Calibrating Float Switches - Pentair PR AQUA ROTOFILTER Installation And Operation Manual

SECTION 7: PRE-OPERATION

7.11 Calibrating Float Switches

Float switches are mounted on a bracket installed
above the inlet channel. Switches trigger functions,
such as drum rotation and backwash cycle or
a high-level alarm, when the float reaches a
certain elevation.
The float switch may need to be calibrated after
installation or if a change in flow or TSS occurs.
Figure 20. Float switch assembly
1: Backwash and Drum Rotation Switch
2: High-Level Alarm Switch
3: Float Switch Support Fastener
4: Overflow Bypass
Floats are factory adjusted to default settings.
The backwash and drum rotation float is set at 5
centimeters (2 inches) below the overflow bypass,
meaning the backwash cycle will commence when
the water level inside the drum is 5 centimeters (2
inches) below the overflow bypass.
The high-level alarm (if included) is 2.5 centimeters
(1.0 inch) below the overflow bypass.
1. Remove the Rotofilter lid.
2. Loosen the fastener(s) supporting the float to
the bracket.
3. Slide the float assembly up or down to the
desired position. Retighten the fastener(s).
If a float needs to be removed for
NOTE
maintenance or replacement, make
a note of the float's orientation.
Most floats have a small "o" symbol on one side
indicating the top. Ensure the float is installed with
the "o" facing up. Mark the top of the float before
removing it if there is no distinguishable mark.
PR Aqua Rotofilter™ Drum Filter Installation and Operation Manual
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