i.
Final connections to HVAC control panel bulkhead fittings shall be
exposed tubing approximately 305 mm 12 inches long.
j.
Tubing and two insulated copper phone wires for installation
checkout may be run in the same conduit. Tubing and electrical
power conductors shall not be run in the same conduit. Control
circuit conductors, 24 V or less, may be run in the same conduit
as polyethylene tubing.
3.1.9
Wiring
a.
Provide wiring external to control panels, including low-voltage
wiring, in metallic raceways. Install wiring without splices
between sensors, transmitters, control devices, and HVAC control
panels. Install instrumentation grounding as necessary to prevent
ground loops, noise, and surges adversely affecting operation of
the system. Tag cables, conductors, and wires at both ends, with
identifiers indicated on shop drawings.
b.
Other electrical work shall be specified in Section 16402 INTERIOR
DISTRIBUTION SYSTEM. Provide step-down transformers where control
equipment operates at lower than line circuit voltages.
Transformers serving individual heating, ventilating, and
air-conditioning units shall be fed from fan motor leads, or fed
from the nearest distribution panelboard or motor control center,
using circuits provided for that purpose.
c.
Ground control panels and cabinets as specified in Section 16402
INTERIOR DISTRIBUTION SYSTEM. Grounding of the green ac ground
wire at the breaker panel alone is not adequate. Install ground
wire from each control panel to adequate building ground.
3.1.10
Foundations and Housekeeping Pads
Provide 80 mm 3 inch high concrete foundations and housekeeping pads for
the HVAC control system air compressors.
3.1.11
Compressed Air Stations
Mount air compressor assembly on vibration eliminators, in accordance with
ASME BPVC SEC for tank clearance. Connect air line to the tank with a
flexible pipe connector. Install compressed air station specialties with
required tubing, including condensate tubing to a floor drain.
3.1.12
Control Drawings
Post laminated copies of as-built control system drawings in each
mechanical room.
3.2
ADJUSTMENTS
Calibrate instrumentation and controls, and verify specified accuracy using
test equipment traceable to National Institute for Science and Technology
(NIST) standards. Adjust controls and equipment to maintain conditions
indicated, to perform the functions indicated, and to operate in the
sequence specified.
SECTION 15901N
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