Explain the HVAC System operation and Maintenance with the help of a diagram.

The HVAC (Heating, Ventilation, and Air Conditioning) system is a critical component of facility management. It plays a vital role in maintaining indoor air quality, controlling temperature, and ensuring occupant comfort. A well-maintained HVAC system contributes significantly to energy efficiency, safety, and operational cost control in residential, commercial, and industrial buildings. This answer will explain the basic operation and maintenance of HVAC systems in the context of facility management, with the help of a diagram.

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1. Components of HVAC System

An HVAC system is composed of various components that work together to provide thermal comfort and acceptable indoor air quality. The major components include:

* Heating Unit: Often comprises furnaces or boilers that generate heat through combustion or electricity. In some systems, heat pumps are used.
* Ventilation System: Includes air ducts, fans, filters, and dampers. It ensures air movement, exhausts stale air, and brings in fresh outdoor air.
* Air Conditioning Unit: This includes evaporator coils, condenser coils, and a compressor. It removes heat from indoor air and maintains desired cooling.
* Thermostat: The control system that regulates temperature by signaling the HVAC system to turn on or off.
* Ductwork: A network of ducts used to distribute conditioned air throughout the facility.

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2. Basic Operation of HVAC System

The HVAC system functions through a series of processes involving heating, ventilation, and cooling. Below is a basic operational flow of a centralized HVAC system:

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