Connect Steam Boiler Piping - Weil-McLain 88 Manual

Weil-McLain 88 Water and steam boilers — Series 2 —

Connect steam boiler piping

General steam piping information:
1. Hartford loop piping arrangement and wet return are required for
steam boilers. Use the Hartford loop for both pumped-return and
gravity-return systems.
2. Maintain 24-inch minimum from waterline to bottom of header (63"
from bottom of section).
3. When using condensate receiver, feed pump must be energized by
boiler-mounted pump controller.
4. Install piping:
a. Install piping as shown on
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
equalizer pipe size.
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 make-up water.
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.
Condensate receiver capacity required
Boiler I=B=R gross output
model number (lbs steam per hour)
488 810
488R 794
1084
588
1358
688
1632
788
888 1904
988 2170
988R 1991
1088 2452
1088R 2304
1188 2724
1288 3000
1388 3270
1488 3550
3820
1588
4090
1688
3980
1688R
1788 4370
1888 4640
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
page 17 through page 18 for single boil-
Gallons condensate Minimum condensate receiver capacity (gallons) (Note 1)
per hour
15-minute boiler
operation
97 29
95 28
130 39
163 49
195 59
228 68
261 78
239 72
294 88
277 83
327 98
360 108
392 117
426 127
458 137
490 147
478 143
524 157
557 167
for Gas, Light Oil, & Gas/Light Oil-Fired Burners
Cold water fill piping
Condensate piping to boiler
30-minute boiler 45-minute boiler 60-minute boiler
operation operation
58 87
57 85
78 117
98 147
117 176
137 205
157 235
145 217
176 265
166 249
196 294
216 324
235 353
255 383
274 412
294 441
287 430
314 471
334 501
Recommended condensate
feed pump capacity
GPM at 15 PSI
operation
116 3.2
114 3.1
156 4.3
196 5.4
234 6.5
273 7.6
313 8.7
289 8.0
353 9.8
332 9.2
392 10.9
432 12.0
470 13.1
511 14.2
550 15.3
588 16.4
574 15.9
629 14.5
668 18.6
Part No. 550-100-068/1009