shall be available on a real time basis; trend data shall appear
numerically and graphically on a connected computer's screen as the data is
processed from the DDC system. Trend reports shall be capable of uploading
to computer for storage.
2.1.3.13
Status Display
Current status of I/O and virtual points shall be displayed on command.
Points shall be associated into functional groups, such as all the I/O and
virtual points associated with control of a single air handling unit, and
displayed as a group, so the status of a single mechanical system can be
readily checked. A group shall be selectable from a menu of groups having
meaningful names; such as AHU-4, Second Floor, Chiller System, and other
such names.
2.1.3.14
Diagnostics
Each controller shall perform self-diagnostic routines and provide messages
to an operator when errors are detected. The DDC system shall be capable
of recognizing a non-responsive module on a LAN. The remaining, responsive
modules on a LAN shall not operate in a degraded mode.
2.1.3.15
Power Loss
During a power outage, each controller shall assume a disabled status and
outputs shall go to a user definable state. Upon restoration of power, DDC
system shall perform an orderly restart, with sequencing of outputs.
2.1.3.16
Program Transfer
Provide software for download of control programs and database from a
computer to controllers and upload of same to computer from controllers.
Every digital controller in the DDC system shall be capable of being
downloaded and uploaded to through a single controller on the highest level
LAN.
2.1.3.17
Password Protection
Provide at least three levels of password protection to the DDC system
permitting different levels of access to the system. The lowest level
allows monitoring only. The highest level allows full control of all
functions, including setting new passwords.
**************************************************************************
NOTE: Delete all paragraphs referencing the
workstation when no workstation is specified.
**************************************************************************
2.1.3.18
Energy Data Recording
Provide a resettable signal accumulation for each meter at the main
building digital controller.
a.
Calculate hot water thermal energy in W BTU/HR
using hot water supply temperature and flow and hot water return
temperature signals.
b.
Calculate chilled water thermal energy in W
BTU/HR using chilled water supply temperature and flow and chilled
SECTION 15910N
Page 31
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