Honeywell AUTOMATIC CONTROL Engineering Manual page 304

CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONS
Boiler System Contr
Hot And Chilled Water Distr i bution Systems Contr
ENGINEERING MANUAL OF AUTOMATIC CONTROL
Cooling Tower And Condenser Water Control ..................................... 318
Cooling Tower Performance Characteristics ................................... 318
Cooling Tower Capacity Control ...................................................... 318
On-Off Cooling Tower Fan Control ............................................. 319
Two-Speed Cooling Tower Fan Control ...................................... 319
Variable Speed Cooling Tower Fan Control ................................ 320
Single Cooling Tower Variable Speed Fan Control ................ 320
Dual Cooling Tower Variable Speed Fan Control ................... 322
Chiller Heat Recovery System ............................................................ 325
Free Cooling-Tower Cooling ........................................................... 325
Tower Free Cooling, Dual Chillers .................................................. 327
ol ............................................................................................................ 329
Introduction .......................................................................................... 329
Boiler Types ......................................................................................... 329
Cast Iron and Steel Boilers ............................................................. 329
Modular Boilers ............................................................................... 329
Electric Boilers ................................................................................ 330
Boiler Ratings And Efficiency .............................................................. 330
Combustion In Boilers ......................................................................... 331
Principles Of Combustion ............................................................... 331
Flue Gas Analysis ........................................................................... 331
Oil Burners ...................................................................................... 331
Gas Burners .................................................................................... 331
Boiler Controls ..................................................................................... 332
Boiler Output Control ...................................................................... 332
Combustion Control ........................................................................ 332
Flame Safeguard Control ................................................................ 332
Flame Safeguard Instrumentation ................................................... 333
Application Of Boiler Controls ......................................................... 333
Multiple Boiler Systems ....................................................................... 334
General ........................................................................................... 334
Dual Boiler Plant Control ................................................................. 335
Modular Boilers ............................................................................... 337
ol ..................................................................................... 337
Introduction .......................................................................................... 337
Classification Of Water Distribution Systems .................................. 337
Typical Water Distribution System .................................................. 337
Control Requirements For Water Distribution Systems .................. 338
Centrifugal Pumps Used In Hot And Chilled Water Systems .............. 338
Pump Performance ......................................................................... 339
Pump Power Requirements ........................................................ 340
Pump Performance Curves ........................................................ 340
Pump Efficiency .......................................................................... 340
Pump Affinity Laws ..................................................................... 341
Matching Pumps To Water Distribution Systems ............................ 342
System Curves ........................................................................... 342
Plotting A System Curve ............................................................. 342
Combining System And Pump Curves ....................................... 342
Variable Speed Pumps ................................................................... 344
Pumps Applied To Open Systems ................................................... 345
Multiple Pumps ............................................................................... 345
Operation .................................................................................... 346
Dual Pump Curves ...................................................................... 347
Distribution System Fundamentals ...................................................... 347
Direct Vs Reverse Return Piping Systems ..................................... 348
Coupled Vs Decoupled Piping Systems ......................................... 349
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