Pentair Fleck 4650 Service Manual page 8

SERVICE INSTRUCTIONS continued
C. TO REPLACE PISTON ASSEMBLY
1. Unplug electrical cord from outlet.
2. Turn off water supply to conditioner:
a. If the conditioner installation has a "three valve"
bypass system, first open the valve in the bypass
line, then close the valves at the conditioner inlet
and outlet.
b. If the conditioner has an integral bypass valve, put
it in the bypass position.
c. If there is only a shut-off valve near the conditioner
inlet, close it.
3. Relieve water pressure in the conditioner by putting the
control in the backwash position momentarily. Return
the control to the service position.
4. Remove the control valve back cover.
5. Remove screw and washer at drive yoke. Remove
timer mounting screws. The entire timer assembly will
now lift off easily. Remove end plug retainer plate.
6. Pull upward on end of piston yoke until assembly is out
of valve.
7. Inspect the inside of the valve to make sure that all
spacers and seals are in place, and that there is no
foreign matter that would interfere with the valve
operation.
8. Take new piston assembly as furnished and push
piston into valve by means of the end plug. Twist yoke
carefully in a clockwise direction to properly align it with
drive gear. Replace end plug retainer plate.
9. Place timer on top of valve. Be sure drive pin on main
gear engages slot in drive yoke. Rotate control knob if
necessary.
10. Replace timer mounting screws. Replace screw and
washer at drive yoke.
11. Return bypass or inlet valving to normal service
position. Water pressure should now be applied to the
conditioner, and any bypass line shut off.
12. Plug electrical cord into outlet.
13. Set time of day. Cycle the control valve manually to
ensure proper function. Make sure the control valve is
returned to the service position.
14. Replace the control valve back cover. Be sure
grommet at cable hole is in place.
15. Make sure there is enough brine in the brine tank.
16. Rotate program wheel counterclockwise until it stops at
regeneration position.
17. Start regeneration cycle manually if water is hard.
8 • AP10 Fleck 4650
D. TO REPLACE SEALS AND SPACERS
1. Unplug electrical cord from outlet.
2. Turn off water supply to conditioner:
a. If the conditioner installation has a "three valve"
bypass system, first open the valve in the bypass
line, then close the valves at the conditioner inlet
and outlet.
b. If the conditioner has an integral bypass valve, put
it in the bypass position.
c. If there is only a shut-off valve near the conditioner
inlet, close it.
3. Relieve water pressure in the conditioner by putting the
control in the backwash position momentarily. Return
the control to the service position.
4. Remove the control valve back cover.
5. Remove screw and washer at drive yoke. Remove
timer mounting screws. The entire timer assembly will
now lift off easily. Remove end plug retainer plate.
6. Pull upward on end of piston rod yoke until assembly
is out of valve. Remove and replace seats and spacers
with fingers.