Manual

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 ve minutes. One
hour later, another ve minute backwash cycle occurs. Even with these
default settings, the waste water inow 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 ow 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 ow is designed to be 1.2-1.8 times that of the average
inow. Table 4 indicates approximate ow rates for each unit. However,
ne adjustments may be necessary to ensure optimum performance.
Setting the ow rate:
• Adjust the ow using rates in Table 4.
• The ow rate is adjusted by rotating the gray recirculation valve (2)
and observing the ow at the pipe end.
• There are prescribed lines at the outlet of the recirculation pipe to aid
in approximating the correct ow.
Measuring the ow rate:
• The actual ow rates must be measured to verify ow
after adjustment of the valve and observation at the pipe end.
• Measure the time in seconds required to ll 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 ow rates.
Setting the ow rate:
• Switch to a manual backwash cycle by pressing the pink "Manual
Backwash" button on the switching valve control pad.
• Set the backwash ow rate by adjusting the gray sludge transfer
valve (4). Use Table 5 to determine the typical setting for each
Fusion
®
model.
Measuring the ow rate:
• Measure the actual backwash ow rate at the outlet of the sludge
return pipe in the rst chamber the same way the recirculation ow
rate is measured.
• Adjust the gray sludge transfer valve (4) if necessary to obtain the
proper ow.
• 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