Connect steam boiler piping
General steam piping information:
Figure 20 Cold water fill piping
1.Hartford loop piping arrangement and wet return are required for steam boilers. Use the Hartford loop for both
2.Maintain
3.When using condensate receiver, feed pump must be energized by
4.Install piping:
a.Install piping as shown on page 17 through page 18 for single boil- ers. See page 19 for additional requirements when piping multiple boilers.
b.Return pipe sizing.
• Pumped return — Size return piping by pump.
• Gravity return — Size gravity return same as Hartford loop | Figure 21 Condensate piping to boiler |
equalizer pipe size. |
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c.Drain valve — Install system drain valve in lowest part of return piping close to boiler. See Figure 17, page 15, for sizing.
d.Cold water fill piping — Connect cold water fill piping as shown in Figure 20. Also shown are recommended valves and water meter, if used. Water meter will detect added makeup water, indicating leaks in system.
e.Condensate return piping:
•Satisfactory operation of any steam heating system depends on adequate return of condensate to maintain steady water level.
•Avoid adding excessive amounts of raw
•Where condensate return is not adequate, a low water cutoff with pump control, condensate receiver, and condensate boiler feed pump should be installed.
•See Figure 21 for piping and Figure 22 for sizing.
Figure 22 Condensate receiver capacity required
Boiler | I=B=R gross output | Gallons condensate | Minimum condensate receiver capacity (gallons) (Note 1) | Recommended condensate | ||||
model number | (lbs steam per hour) | per hour |
|
|
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| feed pump capacity | |
|
|
| GPM at 15 PSI | |||||
|
|
| operation | operation | operation | operation |
| |
488 | 810 | 97 | 29 | 58 | 87 | 116 | 3.2 | |
488R | 794 | 95 | 28 | 57 | 85 | 114 | 3.1 | |
588 | 1084 | 130 | 39 | 78 | 117 | 156 | 4.3 | |
688 | 1358 | 163 | 49 | 98 | 147 | 196 | 5.4 | |
788 | 1632 | 195 | 59 | 117 | 176 | 234 | 6.5 | |
888 | 1904 | 228 | 68 | 137 | 205 | 273 | 7.6 | |
988 | 2170 | 261 | 78 | 157 | 235 | 313 | 8.7 | |
988R | 1991 | 239 | 72 | 145 | 217 | 289 | 8.0 | |
1088 | 2452 | 294 | 88 | 176 | 265 | 353 | 9.8 | |
1088R | 2304 | 277 | 83 | 166 | 249 | 332 | 9.2 | |
1188 | 2724 | 327 | 98 | 196 | 294 | 392 | 10.9 | |
1288 | 3000 | 360 | 108 | 216 | 324 | 432 | 12.0 | |
1388 | 3270 | 392 | 117 | 235 | 353 | 470 | 13.1 | |
1488 | 3550 | 426 | 127 | 255 | 383 | 511 | 14.2 | |
1588 | 3820 | 458 | 137 | 274 | 412 | 550 | 15.3 | |
1688 | 4090 | 490 | 147 | 294 | 441 | 588 | 16.4 | |
1688R | 3980 | 478 | 143 | 287 | 430 | 574 | 15.9 | |
1788 | 4370 | 524 | 157 | 314 | 471 | 629 | 14.5 | |
1888 | 4640 | 557 | 167 | 334 | 501 | 668 | 18.6 |
Note 1 — Maximum time to when condensate returns to boiler — the longer the time for condensate to return, the larger the receiver must be.
16 | Part No. |