Weil-McLain Boiler Water header piping, Gas piping, Ratings and engineering data continued

GAS-FIRED WATER BOILER — Installation Manual — Multiple-boiler Systems

Figure 1 Ratings and engineering data (continued)

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.

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.

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.

Part number 550-101-232/0703 5