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Seal off a nondirect vent furnace if it is installed near an area
frequently contaminated by any of the above substances.
This protects the nondirect vent furnace from airborne
contaminants. To ensure that the enclosed nondirect vent
furnace has an adequate supply of combustion air, vent from
a nearby uncontaminated room or from outdoors. Refer to
"Combustion and Ventilation Air Requirements."
If the furnace is used in connection with a cooling unit, install
the furnace upstream or in parallel with the cooling unit.
Premature heat exchanger failure will result if the cooling unit
is placed ahead of the furnace.
If the furnace is installed in a residential garage, position the
furnace so that the burners and ignition source are located
not less than 18" (45.7 cm) above the floor. Protect the
furnace from physical damage by vehicles.
If the furnace is installed horizontally, the furnace access
doors must be vertical so that the burners fire horizontally
into the heat exchanger.
NOTE: Do not install the unit with the access doors on the
"up/top" or "down/bottom" side of the furnace.
Installation Clearances and Accessibility
The minimum clearance information for this furnace is
provided on the furnace's clearance label. These clearances
must be permanently maintained.
Clearances must accommodate an installation's gas,
electrical, drain trap and drain line connections.
If the alternate combustion air intake or vent/flue connections
are used, additional clearance must be provided to
accommodate these connections. See "Plan Vent System."
A furnace installed in a confined space (for example, a closet
or utility room) must have 2 ventilation openings with a total
minimum free area of 0.25 sq. in. (1.6 cm
furnace input rating. Refer to Specification Sheet applicable
to your model for minimum clearances to combustible
surfaces. One of the ventilation openings must be within 12"
(30.5 cm) of the top; the other opening must be within 12"
(30.5 cm) of the bottom of the confined space. In a typical
construction, the clearance between the door and door frame
is usually adequate to satisfy this ventilation requirement.
All servicing and cleaning of the furnace can be performed
from the front. If installed in a closet or utility room, provide
24" (61 cm) clearance in front for service if the door to the
room is not in line with the front of the furnace. Where
servicing clearances are greater than clearances to
combustibles, servicing clearances take precedence.
A
B
B
Upflow
Counterflow
C
A. Top
B. Side
6
2
) per 1,000 Btu/h of
A
B
C
Horizontal
C. Bottom
High Altitude Installations
High Altitude Derate
When this furnace is installed at high altitudes, the appropriate
high altitude orifice kit must be used. This is required due to the
natural reduction in the density of both the gas fuel and
combustion air as altitude increases. The kit will provide the
proper design-certified input rate within the specified altitude
range.
High altitude kits are purchased according to the installation
altitude and usage of either Natural or propane gas. Contact your
local distributor for a tabular listing of appropriate altitude ranges
and corresponding manufacturer's high altitude (Natural, propane
gas and/or pressure switch) kits.
NOTE: Do not derate the furnace by adjusting the manifold
pressure to a lower pressure than specified on the furnace rating
plate. The combination of the lower air density and a lower
manifold pressure will keep the burner orifice from drawing the
proper amount of air into the burner. This may cause incomplete
combustion, flashback and possible yellow tipping.
In some areas, the gas supplier may artificially derate the gas in
an effort to compensate for the effects of altitude. If the gas is
artificially derated, the appropriate orifice size must be
determined based upon the Btu/ft
and the altitude. Refer to the National Fuel Gas Code, NFPA54/
ANSI Z223.1 and information provided by the gas supplier to
determine the proper orifice size.
A different pressure switch may be required at high altitudes
regardless of the Btu/ft
3
content of the fuel used. Contact your
local distributor for a tabular listing of appropriate altitude ranges
and corresponding manufacturer's pressure switch kits.
Propane Gas/High Altitude Installations
WARNING
Goodman 52
Possible property damage, personal injury or death may
occur if the correct conversion kits are not installed. The
appropriate kits must be applied to insure safe and proper
furnace operation. All conversions must be performed by
a qualified installer or service agency.
This furnace is shipped from the factory configured for Natural
gas at standard altitude. Propane gas installations require an
orifice change to compensate for the energy content difference
between Natural and propane gas.
High altitude installations may require both a pressure switch and
an orifice change. These changes are necessary to compensate
for the natural reduction in the density of both the gas fuel and
the combustion air at higher altitude.
3
content of the derated gas
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