Eatherton

The “state of the art” heating systems at the time were appliances with a basic thermal efficiency of around 60 to 80 percent.

This is the third and final part of a three-article series addressing the problems associated with DHW recirculation systems.

The appearance of flux corrosion differs from HEC (hydraulic erosion corrosion) in that there are less U-shaped signs than random holes in the piping system.

Some cross-connection problems can be masked by other problems common to large, DHW distribution systems.

I was honored to spend the day working with a young technician by the name of Oscar Varela.

In this, the final article on commissioning, we will discuss the other parameters in need of testing and documentation.

Today’s boilers come with turndown ratios that result in having to test the appliance at a minimum of three different points on the appliance’s modulating scale.