Table of Contents
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Operator interface 167
Optimum Start 138
Optimum Stop 138
Output Control 128
Output Devices 128
P
Parallel Fan ATU 404
Peer Communications Protocol 188
Phone Lines 188
PI 7
PI control 23
PID 7
PID control 25
Pilot Bleed System 62
Pilot-operated valve 431
Piping Arrangements
Hot Water 359
Piping Systems
Coupled Vs Decoupled 347
Direct Vs Reverse Return 346
Pitot tube sensors 277
Pneumatic
Centralization 89
Control Combinations
Changeover Control 87
Electric-Pneumatic Relay Control 87
Limit Control 85
Manual Switch Control 86
Pneumatic Recycling Control 88
Pneumatic-Electric Relay Control 88
Reset Control 87
Sequence Control 85
Control System 61, 90
Controller 72
Potentiometer 81
Recycling Control 88
Sensor 73
Switch 83
Pneumatic control 6
Pneumatic Control Fundamentals 37
Pneumatic-Electric Relay 82, 88
Positive (Direct) Reset 121
Positive displacement compressor 295
Positive-Positioning Relay 80
Power Supply
Electronic 129
Preheat control processes 228
Pressure Controller 71
Pressure Conversion Multipliers 466
Pressure drop 430
critical 430
Pressure Independent
Constant Volume ATU
Dual Duct 407
VAV ATU
Dual Duct 406
ENGINEERING MANUAL OF AUTOMATIC CONTROL
Pressure Reducing Stations
District Heating 383
Pressure Reducing Valve Station 68, 369
Pressure Reducing Valves 69
Pressure Sensor
Electronic 127
Pressure sensors 277
Pressure-Dependent ATU 399
Pressure-Independent ATU 399
Primary Network 381
Process 6
Processor
Management-Level 184
Operations-Level 184
Programming
Configuration 138
Custom Control 138
Data File 138
System Initialization 138
Sensing element 33
Properties of Saturated Steam Data 476
Proportional Band 6, 22, 60, 121
Proportional Control 6, 21, 121
Proportional-Integral 121
Proportional-integral (PI) control 7, 23
Proportional-Integral Controller 72
Proportional-integral-derivative (PID) control 7, 25
Propylene Glycol Solutions 438
Psi to kPa Conversion 466
Psychrometric Aspects
Air Conditioning Process 43
Air Washer 49
Cooling and Dehumidification 51
Air Washer 51
Cooling Process 44
Dehumidification and Reheat 52
Heating Process 43
Humidifying Process 44
Mixed Air 42
Steam Jet Humidifier 46
Vaporizing Humidifier 50
Psychrometric Chart Fundamentals 37
Psychrometric Charts 39
ASHRAE 53
Psychrometric Processes 40
Pulse Width Modulation 128
Pump
Affinity Laws 339
Efficiency 338
Performance 337
Performance Curves 338
Power Requirements 338
Pump Control
Variable Speed 353
Decoupled 358
Minimum Flow 357
Pump Speed Valve Position Load Reset 355
491
INDEX
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