Clarus Environmental Fusion Series Treatment Systems 2800/3200/3600/4000 - Manual (Page 11)

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In order to prevent plugging in the Aeration Chamber, the backwash
cycle activates at a preset schedule. If there is no backwash cycle or
too short of a backwash cycle, 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. Even with these
default settings, the waste water inflow could be too low or too high to
optimize the performance and therefore, must be checked during each
inspection.
The backwash cycle and sludge transfer from the Aeration chamber
take place at the same time. Verify that the air flow is uniform across
the Aeration chamber between the two sides during a backwash
cycle. If not, adjust the red backwash valve (3) accordingly.
The recirculation flow is designed to be 1.2-1.8 times that of the average
inflow. Table 4 indicates approximate 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 1000 mL 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.
Setting the flow rate:
• Switch to a manual backwash cycle by pressing the pink "Manual
Backwash" button on the switching valve control pad.
• Set the backwash flow rate by adjusting the gray sludge transfer
valve (4). Use Table 5 to determine the typical setting for each
Fusion ® model.
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.
• Return the switching valve to normal aeration mode by pressing the
pink button on the switching valve's control pad.
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.
RECIRCULATION FLOW ADJUSTMENT BACKWASH FLOW ADJUSTMENT
Reset (factory default settings):
1. Press Reset.
Clock is set to 0.00 (midnight).
Backwash Time is set to 2:00 AM.
Backwash Frequency is set to 2 per
day. Backwash Duration is set to 5 mins.
To Adjust Clock & Backwash Settings:
1. Press Mode SW. Note the blinking arrow indicating (hr.) under "Clock"
at the right of the screen.
2. Press Set SW to select the current hour of the day.
3. Press Mode SW. Note the blinking arrow indicating (min.) under
"Clock" at the right of the screen.
4. Press Set SW to select the current minute of the hour.
5. Press Mode SW. Note the blinking arrow indicating Time (hr.) under
"AUTO Back Wash" at the left of the screen.
6. Press Set SW to select the hour that the system will begin to back
wash. (A setting of 2 is standard)
7. Press Mode SW. Note the blinking arrow indicating Freq./Day under
"AUTO Back Wash" at the left of the screen.
8. Press Set SW to select either 1 or 2 back wash cycles that the system
will perform per day. A setting of 2 is standard.
9. Press Mode SW. Note the blinking arrow indicating Duration (min)
under "AUTO Back Wash" at the left of the screen.
10. Press Set SW to select either 5 or 10 minute duration for back wash
cycle. A 5-minute cycle is standard.
NOTE: A 24-hour clock is used in place of AM/PM designations.
Figure 16
SWITCHING VALVE TIMER SETTING