The days of burying your head in the sand and saying, "None of my customers use the Web," are gone. Instead, we need to better understand the Internet and how it is used by our customers to determine its place in our business.
York International Corporation has opened what it says is a unique underfloor air distribution laboratory at its world headquarters. The company intends to use the lab for research, training, and demonstrations.
To fully understand how to install a high-velocity HVAC system, one must know what it is and what it does. This article provides some background and the key steps to a successful installation.
If you want to stretch your ad dollars as far as possible, publicity is a way for contractors to catch a “free ride.” Free publicity can’t replace advertising as a way to generate leads. But it can increase your company’s name recognition and remind customers of your existence.
This article is the second installment of a two-part series. Part One provided some background on screw compressors, then discussed the various components and capacity control methods. Part Two discusses maintenance of the screw compressor.
If you listened carefully to what was being said by exhibitors in the designated Building Automation and Control Showcase area at the 2003 AHR Expo, chances are the words “interoperability” and “open system” cropped up sooner or later.
The following results come from a survey of 4th grade students who watched a presentation on the career of an HVACR service technician. For the full text of the story on this presentation, read the column, “Getting Fourth Graders Interested In HVACR,” in the February 24, 2003 issue.
Screw compressors can be either twin helical screws or a single screw design. They can be open drive, semi-hermetic, or hermetic in configuration. In addition, there are oil-flooded compressors and non-oil (dry) compressors.
For small valves up to and including 8 inches, the recommended direction of refrigerant flow is from under the seat. In this installation, the stem torque required to close the valve under system pressure is generally manageable. For larger valves, this same flow direction can create a problem.