Water is used to cool condensers. One method is to cool condensers with water from the city water supply and then exhaust the water into…
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Figure 8-1 illustrates the refrigeration process within an air-cooled condenser. Figure 8-2 shows some of the various types of compressors and condensers mounted as a…
Motors will run at the voltage variations already mentioned. This does not imply such operation will comply with industry standards of capacity, temperature rise, or…
This relay is generally used with large commercial and air-conditioning compressors (see Fig. 7-31). Motors may be capacitor-start, capacitor-run types up to 5 hp. Relay…
The current-type relay is most often used with small refrigeration compressors up to 1 hp. Where power is applied to the compressor motor, the relay…
A hermetic compressor motor relay is an automatic switching device designed to disconnect the motor start winding after the motor has come up to running…
The permanent split-capacitor (PSC) motor is used in compressors for air-conditioning and refrigeration units. It has an advantage over the capacitor-start motor inasmuch as it…
An induction motor will not always reverse while running. It may continue to run in the same direction, but at a reduced efficiency. An inertia-type…
The capacitor motor is slightly different from a split-phase motor. A capacitor is placed in the path of the electrical current in the start winding…
The repulsion-induction motor starts on one principle of operation and, when almost up to speed, changes over to another type of operation. Very high twisting…