AAF International Type N RotoClone User Manual
Type N RotoClone
®
Hydro-static Precipitator Model B Arrangement C
Design 2 or 3, Size 1
1
⁄2 thru 6
Design 4 or 5, Size 8 thru 28
Installation, Operating and Maintenance Instructions
Better Air is Our Business
®
The Type N RotoClone is a complete dust control unit. Designed
to perform its various functions automatically, the RotoClone
requires very little maintenance. Like any other mechanical
equipment, however, it should have regular attention and be
operated according to instructions to insure long life and
trouble-free service.
Design 2 and 4 have the exhauster on the clean air side of the
Type N RotoClone. In the Design 3 and 5, the exhauster is on the
dirty air side and discharges into the Type N RotoClone.
It is recommended that the back page of this manual be filled
in with specific design details for future reference. These
include: design number, sludge ejector control device, operating
line, type of water level control and wiring diagram that applies
to this Type N RotoClone.
Operating Principle
The Type N RotoClone cleans the air by the combined action of
centrifugal force and a thorough intermixing of water and dust-laden
air. The dust is separated from the air by means of a water curtain,
created by the flow of air through a partially submerged stationary
impeller (see Figure 1). Air flowing through the impeller at a high
velocity conveys water with it in a very turbulent sheet. Additional
water is introduced at the narrowest portion of the impeller opening
through a specially designed slot at the bottom. Since there is a
certain pressure drop through the impeller, the water flows upward
through the slot in an attempt to reach the water level on the clean air
side. The water flow upward through the slot creates increased
interaction between the dust and water, thus, increased collection
efficiency. Since the water flows upward in an attempt to reach the
level on the clean air side of the impeller, the impeller opening can be
decreased (resulting in higher pressure drop and collection efficiency)
by raising the water level in the unit. This is accomplished by means
of an exclusive and patented variable water level control box. The
centrifugal force exerted by rapid changes in direction of flow causes
the dust particles to penetrate the water film and become permanently
trapped. (Figure 1).
Table of Contents
Operating Principle
Installation Instructions
A. Foundations
B. RotoClone Erection
C. Lubrication
D. Duct Connections
E. Water Supply Connection
F. Drain Connection
G. Fan Drain
H. Electrical Connections
I. Water Level Control Options
J. Flow Control Valve
K. Sludge Container
Water Level Control Box Arrangements
Operating Instructions
A. To Fill RotoClone
B. To Start RotoClone
C. To Stop RotoClone
Maintenance Instructions
A. Routine Maintenance
B. Correction of Poor RotoClone Operation
Type N RotoClone Performance Curves
Parts List for Sludge Ejectors Type W-2 and Type L2
2
Entrained moisture in the cleaned air is removed by specially
designed, wide-space chevron eliminators made in removable
sections for Size 11⁄2 through 6 and curved entrainment baffles for
Sizes 8 and larger.
The water in the reservoir is continually reused, and since the water
curtain is produced by the air flow, no pumps or nozzles are required.
The water level is maintained by the overflow weir in the control box
as long as a small amount of fresh water is supplied through the
make-up water connection or by electrical controls that automatically
add water, as required, to compensate for evaporation and water lost
as the collected dust is removed from the unit.
Sludge Ejector
The sludge hopper is designed with steep sides to prevent material
buildup on the hopper walls. The ejector is constructed for heavy duty
service and long life. The chains and sprockets are constructed of
wear resistant materials and the chain speed is slow enough to permit
sufficient dewatering of sludge.
There are two types of ejector designs. Sizes 11⁄2 thru 12 have the
“W” ejector system. Sizes 16 thru 48 use the “L” ejector system.
Figures 9 and 10 show the designs and designate the appropriate
replacement parts by part number.
The sludge ejector is operated continuously for most applications.
It is driven by a flange-mounted, fractional horsepower motor.
An optional accessory that can be obtained is an automatic sludge
ejector timer control. This timer allows the sludge ejector to operate
for two hours after the RotoClone shuts down. Thus, materials
with slow settling rates can be removed from the unit after
RotoClone operation.
