Air For Combustion And Ventilation - Trane UHMB060ACV3VA Installer's Manual

Installer's Guide
5
The furnace must be supported at both ends and
the middle when installed horizontally. The fur-
nace must also be elevated approximately 4-6
inches to allow clearance for the condensate drain
to exit the cabinet in the horizontal position.
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 fur-
nace. The rods need to be of sufficient length to allow
for proper clearances from combustible materials. The
frame needs to be at least 32" in length to allow for ac-
cess 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.

AIR FOR COMBUSTION AND VENTILATION

If these furnaces are installed in a nondirect vent capac-
ity then the adequate flow of combustion and ventilat-
ing air must not be obstructed from reaching the fur-
nace. Air openings provided for combustion air must be
kept free of obstructions which restrict the flow of air.
Airflow restrictions affect the efficiency and safe opera-
tion 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 — CAN/CGA B149.1 or ap-
plicable provisions of the local building codes. Special
conditions created by mechanical exhausting of air and
6
50 CU. FT. OR MORE
PER 1000 BTU/HR. INPUT
ALL EQUIP. INSTALLED
UNCONFINED
8
fireplaces must be considered to avoid unsatisfactory
furnace operation.
OUTSIDE AIR IS RECOMMENDED
The use of indoor air for most applications is acceptable,
unless there is the presence of corrosive chemicals or
contamination. Certain types of installation will require
the use of outside air for combustion.
UPFLOW/
HORIZONTAL
The following types of installations will require use of
SHOWN WITH
OUTDOOR AIR for combustion, due to chemical expo-
DIRECT VENT
sures:
* Commercial buildings
* Buildings with indoor pools
* Furnaces installed in "confined" laundry rooms
* Furnaces installed in "confined" hobby or craft
rooms
* Furnaces installed near chemical storage areas.
Exposure to the following substances in the combustion
air supply will also require OUTDOOR AIR for combus-
tion:
* Permanent wave solutions
* Chlorinated waxes and cleaners
* Chlorine based swimming pool chemicals
* Water softening chemicals
* Deicing salts or chemicals
* Carbon Tetrachloride
* Halogen type refrigerants
* Cleaning solvents (such as perchloroethylene)
* Printing inks, paint removers, varnish, etc.
* Hydrochloric acid
* Cements and glues
* Antistatic fabric softeners for clothes dryers
* Masonry acid washing materials
Furnace locations may be in a "confined space" or an
"unconfined space".
Unconfined space is defined in Figure 6. These spaces
may have adequate air by infiltration to provide air for
combustion and ventilation. Buildings with tight
construction (for example, weather stripping, heavily
insulated, caulked, vapor barrier, etc.), may need addi-
tional air to be provided as described for confined space.
See Table 2 for minimum area.
FOR UNCONFINED SPACE INSTALLATIONS
FURNACE
MAXIMUM BTUH
INPUT RATING
TABLE 2
MINIMUM AREA IN SQUARE FEET
WITH 8 FT. CEILING
MINIMUM AREA IN SQUARE FEET
OF UNCONFINED SPACE
60,000
80,000
100,000
120,000
375
500
625
875
18-CD30D1-9