The latest "progress" has yielded its own growing pains and pressures.

One more case where all seems fine … but isn’t.

Why did last month’s boiler system have the summertime blues?

Could detecting a manual override suggest deeper problems?

This is the second in a series of columns in which I am demonstrating examples of systems performance information that can be gleaned from trend log analysis. In these columns, I introduce a system or sub-system, show a trend graph, and then leave it up to the reader to discover the operational “issue” illustrated in the graph. The answer will be given at the start of the subsequent month’s column.

This is the first in a series of columns in which I plan to demonstrate examples of systems performance information that can be gleaned from trend log analysis. Whether the trended data comes from a BAS or from portable dataloggers, the analysis is the same.

Using data trend logs to supplement in-field functional performance testing (FPT) has always been an option in the commissioning process, particularly for HVAC systems controlled by DDC systems. As DDC system trending capabilities and computer hardware storage capacities have improved substantially over the past few years, I propose that trend logs be given a more prominent place in the commissioning toolbox.

The once fairly calm phase could now be a key to nipping integration issues in the bud.

We still face plenty of ways for start-up to be a let down.

As noted in last month’s column, accessibility to mechanical, electrical, and control system components is critical for sustainable systems operation. However, the design and construction industry is sorely lacking when it comes to agreeing on what appropriate accessibility means. In order to make a meaningful difference in how systems are delivered to owners/operators, it is critical to define measurable accessibility acceptance criteria early in the design phase and allow the commissioning professional to shepherd that criteria through the design, construction, and acceptance phases.