Columns

• Sequences of Operation  An objective look at specified descriptions of control Part 1 of 2

• Programming Methods  A historical view as seen from one perspective

• Anatomy of a Typical BAS Analysis of a hypothetical commercial office building DDC system

• Words of Wisdom  Prudent advice from the pages of Practical Controls 

• Unitary Controllers Primer  Typical applications utilizing unit (zone) level control  Part 2 of 3 

• Controls Estimating 101  A beginner’s look at labor and material estimating for plan & spec projects 

• Typical Controllers in DDC  Understand the differences in controller types and applications  Part 1 of 3

• How Safety Devices (Should?) Affect System Components  Simple, albeit important, rules of thumb regarding equipment failsafe modes  

• RTU Zoning Systems  Getting more out of your single zone constant volume rooftop units

• Short on I/O? Try This Out!  Tricks of the trade, time-tested and industry-accepted

• Wiring For Combustion Air  Prove the presence of the combustion air source before allowing the boiler plant to operate 

• Terms & Terminologies – Avoiding Confusion  A closer look at some of the words and phrases that we sometimes take for granted

• Electric Duct Heaters – Application & Control  Avoid application errors and controllability issues when designing EDH control systems 

• Pressure Transmitters – Selection & Placement  Understand the concepts behind sizing and locating static and differential pressure transmitters

• Rooftop Unit Economizer – Operation & Control  Perform the economizer functions of a packaged rooftop unit using digital control 

• RTU Operation Via Conventional & Digital Controls Control a packaged rooftop unit with a thermostat, or digitally via a building automation system 

• Interlocking of AHU Safety Devices  Design and fabricate a control panel specifically for the safety device interlocking.

Professional Information

Steve Calabrese attended the University of Illinois at Chicago (UIC) and graduated in 1990 with a B.S. degree in electrical engineering. He began his HVAC career as a design engineer at Air Comfort Corporation, a family-owned mechanical services company. In 1993, Steve went to work for Midwest Mechanical Construction Company, a large, full service mechanical contractor serving the greater Chicagoland area. During his eleven years there, Steve migrated through various roles as mechanical systems designer, control systems engineer, controls group manager, and engineering manager.

In 2003 Steve’s book, Practical Controls: A Guide to Mechanical Systems, was published. Steve brings his mechanical contracting experiences to this writing, and offers practical approaches to control systems issues.

In 2004 Steve left the mechanical contracting end of the industry to go to work for what is now Chicagoland’s branch office of Automated Logic Corporation. As a project manager, Steve’s day-to-day operations included engineering and estimating, control systems design and consultation, parts selection and procurement, installation management and field supervision, startup and commissioning support, and project fiscal and schedule management.

In 2008, Steve joined Control Engineering Corporation as a sales engineer, and is currently bidding projects in the retrofit/negotiated work markets, as well as the plan/spec markets.

As a member of several professional associations, Steve actively participates in local seminars and training endeavors. He attributes his HVAC knowledge and expertise to working many years for a mechanical contractor, and couples his broad mechanical knowledge and experience with a strong background in the area of electricity and electronics. You can visit his website at www.pcs-engineering.com

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