Clarus ZF-450 Manual del usuario - Página 10
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RECIRCULATION FLOW ADJUSTMENT
The recirculation flow is designed to be 1.2-1.8 times
that of the average design inflow. Table 4 indicates
starting flow rates for each unit. However, fine
adjustments may be necessary to ensure optimum
performance.
Setting the flow rate:
• Adjust the flow using rates in Table 4.
• The flow rate is adjusted by rotating the gray
recirculation valve (2) and observing the flow at the
pipe end.
• There are prescribed lines at the outlet of the
recirculation pipe to aid in approximating the correct
flow.
Measuring the flow rate:
• The actual flow rates must be measured to verify
flow after adjustment of the valve and observation
at the pipe end.
• Measure the time in seconds required to fill a 1L
container.
• Compare the time to value ranges in Table 4.
• If necessary, adjust the valve again and collect
another sample to verify the correct flow rates.
It is important not to set the flow rate too high
because it can cause excessive agitation within the first chamber
(Sedimentation Chamber). This could result in poor performance.
Table 4
- Recirculation Flow Rates
Model
Recirculating flow rate (sec/liter)
Suggested Valve Opening
Figure 14
- Flow
Measurement
RECIRCULATION OR BACKWASH PIPE
CONTAINER
FAUCET
BACKFLOW PREVENTER
BLOWER
ZF450
ZF800
29-45
14-22
35-40%
30-35%
RECIRCULATION OR BACKWASH PIPE
CONTAINER
HOSE
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10
CLAMP
BRUSH
G.L
BACKWASH FLOW ADJUSTMENT
In order to prevent plugging of the media in the
aeration chamber, the backwash cycle activates
at a preset schedule. If there is no backwash cycle
or if the backwash cycle is too short, the unit's
performance will be adversely affected. Likewise, if
the backwash cycle is too long, performance will be
compromised.
The backwash cycle begins at 2:00 AM and lasts for
five minutes. One hour later, another five minute
backwash cycle occurs. The backwash initiation
time can be set for any time during a 24-hour period
to accommodate unusual water use patterns. The
goal is to set the time when there is no flow into the
unit.
The backwash cycle and sludge transfer from the
aeration chamber takes place in the same action.
Verify that the air flow is uniform across the
aeration chamber during a backwash cycle. If not,
adjust the red backwash valve (3) accordingly.
Setting the flow rate:
•
On all HIBLOW HP series model blowers, press
the [MINUTE] button for at least 2 seconds to
switch to manual mode. The "aeration" and
"backwash" can be switched by the [MINUTE]
button.
•
Set the backwash flow rate by adjusting the
gray sludge transfer valve (4). Use Table 5 to
determine the setting for each Fusion
Measuring the flow rate:
•
Measure the actual backwash flow rate at the
outlet of the sludge return pipe in the first
chamber the same way the recirculation flow rate
is measured.
•
Adjust the gray sludge transfer valve (4) if
necessary to obtain the proper flow.
•
Be sure to press [SET] to return the unit back to auto
mode on HIBLOW Unit.
Table 5
- Backwash Flow Rate Setting
Model
Frequency
Backwash flow
Twice/day
rate (sec/liter)
Valve open (%)
Twice/day
Figure 15
- Flow
Controlling Valve
model.
®
ZF450
ZF800
7-10
4-6
50-55%
40-45%