3.1.1
Wiring Criteria
a.
Input/output identification: Permanently label each field wire,
cable, or pneumatic tube at each end with unique descriptive
identification.
b.
Rigid or flexible conduit shall be terminated at all sensors,
panels, troughs, and output devices.
c.
Surge Protection:
Install surge protection per manufacturer's
specification.
d.
Grounding: Ground controllers and cabinets to a good earth
ground. Ground controller to a ground in accordance with Section
16402 INTERIOR DISTRIBUTION SYSTEM. Conduit grounding alone is
not sufficient; all grounding must have a direct path to building
earth ground. Ground sensor drain wire shields at controller end.
e.
Contractor is responsible for correcting all associated ground
loop problems.
f.
Wiring in panel enclosures shall run in covered wire track.
3.1.2
Digital Controllers
Do not divide control of a single mechanical system such as an air handling
unit, boiler, chiller, or terminal equipment between two or more
controllers. A single controller shall manage control functions for a
single mechanical system. It is permissible, however, to manage more than
one mechanical system with a single controller.
3.1.3
Temperature Sensors
Provide temperature sensors in locations to sense the appropriate
condition. Provide sensor where they are easy to access and service
without special tools. Calibrate sensors to accuracy specified. In no case
will sensors designed for one application be installed for another
application.
3.1.3.1
Room Temperature Sensors
Provide on interior walls to sense average room temperature conditions.
Avoid locations near heat sources or which may be covered by office
furniture. Room temperature sensors should not be mounted on exterior
walls when other locations are available. Mount center of sensor at 5 feet
above finished floor.
3.1.3.2
Duct Temperature Sensors
a.
Provide sensors in ductwork in general locations as indicated.
Select specific sensor location within duct to accurately sense
appropriate air temperatures. Do not locate sensors in dead air
spaces or positions obstructed by ducts or equipment. Install
gaskets between the sensor housing and duct wall. Seal duct and
insulation penetrations.
b.
String duct averaging sensors horizontally between two rigid
supports in a serpentine position to sense average conditions.
Insulate temperature sensing elements from supports. Provide
SECTION 15910N
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