The BAS shall be Direct Digital Control (DDC) for
providing lower operating costs and ease of operation.
The BAS shall adjust building systems to optimize their
performance and the performance with other systems in
order to minimize overall power and fuel consumption of
BAS shall utilize `open' communication protocols, such as
BACnet or LONWORKS, to minimize the costs of
between building systems and control vendors. Other
open protocol language systems, such as LonTalk, may
also be used, provided there is compatibility with overall
regional and/or central monitoring and central strategies.
A/E to specify and include functional design manual,
hardware manual, software manual, operation manual,
and maintenance manual. BAS shall have energy
management and monitoring software.
In retrofits with an existing old-proprietary system in
place, it is recommended that life cycle cost analysis
determine between the complete replacement of the
existing system or integrating the existing system with
customized gateways. In the long term, with hardware and
software costs falling as capabilities increase, energy
savings are producing the paybacks required to justify the
complete control retrofit.
The system shall consist of series of direct digital
controllers interconnected by a local area network. BAS
system shall be accessible through a web browser. System
shall have a graphical user interface and must offer
trending, scheduling, downloading memory to field
devices, real-time "live" graphic programs, parameter
College Park, Maryland chilled water supply and return
154 F A C I L I T I E S S T A N D A R D S
Revised March 2005 PBS-P100