AAF International Type N RotoClone - Manual (Page 9)

9
This range is appropriate for most dusts except aluminum,
magnesium, and titanium, which oxidize and leave a high hydrogen
ion content. A high H content equals a low pH. This can be kept in the
6–6.5 range with an automatic (solenoid valves on drain and makeup)
purge system which lets in fresh water once each one to four hours.
For each gallon of fresh water, a gallon of low pH water is released.
Be aware that most collected dusts are either inert or biodegradable.
However, dusts which are toxins or heavy metals may not be purged
to the sewage system. Be sure to follow the applicable regulations on
this matter.
J. Flow Control Valve
The Model “SV” and Model “SV” with low water safety switch contain
a flow control valve in the same makeup water controls (see Figure 5
or 6). It will deliver a continuous water flow rate to the water level
control box at a minimum water pressure of 15 psig. Should the flow
rate not maintain the water level due to the amount of materials being
sludged out or high evaporation losses, report to your AAF
representative who can provide a replacement.
K. Sludge Container
A suitable container must be provided under the sludge ejector spout
to catch the continuously ejected sludge. It should be water tight and
arranged for ready removal and easy dumping when filled.
Operating Instructions
A. To Fill RotoClone
1. Be certain Drain Valve in RotoClone (Figure 4) is closed.
2. Open Fill Valve (Figure 4) and add water until it reaches the
standing level overflow drain (Figure 4) connected from side of
ejector chute to drain by a rubber hose.
For Design 3 and 5, no standing overflow can be provided so fill
until water reaches a point 2" below the running level weir in the
control box. This level can be marked on the outside of the control
box pipe. When filling for the first time:
a. First bring water level to entering edge of the impeller (Figure 1)
and check that RotoClone was properly leveled during erection.
(See Item B-1, Installation Instructions).
b. Pour one gallon of water down control box drain pipe to make an
air seal at the bottom of the pipe (Figure 7).
3. Close and tighten control box cover. It must be air tight or incorrect
water level in RotoClone will result.
B. To Start RotoClone
1. Check control box cover and be certain cover is tight.
2. Start ejector motor.
3. Check water supply.
4. Press start button for the RotoClone exhauster. Solenoid valve in
the water supply line should be interlocked to open simultaneously
with fan start-up.
C. To Stop RotoClone
1. Press stop button for RotoClone exhauster. Solenoid valve in the
water supply line should be interlocked to close simultaneously with
fan stoppage.
2. Do not stop ejector for two hours after RotoClone has stopped. If
the automatic sludge ejector timer control is provided, the sludge
ejector will stop automatically at the end of two hours or after the
interval set with the timer.
Maintenance Instructions
A. Routine Maintenance
To insure proper operation of the RotoClone, these procedures should
be followed as a minimum. More frequent cleaning may be required
for certain applications.
1. Water Level Control Box:
a. Observe water in control box frequently. Be certain that water
level is at the running level weir (Figure 7). Observe frequently
through portlight in control top box. DO NOT open portlight when
unit is running because air leakage will alter water level.
b. Open portlight each week while RotoClone is stopped and
remove any accumulations in the box, check air equalizing port
for pluggage, check running level weir, electrode (if supplied),
and drain pipe for build-up and wear (Figure 5 and 6).
Clean cover and secure portlight, carefully tightening
holddowns.
c. Remove strainer in water makeup line after first 24 hours of
service and clean. Clean monthly thereafter.
2. Eliminator Plates (Design 2 and 3):
a. Inspect each week and remove any accumulations. Cleaning
methods will vary with material collected. Hosing in place is
effective for many materials. Removal of plates and scraping or
washing may be necessary. After cleaning install correctly. See
drawing 1400415 supplied with RotoClone.
3. RotoClone Housing:
After one month's operation, drain RotoClone and check for build-
up on any surface. Check all impeller surfaces and hopper walls
carefully and wash down with water hose if required. Frequency of
this operation can be extended until proper cycle for a given
application has been determined.
4. Sludge Ejector:
The two basic types of sludge ejectors are the Type “W2” and the
Type “L2”. The Type “W2” (Figure 9) is used on RotoClone sizes
1
1 ⁄
2
through 12 and has one submerged shaft assembly.
The Type “L2” (Figure 10) is used on RotoClone Sizes 16 thru 48.
It has two submerged shaft assemblies.
a. Chain Tension:
1) Type “W2” ejector (Size 1 1 ⁄
2
thru 12) chains should be
checked weekly. Take up slack in both ejector chains evenly