Instruction manual

27
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. Refer to the “propane
gas and/or High Altitude Installations” section for details.
Gas Valve
This unit is equipped with a 24 volt gas valve controlled
during furnace operation by the integrated control module.
As shipped, the valve is configured for natural gas. The
valve is field convertible for use with propane gas by
replacing the regulator spring with a propane gas spring
from an appropriate manufacturer’s propane gas conver-
sion kit. Taps for measuring the gas supply pressure and
manifold pressure are provided on the valve.
The gas valve has a manual ON/OFF control located on
the valve itself. This control may be set only to the “ON” or
“OFF” position. Refer to the lighting instructions label or
the “Putting the Furnace Into Operation” section for use of
this control during start up and shut down periods.
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 will operate simultaneously when sizing a trunk line.
The gas piping supplying the furnace must be properly
sized based on the gas flow required, specific gravity of the
gas, and length of the run. The gas line installation must
comply with local codes, or in their absence, with the latest
edition of the National Fuel Gas Code, NFPA 54/ANSI
Z223.1.
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)
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.
The following stipulations apply when connecting gas
piping. Refer to the previous figures 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.
• Install a 1/8" NPT pipe plug fitting, accessible for test
gage connection, immediately upstream of the gas
supply connection to the furnace.
• Use two pipe wrenches when making connection to
the gas valve to keep it from turning. The orientation
of the gas valve on the manifold must be maintained as
shipped from the factory.
• Install a manual shutoff valve between the gas meter
and unit within six feet of the unit. If a union is installed,
the union must be downstream of the manual shutoff
valve, between the shutoff valve and the furnace.
• Tighten all joints securely.
• Connect the furnace to the building piping by one of the
following methods:
– Rigid metallic pipe and fittings.
– Semi-rigid metallic tubing and metallic fittings.
Aluminum alloy tubing must not be used in exte-
rior locations. In order to seal the grommet
cabinet penetration, rigid pipe must be used to
reach the outside of the cabinet. A semi-rigid
connector to the gas piping may be used from
there.
• Use listed gas appliance connectors in accordance
with their instructions. Connectors must be fully in the
same room as the furnace.z