One of the most important parts of the single-phase electric motor is the start mechanism. A special type is needed for use with single-phase motors.…
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The field of a single-phase motor, instead of rotating, merely pulsates. No rotation of the rotor takes place. A single-phase pulsating field may be visualized…
As previously mentioned, this type of motor is used as a fan motor in refrigerators and freezers and in some types of air-conditioning equipment where…
Most AC motors are of the induction type. They are, in general, simpler and cheaper to build than equivalent DC machines. They have no commutator,…
The use of low-voltage control systems is becoming more widespread as the demand for residential air conditioning increases. This necessitates the use of a transformer…
Several piping arrangements are used for hotgas defrost systems, one of which is shown in Fig. 6-25. A portion of the compressor discharge gas is…
There are several applications, particularly on suction lines, where pressure drops in the range of 2 to 4 lb/in.2 (psi) cannot be tolerated. Therefore, only…
The primary purpose of a solenoid valve in a refrigerant liquid line is to prevent flow into the evaporator during the off cycle. On multiple…
Solenoid valve operation is based on the theory of the electromagnets. The solenoid valve coil sets up a magnetic field when electrical current is flowing…
The primary purpose of an electrically operated solenoid valve is to control automatically the flow of fluids, liquid or gas. There are two basic types…