AAF International Type LVN RotoClone - Manual (Page 4)

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design and specifications without notice.
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© 2008 AAF International
APC-3-519B MAR ’08 QG 500
Type N RotoClone ® , Model LV
A. Reduction in air flow at exhaust hoods:
1. Reduced exhauster flow due to pluggage.
2. Accumulations in ducts or hoods due to sticky nature of dust or
settling in ducts caused by low conveying velocities.
3. Addition of more exhaust points to the system.
4. High water level in RotoClone. This can be observed at the
level indicating tube.
5. Pluggage at the eliminator shelves or accumulations in impellers
or dirty air chamber.
6. Fan running backwards.
B. Reduced dust collection efficiency can be caused by:
1. Extreme reduction in air flow.
2. Low water level in RotoClone.
3. The unit out of level.
4. Corrosion or abrasion to impeller sections.
5. Material buildup inside collector.
C. Water entrainment in Exhauster Discharge:
1. Build up of water in the fan plenum. There is a drain hole near
the front of the fan discharge.
2. Excessive air flow through RotoClone. To stop entrainment
caused by excessive air flow, increase static pressure by partially
closing the outlet slide damper located on top of the RotoClone.
3. Surging of the RotoClone is a rocking of the water from end to
end in the unit. This can be caused by running the unit well
below its rated capacity or too high an external pressure
resistance. Contact your local AAF sales representative
for assistance.
4. Material buildup on mist eliminator baffles.
6.0 LV Bench
6.1 Description
The Model LV Collector
Downdraft Bench Unit is
a self contained work
station designed to
provide the convenience
of an industrial work
table and efficiency of a
built-in dust collector.
The large FRP grating
surface and shallow capture plenum form a dust free work surface
suitable for standing or sitting with plenty of knee and leg room.
6.2 Installation Instructions
The bench portion of the LVN bench ships separately for field
assembly and bolts to the LVN (see drwg. 1490812). Use Butyl
caulking in the transition joints. Side and back panels are standard.
A concrete floor that can support the LVN can support the N bench.
The 500 and 1000 size bench is 30 x 28 and the 1500 and 2000 size
bench is 30 x 56. The operating weight of the smaller unit will be
approximately 300 lb. and the larger unit will be approximately 600 lb.
The water for the bench is supplied from the LVN, and the water level
control (in the LVN) will make up for evaporation.
6.3 Operating Instructions
A. Filling
Fill the RotoClone with water as described in Section 3.1 of the
standard LVN RotoClone operating instructions.
B. Starting
Start the RotoClone fan motor. The fan motor is three phase and
needs to be checked for rotation. Rotation is clockwise looking from
the top.
C. Checkout
Check amps on motor and adjust slide damper on fan discharge
if fan exceeds full load amps. Should you have water droplets in
the fan discharge, you may find that the air volume is exceeding
the rating of your unit. Closing back on the damper should solve
this carryover problem.
6.4 Maintenance Instructions
A. Removal of Collected Material
Any material collected on the flat surfaces of the bench, as
well as material collected in the RotoClone, should be removed
at regular intervals. See previous maintenance section for
removal suggestions.
6.5 Troubleshooting
A. Reduction in downflow velocity
1. Reduced exhauster flow due to pluggage.
2. Accumulation in the dirty air ducts.
3. Water level in the LVN RotoClone too high.
4. Fan running backwards.
5. Pluggage in the RotoClone.
6. Reduction in airflow (See Section 5.1-A).
B. Reduction of dust collection efficiency
1. Low water level in the LVN RotoClone.
2. Unit not level.
3. Corrosion or abrasion to impeller or mist eliminator baffles.
4. Reduction in airflow. (See Section 5.1-A).
Maintenance Instructions continued