Installation Instructions
CONNECTING THE WATER HEATER TO GAS AND WATER
1 GAS PIPING
GENERAL INSTRUCTIONS
•Make sure gas supply is off prior to making any connections to the water heater. A manual gas control valve, provided with this water heater, must be placed in the gas supply line to the water heater. A union can be used on the connection above the
•Check the type of gas and the gas inlet pressure before connecting the water heater. If the water heater is not of the gas type that the building is supplied with, DO NOT connect the water heater. Contact the dealer for the proper unit to match the gas type.
•Check the gas supply pressure immediately upstream at a location provided by the gas company. Supplied gas pressure must be within the limits shown in the Specifications section.
•Before placing the appliance in operation, all joints, including the heater, must be checked for gas tightness by means of leak detector solution, soap and water or an equivalent nonflammable solution, as applicable. (Since some leak test solutions, including soap and water, may cause corrosion or stress cracking, the piping shall
be rinsed with water after testing, unless it has been determined that the leak test solution is noncorrosive.)
•Always use approved connectors to connect the unit to the gas line. Always purge the gas line of any debris before connection to the water heater.
•The gas supply line shall be gas tight, sized and so installed as to provide a supply of gas sufficient to meet the maximum demand of the heater and all other
•Any compound used on the threaded joint of the gas piping shall be a type which resists the action of liquefied petroleum gas (propane/LPG).
•Refer to an approved pipe sizing chart if in doubt about the size of the gas line.
1 GAS PIPING (cont.)
PIPE SIZING PROCEDURE
The gas supply to the home must be capable of handling the entire gas load of the home, calculated by adding the BTU rating of each gas appliance in the home. State and local codes must be met, as well as utility requirements, to ensure gas supply to the unit is adequate to meet the rated demand. Use the charts below as a guide to size the pipe from the utility meter to the tankless water heater. Gas line sizing is based on gas type, the pressure drop in the system, the gas pressure supplied and the gas line type. Refer to the National Fuel Gas Code, NFPA 54, and/or your local gas provider, for proper gas line sizing.
PIPE SIZING TABLE – NATURAL GAS
cubic feet per hour | Schedule 40 Metallic Pipe | ||||||
Inlet Pressure: | less than 2 psi (55 inches W.C.) |
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Pressure Drop: | 0.3 inches W.C. |
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Specific Gravity: | 0.60 |
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| PIPE SIZE (INCHES) |
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Length | 3/4 |
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| 1 | 11/4 |
| 11/2 |
10 | 273 |
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| 514 | 1060 |
| 1580 |
20 | 188 |
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| 353 | 726 |
| 1090 |
30 | 151 |
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| 284 | 583 |
| 873 |
40 | 129 |
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| 243 | 499 |
| 747 |
50 | 114 |
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| 215 | 442 |
| 662 |
60 | 104 |
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| 195 | 400 |
| 600 |
70 | 95 |
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| 179 | 368 |
| 552 |
80 | 89 |
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| 167 | 343 |
| 514 |
90 | 83 |
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| 157 | 322 |
| 482 |
100 | 79 |
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| 148 | 304 |
| 455 |
125 | 70 |
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| 131 | 269 |
| 403 |
150 | 63 |
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| 119 | 244 |
| 366 |
175 | 58 |
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| 109 | 224 |
| 336 |
200 | 54 |
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| 102 | 209 |
| 313 |
PIPE SIZING TABLE – PROPANE GAS
cubic feet per hour | Schedule 40 Metallic Pipe | |||||
Inlet Pressure: | 11.0 inches W.C. |
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Pressure Drop: | 0.5 inches W.C. |
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Specific Gravity: | 1.50 |
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| PIPE SIZE (INCHES) |
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Length | 1/2 |
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| 3/4 | 1 | 11/4 |
10 | 291 |
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| 608 | 1150 | 2350 |
20 | 200 |
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| 418 | 787 | 1620 |
30 | 160 |
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| 336 | 632 | 1300 |
40 | 137 |
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| 287 | 541 | 1110 |
50 | 122 |
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| 255 | 480 | 985 |
60 | 110 |
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| 231 | 434 | 892 |
80 | 101 |
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| 212 | 400 | 821 |
100 | 94 |
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| 197 | 372 | 763 |
125 | 89 |
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| 185 | 349 | 716 |
150 | 84 |
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| 175 | 330 | 677 |
175 | 74 |
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| 155 | 292 | 600 |
200 | 67 |
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| 140 | 265 | 543 |
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