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HVAC Testing, Adjusting and Balancing (TAB)

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HVAC Testing, Adjusting and Balancing (TAB)

Testing, Adjusting, and Balancing also known as TAB, is a systematic process or service applied to heat ventilating and air-conditioning (HVAC) systems and other environmental systems to achieve and document air and hydronic flow rates.

  • Testing is the use of specialized and calibrated instruments to measure temperatures, pressures, rotational speeds, electrical characteristics, velocities, and air and hydronic quantities for an evaluation of flow conditions
  • Adjusting is the varying of system flows by partially closing balancing devices, such as dampers and valves, and varying fan speeds to achieve optimum system operating conditions within design and installation limitations
  • Balancing is the methodical proportioning of air and hydronic flows through the system mains, branches, and terminal devices using acceptable procedures to achieve the specified airflow or hydronic flow within testing and design limitations.

A test and balance are critical to ensuring that your location is built with the HVAC system that you specified, and so that it operates as efficiently and comfortably as possible. In other words, it is an overall health check for your HVAC Systems, to make sure the equipment is mechanically sound, that there is a positive building pressure, and that the thermostat and air flow are adjusted properly. The test and balance technician should be certified by a National Organization such as NEBB, AABC or TABB to ensure that basic qualities are met and industry accepted procedures are used.

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