Gas Piping Connections; I Nstallation - Amana GUI Installation Instructions Manual

H A D
IGH LTITUDE ERATE
When this furnace is installed at high altitude, the appropriate High
Altitude orifice kit must be applied. This is required due to the natu-
ral reduction in the density of both the gas fuel and combustion air
as altitude increases. The kit will provide the proper design certi-
fied input rate within the specified altitude range.
High altitude kits are purchased according to the installation alti-
tude and usage of either natural or propane gas. Contact your dis-
tributor for a tabular listing of appropriate altitude ranges and corre-
sponding manufacturer's high altitude (Natural, Propane gas, and/
or Pressure Switch) kits.
Do not derate the furnace by adjusting the manifold pressure to a
lower pressure than specified on the furnace rating plate. The com-
bination of the lower air density and a lower manifold pressure will
prohibit 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 artifi-
cially derated, the appropriate orifice size must be determined based
upon the BTU/ft content of the derated gas and the altitude. Refer
3
to the National Fuel Gas Code, NFPA 54/ANSI Z223.1, and infor-
mation provided by the gas supplier to determine the proper orifice
size.
A different pressure switch may be required at high altitude regard-
less of the BTU/ft content of the fuel used. Contact your distributor
3
for a tabular listing of appropriate altitude ranges and correspond-
ing manufacturer's pressure switch kits.
P G C
ROPANE AS ONVERSION
P
OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF
THE CORRECT CONVERSION KITS ARE NOT INSTALLED.
MUST BE APPLIED TO INSURE SAFE AND PROPER FURNACE OPERATION.
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 applied for pro-
pane gas installations. Refer to the "Propane Gas and/or High Alti-
tude Installations" section for details.
Contact your distributor for a tabular listing of appropriate
manufacturer's kits for propane gas and/or high altitude installa-
tions. The indicated kits must be used to insure safe and proper
furnace operation. All conversions must be performed by a quali-
fied installer, or service agency.
G P C
AS IPING ONNECTIONS
G
ENERAL
T
O 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.
WARNING
T
HE APPROPRIATE KITS
CAUTION
Length of
Pipe in Feet
10
20
30
40
50
60
70
80
90
100
(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. Re-
fer to Figure 13 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.
A
LL
•
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 exterior
locations.
–
Use listed gas appliance connectors in accordance with
their instructions. Connectors must be fully in the same
room as the furnace.
–
Protect connectors and semi-rigid tubing against
physical and thermal damage when installed. Ensure
aluminum-alloy tubing and connectors are coated to
protect against external corrosion when in contact with
masonry, plaster, or insulation, or subjected to repeated
wetting by liquids such as water (except rain water),
detergents, or sewage.
18
Natural Gas Capacity of Pipe
In Cubic Feet of Gas Per Hour (CFH)
Nominal Black Pipe Size
1/2" 3/4" 1"
132 278 520
92 190 350
73 152 285
63 130 245
56 115 215
50 105 195
46 96 180
43 90 170
40 84 160
38 79 150
1 1/4" 1 1/2"
1050 1600
730 1100
590 980
500 760
440 670
400 610
370 560
350 530
320 490
305 460