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GENERAL INSTALLATION INSTRUCTIONS
Bio-Dynamic LF Series 4000 tablet feeders can be installed
into any gravity flow water supply or wastewater treatment
system. When used for potable water disinfection, the
feeder is typically installed at grade following final filtration
and just prior to a storage or detention tank. For wastewater
disinfection applications, the tablet feeder is installed
following clarification and prior to or in a chlorine contact
tank. Installation can be in-line, at grade or direct buried.
For dechlorination, feeders can be installed in or immediately
following the chlorine contact tank. When chlorinating and
dechlorinating effluent, two separate Bio-Dynamic tablet
feeders must be installed. Do not mix chlorination and
dechlorination tablets within the same tablet feeder.
FIGURE A
CHAMBER MOUNTING BRACKETS
Integrally molded inlet and outlet hubs allow connection
of the tablet feeder to Schedule 40 PVC piping. Adaptor
couplings should be used, if necessary, to modify piping
diameters and insure a secure piping connection to the
tablet feeder. The effluent line must allow for a 1/8" fall
per linear foot of run along the entire piping run. All tablet
feeders must be installed plumb and level to insure proper
operation. Place a bubble level on the feeder before final
installation to confirm the unit is plumb and level, side to
side and end to end. Always recheck level after installation.
INSTALLATION AT GRADE
LF Series 4000 tablet feeders can be installed in-line at grade
or mounted in the contact tank of a water or wastewater
treatment system. The installation should be accessible
for routine operator maintenance. To mount the unit, use
5/16" diameter corrosion resistant bolts to secure the four
integrally molded mounting feet to the deck of the contact
tank, concrete pad or mounting brackets, as required. For
contact tank installations, use PVC or aluminum mounting
brackets to prevent corrosion (See Figure A).
DIRECT BURIAL INSTALLATION
All models of LF Series 4000 tablet feeders may be installed
below grade without a manhole or secondary enclosure.
Prepare an excavation to the proper depth (See Figure B),
including a sand or fine gravel leveling pad at least 4" thick.
The tablet feeder must be supported by this pad before
inlet and outlet piping is attached to the feeder. Excavated
trenches should be smooth and free of debris to prevent
damage to the pipe. Connecting lines should be laid
continuously and unspliced to undisturbed earth beyond the
limits of the excavation (See Figure C). Schedule 40 PVC,
cast iron or similar materials may be used, subject to the
approval of local codes. Attach the inlet and outlet lines to
the inlet and outlet hubs using ABS compatible glue. A 4"
Schedule 40 PVC pipe with tamper-proof cap (not supplied)
will be used as a riser to grade. Connect the pipe to the riser
hub with compatible glue. Do not cement the cap. Check
the system for plumb and level from side to side, end to end
and vertically along the riser pipe. Backfill the excavation.
Fine, loose fill should be used to backfill the excavation and
plumbing line trenches. Exercise care when backfilling.
Finished grade should be at least 6" below the top of the riser
pipe and should slope away for surface drainage. Confirm
that the feeder is plumb and level.
FIGURE B
DIRECT BURIAL AND REMOTE DIRECT BURIAL
EXISTING SYSTEM RETROFIT
If the existing treatment system piping is in good condition,
the feeder can be fitted directly into the appropriate location.
When installing a tablet feeder into an existing disinfection
system, it is recommended that the chlorine contact tank
be pumped and thoroughly cleaned with a diluted bleach
solution prior to installation of the feeder. Failure to properly
clean the contact tank may result in inadequate disinfection
of the wastewater. It is also necessary to inspect all
upstream and downstream treatment components to
confirm that they are installed and functioning properly.
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