Bryant GAMA 331JAV - Manual (Page 4)

I. LOCATION
A. General
CAUTION: DO NOT install furnace in a corrosive or
contaminated atmosphere. Make sure all combustion and
circulating air requirements are followed.
DO NOT use this furnace during construction when
adhesives, sealers, and/or new carpets are being installed
and curing. If the furnace is required during construction,
use clean outside air for combustion and ventilation.
Compounds of chlorine and fluorine when burned in
combustion air form acids which will cause corrosion of
the heat exchangers and metal vent systems. Some of
these compounds are released from paneling and dry wall
adhesives, paints, thinners, masonry cleaning materials,
and many other solvents commonly used in the construc-
tion process.
Excessive exposure to contaminated combustion air will
result in safety and performance related problems.
This furnace must be installed so electrical components are
protected from water.
Locate furnace as near to center of air distribution system and
chimney or vent as possible. The furnace should be installed as
level as possible.
When furnace is installed so that supply ducts carry air to areas
outside space containing furnace, the return air must also be
handled by a duct(s) sealed to furnace casing and terminating
outside space containing furnace.
Provide ample space for servicing and cleaning. Always comply
with minimum fire protection clearances shown on unit clearance
label. This furnace shall not be installed directly on carpeting, tile,
or any combustible material other than wood flooring. The furnace
may be installed on combustible flooring when installed with
accessory downflow subbase, which is available from your dis-
tributor or branch when required.
B. Location Relative to Cooling Equipment
The cooling coil must be installed parallel with or on downstream
side of furnace to avoid condensation in heat exchangers. When
installed parallel with furnace, dampers or other means used to
control the flow of air must prevent chilled air from entering
furnace. If dampers are manually operated, they must be equipped
with means to prevent operation of either unit unless damper is in
full-heat or full-cooling position.
C. Hazardous Locations
When furnace is installed in a residential garage, it must be
installed so that burners and ignition source are at least 18 in.
above floor. The furnace should be protected from physical
damage by vehicles.
When furnace is installed in public garages, airplane hangars, or
other buildings having hazardous atmospheres, unit must be
installed in accordance with recommended good practice require-
ments of the National Fire Protection Association, Inc.
II. AIR FOR COMBUSTION AND VENTILATION
Provisions for adequate combustion and ventilation air must be
provided in accordance with Section 5.3, Air for Combustion and
Ventilation, of the NFGC or applicable provisions of local building
codes.
Canadian installations must be in accordance with NSCNGPIC
and all authorities having jurisdiction.
CAUTION: Air for combustion must not be contami-
nated by halogen compounds which include fluoride,
chloride, bromide, and iodide. These elements are found
in aerosol sprays, detergents, bleaches, cleaning solvents,
salts, air fresheners, and other household products.
CAUTION: The operation of exhaust fans, kitchen ven-
tilation fans, clothes dryers, or fireplaces could create a
negative air pressure condition at the furnace. Make-up
air must be provided for these devices, in addition to that
required by the furnace.
All fuel-burning equipment must be supplied with air for combus-
tion of the fuel. Sufficient air MUST be provided to ensure there
will not be a negative pressure in equipment room or space. In
addition, a positive seal MUST be made between furnace cabinet
and return-air duct to avoid pulling air from the burner area and
draft safeguard opening into circulating air.
The requirements for combustion and ventilation air depend upon
whether furnace is located in a CONFINED or UNCONFINED
space.
A. Unconfined Space
An unconfined space must have at least 50 cu ft for each 1000
Btuh of input for all appliances (such as furnaces, clothes dryer,
water heaters, etc.) in the space.
For Example:
331JAV FURNACE
HIGH-FIRE INPUT
BTUH
MINIMUM SQ FT
WITH
7-1/2 FT CEILING
63,000 420
84,000 560
105,000 700
If the unconfined space is constructed unusually tight, air for
combustion and ventilation MUST come from either the outdoors
or spaces freely communicating with outdoors. Combustion and
ventilation openings must be sized the same as for a confined
space as defined below. Return air must not be taken from the
room unless equal or greater amount of air is supplied to the room.
B. Confined Space
A confined space is defined as a space whose volume is less than
50 cu ft per 1000 Btuh of total input ratings of all appliances
installed in that space. A confined space MUST have provisions
for supplying air for combustion, ventilation, and dilution of flue
gases using 1 of the following methods.
NOTE: In determining free area of an opening, the blocking
effect of louvers, grilles, and screens must be considered. If free
area of louver or grille design is unknown, assume that wood
louvers have a 20 percent free area and metal louvers or grilles
have a 60 percent free area. Screens, when used, must not be
smaller than 1/4-in. mesh. Louvers and grilles must be constructed
so they cannot be closed.
The size of the openings depends upon whether air comes from
outside of the structure or an unconfined space inside the structure.
1. All air from an unconfined space inside the structure
requires 2 openings (for structures not usually tight):
a. Each opening MUST have at least 1 sq in. of free area
per 1000 Btuh of total input for all equipment within the
confined space, but not less than 100 sq in. per opening.
(See Fig. 3 and Table 2.) The minimum dimension of air
openings shall not be less than 3 in.
b. If the building is constructed unusually tight, a perma-
nent opening directly communicating with the outdoors
shall be provided. (See item 2 below.)
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