UNDERWRITERS LABORATORIES (UL)
UL 1449
(1996; Rev thru Jul 2002) Transient
Voltage Surge Suppressors
UL 506
(2000; Rev thru Feb 2004) Specialty
UL 916
(1998; Rev thru Feb 2004) Energy
Management Equipment
1.2
RELATED REQUIREMENTS
Section 15050N BASIC MECHANICAL MATERIALS AND METHODS, applies to this
section, with the additions and modifications specified herein.
1.3
SUBCONTRACTOR SPECIAL REQUIREMENTS
Perform all work in this section in accordance with the paragraph entitled
"Subcontractor Special Requirements" in Section 01310 ADMINISTRATIVE
REQUIREMENTS. The paragraph specifies that all contract requirements of
this section shall be accomplished directly by a first tier subcontractor.
No work required shall be accomplished by a second tier subcontractor.
1.4
DEFINITIONS
1.4.1
Digital Controller
A control module which is microprocessor based, programmable by the user,
has integral input/output within the module or on network connected
modules, and performs stand-alone operations.
1.4.2
Direct Digital Control (DDC)
Digital controls, as defined in this specification, performing control
logic. The controller directly senses building environment and makes
control decisions based on user defined, controller resident programs. The
controller outputs control signals that directly operate valves, dampers,
and motor controllers. No conventional control devices, pneumatic or
electronic, such as receiver-controllers, thermostats, and logic units are
present within or interface with a direct digital control loop. Actuators
are electric or pneumatic, and the controller output is converted to the
appropriate type of signal.
1.4.3
DDC System
A system made up of one or more digital controllers which communicate on a
network.
1.4.4
Distributed Control
The intent of distributed control is to install the controllers near their
respective controlled equipment. The control system consists of
stand-alone controllers, with the total number of input and output points
limited to 48 or less per controller. Failure of any single controller
will not cause the loss of more then 48 control points.
SECTION 15910N
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