to the chiller to accomplish the chiller sequence of
control.
Capability: Point parameters read by the DDC
network shall be available for analysis, trending,
alarming, and other functions that are available for
other similar parameters that are native to the DDC
network. Any point scaling, unit conversion, or
other manipulation necessary for correct program
execution shall be programmed in the controller
logic or communication gateway and transparent to
the end user.
Method: Exchange of information noted in Table (1)
shall be over a single communication cable between
communication ports on the chiller and DDC network.
A gateway or translator device is allowable between
communication ports if necessary. The gateway and
communication cable must meet all relevant criteria
in the project specification.
Presentation: All read and write point information
listed in Table (1) shall be presented at their
relevant locations in real time engineering units at
the operator workstation.
Table (1)
Shared Information Between Chiller and Building DDC
Point/Parameter
Units
Write to Chiller
Read by DDC
Chiller Enable
On/Off
X
Chilled Water Supply
Temperature Set Point
deg. F
X
Chilled Water
Supply Temperature
deg. F
X
Chilled Water
Return Temperature
deg. F
X
Entering Condenser
Water Temperature
deg. F
X
Phase A Motor Current
Amps
X
Accumulated Run Time
Hours
X
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a. [Remove existing and] [provide new] [and] [modify existing] DDC
systems including associated equipment and accessories.
Manufacturer's products, including design, materials, fabrication,
assembly, erection, examination, inspection, and testing shall be
in accordance with ASME B31.1 and NFPA 70, except as modified
herein or indicated otherwise.
b.
Provide the DDC systems to maintain stable temperature control and
all other conditions as indicated. The end-to-end accuracy of the
SECTION 15910N
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