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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 15
TIMER SWITCHING VALVE
