13
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 insure 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 a pressure switch and 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 insure safe
and proper furnace operation. All conversions must be
performed by a qualified installer, or service agency.
GAS PIPING CONNECTIONS
General
CAUTION
To avoid possible unsatisfactory operation
or equipment damage due to underfiring of
equipment, use the proper size of
natural/propane gas piping needed when
running pipe from the meter/tank to the
furnace.
When sizing a trunk line, be sure to include all appliances
which may be operated simultaneously.
The gas pipe supplying the furnace must be properly sized
based on gas flow required, specific gravity of the gas and
length of the run. The gas line installation must comply with
local codes, or in the absence of local codes, with the latest
edition of the National Fuel Gas Code NFPA 54/ANSI
Z223.1.
To connect the furnace to the building’s gas piping, the
installer must supply a ground joint union, drip leg, manual
shutoff valve, and line and fittings to connect to gas valve.
In some cases, the installer may also need to supply a
transition piece from 1/2" pipe to a larger pipe size. To
connect the furnace to the building’s gas piping, the installer
must supply a ground joint union, drip leg, manual shutoff
valve, and line and fittings to connect to gas valve. In some
cases, the installer may also need to supply a transition
piece from 1/2" pipe to a larger pipe size.
Natural Gas Capacity of Pipe
In Cubic Feet of Gas Per Hour (CFH)
Length of
Nominal Black Pipe Size
Pipe in Feet
1/2"
3/4"
1"
1 1/4"
1 1/2"
10
132
278
520
1050
1600
20
92
190
350
730
1100
30
73
152
285
590
980
40
63
130
245
500
760
50
56
115
215
440
670
60
50
105
195
400
610
70
46
96
180
370
560
80
43
90
170
350
530
90
40
84
160
320
490
100
38
79
150
305
460
(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on
0.60 Specific Gravity Gas)
CFH = BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
The following stipulations apply when connecting gas pip-
ing. Refer to Figure 12 for typical gas line connections to the
furnace.
•
Use black iron or steel pipe and fittings for the building
piping.
•
Use pipe joint compound on male threads only. Pipe
joint compound must be resistant to the action of the
fuel used.
•
Use ground joint unions.
•
Install a drip leg to trap dirt and moisture before it can
enter the gas valve. The drip leg must be a minimum
of three inches long.
