the sides and back and 6 in. (150
mm) from the front of the appliance.
The opening shall directIy communicate
with the outdoors or shall communicate
through a vertical or horizontal duct
to the outdoors or spaces that freely
communicate with the outdoors and shall
have a minimum free area of 1 in
2
each
11 - INSTALLATION - Vent and combustion air
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