Install Instructions

F76S WATER FILTERS AND MV876B AUTOMATIC-BACKWASH CONTROLS
33-00557—01 4
PLANNING THE INSTALLATION
The F76S should be sized based on the required flow rate
and the resulting pressure drop across the filter. As a
guideline for most applications, the F76S should be sized
to avoid pressure drops exceeding 3 psi.
EXAMPLE
What size F76S is required to provide a flow rate of 30
gpm? Reading across Table 1 at 3 psi pressure drop, a 1
in. filter can provide 31 gpm without exceeding 3 psi
pressure drop.
An increased pressure drop across the filter results when
higher velocities are maintained to increase the capacity
through any given size filter. Severe pressure drops will
be encountered as capacity approaches that of the pipe
size. To ensure the backwash cycle operates properly
and cleaning action is not reduced, follow all
recommendations in Fig. 2. Refer to Fig. 2a for an ideal
installation.
NOTE: All filter installations are different. The size,
type, and amount of dirt and debris and the flow
rate must always be considered when choosing
a screen and deciding to install multiple F76
Water Filters in parallel.
Fig. 2. Installation recommendations.
Fig 2a. Ideal F76S
installation. A funnel
mounted directly under the
backwash port is the best
installation layout.
Fig 2a. Ensure the inlet pipe is not
downsized. Do not use 1/4 or 3/8 inch
tubing on 1/2 or 3/4 inch models.
Fig 2c. Ensure the backwash
outlet pipe is not downsized,
long, or crimped. Instead,
install a short oversized pipe
on the backwash outlet. Do
not use a low capacity
solenoid valve to automate the
backwash cycle.
Fig 2d. Ensure the backwash
outlet is not raised above the
F76S. If the backwash outlet
must be raised above the
F76S, increase inlet pressure
5 psi for every 10 feet that it
is raised.
Fig 2e. Ensure the F76S is not used
with an undersized pump. An
undersized pump may not provide
proper pressure or flow.
Fig 2f. Ensure the F76S is not
installed in a bypass across a
pump.
100
150
50
0
200
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150
50
0
200
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A