WARNING: This appliance is equipped for a maximum
gas supply pressure of 1/2 psi, 3.5 kPa, or 14 inches wa
-
ter column. Supply pressure greater than 1/2 psi requires
installation of an additional lockup-type service regulator
external to the unit.
WARNING: PRESSURE TESTING SUPPLY PIPING
Test Pressures Above 1/2 PSI: Disconnect the heater and
manual valve from the gas supply line which is to be test
-
ed. Cap or plug the supply line.
Test Pressures Below 1/2 PSI: Before testing, close the
manual valve on the heater.
All piping must be in accordance with requirements outlined in the National
Fuel Gas Code ANSI Z223.1/NFPA 54 (latest edition) or CSA-B149.1 and
B149.2 (See Paragraph 2). Gas supply piping installation should conform
with good practice and with local codes. Support gas piping with pipe hang-
ers, metal strapping, or other suitable material; do not rely on the heater to
support the gas pipe.
The heater is orificed for operation with natural gas having a heating value
of 1000 (± 50) BTU per cubic ft or propane gas with a heating value of 2500
(± 100) BTU per cubic ft. If the gas at the installation does not meet these
specifications, consult the factory for proper orificing.
Pipe joint compounds (pipe dope) shall be resistant to the action of lique
-
fied petroleum gas or any other chemical constituents of the gas being
supplied.
7. Mechanical
Sizing Gas Supply Line
7.1 Gas Piping and Pressure
7.1.1 Gas Supply
Capacity of Piping
Cubic Feet per Hour based on 0.3" w.c. Pressure Drop
Specific Gravity for Natural Gas -- 0.6 (Natural Gas -- 1000 BTU/Cubic Ft)
Specific Gravity for Propane Gas -- 1.6 (Propane Gas -- 2550 BTU/Cubic Ft)
Length
Diameter of Pipe
of
1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
Pipe
Natural
Propane
Natural
Propane
Natural
Propane
Natural
Propane
Natural
Propane
Natural
Propane
20'
92
56
190
116
350
214
730
445
1100
671
2100
1281
30'
73
45
152
93
285
174
590
360
890
543
1650
1007
40'
63
38
130
79
245
149
500
305
760
464
1450
885
50'
56
34
115
70
215
131
440
268
670
409
1270
775
60'
50
31
105
64
195
119
400
244
610
372
1105
674
70'
46
28
96
59
180
110
370
226
560
342
1050
641
80'
43
26
90
55
170
104
350
214
530
323
990
604
90'
40
24
84
51
160
98
320
195
490
299
930
567
100'
38
23
79
48
150
92
305
186
460
281
870
531
125'
34
21
72
44
130
79
275
168
410
250
780
476
150'
31
19
64
39
120
73
250
153
380
232
710
433
175'
28
17
59
36
110
67
225
137
350
214
650
397
200'
26
16
55
34
100
61
210
128
320
195
610
372
Note: When sizing supply lines, consider possibilities of future expansion and increased requirements.
Refer to National Fuel Gas Code for additional information on line sizing.
Form I-UEAS, P/N 221232 R6, Page 9
