Commissioning

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A guide to proper relief air plenum pressure sensor installation for stable and effective AHU control.

Combine equipment startup and system commissioning into a single, streamlined process to improve quality control and efficiency.

A 251-site test-and-balance field study across forty national and regional quick-service brands found 91% running net-negative pressure, 46% of make-up air units not working, and a median imbalance of nearly 1,900 CFM.

An overlooked control logic detail in hospital air handling units led to recurring freezestat trips and heating instability during the winter, illustrating how small automation choices can have big operational impacts.

Commissioning Columnist Miles Ryan shows how a programming oversight caused unexpected humidity control failures during system transitions.

When air handlers first enable economizer mode, overlooked control sequences can trigger temperature and humidity spikes that pose real risks to critical environments.

How building owners and operators are rethinking performance, resilience, and compliance as new pressures reshape the industry.

When a bronze valve met incompatible boiler chemicals in a hospital, the result was catastrophic: widespread system failure and costly damage, all avoidable with a single review step, says John Rophael, P.E., mechanical engineer at Engineering Design & Testing Corp. 

Dive into how chiller rotation sequences in variable flow HVAC systems can unexpectedly disrupt operations – and how refined automation logic can help keep things running smoothly.