Engineering Manual o.. - HVAC.Amickracing

GENERAL ENGINEERING DATACooling TowerCapacity Control 293Control 293Fan ControlOn-Off 294Two-Speed 294Variable Speed 295Free Cooling 300Dual Chillers 302Performance Characteristics 293Corrective action 8Critical pressure drop 404Custom Control Programming 135Cycle 8Cycling 8Cycling rate 8DDamperActuator and LinkageActuator Selection 431Jackshaft 431Multiple actuators 430Positive positioner 430Application EnvironmentCorrosion 429Nuclear/Seismic 429Static Pressure 429Temperature 429Turbulence 429Velocity 428ApplicationsFace and bypass Control 438Mixed Air Control 437Throttling Control 438Baffle 425Construction 426Mounting alternatives 430Normally open/normally closed 429Performance dataLeakage rating 426Pressure rating 428Temperature rating 428Torque requirement 428UL Classification (fire/Smoke) 428Velocity rating 428Pressure drop 436SizingDamper Characteristics 432, 435Determining Size 433Other considerations 435System Characteristics 431TypesFire 424Low Leakage 422Multiple section 425Parallel and opposed Blade 422Round 422Smoke 424Damper Control 101Dampers 74Data File Programming 135Data Penetration 182DDC 9Deadband 8, 272Degree Days 439Dehumidification 15Dehumidification and Reheat 53Dehumidification control processes 226DehumidifierAir Washer 52Density 39Density Conversion Multipliers 448Desiccant Drying 65Design considerations 147Design proceduresIndoor air quality 150Ventilation rate 150Deviation 9, 114Dew Point Temperature 39Differential 57Differential Pressure Sensor Location 334Digital 9Digital control 9Digital Unit Ventilator Control 391Digital-to-Analog (D/A) Converter 125Direct Acting 57, 114Direct Digital Control 125, 126Direct Digital Control Software 129Direct Heat Transfer Substations 361Discharge Air 57Distributed Power Demand 134Distribution SystemAHU Valve High Differential Pressure Control 329Flow And Pressure Control Solutions 325Fundamentals 322SteamSupply And Return Main Pressures 350Valve Selection 325Water 312Distribution SystemsChilled Water 341Classification Of Water 312Control 312Hot Water 335Low Pressure Steam 347Methods Of Controlling 325Steam 345Condensate Return 347Control 343Variable Vacuum Return 348WaterControl Requirements 313ENGINEERING MANUAL OF AUTOMATIC CONTROL 464