SAST0922
Page
14
Injector and Filter Screen Replacement
1. Place the bypass valve into the "bypass"
position.
2. Relieve the system pressure.
3. Remove the three (3) screws from the triangular
cover plate.
4. Lift away the cover plate.
5. Remove the injector from the valve body and
separate the gasket from the injector.
6. Inspect the injector cavities for blockage.
7. Remove the filter screen from the valve body
and inspect the screen for dirt. Replace if
necessary.
8. Follow the steps in reverse to re-install the
injector and filter screen.
Note: Prior to re-installing the injector gasket,
insure that the side marked "OUT" is facing
the injector.
Riser Replacement
1. Place the bypass valve into the "bypass"
position.
2. Relieve the system pressure.
3. Disconnect the unit from the bypass connections.
4. Remove the unit from the resin tank.
5. Turn out the upper distributor basket from the
unit adapter ring.
6. Remove the two (2) adapter hold down screws,
and lift away the adapter ring.
7. Separate riser assembly from valve body.
8. Clean the riser o-rings and wipe out the valve
body cavity.
9. Use the Dow 111 Silicone based lubricant to
lightly lubricate the riser o-rings and the valve
body cavity.
10. Follow these steps in reverse to re-install the
riser assembly.
Check Disc Replacement
1. Place the bypass valve into the "bypass"
position.
2. Relieve system pressure.
3. Remove the four (4) screws from the backcap.
4. Place a hand under the backcap and remove the
backcap. The check disc return spring will fall
into your hand.
5. Remove the check disc from the back of the
body stem assembly.
6. Inspect the rubber seal on the check disc for
wear. Clean or replace if necessary.
7. Re-install the check disc on body stem assembly.
8. Place a small amount of Dow 111 silicone based
lubricant on the back cap centre post.
9. Insure that the back cap gasket is properly
seated in Backcap.
10. Install check disc return spring into centre post.
11. Align the mark on top of the back cap with the
mark on the valve body and carefully direct open
end of return spring into centre post of the check
disc.
12. Install the four (4) back cap screws.
13. Pressurise system and check for leaks.
Body Stem Assembly Replacement
1. Place the bypass valve into the "bypass"
position.
2. Relieve the system pressure.
3. Remove the four (4) head mounting screws.
4. Lift the timer assembly away from the valve
body.
5. Remove the c-clip from the centre of the
diaphragm.
6. Lift the diaphragm away from the body stem
assembly.
7. Remove the seat assembly.
8. Lift out the body stem assembly.
9. Inspect the centre check disc rubber seal for
wear. Clean or replace if necessary.
10. Re-install the body stem assembly.
11. Lightly lubricate the seat assembly o-rings with a
Dow 111 Silicone based lubricant.
12. Re-install the seat assembly, insure that one of
the two (2) flats is facing towards the top of the
valve body.
13. Re-install the main diaphragm and the timer
assembly.
14. It is now necessary to reseat the rear check disc.
Refer to the Check Disc Replacement procedure.
Summary of Contents for SAST0922
Page 11: ...SAST0922 Page 11...
