CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONS
............................................................................................................ 327
Introduction .......................................................................................... 327
Boiler Types ......................................................................................... 327
Modular Boilers ............................................................................... 327
Electric Boilers ................................................................................ 328
Flue Gas Analysis ........................................................................... 329
Oil Burners ...................................................................................... 329
Gas Burners .................................................................................... 329
Boiler Controls ..................................................................................... 330
Combustion Control ........................................................................ 330
General ........................................................................................... 332
Modular Boilers ............................................................................... 335
Introduction .......................................................................................... 335
Pump Performance ......................................................................... 337
Pump Efficiency .......................................................................... 338
Pump Affinity Laws ..................................................................... 339
System Curves ........................................................................... 340
Multiple Pumps ............................................................................... 343
Operation .................................................................................... 344
Dual Pump Curves ..................................................................... 345
292
ENGINEERING MANUAL OF AUTOMATIC CONTROL