Part number 550-101-232/0703
5
GAS
-
FIRED
WATER
BOILER
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Installation Manual — Multiple-boiler Systems
For simplicity, the table on page 4 lists only systems using multiples of the same Ultra boiler module.
Any combination of Ultra boilers can be installed as a multiple boiler system.
Figure 1
Ratings and engineering data (continued)
Notes
1. Based on standard test procedures outlined by DOE for
individual boilers.
2. Net I=B=R ratings are based on piping and pickup allow-
ance of 1.15. Consult Technical Services for other allow-
ances.
3. Foundation sizes above provide 6 inches between boilers
and 2 inches from boiler to edge of foundation. Smaller
foundations are possible with reduced service clearances.
See Ultra Boiler Manual for details.
For side-to-side installations, see Figure 3, page 7.
For back-to-back installations, see Figure 4, page 7.
4. Operating weight is the total weight, including water.
5. Ultra-230 boilers can be vented with 3-inch vent instead
of 4-inch, with the limitations described in the Ultra Boiler
Vent Supplement. (Using the smaller vent pipe reduces
maximum allowable run.)
All Ultra installations require a separate vent pipe and
termination for each boiler. Vent piping cannot be
manifolded. Install and terminate vents as described in
the Ultra Boiler Vent Supplement.
Combustion air piping can be individually piped or
manifolded, as described on page 13. See Ultra Boiler Vent
Supplement for individual air piping.
6. Total amp requirements include boiler circulators.
Water header piping
Determine the flow rate that the system header and other
pipes will handle. Then use the table at right to determine
the minimum pipe size. This table shows pipe sizing both
for 350 and 500 milinches per foot head loss. Other pipe
sizing using recognized engineering would be acceptable.
Gas piping
See pages 14 and 15 for gas piping requirements and
connections.
