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Weil-McLain 94 Series 3 Water and steam boilers — for Gas, Light Oil, & Gas/Light Oil-Fired Burners
16 Part No. 550-110-275/1018
Connect steam boiler piping
Figure 18 Cold water fill piping
Figure 19 Condensate piping to boiler (see Figure 18
for cold water fill piping detail)
Boiler
model number
AHRI gross output
(lbs steam per hour)
Gallons condensate
per hour
Minimum condensate receiver capacity (gallons) (Note 1)
Recommended condensate
feed pump capacity
GPM at 15 PSI
15-minute boiler
operation
30-minute boiler
operation
45-minute boiler
operation
60-minute boiler
operation
894
2,028 244 74 148 222 296 8.0
994
2,320 279 84 168 252 336 9.0
1094
2,612 314 95 190 285 380 10.5
1194
2,904 349 105 210 315 420 12.0
1294
3,190 383 115 230 345 460 13.0
1394
3,480 418 126 252 378 504 14.0
1494
3,770 453 136 272 408 544 15.0
1594
4,070 489 147 294 441 588 16.5
1694
4,360 524 158 316 474 632 17.5
1794
4,650 559 168 336 504 672 19.0
1894
4,940 594 179 358 537 716 20.0
1994
5,230 628 189 378 567 756 21.0
2094
5,520 663 199 398 597 796 22 0
2194
5,810 698 210 420 630 840 22.0
2294
6,100 732 220 440 660 880 24.0
2394
6,390 767 231 462 693 924 26.0
2494
6.680 802 241 482 723 964 27.0
2594
6,970 837 252 504 756 1,008 28.0
Note 1 — Maximum time to when condensate returns to boiler — the longer the time for condensate to return, the larger the receiver must be.
Figure 20 Condensate receiver capacity requirements
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
(86
3
⁄4" 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 page 17 through page 18 for single
boilers. 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 15, page 15, for sizing.
d. Cold water fill piping — Connect cold water fill piping as shown
in Figure 18. 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 19 for piping and Figure 20 for sizing.
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