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6
Gas connections
Table 6B Natural Gas Pipe Size Chart
Capacity of Schedule 40 Metallic Pipe in Cubic Feet of Natural Gas Per Hour
Pipe
Size
10
20
(Inches)
1/2
131
90
3/4
273
188
1
514
353
1 1/4
1,060
726
1 1/2
1,580
1,090
2
3,050
2,090
2 1/2
4,860
3,340
3
8,580
5,900
4
17,500 12,000
Check inlet gas supply
DO NOT adjust or attempt to measure gas
WARNING
valve outlet pressure.
or measure the gas valve outlet pressure
could result in damage to the valve, causing
potential severe personal injury, death, or
substantial property damage.
The gas piping must be sized for the proper flow and length of
pipe, to avoid excessive pressure drop. Both the gas meter and
the gas regulator must be properly sized for the total gas load.
If you experience a pressure drop greater than 1 inch w.c.
(249 Pa), the meter, regulator, or gas line is undersized or in
need of service. Perform the steps below when checking inlet
gas supply:
1.
Turn the main power switch to the "OFF" position.
2.
Shut off gas supply at the manual gas valve in the gas
piping to the appliance.
3.
Remove the 1/8" pipe plug on the flange to the factory
supplied gas shutoff valve and install a suitable 1/8"
fitting (field supplied) for the manometer tubing. Place the
tubing of the manometer over the tap once the 1/8"
fitting is installed as shown in FIG. 6-4.
(continued)
TABLE - 6B
(based on .60 specific gravity, 0.30" w.c. pressure drop)
Length of Pipe in Straight Feet
30
40
50
60
72
62
55
N/A
151
129
114
104
284
243
215
195
583
499
442
400
873
747
662
600
1,680
1,440
1,280
1,160
2,680
2,290
2,030
1,840
4,740
4,050
3,590
3,260
9,660
8,270
7,330
6,640
Attempting to alter
Installation & Operation Manual
70
80
90
100
N/A
N/A
N/A
N/A
95
89
83
79
179
167
157
148
368
343
322
304
552
514
482
455
1,060
989
928
877
1,690
1,580
1,480
1,400
3,000
2,790
2,610
2,470
6,110
5,680
5,330
5,040
4.
Slowly turn on the gas supply at the factory installed
manual gas valve.
5.
Turn the power switch to the "ON" position.
6.
Adjust the temperature set point on the control panel of
the SMART TOUCH control module to call for heat or
utilize Service Mode, see page 44 of this manual.
7.
Observe the gas supply pressure as the burner fires at
100% of rated input. Percent of burner input will be
displayed on the Modulation Screen.
8.
Ensure inlet pressure is within specified range.
Minimum and maximum gas supply pressures are
specified in this section of the manual.
9.
If gas supply pressure is within normal range and no
adjustments are needed, proceed on to Step 11.
10. If the gas pressure is out of range, contact the gas utility,
gas supplier, qualified installer or service agency to
determine the necessary steps to provide proper gas
pressure to the control.
11. Turn the power switch to the "OFF" position.
12. Shut off the gas supply at the manual gas valve in the gas
piping to the appliance.
13. Remove the manometer from the pressure tap on top of
the gas valve. Remove the 1/8" (3 mm) field supplied
fitting and reinstall the pipe plug removed in Step 3.
125
150
175
200
N/A
N/A
N/A
N/A
70
63
58
N/A
131
119
109
102
269
244
224
209
403
366
336
313
777
704
648
602
1,240
1,120
1,030
960
2,190
1,980
1,820
1,700
4,460
4,050
3,720
3,460
33
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