General; Gas Piping Connections - Amana AMV9 Installation Instructions Manual

Inlet Gas Supply Pressure
Natural Gas Minimum:5.0" W.C. Maximum :10.0" W.C.
Propane Gas Minimum:11.0" W.C. Maximum :13.0" W.C.
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 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 distributor
for a tabular listing of appropriate altitude ranges and corresponding
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 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 regard-
3
less of the BTU/ft content of the fuel used. Contact your distributor
for a tabular listing of appropriate altitude ranges and corresponding
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 propane gas instal-
lations. Refer to the Section VIII, Propane Gas / High Altitude Instal-
lations section for details.
G V
AS ALVE
This unit is equipped with a 24 volt gas valve controlled during fur-
nace 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 pro-
pane gas spring from an appropriate manufacturer's propane gas
conversion 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 Section XIV, Startup Proce-
dure & Adjustment for use of this control during start up and shut
down periods.
WARNING
T
HE APPROPRIATE KITS
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.
In Cubic Feet of Gas Per Hour (CFH)
Length of
Pipe in Feet 1/2"
10 132
20 92
30 73
40 63
50 56
60 50
70 46
80 43
90 40
100 38
(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
A
LL
size.
The following stipulations apply when connecting gas piping. Refer
to Gas Piping Connections figure 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.
24
CAUTION
Natural Gas Capacity of Pipe
Nominal Black Pipe Size
3/4" 1" 1 1/4"
278 520 1050
190 350 730
152 285 590
130 245 500
115 215 440
105 195 400
96 180 370
90 170 350
84 160 320
79 150 305
1 1/2"
1600
1100
980
760
670
610
560
530
490
460