n. Reconditioning Cycle Length Adjustment.
ELECTRICAL HIGH VOLTAGE
Electrical high voltage can cause serious injury or death. Some
tests performed in testing require power to be connected. Always
take proper measures to ensure personal safety.
Depress latch (2) figure 3-18, sheet 1 of 2) and remove timer mechanism (17) from timer case (1).
Loosen setscrew (33), but do not remove.
Position black cam (28) to read 0 minutes.
Position second cam (30) the desired minutes away from 0 minutes.
Position brine refill dial (5) (figure 320, sheet 2 of 2) to desired time for second backwash cycle.
Position third cam (30) (figure 31 8, sheet 1 of 2) to desired time for the OFF cycle.
Position fourth cam (31) to desired time for purge cycle.
Tighten cam setscrew (33) when all adjustments have been made.
Rotate extra reconditioning knob (7) (figure 320, sheet 2 of 2) to IDLE position.
Position pilot valve controller cam (1) (figure 320, sheet 1 of 2) to the service (SR) position.
Install timer mechanism (8) (figure 320, sheet 2 of 2) in case.
Run tests required to assure proper adjustments have been made.
3-21. BACKWASH TIMER (SOLID STATE).
a. General. The backwash timer automatically starts and ends the different stages of the backwash cycle of
the multimedia filter. Each stage of the cycle time can be adjusted to suit a wide range of water types and
operating conditions. This paragraph describes the disassembly, cleaning, inspection, repair, and reassembly of
the solid state timer. Refer to (figure 321 ) for schematic.
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