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Proper Piping Practice
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 NFPA 54/ANSI Z223.1.
IMPORTANT NOTE:
This unit is factory set to operate on
natural gas
at the altitudes shown on the rating plate. The plate
is stamped with the model number, type of gas and gas input rating. Make sure the unit is equipped to operate on the
type of gas available.
DO NOT VARY FROM THE MINIMUM SUPPLY PRESSURE GIVEN IN TABLE 1.
Doing so could create ignition problems.
DO NOT EXCEED THE RATED INPUT SHOWN ON THE RATING PLATE.
Overfiring of the unit could result in premature heat exchanger failure.
DO NOT UNDERSIZE THE NATURAL/PROPANE GAS PIPING FROM THE METER/TANK TO THE UNIT.
Doing so could cause unsatisfactory operation or equipment damage due to under firing of equipment.
When sizing a trunk line (Table 2), include all appliances on that line that could be operated simultaneously.
Gas Supply and Piping
Inlet Gas Pressure
Natural
Min. 5.0" W.C., Max. 10.0" W.C.
Propane
Min. 11.0" W.C., Max. 13.0" W.C.
Inlet Gas Pressure Must Not Exceed the Maximum Value Shown in
Table Above.
Table 1
Length of
Pipe in Feet
1/2
3/4
1
1 1/4
1 1/2
10
132
278
520
1050
1600
20
92
190
350
730
1100
30
73
152
285
590
980
40
63
130
245
500
760
50
56
115
215
440
670
60
50
105
195
400
610
70
46
96
180
370
560
80
43
90
170
350
530
90
40
84
160
320
490
100
38
79
150
305
460
Pressure = .50 PSIG or less and Pressure Drop of 0.3" W.C. (Based
on 0.60 Specific Gravity Gas)
Natural Gas Capacity of Pipe
in Cubic Feet of Gas Per Hour (CFH)
Nominal Black Pipe Size (inches)
BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
CFH =
Table 2
WARNING
To prevent death, personal injury or property damage when either using propane gas alone or at higher altitudes,
obtain and install the proper conversion kit(s). Failure to do so can result in unsatisfactory operation and/or
equipment damage. High altitude kits are for U.S. installations only and are not approved for use in Canada.
