With the growing complexity of refrigeration and ventilation systems today, the technician / mechanic should be able to read and interpret all types of electrical diagrams. Electrical diagrams contain valuable information about electrical installation and operation of electrical equipment. The mechanic who installed an electrical equipment eg HVAC equipment is highly dependent on the wiring diagram that is issued by the manufacturer so that he can install the equipment properly.
The technician uses an electric diagram as a reference or referral to triangulate disorders electrical system of an electric equipment unit. There are three types of charts commonly used in industry, namely the schematic diagram, ladder diagram and wiring diagram or connection diagram. In the world of refrigeration and ventilation, electrical diagrams are often used also varies depending on the manufacturer maker.
Symbols Electrical Components
One thing that is not possible to construct an electric diagram is, contains all components used in a refrigeration unit and HVAC equipment in the electrical diagram, because it would be too takes place and become too complicated if accompanied by way of connection between components. Hence, why the electrical diagram using symbols to represent the electrical components used in a unit of refrigeration and ventilation equipment.
Electrical components used in refrigeration and ventilation systems can be divided into two parts, namely (1) the electrical load, (2) sensor, which consists of the control devices, and safety devices or protection. Load electricity used in refrigeration and ventilation equipment can be divided into two, namely the electrical load is used as a driver and the electrical load is used for other purposes. Electrical load that is used as a driver is divided into two, namely that produces rotary movement and which produces translational movement.
Electrical load that produces rotary movement commonly referred to as a motor. When the driving force of electrical energy called electric motor. Electrical load that produces translational movement is a solenoid coil. And the electric load for other purposes is the heating element (heater) and a lamp. The technician / mechanic should be able to identify most of the symbols used and know where seeing his position in an electrical equipment.
Most manufacturers use the same symbols in the diagrams of electrical uses, although so often found still few differences are minor. So a basic understanding of the basic symbols of electricity is the most important thing when you want to be successful in the industry. We begin our study with a discussion of various types of electrical loads are used in refrigeration and air world and basic symbols used by each component. Next will be discussed also various automatic control devices and safety devices.
Refrigeration and ventilation unit uses an electric motor to operate the compressor, condenser fan, evaporator fan, and defrost timer. Refrigeration units using different types of relays and contactors to build systems kontrol.Unit refrigeration and air using a heating element (heater) for the purpose of melting frost on evaporator, and use lights for illumination and as a sign. Which fall into the category of sensors is a wide range of automatic switches such as room thermostat, pressure switch, relay overload (overload protector), defrost terminator thermostat, etc.