0 mechanical (cont’d), 1 gas piping and pressures (cont’d), Gas connection size – Reznor UDAS Unit Installation Manual User Manual
Page 12: Sizing gas supply line, 1 gas supply and connections (cont’d)
Page 12
Gas Connection Size
All piping must be in accordance with requirements outlined in the National Fuel Gas
Code ANSI/Z223.1a (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 hangers, 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 liquefied petroleum
gas or any other chemical constituents of the gas being supplied.
Install a ground joint union and manual shutoff valve upstream of the unit control sys-
tem, as shown in
FIGURE 9. Installation of a trap with a minimum 3” (76mm) drip leg
is required.
The unit is equipped with a nipple that extends outside the cabinet. The gas connection
is either 1/2” or 3/4”.
Leak-test all connections by brushing on a leak-detecting solution.
WARNING
All components of a gas supply system must be leak tested prior
to placing equipment in service. NEVER TEST FOR LEAKS WITH
AN OPEN FLAME. Failure to comply could result in personal
injury, property damage or death.
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.
Sizing
Gas
Supply
Line
6.0 Mechanical
(cont’d)
6.1 Gas Piping and Pressures (cont’d)
6.1.1 Gas Supply and Connections (cont’d)
Gas Connection (inches)
Size
Natural
Propane
30, 45, 60, 75, 100, 125, 150, 175, 200
1/2
1/2
225, 250, 300, 350, 400
3/4
3/4