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HVAC Concepts (HVACC)
Controls Contractor, System Integrator, and Manufacturer
  • HVACC has been in business over 19 years -- concentrating on controlling and monitoring facilities throughout the Washington, DC Metropolitan area.
  • HVACC identified the change in the control industry from proprietary to interoperable systems and has made substantial investments in understanding, integrating and supporting LonWorks based systems.
  • HVACC has maintained and supported all of its installed systems. Over 99% of all systems ever installed in the company's 19 year history are still running at 100% capacity.
  • HVACC operates a 24-Hour Monitoring and Service Center to handle alarm functions and customer service needs.
  • HVACC can select, install, integrate, and support LonWorks based products from hundreds of manufacturers including products from leading national controls companies. This enables HVACC to select the BEST product available for the application.
  • HVACC is an Authorized Tridium System Integrator and is experienced in presenting LonWorks, Bacnet, Modbus, and several proprietary control networks via the web with the Tridium JACE Controllers.
  • HVACC is committed to continue developing its web site and web services to provide easy access to: (1) support data (control drawings, data sheets), (2) site data (alarm information, service call tracking, multiple site reports, utility reports), and (3) software and site specific file updates.
HVACC: Multi-Compressor Turbocor Retrofit Controller
Posted by: ddrury
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HVACC / Company Local control and display for Turbocor retrofit of 270 ton Carrier 23XL Screw Chiller. Tridium JACE-2 Controller running Niagara AX using hardwired I/O, Modbus for full status reporting from compressors, BacNet/IP for integrating data with building automation system. A HVAC Concepts, Inc. Field Display directly connected to the JACE-2 via its second Ethernet port is used for a local display. The chiller controller provides a full featured sequence to properly run and manage a centrifugal chiller and associated equipment.

Why a Turbocor Retrofit? Efficiency is of utmost importance in today’s world of escalating utility costs and chillers are by far the biggest energy consumers in the building. However, replacing the chiller is not always the best option, especially when the mechanical equipment is difficult to reach with a crane or is below grade. The largest chiller efficiency gains are accomplished through compressor technologies and intelligent digital control. Retrofitting an existing chiller with Turbocor compressors can often show the best life-cycle return on investment.

Rear View - Retrofit

Suction View - Retrofit

Starting - Stock Carrier Screw
The Turbocor Retrofit was preformed by our mechanical partner NAC (Noyes Air Conditioning). NAC is committed to having a retrofit installation equal a new chiller in quality and warranty. Before installation the barrels are examined and eddy current tested. This coupled with an extended warranty of the compressors enables NAC to provide a 5-year warranty on the entire chiller, which is better than most new equipment. Most importantly, the cost is considerably less than a complete replacement. Contact Donnie Connor at NAC for more information (301) 670-6300.

About Danfoss Turbocor (
Danfoss Turbocor’s family of compressors, the world’s first totally oil-free compressors, are specifically designed for the Heating, Ventilation, Air Conditioning and Refrigeration (HVACR) industry. The convergence of aerospace and industrially proven technologies which include magnetic bearings, variable-speed centrifugal compression and digital electronic controls, enable the Turbocor family of compressors to achieve the highest overall efficiencies for middle-market, water-cooled, evaporatively cooled and air-cooled HVACR applications.

About Tridium (
Tridium is the inventor of the Niagara Framework®, a software framework that integrates diverse systems and devices - regardless of manufacturer, or communication protocol - into a unified platform that can be easily managed and controlled in real time over the Internet using a standard web browser. Niagara is an extensible platform that supports the rapid development of device-to-enterprise applications and Internet-enabled products.

Note: The Turbocor compressors are amazing. With only pumping background noise going from off to full load (close to 300 tons) there is no outright cues that the compressor is running – no noise, no vibration, nothing. If you’re not looking at readings telling you the compressor is running you wouldn’t believe it. Wow.

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HVAC Concepts, LLC / 5123 Pegasus Court - Suite T / Frederick, MD 21704 / (301) 670-0044
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