Checking The Gas Piping - Amana AIR COMMAND 80 Manual

8. The furnace shall be connected to the building piping by
one of the following:
a. Rigid metallic pipe and fittings.
b. Semirigid metallic tubing and metallic fittings. Alumi-
num alloy tubing shall not be used in exterior
locations.
c. Listed gas appliance connectors used in accordance
with the terms of their listing that are completely in the
same room as the equipment.
d. In "b" and "c" above, the connector or tubing shall be
installed so as to be protected against physical and
thermal damage. Aluminum-alloy tubing and connec-
tors shall be coated to protect against external corro-
sion where they are in contact with masonry, plaster,
or insulation or are subject to repeated wettings by
such liquids as water (except rain water), detergents or
sewage.
LOCATION OF MANUAL VALVE
ONLY WHERE REQUIRED
HEIGHT AS REQUIRED
BY LOCAL CODE
GROUND JOINT PIPE UNION
TO BE INSTALLED AHEAD OF
GAS VALVE
DRIP LEG
REDUCING COUPLING
1 / 2"
x 1/~" WITH Ye" PIPE
PLUG TO MEASURE
LINE GAS PRESSURE.
Fig. 6
CHECKING THE GAS PIPING
A
CAUTION
To avoid the possibility of property
damage, personal injury or fire, the fol-
lowing instructions must be performed
regarding gas connections, pressure
testing, location of shutoff valve and
installation of gas piping.
A
A
A
A
The unit and its gas connections must be leak tested
before placing in operation. Because of the danger of
explosion or fire, never use a match or open flame to
test for leaks. Never exceed specified pressures for
testing. Higher pressure may damage the gas valve
and cause overfiring which may result in heat
exchanger failure.
This unit and its individual shut-off valve must be dis-
connected from the gas supply piping system during
any pressure testing of that system at test pressures
in excess of psig (3.48 kPa).
This unit must be isolated from the gas supply system
by closing its individual manual shutoff valve during
any pressure testing of the gas supply piping system at
test pressures equal to or less than 'h psig (3.48 kPa).
The shut off valve should be located in a convenient
location (within (6) six feet of unit) between the meter
and the unit. Proper sizing of gas piping depends on
the cubic feet per hour of gas flow required, specific
gravity of the gas and the length of the run. Lay out
the piping plan and refer to the National Fuel Gas
code manual to obtain the correct pipe sizing for each
branch run, etc.
TANKS AND PIPING - PROPANE UNITS
All propane gas equipment must conform to the safety stand-
ards of the National Board of Fire Underwriters (See NBFU
Manual 58).
For satisfactory operation, propane gas pressure must be 10
inch W.C. at the furnace manifold with all gas appliances in
operation. Maintaining proper gas pressure depends on
three main factors:
1. Vaporization rate, which depends on (a) temperature of the
liquid, and (b) "wetted surface" area of the container or
containers.
2. Proper pressure regulation. (Two-stage regulation is rec-
ommended from the standpoint of both cost and
efficiency.)
3. Pressure drop in lines between regulators, and between
second stage regulator and the appliance. Pipe size
required will depend on length of pipe run and total load of
all appliances.
Complete information regarding tank sizing for vaporization,
recommended regulator settings, and pipe sizing is available
from most regulator manufacturers and propane gas
suppliers.
Propane is an excellent solvent, and special pipe dope must
be used when assembling piping for this gas as it will quickly
dissolve white lead or most standard commercial com-
pounds. Shellac base compounds resistant to the actions of
liquified petroleum gases such as Gasolac, Stalactic, Clyde's
or John Crane are satisfactory.
Please refer to Fig. 7 for typical propane gas installations.
Fig. 7— Typical Propane Piping
S ' O 'S POUNDS PRESSURE ..E RE
SEVER.1 POUNDS v.R,%r,ON WON'
NURf BU' DON' oo OVER ]0
POUNDS
PROPANE PIPING CHARTS
Sizing Between First and Second Stage Regulator
Maximum Propane Capacities listed are based on 2 PSIG Pressure Drop at 10 PSIG
Setting. Capacities in 1,000 BTU/HR
PIPE OR
TUBING
LENGTH
FEET
TUBING SIZE. O.D.. TYPE L 9001601.
5000051.0
1/2'
PIPE SIZE.
40
3/4• 3/8' l/2" 5/8
3/4'
7/8'
10
730 1.700 3.200 5.300
8.300 1.200 7.500
2 500
1.100
2.200 3.700
5.800
2.200
4.200
30
400
920
2.000
7.900
4.700
1.800
4 000
40 370 850 1.700 7.700 4.100 1.600 3 100
50
330
770 1.500
2.400
3.700 1.500 3.400
60
300 700 1.300
2.200 3.300 1 300 3.100
80
260 610 1.200 1.900
2.900 1.200 2.600
100 220 540 1.000 1700 2.600 1.000
2.300
125 200 490 900 1.400 2.300 900 2.100
150 190 430 630 1.30O 2.100 830 1.900
75 170 400 780 1.250 1.900 770 1.700
200 160 360 730 1.100 1.800 720 1.500
To Conver to Capacities at 15 PSIG Settings — Multiply by 1.130
To Convert to Capacities at 5 PSIG Settings — Multiply by 0.879
8