TM
Installation & Service 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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Iron Pipe |
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| Length of Pipe in Straight Feet for 1/2 PSI |
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Size (Inches) |
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| 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 125 | 150 | 175 | 200 |
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 |
3/4 | 369 | 256 | 205 | 174 | 155 | 141 | 128 | 121 | 113 | 106 | 95 | 86 | 79 | 74 |
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1 | 697 | 477 | 384 | 328 | 292 | 267 | 246 | 236 | 210 | 200 | 179 | 164 | 149 | 138 |
1400 | 974 | 789 | 677 | 595 | 543 | 502 | 472 | 441 | 410 | 369 | 333 | 308 | 287 | |
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2150 | 1500 | 1210 | 1020 | 923 | 830 | 769 | 707 | 666 | 636 | 564 | 513 | 472 | 441 | |
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2 | 4100 | 2820 | 2260 | 1950 | 1720 | 1560 | 1440 | 1330 | 1250 | 1180 | 1100 | 974 | 871 | 820 |
6460 | 4460 | 3610 | 3100 | 2720 | 2460 | 2310 | 2100 | 2000 | 1900 | 1700 | 1540 | 1400 | 1300 | |
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3 | 11200 | 7900 | 6400 | 5400 | 4870 | 4410 | 4000 | 3800 | 3540 | 3330 | 3000 | 2720 | 2500 | 2340 |
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4 | 23500 | 16100 | 13100 | 11100 | 10000 | 9000 | 8300 | 7690 | 7380 | 6870 | 6150 | 5640 | 5130 | 4720 |
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WARNING
Shield water heaters are typically shipped ready to fire on natural gas. Check the water heater rating plate to determine which fuel the water heater is set for. In order to operate on LP gas contact the factory, an orifice MUST BE installed or a gas valve adjustment MUST BE made. Failure to comply could result in severe personal injury, death, or substantial property damage.
Check inlet gas supply
5. Reconnect power to the appliance. |
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 water heater to fire at full rate. Consult with local codes for proper installation or service procedures.
6. | Adjust the temperature set point on the control panel of |
| the electronic control module to call for heat. |
7. | Observe the gas supply pressure as the burner fires at |
| 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. |
WARNING
DO NOT adjust or attempt to measure gas valve outlet pressure. The gas valve is
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. | Disconnect power from the appliance. |
12. | Shut off the gas to the appliance. |
13. | Remove the manometer from the pressure tap on top of |
| the gas valve. |
The gas piping must be sized for the proper flow and length of pipe, to avoid excessive pressure drop. Both the gas meter and
tap. |
the gas regulator must be properly sized for the total gas load.
If you experience a pressure drop greater than 1 inch w.c., the meter, regulator, or gas line is undersized or in need of service. Perform the steps below when checking inlet gas supply:
1. | Disconnect power from the appliance. |
2. | Shut off gas to the appliance. |
WARNING
When
Do not check for gas leaks with an open flame
3. | Loosen the set screw one (1) full turn from inside the |
| pressure tap on top of the gas valve. Place the tubing of |
| the manometer over the tap once the set screw is |
| loosened as shown in FIG.’s |
4. | Slowly turn on the gas supply at the field installed |
| manual gas valve. |
14.Reconnect gas to the appliance.
15.Reconnect power to the appliance.
16.Adjust the temperature set point on the control panel of the electronic control module to the desired water temperature so the appliance will call for heat.
37