9
How to Change the Length of Backwash Cycles:
All cycles have been factory set and should not need adjustment. If local conditions require different
cycle lengths, however, the following procedures should be followed. The end of the program wheel has been
used for backwash cycles to minimize the amount of time that pressure will be applied to the air draw check
valve.
1. Grasp top left corner of timer assembly and pull to swing timer open and expose the program
wheel.
2. Remove program wheel from timer by squeezing retaining lugs in center of program wheel.
Maneuver program wheel away from micro switch arms and timer assembly.
3. RAPID RINSE cycle may be lengthened by adding pins at the end of the program wheel. Each pin
represents 2 minutes of rapid rinse time. The rapid rinse time MUST only be increased by shifting
both the backwash pins and air draw holes an equal number of positions counter-clockwise on the
program wheel.
4. AIR DRAW cycle may be lengthened by increasing the number of holes between the two sets of
pins. Each hole represents 2 minutes of air draw time. The air draw time MUST only be increased
by moving the backwash pins counter-clockwise on the program wheel. Ensure that lengthening
the air draw time does not decrease either the backwash or rapid rinse times.
5. BACKWASH cycle may be lengthened by adding pins in a counter-clockwise direction to first set of
pins on program wheel. Each pin will equal 2 minutes of backwash time. Ensure that adding pins
does not decrease air draw time.
6. Reinstall the program wheel on the retaining lugs by maneuvering past the micro switch arms.
7. Close and latch the timer assembly. Ensure that the retainer snaps into the hole in the backplate
and all electrical wiring is ABOVE the timer post.
FIGURE 5: Back of Timer Assembly
OXY2 Timer Operation (cont.)
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