Now in its fourth edition, Electricity and Controls for HVAC/R equips readers with the information needed to work effectively with all types of motors and control devices found in the heating and air conditioning industry. Prior knowledge of electricity is not required as this book begins with discussion of essential basic electricity and electrical circuits concepts. Numerous schematic diagrams, plus step-by-step troubleshooting procedures, are included to acquaint readers with all of the different types of circuits commonly encountered in the HVAC-R field. With an eimphasis on electrical safety, plus an all-new troubleshooting unit, this edition of Electricity and Controls for HVAC/R also features expanded information on thermostats, short cycle timers, heat pressure controls for refrigeration, variable frequency drives, and more!This switch symbol indicates that the pressure switch is wired normally open, but pressure holds the contact closed. If the pressure decreases to a certain level, the switch will open and break connection to the rest of the circuit. SCHEMATICanbsp;...
|Title||:||Electricity and Controls for HVAC/R|
|Author||:||Stephen L. Herman, Bennie L. Sparkman|
|Publisher||:||Cengage Learning - 2000|