It should be noted that the motor does not use less energy when connected to 240 volts than it does when connected to 120 volts.…
Single-phase motors can also be constructed to operate on two separate voltages. These motors are designed to be connected to 120 or 240 volts. A…
The stator winding of a single-phase motor is generally tested with an ohmmeter. The ohmmeter test can be used to determine if a winding is…
Capacitor-start induction-run motors are very similar to resistance-start induction-run motors. The design of the stator winding is basically the same. The main difference is that…
The diffuser or grille minimum pressure for a given air volume reflects itself in ultimate system fan horsepower requirements. A diffuser or grille with a…
Throw and occupied area air location are closely related. Both could be considered in the analysis of specific area requirements. The minimum maximum throw for…
The air volume per diffuser or grille is that which is necessary for the cooling, heating, or ventilation requirements of the area served by the…
Bottom or side outlet openings in horizontal or vertical supply ducts should be equipped with adjustable flow-equalizing devices. Figure 17-6 indicates the pronounced one-sided flow…
After the heat loss or heat gain has been calculated, the sum of these losses or gains will determine the size of the duct systems…
Temperature controls for refrigerating service are designed to maintain adequate head pressure with evaporative condensers and cooling towers. Low refrigerant head pressure, caused by abnormally…