8
Electrical Connections / Controls
1. Each
TowerGuard
requires a single point electrical connection to the pump motor starter box. See the Electrical
Schematics 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 System. Follow all local code requirements and NEC standards when installing field wiring. A Phase Se-
quence 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
operation for a complete explanation of the controller functions and connections.
Loading Sand Media
The recommended sand is .45 to .55mm and meets the AWWA B100 requirement.
1. Before filling the vessel with sand media, do a visual check of the laterals. Look for broken or loose laterals.
Replace if necessary.
2. To eliminate stress on the laterals, fill the filter vessel with enough water (Approx.1/3) to provide a cushioning
effect when the sand media is poured in.
3. The filter will require a sand media bed depth, which shall extend to an approximate level below the top of the
hydraulic distribution lenses. See Figure 1
4. For TGSS-20T and TGSS-24T 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 dif-
fuser 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 instruction does not apply to the TGSS-30T inch Sand Filter models. Any sand
media entering the diffusers will be removed during normal filter operation.
5. Wash all of the sand media and debris away from the threads of the filter vessel top cap area.
6. Lubricate the O-ring or gasket (bolt down type) MPV and thread into the filter. The lubricant should be silicone
based and NOT petrochemical / oil based lubes
7. Thread the Top Cap onto the filter tank. Hand tighten only - do NOT use excessive force.
Changing Sand Media
1. Ensure that the Controller, pump, or water supply is turned off and all valves are in the off position.
2. Removal of the sand media can be done with the use of a
slurry pump which will suck out the fluidized me-
dia.
3. Remove the top manhole cover and ensure that there is sufficient water to fluidize the sand media so the slurry
pump can be used taking care not to break the lateral while the last portion of sand media is being removed.
Approximate.
Fill Level
Sand Media
TGSS-20T - 200 lbs.
TGSS-24T - 310 lbs.
TGSS-30T - 460 lbs.
Figure 4.
