AS0715-E
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18
15. Re-install the seat assembly, insure that one of
the two (2) flats is facing towards the top of the
valve body.
16. Re-install the main diaphragm and the timer
assembly.
17. It is now necessary to reseat the rear check disc.
Refer to the Check Disc Replacement
procedure.
Backwash Adjustment Valve
Replacement
1. Place the bypass valve into the "bypass"
position.
2. Relieve the system pressure. Remove the four
(4) head mounting screws.
3. Lift the timer assembly away from the valve
body.
4. Remove the c-clip from the centre of the
diaphragm.
5. Lift the diaphragm away from the body stem
assembly.
6. Remove the seat assembly.
7. Disconnect the large c-clip located on top of the
backwash adjustment valve.
8. Press the backwash adjustment valve down and
out through the valve body assembly.
9. Inspect the o-rings on the valve for wear. Clean
or replace the valve assembly if necessary.
10. Lightly lubricate the o-rings with a Dow 111
Silicone based lubricant.
11. Follow these steps in reverse to re-install the
backwash adjustment valve.
Solenoid Assembly Replacement
1. Disconnect all electrical power to the control.
2. Place the bypass valve into the "bypass"
position.
3. Relieve the system pressure.
4. Disconnect the solenoid cable from the solenoid
coil.
5. Remove the one (1) solenoid mounting screw.
6. Lift away the solenoid coil. Test coil and replace
if necessary.
7. Remove the three (3) remaining screws, which
hold down the solenoid plunger retainer.
8. Place a hand under the plunger retainer while
lifting away the retainer assembly.
9. Verify that the plunger moves back and forth
against the return spring without sticking. Clean
or replace if necessary.
10. Separate the solenoid diaphragm from the valve
body. Verify that the diaphragm cavity in the
valve body is free of debris.
11. Inspect the diaphragm for rips or tears. The
diaphragm should have a hole in the centre and
a smaller "pin" hole off centre
12. Follow these steps in reverse to re-install the
backwash adjustment valve.
