2.5.15.1
Panel Board
A free-standing master panel board shall be floor-mounted on a 100 mm 4 inch
concrete curb and provided with vibration isolators between panel and
anchor bolts. The control panel shall be constructed of specially leveled
steel sheet not less than 4.8 mm 3/16 inch thick with adequate structural
steel framework to provide a rigid unit. The panel shall be provided with
gaskets and other seals necessary to form a dust-tight enclosure of the
controls conforming to NEMA ICS 1standards. Nameplates shall identify all
controls and instruments. The panelboard shall match the boiler control
units and distribution panel in appearance, unless it is a console type. A
suitable plug-in strip shall be provided on the rear of the panel for any
required plug-in electrical connections of the instruments. All necessary
piping or electrical connections and all necessary devices for a complete
operating installation shall be provided. Suitable single strip, rapid
start fluorescent lighting with a panel-mounted toggle switch shall be
supplied for a panelhood. A single, pull chain, ceiling light receptacle
shall be installed in the interior of the panel enclosure and wired to the
common point of electrical supply.
2.5.15.2
Distribution Zone Valve Controls
A manual valve control for each zone control valve shall be provided on the
master panel. Instruments shall be provided to indicate the position of
each valve operator.
2.5.15.3
Expansion Tank Water Level Indicator
A water level indicator shall be provided on the master control panel and
shall be of the remote reading, liquid level indicator type. The
indicating scale shall show uniform divisions for all level changes and
shall require no liquids for calibration other than the expansion drum
water. The instrument shall be suitable for 2,758 kPa 400 psig operating
pressure. The instrument shall be so connected and calibrated that it will
indicate levels of [_____] mm inches to [_____] mm inches above the outside
bottom of the expansion tank. The primary or transmitting elements shall
be located at the liquid level control station as shown. The instrument
shall be so located and calibrated that the center point of the indicator
will show the normal water level in the tank at [_____] mm inches above the
tank bottom.
2.5.15.4
Annunciator
An annunciator system shall be provided with a semiflush mounted panel.
Annunciator system shall indicate and alarm on the following:
a.
Expansion Tank:
Overflow level
Normal level
Combustion cutout level
Low pressure
b.
Dump tank:
Overflow level
Low pressure
SECTION 15555A
Page 45
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