Air For Combustion And Ventilation - Trane *UH2B060A9V3VA Installer's Manual

The horizontal Furnace may also be suspended from the
joists using all-thread rods with a substantial metal support
frame that supports the entire length of the furnace. The
rods need to be of sufficient length to allow for proper clear-
ances from combustible materials. The frame needs to be at
least 32" in length to allow for access to service panels.
If the Furnace is suspended using steel strap, it must be
supported at all four corners and in the middle at the front of
the Furnace.
Figure 7
CASED COIL CONNECTION
BRACKET FOR DOWNFLOW
FURNACE IN HORIZONTAL
DOWNFLOW ONLY
Figure 8

AIR FOR COMBUSTION AND VENTILATION

The following warning complies with State of California law, Proposition 65.
WARNING
!
HAZARDOUS GASES!
EXPOSURE TO FUEL SUBSTANCES OR BY-PRODUCTS
OF INCOMPLETE FUEL COMBUSTION IS BELIEVED BY
THE STATE OF CALIFORNIA TO CAUSE CANCER,
BIRTH DEFECTS, OR OTHER REPRODUCTIVE HARM.
Adequate flow of combustion and ventilating air must not be
obstructed from reaching the Furnace. Air openings provided
in the Furnace casing must be kept free of obstructions which
restrict the flow of air. Airflow restrictions affect the efficiency
and safe operation of the Furnace. Keep this in mind should
you choose to remodel or change the area which contains your
Furnace. Furnaces must have a free flow of air for proper
performance.
Provisions for combustion and ventilation air shall be made
in accordance with "latest edition" of Section 5.3, Air for
Combustion and Ventilation, of the National Fuel Gas Code,
ANSI Z223.1, or Sections 7.2, 7.3 or 7.4 of CSA B149.1
Installation Codes, and applicable provisions of the local
building codes. Special conditions created by mechanical
exhausting of air and fireplaces must be considered to avoid
unsatisfactory Furnace operation.
UNCONFINED
50 CU. FT. OR MORE
PER 1000 BTU/ HR. INPUT
ALL EQUIP. INSTALLED
Figure 9
Furnace locations may be in a confined space (see Figure 10)
or an unconfined space (See Figure 9).
18-CD26D1-10
Unconfined space is defined in Table 3 and Figure 9. These
spaces may have adequate air by infiltration to provide air
for combustion, ventilation, and dilution of flue gases.
Buildings with tight construction (for example, weather
stripping, heavily insulated, caulked, vapor barrier, etc.), may
UPFLOW/
need additional air provided as described for confined space.
HORIZONTAL
SHOWN WITH
1.All air from inside the building as in Figure 11: The con-
DIRECT VENT
Confined spaces are installations with less than 50 cu. ft. of
space per 1000 BTU/ hr input from all equipment installed.
Confined space is defined in Figure 10. Air for combustion
and ventilation requirements can be supplied from inside the
building as in Figure 11 or from the outdoors, as in Figure 12.
Installer's Guide
Table 3
MINIMUM AREA IN SQUARE FEET
FOR UNCONFINED SPACE INSTALLATIONS
FURNACE
MAXIMUM BTUH MINIMUM AREA IN SQUARE
INPUT RATING FEET OF UNCONFINED SPACE
60,000
80,000
100,000
120,000
140,000
fined space shall be provided with two permanent
openings communicating directly with an additional
room(s) of sufficient volume so that the combined volume
of all spaces meets the criteria for an unconfined space.
The total input of all gas utilization equipment installed
in the combined space shall be considered in making this
determination. Refer to Table 4, for minimum open
areas required.
2. All air from outdoors as in Figure 12: The confined space
shall be provided with two permanent openings, one
commencing within 12 inches of the top and one com-
mencing within 12 inches of the bottom of the enclosure.
The openings shall communicate directly, or by ducts,
with the outdoors or spaces (crawl or attic) that freely
communicate with the outdoors. Refer to Table 4, for
minimum open areas required.
CONFINED
LESS THAN 50 CU. FT.
PER 1000 BTU/HR. INPUT
ALL EQUIP INSTALLED
Figure 10
Table 4
MINIMUM FREE AREA IN SQUARE INCHES
EACH OPENING (FURNACE ONLY)
Furnace
Maximum Air
BTUH/INPUT From
Rating Inside
60,000 100
80,000 100
100,000 100
120,000 120
140,000 140
3. The following types of installations will require use of
OUTDOOR AIR for combustion, due to chemical
exposures:
* Commercial buildings
* Buildings with indoor pools
* Furnaces installed in commercial laundry rooms
* Furnaces installed in hobby or craft rooms
WITH 8 FT. CEILING
375
500
625
750
875
Air From Outside
Vertical Horizontal
Duct Duct
15 30
20 40
25 50
30 60
35 70
9