pointer indicating type, with a [15] [30] [60] -minute interval.
Meter accuracy shall be within plus or minus one percent. The
correct multiplier shall be provided on face of meter.
b.
Current Transformers: ANSI C57.13. Provide three current
transformers with 600-volt insulation, rated for metering with
voltage, BIL, momentary, and burden ratings coordinated with the
ratings of the associated meters. Provide a butyl molded donut or
window type transformers mounted on a bracket to allow secondary
cables to connect to the transformer bushings. Identify the
wiring of the current transformer secondary feeders to permit
field current measurements to be taken with hook-on ammeters.]
**************************************************************************
NOTE: Locate steam meters in piping in accordance
with ASME, Fluid Meters; Their theory and
applications, Sixth Edition, 1971.
**************************************************************************
2.2.9.2
Steam Meters
[Requirements for steam meters is specified in Section 02554, "Exterior
Aboveground Steam Distribution".
Integrate steam meter consumption signal
into the DDC system.] Provide vortex steam meters as shown on drawings.
Steam meters, on pressure lines below 100 psig, or where pressures may
fluctuate, shall be pressure compensated. All steam meters shall have a
minimum turndown ratio of 10 to 1. Meter signal output must be compatible
with DDC input. DDC shall measure both instantaneous and accumulated steam
flow.
2.3
OUTPUT HARDWARE
2.3.1
Dampers
**************************************************************************
NOTE: Use parallel blade dampers for mixing boxes
and when two-position control is required. Use
opposed blade dampers when modulating dampers on air
outlets of small cooling tower; use parallel blade
dampers for face and bypass control. Show the
dampers on the contract drawings. Indicate parallel
blade or opposed blade dampers as appropriate for
each application.
**************************************************************************
Damper shall conform to SMACNA HVAC Duct Const Stds.
a.
A single damper section shall have blades no longer than 1220 mm
48 inches and shall be no higher than 1830 mm 72 inches. Maximum
damper blade width shall be 203 mm 8 inches. Larger sized damper
shall be made from a combination of sections.
b.
Dampers shall be steel, or other materials where shown. Flat
blades shall be made rigid by folding the edges. Blades shall be
provided with compressible seals at points of contact. The
channel frames of the dampers shall be provided with jamb seals to
minimize air leakage. Dampers shall not leak in excess of 102 L/s
per square meter 20 cfm per square foot at 996 Pa 4 inches water
gage static pressure when closed. Seals shall be suitable for an
SECTION 15910N
Page 40
Previous Page
