2.22.2.5
Volume Control Device
The input of the vacuum producer shall have an adjustable air volume
control device to prevent accidental overload and to provide a means of
adjusting the upper design capacity limit. The volume control device may
be built-in or immediately adjacent to the first or input stage of the
exhauster and shall be preset by the manufacturer during certification
procedure.
2.22.2.6
Exhaust Silencer
The vacuum producer shall output to an air discharge silencer of the
open-bore expansion type. No interior baffling or shrouding will be
permitted. The silencer shall satisfactorily attenuate air noise to a
level below 85 dB.
2.22.2.7
Controls
Electrical controls for the vacuum producer shall consist of a combination
across-the-line magnetic starter with time-delay-fused disconnects, a
running-hour meter to total the number of hours of operation, stop-start
button, and a red or amber warning light and an audible alarm to indicate
shutdown due to fuse failure. The controls shall include a complete
low-voltage (24 volts ac) remote control function with a control panel for
remote operation of the exhauster. The low-voltage remote control panel
shall contain an on-off switch for the vacuum producer, a pilot light to
indicate operation, and a certified vacuum gauge reading in kPa inches of
water to indicate the vacuum within the system at all times.
2.22.2.8
Central Separator
The central separator shall be a freestanding unit of heavy-gauge steel and
all-welded construction. The separator chamber shall be of the cyclonic
type and shall effectively separate and trap all particulate matter
contained in the vacuum input. The internal configuration of the separator
shall be such that air leaving the cyclonic chamber shall be directed
upward through filter bags to effect final cleaning of the air before its
entry into the vacuum producer. The lower part of the separator enclosure
shall contain an easily accessible and serviceable debris container. The
container shall lock into operating position to form a positive seal
between the removable container and the separator enclosure. The debris
container shall be removable and reinstallable without the use of tools.
The container shall be equipped with casters to facilitate moving for
emptying and reinstallation alignment and shall have a pivoting handle to
facilitate handling. The separator shall be equipped with a filter-shaker
mechanism actuated by an electric motor operating through mechanical
linkage to the shaker mechanism. An electrical switch to control the
shaker motor shall be on or adjacent to the separator. The separator shall
be equipped with an easily removed screw- or bolt-fastened access panel to
provide easy access for filter inspection and service.
2.22.2.9
Primary Separator
When necessary to satisfy specific design requirements, a primary separator
shall be used in addition to, and ahead of, the central separator. The
primary separator shall be of the cyclonic type and shall effect initial
separation of abrasive particulates before vacuum air and debris enter the
central separator. The primary separator shall be of heavy-gauge steel,
all welded-seam construction, and may be freestanding or wall-mounted.
SECTION 15405A
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