Honeywell MV876B1018 F76S - Manual (Page 6)

F76S WATER FILTERS AND MV876B AUTOMATIC-BACKWASH CONTROLS
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Fig. 5. Installing the MV876.
Fig. 6. Final position of MV876 and F76S components.
Installation on an F76A
1. Close the water supply valve to shut off water supply.
2. Drain all water from the F76A by opening both a fixture
downstream, and the backwash outlet; loosen the air
vent on top of the F76A.
3. Remove the backwash outlet (see Fig. 7):
a. Grip the F76A fixture with a wrench.
b. Using another wrench, turn the outlet
counterclockwise (viewed from the bottom).
4. Connect the MV876 to the F76A (see Fig. 7):
a. Ensure a plastic washer is placed between the filter
sump and the backwash outlet.
b. Connect the externally threaded portion of the
MV876 backwash outlet to the internally threaded
F76A connection.
5. Connect the hose fitting to the MV876 backwash outlet
(see Fig. 7).
Fig. 7. Installing the MV876B on the F76A.
Set Pressure Gauge Needles
The black needle on the pressure gauge measures the F76S
outlet pressure. When the F76S is running with clean screens,
there is a small pressure drop across the F76S (3 psi at
maximum recommended flow).
The red needle is a stationary needle that helps monitor back-
wash interval.
NOTE: The following assumes a constant inlet pressure. If
inlet pressure is variable, another gauge on the inlet
piping, or the air vent will provide more information
regarding actual pressure differential.
1. Backwash F76S once to ensure the screens are clean.
2. With the F76S in operation, rotate the clear gauge cover
to set the red needle to match the black needle.
M16481
MV876B
M16483
MV876B
M17357