Installation & Operation Manual
7Gas connections (continued)
Table 7A Natural Gas Pipe Size Chart
Nominal |
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| Natural Gas Pipe Capacity Chart |
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| Maximum | ||||||
Iron Pipe |
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| Capacity of Pipe | |||||||
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| Length of Pipe in Straight Feet |
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Size |
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| in Thousands of | |||||||
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| Btu/hr per hour | ||
(inches) | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 125 | 150 | 175 | 200 | ||
for gas pressures | ||||||||||||||||
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1/2 | 175 | 120 | 97 | 82 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | of 14 Inches | |
Water Column | ||||||||||||||||
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3/4 | 369 | 256 | 205 | 174 | 155 | 141 | 128 | 121 | 113 | 106 | 95 | 86 | 79 | 74 | ||
(0.5 PSIG) or less | ||||||||||||||||
1 | 697 | 477 | 384 | 328 | 292 | 267 | 246 | 236 | 210 | 200 | 179 | 164 | 149 | 138 | and a pressure | |
1400 | 974 | 789 | 677 | 595 | 543 | 502 | 472 | 441 | 410 | 369 | 333 | 308 | 287 | drop of 0.5 Inch | ||
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| Water Column | |
2150 | 1500 | 1210 | 1020 | 923 | 830 | 769 | 707 | 666 | 636 | 564 | 513 | 472 | 441 | |||
(Based on NAT | ||||||||||||||||
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2 | 4100 | 2820 | 2260 | 1950 | 1720 | 1560 | 1440 | 1330 | 1250 | 1180 | 1100 | 974 | 871 | 820 | ||
GAS, 1025 Btu/hr | ||||||||||||||||
6460 | 4460 | 3610 | 3100 | 2720 | 2460 | 2310 | 2100 | 2000 | 1900 | 1700 | 1540 | 1400 | 1300 | per Cubic Foot of | ||
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| Gas and 0.60 | |
3 | 11200 | 7900 | 6400 | 5400 | 4870 | 4410 | 4000 | 3800 | 3540 | 3330 | 3000 | 2720 | 2500 | 2340 | ||
Specific Gravity) | ||||||||||||||||
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4 | 23500 | 16100 | 13100 | 11100 | 10000 | 9000 | 8300 | 7690 | 7380 | 6870 | 6150 | 5640 | 5130 | 4720 | ||
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Check inlet gas supply
NOTICE
CSA or UL listed flexible gas connections are acceptable, but you must exercise caution to ensure that the line has adequate capacity to allow your boiler to fire at full rate. Consult with local codes for proper installation or service procedures.
4. | Slowly turn on the gas supply at the field 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 SYSTEM control module to call for heat. |
7. | Observe the gas supply pressure as the burner fires at |
WARNING DO NOT adjust or attempt to measure gas valve outlet pressure. Attempting to alter
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.On Models 399 - 500 loosen the set screw one (1) full turn from inside the pressure tap on top of the gas valve. On Models 600 - 800 remove the 1/8" (3 mm) pipe plug on the inlet flange to the valve and install a suitable 1/8" (3 mm) fitting (field supplied) for the manometer tubing. Place the tubing of the manometer over the tap once the set screw is loosened or the 1/8" (3 mm) fitting is installed (depending on model) as shown in FIG.’s
| 100% of rated input. Percent of burner input will be |
| displayed on the control panel. |
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. On Models 399 - 500 |
| screw inside the pressure tap. On Models 600 - 800 |
| remove the 1/8" (3 mm) field supplied fitting and |
| reinstall the pipe plug removed in Step 3. |
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