[an error occurred while processing this directive]
(Click
Message to Learn More)
Control System Retrofits
Many buildings though are
operating with the same control systems that were installed when the
building was constructed, ten or more years ago
.
- Pneumatic or DDC:
Control systems that are
reliant on pneumatic or electromechanical controls tend to require more
maintenance, and are harder to optimize than those that are completely
digital. Ideally we like to upgrade pneumatic systems including
thermostats and actuators to all DDC whenever feasible. This
provides for better control and comfort and allows for enhanced
optimization.
- Open or Proprietary:
The use of open
protocols including BACnet and LonWorks provides numerous benefits and
are broadly supported. Whenever possible we like to see control
systems upgraded so that they are supporting and when possible,
utilizing open protocols. We also like to see control systems
moved to network (IP) communications for enhanced flexibility and
performance.
- Web or PC based User Interface:
Older control
systems generally used a PC based user interface program, often called
a thick client. Operation can generally only be done at the
workstation that has the application loaded and support often requires
specific versions of an operating system. The use of a web based
user interface provides added flexibility and only needs to be updated
at a single location.
- [an error occurred while processing this directive]
Level of Supplier Support:
Most BAS system
suppliers work hard to keep their products available for use on system
expansions and for service parts for as long as possible. Still,
these controllers utilize components such as processors and memory
chips that are simply no longer being produced. As a result, an
older control system product is often indicated as being at “end of
life” beyond which new production may no longer be possible.
Suppliers are pretty good about maintaining parts for a number of years
past this point, but if you have a control system with parts that
are no longer supportable, you should give serious consideration to
upgrading or replacing the system.
When considering upgrading or replacing an existing control system, we
recommend starting with a careful examination of how well the system is
working, what needs to be replaced or upgraded, and how satisfied the
owner is with the existing system and the supporting supplier or
contractor. In many cases, it makes sense to work with the
existing supplier to upgrade the system, but it is also a good idea to
carefully consider all options, including system replacement. On
many projects, it has been less expensive and offered improved
performance to replace an old system with a new open system.
About the Authors
Paul and Ira first
worked together on a series of ASHRAE projects
including the BACnet committee and Guideline 13 – Specifying DDC
Controls. The formation of Building Intelligence Group provided them
the ability to work together professionally providing assistance to
owners with the planning, design and development of Intelligent
Building Systems. Building Intelligence Group provides services for
clients worldwide including leading Universities, Corporations, and
Developers. More information can be found at www.buildingintelligencegroup.com
We also invite you to contact
us directly at Paul@buildingintelligencegroup.com
or ira@buildingintelligencegroup.com
footer
[an error occurred while processing this directive]
[Click Banner To Learn More]
[Home Page]
[The
Automator]
[About]
[
Subscribe
]
[Contact
Us]