Gas Piping - Amana GUI Installation Instructions Manual

For sizing of flexible liners, see Note 22 and the tables in
the National Fuel Gas Code, NFPA 54 / ANSI Z223.1 -
latest edition and in the National Standard of Canada,
CAN/CGA B149.1 and .2 - latest editions and amend-
ments.
To install the liner, read and follow the liner manufacturer's
instructions and your local codes. Excess liner length
should be pulled out of the chimney and cut off. Use
caution when doing this, as the cut edges of flexible liners
may be sharp. Do not spiral excess liner inside of the
chimney. Support the liner as recommended by the liner
manufacturer.
Some manufacturers of flexible liners offer an insulation
sleeve designed to be added to the liner before it is
installed in the chimney. (Poured insulation, either ver-
miculite or other materials, is no longer recommended.)
Insulation will need to be added to the flexible liner if:
•
It is required by the liner manufacturer's instructions.
•
The previous liner was properly sized and installed,
and suffered from condensation damage.
•
It is required by your local building codes.
Even if none of those three conditions exist which require
additional liner insulation, the installer may wish to con-
sider it if:
• The local climate is very cold
• The chimney is very tall
• The vent connectors used are very long or have a
large number of elbows
• Local experience indicates that flexible liners in-
stalled without insulation are likely to have condensa-
tion problems.
Insulation must be selected and installed in accordance
with the liner manufacturer's instructions.
Finally, cap the chimney and terminate the liner in
accordance with the liner manufacturer's instructions.
VI. Gas Piping
The rating plate is stamped with the model number, type
of gas and gas input rating. Make sure the furnace is
equipped to operate on the type of gas available.
Inlet Gas Pressure
Natural Min. 5.0" W.C., Max. 10.0" W.C.
Propane Min. 11.0" W.C., Max. 14.0" 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 pres-
sures in excess of 14 inches water column could result in
permanent damage to the gas valve.
IMPORTANT NOTE: The furnace will naturally derate
itself with altitude. Do not attempt to increase the firing
rate by changing orifices or increasing the manifold
pressure. This can cause poor combustion and equip-
ment failure.
At all altitudes, the manifold pressure must be within 0.3
inches W.C. 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.

Gas Piping

IMPORTANT NOTE: To avoid possible unsatisfactory
operation or equipment damage due to underfiring of
equipment, do not undersize the natural/propane gas
piping from the meter/tank to the furnace. Include all
appliances which may be operated simultaneously when
sizing a trunk line.
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 ANSI
Z223.1.
Natural Gas Capacity of Pipe
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)
13
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