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The regenerant piston (the small diameter one behind the main piston) is removed from the main piston
by pressing straight sideways to unsnap it from its latch. Chemically clean in dilute sodium bisulfite or
vinegar or replace the regenerant piston if needed. To remove the main piston, fully extend the piston
rod by turning the main drive gear counterclockwise, and then unsnap the main piston from its latch by
pressing on the numbered side. Chemically clean in dilute sodium bisulfite or vinegar or replace the
main piston.
Reattach the main piston to the drive cap assembly. Reattach the regenerant piston (if needed) to the
main piston. Do not use Vaseline, oils, other hydrocarbon lubricants or spray silicone anywhere. A
silicone lubricant may be used on black o-rings, but is not necessary. Avoid any type of lubricants,
including silicone, on red or clear lip seals. Reinsert the drive cap assembly and piston into the
spacer stack assembly and hand tighten the drive cap assembly. Continue to tighten the drive cap
assembly using a screwdriver as a ratchet until the drive cap bottoms out. Excessive force can break
the notches molded into the drive back plate. To be sure that the drive cap is fully “home” remove the
drain port fitting and verify that the spacer edge is no longer visible through the drain port. Make certain
that the main drive gear still turns freely. The exact position of the piston is not important as long as the
main drive gear turns freely.
Reattach the drive assembly to the control valve and connect all plugs. After completing any valve
maintenance, press and hold NEXT and REGEN buttons for 3 seconds or unplug power source jack
(black wire) and plug back in. This resets the electronics and establishes the service piston position.
Now reset the time of day.
SPACER STACK ASSEMBLY
To access the spacer stack assembly remove the drive assembly, drive cap assembly and piston. The
spacer stack assembly can be removed easily without tools by using thumb and forefinger. Inspect the
black o-rings and red? or clear lip seals for wear or damage. Replace the entire stack if necessary.
The spacer stack assembly has been 100% tested at the factory to insure proper orientation of one way
seals. Do not disassemble the stack.
The spacer stack assembly may be chemically cleaned (dilute sodium bisulfite or vinegar) or wiped with
a soft cloth.
The spacer stack assembly can be pushed in to the control valve body bore by hand. Since the spacer
stack assembly can be compressed it is easier to use a blunt object (5/8" to 1-1/8" in diameter) to push
the center of the assembly into the control valve body. The assembly is properly seated when at least
four threads are exposed (approximately 5/8"). Do not force the spacer stack assembly in. The control
valve body bore interior can be lubricated with silicone grease to allow for easy insertion of the entire
stack. Do not use silicone or any other type of lubricant on the red or clear lip seals or the
piston?
Reattach the drive cap assembly and piston(s) and the drive assembly.
After completing any valve maintenance, press and hold NEXT and REGEN buttons for 3 sec-
onds or momentarily unplug power source jack (black wire). This resets the electronics and
establishes the service piston position. The display should flash text, software version (e.g.
164), and cycle number before resetting the valve to the service position.
INJECTOR CAP, SCREEN, INJECTOR PLUG AND INJECTOR
Unscrew the injector cap and lift off. Loosen cap with Service Wrench, V3193, or pliers if necessary.
Attached to the injector cap is a screen. Remove the screen and clean if fouled.
The plug and/or injector can be pried out with a small screwdriver. The plug can be wiped clean. If the
plug leaks replace the entire plug. The injector consists of a throat and a nozzle. Replace o-rings.
Chemically clean the injector with vinegar or sodium bisulfite. The holes can be blown out with air. Both
pieces have small diameter holes that control the flow rates of water to insure that the proper concentra-
tion of regenerant is used. Sharp objects, which can score the plastic, should not be used to clean the
injector. Scoring the injector or increasing the diameter of the hole could change the operating param-
eters of the injector.
Summary of Contents for FUSION2 F Series
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