Being a “controls contractor” at heart, there is no other business type that can provide as high a level of support for programming sequences of operation. For a DDC control system, the sequence of operations is the center of the project and often the most challenging to compile. As seen time and time again, the control contractor on retrofit, service and construction projects becomes the heart and soul of the project. He brings together the mechanical and electrical systems of a building to work in harmony in spite of design inconsistencies. Through programming, almost any mechanical system can be brought under control, regardless of oversized heating and cooling coils that are difficult to tune or air handlers that are slightly undersized or chiller systems that don’t enjoy operating at low load systems.
By associating ourselves with the Johnson Controls Metasys family of products via our ABCS agreement, we have the technical products and software tools to perform virtually any sequence of operation regardless of how complex. This is true for the older N2 products as well as the BACnet Extended Architecture systems. The N2 products provide a standard question and answer solution through HVACPro. For more complex sequences, a DX-9100 controller is used that is fully programmable with process logic blocks and PLC code and is also expandable hardware wise with XT and XP modules. The new BACnet system uses the same hardware platform, the Field Equipment Controller (FEC), for all of it’s central mechanical systems. This software is even more flexible as it begins with a question and answer programming tool, SCT, but then modules or sections of the programming can become customized. The FEC is also expandable with IOM expansion modules.