Franklin Electric Inline 400 Owner's Manual page 13

Cleaning the Flow Switch:
In some cases the flow switch may become clogged with mineral deposits or plugged with
debris. In those cases the switch may be cleaned by the following steps:
1. Disconnect the unit from incoming power.
2. The system may be under pressure. As such, close both the inlet and outlet valves
and drain all pressurized water from the system prior to performing maintenance on
the flow switch.
3. Remove the (6) Control Cap screws and remove the cap (note: be careful when
removing the control cap as there is an electrical cable attached to the head.)
4. Remove the three Phillips screws that hold the Flow Cap in place.
5. Remove the flow control cap. The o-ring may come off with the cap or may remain
in the head. Remove the o-ring and make sure it is free of debris. Place it back on
the bottom of the flow cap.
6. Use a small metal object, such as a screwdriver or nut driver, to retrieve the
magnetic flow control piston from the cavity. (It is magnetic and will stick to the
metal object)
7. Clean the magnetic flow control piston with a cloth.
8. Clean any debris or residue from the head where the Piston is inserted.
9. Replace the Piston into the head. Press the Flow Cap w/o-ring firmly into the head.
Tighten the (3) screws to 15 inch-lbs torque (do not overtighten)
10. Replace the control cap and tighten (6) screws to 15 inch-lbs torque.
11. Re-calibrate control head (see page 14)
Screws
Inline Pressure Boosting System
Flow Cap
Control Head
Piston
Flow Cap,
Screws,
O-ring
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