Size
1
1
⁄2
21⁄2
4
6
8
12
16
20
24
28
32
36
40
44
48
Maximum
Operating
Wt. Lbs.
(Note 1)
6,300
6,400
9,500
11,400
13,200
16,500
28,500
33,600
40,300
46,000
51,100
56,300
64,500
70,200
76,100
Normal
Operating
Wt. Lbs.
(Note 2)
4,800
4,900
7,100
8,700
10,500
13,200
21,600
25,300
30,500
34,800
38,500
42,400
49,200
53,500
58,000
Water
Capacity
Gallons
300
300
470
540
530
650
1,370
1,650
1,950
2,220
2,500
2,775
3,050
3,330
3,610
RotoClone
Only
2,000
2,000
2,700
3,600
5,300
6,500
8,000
9,400
11,000
12,400
13,700
14,800
19,300
21,300
23,400
Exhauster
Only
300
400
500
600
800
1,300
2,200
2,200
3,300
4,000
4,000
4,500
4,500
4,500
4,500
Installation Instructions
Read the following instructions completely and carefully.
A.Foundations
Foundations must be true, level and rigid enough to prevent vibration
and to support the weight of the RotoClone with its maximum dust
and water load given below.
Erecting Weights
B.RotoClone Erection
1. Set RotoClone on foundation and adjust base until unit is level.
Place spirit level on the leveling strips welded on two or more sides
of the hopper. Use care in leveling both directions as the operation
of the RotoClone depends on the accuracy of the leveling function.
Note: This level can be checked by filling the unit with water until the level reaches
the entering edge (Figure 1) of the impeller. This entering edge should be level with
the water along its entire length with maximum variation of 1⁄8 " plus or minus. (See
Operating Instructions, Item A-2).
2. For Sizes 11⁄2 thru 6, chevron mist eliminator bundles are shipped
loose for installation at the jobsite. Refer to drawing 1400415 for
Installation Instructions. For Sizes 8 thru 48, the entrainment baffles
are fixed in place as an integral part of the unit and it is not
necessary to make any adjustments (Figure 3).
Table 1—RotoClone weights
Note 1: Weight based on maximum sludge capacity with a sludge
weight of 100 pounds per cubic foot.
Note 2: Weight based on weight of water, 62.4 pounds per
cubic foot.
Clean Air
Side
Intermediate
Sheet
Dirty Air Side
Entering
Edge
Figure 1. Cross section of Type N RotoClone®Impeller.
3
Motor &
Drive
Figure 2. Cutaway section of typical Type N RotoClone Design 2 and 3 size 11⁄2 thru 6.
Clean Air
Discharge
Exhauster
Clean Air
Transition
Water
Eliminators
Dirty Air Inlet
Impellers
Hopper
3. For RotoClone Sizes 11⁄2 thru 6 which are not shipped with
exhausters or for all RotoClone Sizes 8 and larger, three-inch
sealing tape is furnished. This tape seals the 5⁄8 inch nominal gap
between the clean air transition and the exhauster inlet.
4. RotoClones, Sizes 8 thru 48 are shipped disassembled in major
subassemblies; RotoClone, clean air transition, motor, drive, and
exhauster. Necessary gasket material for the flange between the
RotoClone and transition section and the three-inch sealing tape
noted above are packed in a box with bolts.
5. If necessary, Sizes 16 thru 48 can be shipped with the collecting
section and hopper section disconnected.
Field assembly of collecting section and hopper section will require
the following:
a. Install gaskets on top of hopper external flange.
b. Set collecting section in place so its bolting flange matches
hopper flange. Lower carefully, watching for interference between
intermediate sheets (lower section of curved entrainment baffles)
and impellers. Walls of interior center section, formed by the two
intermediate sheets must be inside impeller bolting surface
(Figures 1 and 3).
c. Bolt outside flanges of collecting section and hopper section.
d. Bolt impellers to intermediate sheets. Before tightening, entering
edge (Figure 1) of impellers must be in a straight line. Impellers
were installed in the hopper section and aligned at the
factory. Each impeller section is matched-drilled with holes in
intermediate sheet. Pull these bolts tight and check alignment
before tightening remainder of bolts through slotted holes in
impellers and drilled holes in intermediate sheets.
