Testing, Adjusting and Balancing (T.A.B.) are the three major steps used to achieve the proper operation of HVAC systems.

Testing is the use of specialist calibrated instruments to measure the velocity and/or volume of air and/or water for an evaluation of equipment and system performance.

Adjusting is the final setting of devices such as dampers and valves, adjusting fan and pump settings and the setting of parameters of automatic control devices such as thermostats and differential pressure switches to achieve maximum specified performance and efficiency.

Balancing is the regulation of flows (air or water) to achieve the desired or specified design air or water flow. The terminal with the least amount of flow in regards to the engineer’s drawing is first identified. All other diffusers/grilles (air) or circuit balancing valves (water) are then systematically adjusted to proportionally balance with the original “low” terminal. There must be at least one terminal that is wide open to achieve optimum efficiency.

Generally, this procedure is carried out as part of the Commissioning Programme following the installation of new systems, but it can also become necessary if an existing system has been subjected to modification, or if zoned spaces served are subsequently resized or subdivided in some way.

Balancing is usually based upon the design flow values established by the Mechanical Design Engineer for the project, and a report is submitted which summarizes the testing and balancing and notes any deficiencies found.

Conair UK Ltd are happy to discuss and arrange your commissioning and T.A.B. requirements.

​Contact us to find out more.