manufacturer's name when there is an existing
control system.
**************************************************************************
[Existing control system was manufactured by [_____]. Provide new
equipment compatible with the existing control system to the extent that
the direct interface uses the same control signal type and level over the
same calibrated range as the existing equipment.]
**************************************************************************
NOTE: Regarding the text below, indicate portions
of existing systems that are to be reused.
**************************************************************************
[Inspect and test reused portions of existing control systems, and furnish
a report to the Government identifying all inoperative components or system
deficiencies. The report shall include a cost estimate to correct
deficiencies, scheduled need dates for equipment shutdown for repairs and
connection to existing controls and systems. Proceed with repairs only
after receipt of Government approval. Diagnose and report any malfunctions
of existing control system device that occurs after the work commences.
The Government is responsible for maintenance and repair of Government
equipment. The Contractor shall be held responsible for repair costs due
to Contractor negligence or abuse of Government equipment.]
1.5
CENTRALIZED DIRECT DIGITAL CONTROL (DDC) SYSTEMS
**************************************************************************
NOTE: If DDC is being used, use Section 15910,
"Direct Digital Control Systems" in lieu of this
section.
**************************************************************************
DDC systems are not permitted. Microprocessor-based single-loop
controllers, unitary control system, variable-air-volume (VAV) boxes, and
room thermostats may be used provided that the devices are manually
configurable by the use of device firmware and require no software written
by the Contractor for their application and use.
1.6
PERFORMANCE REQUIREMENTS
Provide control systems to maintain the required heating, ventilating, and
cooling (HVAC) conditions by performing the functions and sequences of
operations indicated. Control systems shall be complete, including all
equipment and appurtenances, and ready for operation. Control systems
shall be furnished, installed, tested, calibrated, and started up by, or
under the supervision of trained technicians certified by the Contractor as
qualified and regularly employed in such work. Control system equipment,
valves, panels and dampers shall bear the manufacturer's nameplate.
1.7
DESIGN REQUIREMENTS
1.7.1
Control System Diagrams
For each system, indicate HVAC process flow and location of devices
relative to flow and to the HVAC control panel, the connections of control
devices in control loops, references of control device contacts and device
operating coils to line numbers of a ladder diagram and sequencing diagrams
showing the operation of valves, dampers, and contacts relative to
SECTION 15901N
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