Instruction manual

Part number 550-142-056/0411
GWC gas-fired water boiler — Boiler Manual
100
Dimensions and ratings (continued)
Figure 106 Multiple GWC boilers — ratings and engineering data — maintain the clearances shown on pages 6 and 7 —
see Figure 28, page 23 and Figure 29, page 23 for layout options
Boilers in system
Model GWC
Total
CSA
input
DOE Heating
capacity
Boiler
H.P.
Net water
ratings
Manifolded
combustion air
duct size
Input,
MBH
Output,
MBH
- MBH
Square
inches
070 105 140 175
- Note 1 - Note 2
Note 3
Figure 37, page 31
2 140 130 3.9 112 70
2 210 194 5.8 168 105
2 280 260 7.8 226 140
2 350 322 9.6 280 175
3 210 195 5.8 168 105
3 315 291 8.7 252 158
3 420 390 11.7 339 210
3 525 483 14.4 420 263
4 280 260 7.8 224 140
4 420 388 11.6 336 210
4 560 520 15.5 452 280
4 700 644 19.2 560 350
5 350 325 9.7 280 175
5 525 485 14.5 420 263
5 700 650 19.4 565 350
5 875 805 24 700 438
6 420 390 11.7 336 210
6 630 582 17.4 504 315
6 840 780 23.3 678 420
6 1050 966 28.9 840 525
7 490 455 13.6 392 245
7 735 679 20.3 588 368
7 980 910 27.2 791 490
7 1225 1127 33.7 980 613
8 560 520 15.5 448 280
8 840 776 23.2 672 420
8 1120 1040 31.1 904 560
8 1400 1288 38.5 1120 700
Note 1
Based on standard test procedures outlined by DOE for individual boilers.
Note 2
Net I=B=R ratings are based on piping and pickup allowance of 1.15.
Consult Williamson-Thermoflo for other allowances.
Note 3
All GWC installations require a separate vent pipe and termination for each boiler. Vent piping cannot be manifolded. Install and
terminate vents as described in vent/air installation instructions in this manual.
Combustion air piping can be individually piped or manifolded. See Figure 37, page 31, for manifolded air piping.