46
VALVE SERVICE
Rev E
Camshaft
The camshaft has several lobes that push open the valve discs as the
camshaft rotates. Rotation is controlled by a drive motor that drives a gear at
the rear of the camshaft. The front end has a cup with markings and slots.
The outside surface of the cup has an arrow mark. When the arrow is at top
center, the camshaft is in the loading position. 90 degrees clockwise on the
cup an optical sensor is mounted to the top plate. This sensor reads the slots
as they pass through. The largest slot is “Home” and the remaining slots are
positioned to signal the regeneration cycles.
When looking at the end of the camshaft, numbers are visible in the hollow of
the cup. An arrow on the top plate points to the current marking. The numbers
represent regeneration cycles as follows:
C0 =Treated water-normal operation mode
C1 = Backwash
C2 = Regenerant draw (not used in filter mode)
C3 = Slow rinse (not used in filter mode)
C4 = System pause
C5 = Fast rinse cycle 1
C6 = Backwash cycle 2 (not used in filter mode)
C7 = Fast rinse cycle 2 (not used in filter mode)
C8 = Regenerant refill (not used in filter mode)
These numbers are offset rotationally 90 degrees from the matching slot. The
offset enables the service person to view the number at the top of the cup and
determine which slot is at the optical sensor.
To remove camshaft:
1. Disconnect power to the unit.
2. Remove cover.
3. Remove motor.
4. Camshaft should be in the treated water position. Rotate
counterclockwise as needed.
5. Use a screwdriver to hold open the #1 valve disc.
WARNING:
The camshaft slots are molded to exact dimensions. Do not
attempt to modify the cam cup slots. Improper regen will occur!
Slots
Lobes
Cup
NOTE:
If any part of the camshaft is broken or damaged the camshaft
should be replaced. Do not repair or modify damaged cam lobes, gears or
timing cup.