8
Electrical Connections / Controls
1. Each
TowerGuard
requires a single point electrical connection to the pump motor starter box. See the Electrical Sche-
matics in the Engineering Drawings section. See the system product specification or system identification label for the
electrical requirements.
2. Insure the correct voltage and amperage is supplied to your system. Customer Power Supply should include a local
disconnect that is fused or uses a circuit breaker sized to provide appropriate protection to the TowerGuard Filter Sys-
tem. Follow all local code requirements and NEC standards when installing field wiring. A Phase Sequence Indicator
and Motor Rotation Tester should be used to determine the correct wiring for pump rotation. Also, see Initial Start Up
Procedure, steps #9 & #10, on page 9.
3. The
TowerGuard
backflush is monitored and actuated by a
MAXIM
Controller. See the section on the
MAXIM
opera-
tion for a complete explanation of the controller functions and connections.
Replacing the Sand Media and/or under drains
1. While disassembly of the filter is unlikely to be required the following is relevant.
2. Ensure that the pump and water supply are turned off and all valves are in the off position.
3. Removal of the filter media can be done with the use of a slurry pump which will suck out the fluidized media. Remove
the top manhole cover and ensure that there is sufficient water to fluidized the filter media so the slurry pump can be
used, taking care not to break laterals while the last portion of media is being removed.
4. If a slurry pump is unavailable, open bottom drain, remove as much sand media as possible by hand, then flush re-
mainder of the media out by adding water to the inside of the filtration unit.
5. The under drain stem and manifold can be replaced while in the filter. Under drain laterals unscrew from the manifold in
sections to allow for removal and replacement.
Loading the Sand Media
The recommended sand is .45 to .55mm and meets the AWWA B100 requirement.
1. Before filling the filter media into the vessel, do a visual check of the laterals. Look for broken or loose laterals. Re-
place if necessary.
2. To eliminate stress on the laterals, fill the filter vessel with enough water to provide a cushioning effect when the sand
is poured in.
3. For TGSS-20 and TGSS-24 inch Sand Filter models, Remove the top diffuser from the internal diffuser pipe and place
the flexible air relief tube to the side and out of the way, inside the filter vessel. Cap the internal diffuser pipe with the
sand shield that is provided to prevent sand from entering the pipe. DO NOT MOVE THE DIFFUSER PIPE, as this
can affect the integrity of the bulkhead seal.
NOTE - The above instructions do not apply to the TGSS-30 inch Sand Filter models. Any filter media
entering the diffusers will be removed during normal filter operation.
4. Wash all of the filter media and debris away from the threads of the filter vessel top cap area.
5. Thread the Top Cap onto the filter tank. Hand tighten only - do NOT use excessive force.
Approximate.
Fill Level
Sand Media
TGSS-20C - 200 lbs.
TGSS-24C - 310 lbs.
TGSS-30C - 460 lbs.
Figure 2.
