RBI Infinite Energy2 IW1000, Installation And Operation Instructions Manual

Page: 34 / 156

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* Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through
a duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2
Openings. The above requirements are for the appliance only; additional gas fired appliances in the equipment room will
require an increase in the net free area to supply adequate combustion air for all appliances.
Combustion air requirements are based on the latest edition of the National Fuel Gas, ANSI Z223.1; in Canada refer to the
latest edition of CGA Standard CAN B142.2. Check all local code requirements for combustion air.
All dimensions based on net free area in square inches. Metal louvers or screens reduce the free area of a combustion
air opening a minimum of approximately 25%. Check with louver manufacturers for exact net free area of louvers. Where
two openings are provided, one must be within 12” (30 cm) of the ceiling and one must be within 12” (30 cm) of the floor of
the equipment room. Each opening must have net free area as specified in the chart on Figure 5-4. Single openings shall
commence within 12” (30 cm) of the ceiling.
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
Model
Number
* Outside Air from
2 openings Directly from
Outdoor
* Outside Air from
1 Opening Directly from
Outdoors, in
2
Inside Air from
2 Ducts Delivered from
Outdoors
Top
Opening, in
2
Bottom
Opening, in
2
Top
Opening, in
2
Bottom
Opening, in
2
199
50
(323 cm
2
)
50
(323 cm
2
)
67
(433 cm
2
)
100
(646 cm
2
)
100
(646 cm
2
)
399
100
(646 cm
2
)
100
(646 cm
2
)
134
(865 cm
2
)
200
(1201 cm
2
)
200
(1201 cm
2
)
500
125
(807 cm
2
)
125
(807 cm
2
)
167
(1078 cm
2
)
250
(1613 cm
2
)
250
(1613 cm
2
)
750
188
(1213 cm
2
)
188
(1213 cm
2
)
250
(1613 cm
2
)
375
(2420 cm
2
)
375
(2420 cm
2
)
1000
250
(1613 cm
2
)
250
(1613 cm
2
)
334
(2155 cm
2
)
500
(3226 cm
2
)
500
(3226 cm
2
)
5 - INSTALLATION - Location
Figure 5-4 Minimum recommended combustion air supply to equipment room
WARNING!!!
Under no
circumstances should the
equipment room ever be under
negative pressure. Particular
care should be taken where
exhaust fans, attic fans, clothes
dryers, compressors, air
handling units, etc., may take
away air from the unit.
WARNING!!!
EXHAUST
FANS: Any fan or equipment
which exhaust air from the
equipment room may deplete the
combustion air supply and/or
cause a downdraft in the venting
system. spillage of flue products
from the venting system into an
occupied living space can cause
a very hazardous condition that
must be immediately corrected.
Failure to follow this warning
could result in excessive levels
of carbon monoxide, wich can
cause severe personal injury or
death.
WARNING!!!
The
combustion air supply must
be completely free of any
flammable vapors that may
ignite or chemical fumes
wich must be avoided are
fluorocarbons and other
halogenated compounds,
most commonly present as
refrigerants or solvents, such
as Freon, trichlorethylene,
perchlorethylene, chlorine, etc.
These chemicals, when burned,
form acids which quickly attack
the heat exchanger tubes,
headers, flue collectors, and the
vent system.