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7.
Inspect the power cable entrance in the side of the clarification riser. Remove any sharp edges or flash. Insert the free
end of the power cable through the shorter segment of a pre-formed ½" conduit ell (2' by 1'), then into the power cable
entrance of the clarification riser. Guide the power cable into the riser. Pull enough cable through the riser to reach 36"
above the riser top. Coil and secure the cable in the clarification riser so that it will not hang down into the tank.
8.
Lay the conduit ell with cable directly across the top and down the tank side. Do not allow the power cable to be laid
across the end of the tank or any removable access cover. Seal the connection between the conduit and the clarification
riser with mortar or approved sealant.
9.
Two alarm leads must be installed from the air pump pressure switches to the Service Pro control center. The pressure
switches should be wired in series as shown in Figure 9 to allow the activation of either pressure switch to activate the
auxiliary alarm. The alarm leads should be #16 AWG minimum and installed in conduit where contact with concrete
may occur. IMPORTANT: Alarm leads and power leads must always be installed in separate conduits.
10. Two alarm leads must be installed from the high water float switch to the Service Pro control center. The alarm leads
should be #16 AWG minimum and installed in conduit where contact with concrete may occur. IMPORTANT: Alarm
leads and power leads must always be installed in separate conduits. If the air pump will be installed in the aeration
riser, the high water and air pump alarm leads should be installed in the same conduit. Properly seal the conduit
opening in the riser with mortar or approved sealant.
11. Check the excavation and sewer line trenches to be sure they are free of debris, rocks and any sharp or abrasive
objects that could damage electrical cables or alarm leads during backfill or settling.
12. Uncoil the electrical service cables and alarm leads into the excavation and influent sewer line trench. Leave sufficient
slack in the cables so they will not be stressed or pulled tight during backfill or settling.
13. Always encase the electrical cables and alarm leads in conduit any time they are above finished grade. Route the
conduits and cables as directly as possible to the control center mounting location.
Required Prior to Backfilling
1.
For installations where the air pumps will not be located in the aeration risers, install a ¾" Schedule 40 PVC air lines
from the air pumps to the system. The air lines should be buried in a trench at a recommended depth of at least 12
inches. Protect the air lines in a casing pipe if heavy loading is anticipated. The air lines must be run into the aeration
risers and the openings in the riser sealed with mortar or approved sealant.
2.
On the Bio-Film Reactor elements, use the universal tool to insure each of the slide locks are rotated until they are in
the furthest extension point possible.
Backfilling
1.
The system should be backfilled immediately after sewer lines and underground electrical cables are installed. Fine,
loose earth should be used to backfill the tank excavation and sewer line trenches. Be sure it is completely free of
rocks, large clumps of earth and construction debris. Use fine granular material when backfilling around electrical
cables and conduits. The underground electrical cables should have at least two feet of earth cover. If the proposed
finished grade will not permit this coverage, the cables should be installed in approved conduit from the tank to the
building foundation. Backfill evenly around the entire perimeter of the tank rather than all at once on each side. Take
care to completely fill in the cavity beneath the hopper at the bottom of the clarifier end wall.
2.
Final grading should be 6" below the top of each access cover and should slope away from the tank so surface runoff
will drain away from the treatment system. Use extreme care in backfilling. Do not allow dirt or mud to enter any part
of the treatment system or sewer lines. If dirt or mud enters any portion of the system, it must be removed to insure
proper system operation. Removing the dirt or mud may require repeated flushing and tank pumping.
3.
Immediately after backfilling, fill each chamber of the treatment system with water to the outlet invert. The water must
be free of leaves, mud, grit or any other materials that might interfere with system operation.
Air Pump and Piping Installation
1.
Remove the bundle of components labeled "AIR". Attach the smaller diffuser bar A6 to the first subassembly A2 at
union as shown in Figure 4. Attach the longer diffuser bar A1 to the second subassembly A2 at union as shown in
Figure 4. Securely tighten unions by hand.
2.
Solvent each weld subassembly A2 to a subassembly A3 as shown in Figure 4. Insure red arrows are aligned.
3.
Solvent each weld subassembly A3 to a subassembly A4 as shown in Figure 4. Insure blue arrows are aligned.
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