HVAC Wiring Diagram
If your profession is with HVAC equipment installation or operation, then you must keep near hand the HVAC wiring diagram manual, HVAC wiring diagrams troubleshooting manual, HVAC wiring diagram symbols, HVAC wiring diagram colors, HVAC wiring schematic diagrams, air conditioner thermostat wiring diagram, HVAC condenser wiring diagram, how to wire air conditioner to furnace and heat pump wiring diagram etc.
HVAC Basic Wiring Ethics
A heating, ventilating and air-conditioning (HVAC) system is a simple system of heating and cooling exchangers using water or refrigerant (direct expansion system) as the medium. Pumps move the heated or cooled water to the exchangers. Fans then move the warmed or cooled air created at the exchangers to the occupied building interiors. So there are two stages to heating and cooling1. Water stage: water is the most efficient and inexpensive medium that we can cool directly (through a chiller) or heat (through a boiler)
2. Air stage: air is the medium for heat exchange in the building as it can be cooled or heated through coils.
Big energy users in HVAC
1. Fans: for air circulation and ventilation;2. Cooling: accomplished via chillers for the production of chilled water for large buildings or for the use of direct expansion cooling systems such as packaged air conditioners for small buildings.
3. Heating: most frequently the energy use of boilers for the production of hot water for heating, but also often the use of electric heaters for zonal reheat.
4. Pumps: for the circulation of heating hot water, chilled water and condenser water.
5. Cooling towers: for heat rejection. The primary energy use is the cooling tower fan and pumps. Power distribution systems and equipment used to drive
HVAC machinery, motors and other auxiliaries can be complex to the non-electrical engineer. So, it should be address some basic electrical concepts that will be useful to HVAC engineers and other mechanical engineers in their day to day work. You may sects your learning as below:
Basic Electrical Concepts & Fundamentals,
Electrical Distribution Systems and Components,
Motors and Variable Speed Drives,
Electrical Energy Efficiency in HVAC Systems.
Types of HVAC Wiring Diagram
There are three basic types of wiring diagrams used in the HVAC/R industry today. The first and most common is the ladder diagram, so called because it looks like the symbols that are used to represent the components in the system have been placed on the rungs of a ladder. From this point forward, ladder diagrams will be referred to as “schematic” diagrams, or simply “schematics.” A typical schematic of a packaged air conditioner is shown in the below-listed wiring diagram.In HVAC electrical schematics, the symbols stand for various components in the circuit, and the lines stand for the wires connecting them. The intention of the overall schematic is to show how the circuit functions, not how it actually looks.
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