4
Figure 3. Cutaway section of typical Type N RotoClone
with Design “L2” Ejector and Design 4 and 5.
Sizes 16 through 48.
Fan Outlet
Clean Air Transition
Entrainment Baffles
Collecting Section
Impeller
Hopper
Lower Ejector
Shafts Mounted
Internally
RotoClone Inlet
Upper Ejector Shaft
Paddle Scraper
Design “L” Sludge Ejector
C.Lubrication
1. All bearings on the sludge ejector are ball bearings packed with
grease before leaving the factory. Do not add grease during
installation. See Maintenance Instructions, A-4 for greasing
instructions and schedules.
2. Gear reducer on sludge ejector drive was filled with oil before
shipment. Check for proper oil level. See Maintenance
Instructions, A-4.
NOTE: To prevent loss of oil while units are in transport, the
reducers are shipped with a brass pin in vent or filler plug. This
pin must be removed before the reducer is operated.
D.Duct Connections
In order to prevent surging within the RotoClone, four to five duct
diameters length of straight run prior to the inlet will provide uniform
distribution at the inlet. If an elbow is required due to space limitations,
turning vanes must be used in the elbow to evenly distribute the air
and prevent surging.
Inlet and exhaust duct must be supported from floor, wall or ceiling;
not from RotoClone or exhauster. Depending on the application and
local conditions, the discharge from the exhauster may be returned to
the workroom or discharged to the atmosphere. It may be desirable
to have both outside and inside discharges fitted with a selective
damper. This will save heat during the winter with recirculation and aid
ventilation by discharging outside during the summer months. Where
discharge duct is required, it should extend above adjacent roof lines
and should discharge vertically upward. As long as there is a drain in
the fan housing, a raincap or weather hood need not be used. Crosssection of the discharge duct should not be less than the exhauster
outlet area.
E. Water Supply Connection
Connect a 1" line for Size 1
1
⁄2 thru 6 or a 2" line for Sizes 8 and larger
at point shown on Figure 4.
5
Figure 4. Typical Type N RotoClone with Design “W2” Ejector.
Sizes 1
1
⁄2 through 12.
F. Drain Connection
Connect a 2" drain line for Sizes 11⁄2 thru 12 or a 4" drain line for
Sizes 16 and larger at point shown on Figure 4.
G.Fan Drain
When fans are mounted on the RotoClone, a drain pipe from the fan
drain should be installed back down through the top of the RotoClone
(a hole is supplied in the top of the RotoClone). An “oversized washer”
should be slipped over the drain pipe and caulked to the RotoClone
roof to close off the annulus formed by the drain pipe and hole in the
roof of the RotoClone.
H.Electrical Connections
Electrical components of the RotoClone are the exhauster motor,
sludge ejector motor, motor starters, solenoid valve, and flow switch.
Each connection is to be made in accordance with the appropriate
wiring schematic enclosed with the RotoClone instruction packet.
1. Exhauster motor—The motor nameplate will show the connection
hookup of the motor leads.
CAUTION: After connecting motor leads, insure that the exhauster
rotates in the proper direction as indicated by the arrow on
exhauster housing.
Fan Outlet
Clean Air Transition
Fill Valve
Water Supply
Connection
Collecting Section
Leveling Strip
Hopper Section
Water Level
Control Box
RotoClone
Drain Valve
Lower Ejector
Shaft Mounted
Internally
Access Doors
RotoClone Inlet
Design “W”
Sludge Ejector
Paddle Scraper
Take Up Bearings
Standing Level
Overflow Drain
Drain Connection
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