[_____] percent of the original setting for excess combustion
air]. Combustion efficiency shall not be less than that specified
in the boiler specification.
2.6
Boiler Control and Instrument Cabinet(s)
Provide boiler control and instrument cabinet(s) as specified in FS F-B-2902,
and may be mounted either on the boiler front or adjacent thereto. The
arrangement may also consist of a boiler mounted cabinet containing
controls normally provided by the manufacturer and a supplementary cabinet
containing controls normally provided by the manufacturer and a
supplementary cabinet containing additional controls and instruments
required herein. [[Plant master combustion control] [and] [steam flow
recorder] shall be mounted on or be adjacent to control panel for number
[_____] boiler.]
2.7
Free-Standing Multi-Boiler Plant Control and Instrument Panel
Provide a free-standing panel and locate as indicated. The panel shall
contain all multi-boiler controls, monitoring systems, and panel mounted
instruments specified herein and in the reference specifications, except
that flame safeguard systems may remain separately mounted in a cabinet at
each boiler.
2.7.1
Control Panel Construction
Control panel shall be constructed of not less than 11 gage (3 mm) (0.1196
inch) reinforced steel for face, top, and sides. The enclosed panel shall
be not less than 610 mm 24 inches in depth with inside rigidly welded
braces. Control panel shall be designed so that all indicating and
recording devices and manually operated switches shall be flush mounted in
a gasketed removable top front panel with indicating and recording devices
at eye-level. A similar removable top rear panel located opposite front
panel shall be provided to facilitate wiring, piping, and maintenance.
Other operating controls shall be installed on a sub-panel within the
enclosure. Access to panel enclosure shall be through gasketed, double
piano-hinged doors of not less than 16 gage (1.52 mm) (0.0598 inch) steel.
Reinforced doors to prevent sagging and provided with a 3 point compression
type fastener and polished key lock handle. A full width fluorescent
lighting canopy shall be prime coated and finished in baked enamel.
Identify flush mounted devices with engraved lamicore nameplates.
Adequately reinforce, suitably skirt, and suitably design panel base to
permit anchoring to the floor or foundation.
2.7.2
Control Panel Wiring and Piping
Control panel shall be factory pre-wired in accordance with NFPA 70. Wire
shall be thermoplastic Type THW, THWN, XHHW, or UL approved for the
intended use, color or number coded, and run in plastic ducts to numbered
terminal blocks. Control circuits shall be separately fused with properly
rated cartridge type fuses. Power leads to and from magnetic starters and
contactors shall terminate at terminal blocks so that no field wiring in
control compartment is necessary except from terminal blocks to external
equipment. Control leads to and from external control devices shall
terminate at separate terminal blocks from power leads. Steam, draft, and
air operated devices shall be factory piped to permanently affixed external
connections. Pneumatic signals shall be either 20 to 103 kPa (gage) 3 to
15 psig or 20 to 207 kPa (gage) 3 to 30 psig. Piping connections to
indicators shall be copper tubing conforming to ASTM B 88M ASTM B 88. The
SECTION 15517N
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