In this column, I will describe the “issue” disclosed through analysis of the trend graph included in my March, 2012 “Commissioning” column. I will also introduce a new system, show its trend graph, ...

JANUARY 2012 TREND LOG ANALYSIS Last month’s trend graph was 24 hrs in the life of a large museum AHU in a northern climate. The constant volume system delivered constant 55°F supply air to terminal ...