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Table 5. Capacity of Black Iron Gas Pipe
(cu. ft. per hour) for Natural Gas (specific gravity = .60)
LEAK CHECK
!
WARNING:
Fire or Explosion Hazard
Failure to follow the safety warnings exactly
could result in serious injury, death or property
damage.
Never test for gas leaks with an open flame. Use
a commercially available soap solution made
specifically for the detection of leaks to check all
connections. A fire or explosion may result
causing property damage, personal injury or
loss of life.
After the gas piping to the furnace is complete, all connections
must be tested for gas leaks. To check for leaks in gas
piping systems, use only a soap and water solution or other
approved method.
!
CAUTION:
Do not use matches, lighters, candles, or other
sources of open flame to check for gas leaks.
IMPORTANT NOTE:
When pressure testing the gas supply lines at pressures
greater than 1/2 psig (14 inch W.C.), the furnace must be
disconnected from the gas supply piping system to
prevent damage to the gas control valve. If the test
pressure is less than or equal to 1/2 psig (14 inch W.C.),
the furnace must be isolated from the gas supply line by
closing the manual shut-off valve.
Conversion
Conversion of this furnace to use LP/propane gas must
be made by qualified service personnel, using only
approved parts.
!
WARNING:
This furnace was equipped at the factory for use
with natural gas only. A special kit, supplied by
the manufacturer, is required to convert the
furnace to operate on LP/propane gas. Failure to
use the proper conversion kit can cause fire,
explosion, property damage, carbon monoxide
poisoning, personal injury, or death.
NOMINAL LENGTH OF PIPE RUN
BLACK IRON (feet)
PIPE DIAMETER
(in.) 1020304050607080
1/2 130 90 75 65 55 50 45 40
3/4 280 190 150 130 115 105 95 90
1 520 350 285 245 215 195 180 170
1 1/4 1050 730 590 500 440 400 370 350
1 1/2 1600 1100 890 760 670 610 560 530
The cubic feet per hour listed in the table above must be greater than the cubic fee
per hour of gas flow required by the furnace.
To determine the cubic feet per hour of gas flow required by the furnace, divide the
input rate of the furnace by the heating value of the gas:
Cubic Feet Per Hour Required = Input To Furnace (Btu/hr)
Heating Value of Gas (Btu/Cu. Ft.)
CAPACITY OF BLACK IRON GAS PIPE (CU. FT. PER HOUR)
FOR NATURAL GAS (SPECIFIC GRAVITY - 0.60)
High Altitude Application
High altitude application with this furnace can be field
performed by a simple adjustment of manifold pressure,
and if necessary changing the orifices. The changes
required depend on the installation altitude and the heating
value of the gas. The gas heating value based on sea level
can be obtained from your local gas utility. The heating
value of gas at high altitude is always lower than the sea
level heating value. The heating values used in Tables 6
& 7 are based on sea level values.
Natural Gas High Altitude Conversion
All factory shipped furnaces are ready to operate between
zero and 4999 ft. above sea level. For higher altitudes
(between 5000 and 10,000 ft. above sea level), conversion
can be achieved simply by adjusting the furnace manifold
pressure as shown in Table 6.
LP/Propane Gas Sea Level and High Altitude
Conversion
IMPORTANT NOTE: When converting a low NOx furnace
from natural gas to LP/Propane, it is necessary to remove
the NOx baffles from the furnace.
Conversion of this furnace to utilize LP/propane gas must
be made by qualified service personnel, using factory
authorized or approved parts. Conversion to LP/propane
gas can be accomplished by first replacing the natural gas
orifices with the appropriate LP/propane orifices shown in
Table 8 or 9. Note: for installations between zero and 5000
ft. above sea level, a #54 or #55 drill size orifice should be
used depending upon the rated firing rate of the unit (see
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