AAF International Millennium - Manual (Page 6)

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CAUTION: To avoid permanent damage to the solid state control:
1. DO NOT connect 120V to the “PS” terminals.
2. DO NOT connect 120V to any of the “Output” terminals.
3. DO NOT connect an “Output” terminal to ground. The fuse on the
panel does not protect from a direct short.
Power should be supplied to the solid state timer board across
terminals L1 and L2 as shown on the connection diagram. When
the power is energized, the “Power On” light should illuminate.
The collector should not be permitted to pulse for an extended time
without compressed air supplied.
CAUTION: Operation without compressed air can damage the
solenoid valves.
The pulse interval and duration is controlled by the solid state timer.
The pulse interval (Time Off) is factory set at 10 seconds and should
be reset to 30 seconds, which is satisfactory for most applications.
However, since dust loads, media velocity, and other factors vary, it
may be necessary to readjust (field adjustable to 255 seconds) the
pulse interval to meet individual requirements. Contact your AAF
representative for assistance. The duration (Time On) is preset at
100 milliseconds.
CAUTION: The duration (Time On) should not be adjusted without
consulting your AAF representative.
SEE BULLETIN E-97 FOR COMPLETE INFORMATION ON
SETTING THE DCT CONTROL.
3.7 Compressed Air Connections
Compressed air must be clean, dry, and pressure regulated to avoid
failure or plugging of the pulse valves. Compressed air filters are
recommended for removal and automatic discharge of minute
particulate contaminants and coalesced liquids. A pressure regulator
is needed to ensure that the compressed air supply does not exceed
100 psig. If the dust collector is located outdoors, care must be taken
in choosing these devices and their locations to ensure that their
temperature limits are not exceeded.
A pressure gauge is supplied by AAF and should be installed in the
compressed air supply line near the compressed air manifold. The
pressure gauge should be positioned so that it can be easily read.
3.8 Bag, Cage and Venturi Assembly, and Pulse Pipe Installation
The bag, cage and venturi assembly, and pulse pipe assembly are
illustrated in Figure 6. Ensure the inlet and outlet ductwork is
connected and that the clean air plenum has been cleaned, before
installing the bags.
Always handle the filter bags with care and keep them dry. Pleated
bags are installed in a similar manner to standard bags; however, no
cage is required.
CAUTION: During reinstallation of pulse pipes, ensure the holes in
the pipe align over the center of the venturi and point downward.
3.9 Roof Doors
After the bags, cage and venturi assemblies, and pulse pipes have
been installed, replace and secure the roof doors. Two men are
required to handle these doors, as each door weighs approximately
100 pounds. Rotate the clips between adjacent doors, and tighten
wing knobs. Ensure that all doors are fully sealed.
3.10 Gauge Installation
It is recommended that a suitable pressure gauge be installed before
initial startup, for measuring collector pressure drop (AAF offers an
optional Magnehelic pressure gauge or a Photohelic gauge/switch).
Using appropriate tubing and connectors (copper or aluminum tubing
is recommended), connect the gauge high-pressure port to the static
tap in the housing side (lower pressure tap) and connect the gauge
low-pressure port to the static tap on the side of the clean air plenum
(upper pressure tap).
3.11 Explosion Vent Installation
The optional explosion vents are factory installed. The guard
to contain and prevent damage from a rapidly opening vent is
supplied separately and must be field installed. Refer to the
installation drawing supplied with this option for details. Explosion
vents should be installed in accordance with local, national, and
all other applicable codes.
3.12 Hopper Discharge Device
If supplied, attach the hopper discharge device in accordance with
manufacturer’s instructions.
The collector is now ready to be started. Review the instructions thus
far in this bulletin and inspect the collector to ensure that everything is
assembled correctly. Ensure that bolted joints and connections are
properly tightened.