However, where a 100% operating range is desired, high-limit controls are equipped with dual potentiometers. The external wiring diagram for a Series 90 high-limit controller and a motorized valve is shown in Figure 8-47. This type of circuitanbsp;...
|Title||:||Control Systems for Air Conditioning and Refrigeration|
|Author||:||Billy C. Langley|
|Publisher||:||Prentice Hall - 1985-01-01|