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F76S WATER FILTERS AND MV876B AUTOMATIC-BACKWASH CONTROLS
62-3015—44
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.
100
150
50
0
200
Honeywell
Braukmann
M16488
Fig. 2a. Ideal F76S installation. A funnel
mounted directly under the backwash
port is the best installation layout.
Fig. 2b. 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.
100
150
50
0
200
Honeywell
Braukmann
M16489
100
150
50
0
200
Honeywell
Braukma
nn
M16490
100
150
50
0
200
Honeywell
Braukmann
M16491
100
150
50
0
200
Honeywell
Braukmann
M16492
M16478
100
150
50
0
200
Honeywell
Braukmann
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.