8
WARNING
To prevent death or serious illness to
building occupants due to flue products
leaking into the building, proper installation
of gaskets and screws is essential for
providing a gas tight seal between the
partition panel and the induced draft blower.
V. Gas Supply and Piping
GENERAL
The furnace rating plate includes the approved furnace gas
input rating and gas types. The furnace must be equipped
to operate on the type of gas applied. This includes any
conversion kits required for alternate fuel and/or high alti-
tude.
CAUTION
To prevent unreliable operation or
equipment damage, the inlet gas supply
pressure must be as specified on the unit
rating plate with all other household gas
fired appliances operating.
Inlet gas supply pressures must be maintained within the
ranges specified below. The supply pressure must be
constant and available with all other household gas fired
appliances operating. The minimum gas supply pressure
must be maintained to prevent unreliable ignition. The
maximum must not be exceeded to prevent unit overfiring.
Inlet Gas Pressure
Natural
Min. 5.0" W.C., Max. 10.0" W.C.
Propane
Min. 11.0" W.C., Max. 13.0" W.C.
Inlet gas pressure must not exceed the maximum value
shown in table above.
NOTE:
Adjusting the minimum supply pressure below the
limits in the above table could lead to unreliable ignition.
Gas input to the burners must not exceed the rated input
shown on the rating plate. Overfiring of the furnace could
result in premature heat exchanger failure. Gas pressures
in excess of 13 inches water column could result in perma-
nent damage to the gas valve.
At all altitudes, the manifold pressure must be within 0.3
inches WC of that listed on the “Specification Sheet” for the
fuel used. At all altitudes and with either fuel, the air
temperature rise must be within the range listed on the
furnace nameplate.
High Altitude Derate
When this furnace is installed at high altitude, the appropri-
ate High Altitude orifice kit must be applied. 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. Refer
to the product Specification Sheet or an Amana distributor
for a tabular listing of appropriate altitude ranges and
corresponding manufacturer’s high altitude (Natural, Pro-
pane Gas, and/or Pressure Switch) kits.
Do
not
derate the furnace by adjusting the manifold pres-
sure to a lower pressure than specified on the furnace rating
plate. The combination of the lower air density and a lower
manifold pressure will prohibit the burner orifice from draw-
ing 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
3
content of the
derated gas and the altitude. Refer to the National Fuel Gas
Code, NFPA 54/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 altitude
regardless of the BTU/ft
3
content of the fuel used. Refer to
the product Specification Sheet or an Amana distributor for
a tabular listing of appropriate altitude ranges and corre-
sponding manufacturer’s pressure switch kits.
Propane Gas Conversion
WARNING
Possible death, personal injury or property
damage may occur if the correct conversion
kits are not installed. The appropriate kits
must be applied to ensure safe and proper
furnace operation. All conversions must
be performed by a qualified installer or
service agency.
This unit is configured for natural gas. The appropriate
manufacturer’s propane gas conversion kit, must be ap-
plied for propane gas installations. Propane gas installa-
tions require an orifice change to compensate for the
energy content difference between natural and propane
gas.
Refer to the product Specification Sheet or contact an
Amana distributor for a tabular listing of appropriate
manufacturer’s kits for propane gas and/or high altitude
installations. The indicated kits must be used to ensure
safe and proper furnace operation. All conversions must be
performed by a qualified installer, or service agency.
