Maintenance; Manually Cleaning Filter And Winterizing; Cleaning The Filter Using A System With A Separation Tank - Pentair FNS PLUS Installation And User Manual

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MAINTENANCE

Manually Cleaning the Filter
1. Turn the pump off, shut off any automatic controls to ensure that the system is not inadvertently started during
servicing.
2. Automatic skimmer should have trimmer valve set to 100% skimmer. This will close off the main drain line. If there
is a separate skimmer line and main drain line plumbed to the pump, close the main drain valve.
3. Open the FNS Plus Vertical Grid D.E. Filter manual air relief valve, and the waste drain valve or plug if your
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system has one.
4. Remove the pump's hair and lint strainer pot lid and clean the basket. Replace basket and secure lid. Follow the
instructions provided with your pump.
5. Never attempt to assemble, disassemble or adjust the filter clamp while there is pressure in the filter.
Release the tank clamp assembly and remove tank lid. Lift out the complete element for washing. Care should be
taken not to lose or damage the internal air relief, located on top of the manifold.
6. Using your garden hose, thoroughly flush off all contaminated diatomite from the filter element surfaces.
Note: To clean individual grids, see Step 1 of Cleaning the Filter Elements on page 7.
7. After coating the stand-pipe O-ring generously with a silicone base lubricant, replace the element assembly in
the filter tank, seating it firmly in place. Ensure the internal air bleed assembly is in place and free of diatomite or
debris, see Cleaning the Internal Air Bleed Tube on page 8.
8. Ensure the O-ring is in position in the lower tank half. Place and press the filter lid over the lower tank half
sandwiching the O-ring in between.
9. Replace tank top and carefully follow instructions on page 3, Filter Clamp Installation.
10. Reset skimmer Trimmer Valve or main drain line to pump; close waste drain valve or plug, and then follow the
procedure as outlined on page 4, Coating Filter Elements with D.E.

Cleaning the Filter Using a System with a Separation Tank

1. Before working on any part of the circulating system, clamp, pump, filter, valve(s), etc., perform the following steps.
a. Turn the entire pool/spa system off to ensure that the system is not inadvertently started during servicing.
b. Open the High Flow™ Manual Air Relief Valve.
c. Wait until all pressure is relieved. Never attempt to assemble, disassemble or adjust the filter clamp
while there is pressure in the filter.
2. Turn skimmer to full skim position and close main drain line.
3. Remove pump lid and clean basket. Replace basket and secure lid.
4. Valve Procedures.
a. Push-Pull Valve.
(1) Twist to unlock plunger, then raise handle as far as it will go. Turn handle clockwise to lock lower pin in
underside of cap.
(2) Open the manual air relief valve until it snaps into the full open position (this only requires a
quarter turn counter-clockwise). Opening this valve rapidly releases air trapped in the filter.
(3) Stand clear of the filter tank, then start the pump.
(4) Close the manual air relief valve after a steady stream of water appears.
(5) When water flows clear in sight glass or discharge line, shut off pump.
(6) Position the Push-Pull valve to the normal FILTER setting by lowering the handle and twisting it to the
locked position.
(7) Open manual air relief valve on top of separation tank, wait for water to stop draining from Air Relief.
(8) Loosen Separation Tank clamp and lift off Separation Tank lid.
FNS PLUS Vertical Grid D.E. Filter Installation and User' s Guide
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