" Refrigeration" is sometimes added to the field's abbreviation as HVAC&R or HVACR, or "ventilation" is dropped, as in HACR (as in the designation of HACR-rated circuit breakers). HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer.
Its goal is to provide thermal comfort and acceptable indoor air quality.
Heating, ventilation, and air conditioning ( HVAC) is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. The safety interlock switch is at the bottom left. The fan enclosure is directly behind the board, and the filters can be seen at the top. The wires connecting to the blue terminal block on the upper-right of the board lead to the thermostat. The control circuit in a household HVAC installation.
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