40
Donaldson Company, Inc. © 1995
* ∆P = Pressure Drop across filter elements
in inches water gage.
NOTE
• Do not increase compressed air
pressure beyond 100 psig as
component damage may result.
• Do not increase or decrease the pulse
ON TIME on the solid state timer.
Longer or shorter pulse ON times do
not aid in cleaning of filter elements,
they just waste compressed air and
cause shortened filter element life.
5.0 OPERATING ADJUSTMENTS
Compressed air is recommended to be set at
90 psig. The control is factory set to clean one
filter element every ten seconds.
5.1 Checker Board
Refer to the Start-up Procedure in the
Installation and Operations Manual for the
Checker board diagnostic and control panel
(IOM-72202-00) and follow this procedure for
any operating adjustments that may be
necessary.
5.2 Solid-State Control Timer
The optional solid-state control timer is also set
to clean one filter element every ten seconds.
Either the Magnehelic or Photohelic gage can be
used with the solid-state timer.
If the filter elements are operating at a higher
than design
∆P*, it may be lowered by
increasing the frequency of cleaning. The
minimum off time (elapsed time), between pulses
is 1-1.5 seconds. Additional cleaning energy may
be obtained by adjusting the pressure upward to
a maximum of 100 psig.
Pulse ON TIME can be checked or adjusted by
consulting your local Torit representative.
If operating at a low
∆P, you may want to raise
to a higher pressure drop by increasing the OFF
TIME between pulses on the solid state timer
board. This will greatly reduce your compressed
air consumption. Use of the optional pressure
switch control (Photohelic gage) is an alternative
to provide compressed air savings. This controls
the solid-state timer board to only pulse at the
desired high and low ∆P* set needle. The pulse
cycle starts when the filter elements obtain that
set point and continues the pulse cycle until the
low ∆P set point is reached, at which time the
pulse cycle stops. This method of using the
Photohelic gage can save additional compressed
air, especially when collecting low levels of
contaminants (low loading).
To Next Page
Loading...