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Fig. 10. Final position of MV876 and F74C.
As the F74C operates, screens become plugged.
Backwash the F74C when the pressure gauge measures
about five psi lower than when first installed. However,
each installation is different. Residential applications can
require backwash only once a week, or once every few
weeks.
For residential applications, backwashing the F74C once
a week, regardless of need, is an excellent guideline to
follow to ensure F74C peak operating efficiency.
Fitting Batteries and Fuses
The batteries (not included) provide power to the MV876
in the event of a power loss. This is desirable, especially
when power loss occurs during the reverse rinsing cycle.
to provide this, the MV876 requires four AA alkaline
batteries. Install these batteries in the cover of the
MV876 as follows:
WARNING
Electrical Shock or Equipment Damage
Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installing the
batteries or fuses.
F74C REVERSE RINSING FILTER; MV876 AUTOMATIC-BACKWASH CONTROLS
Fig. 9. Installing the MV876.
M16483
1. Unscrew the four housing screws and set them
aside. See Figure 11.
IMPORTANT
Make sure the connecting cable is protected
from damage when the MV876 cover is
removed.
2. Remove the MV876 cover. See Fig. 11.
3. Insert four AA alkaline batteries. See Fig. 12.
4. Replace the cover.
5. Replace and tighten the four housing screws.
6. To avoid unnecessary battery drainage, connect
the MV876 to power as soon as possible after
inserting new batteries.
7. To ensure the availability of battery power, replace
the batteries after a power loss.
If the 800 mA fuse blows, replace it as follows:
WARNING
Electrical Shock or Equipment Damage
Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installing the
batteries or fuses.
1. Unscrew the four housing screws and set them
aside (see Fig. 11).
IMPORTANT
make sure that the connecting cable is
protected from damage while the MV876 cover
is removed.
2. Remove the MV876 cover.
3. Remove and discard the old fuse (see Fig. 13).
4. Insert a new 800 mA fuse.
5. Replace the cover.
6. Replace and tighten the four housing screws.
7. Reconnect the power supply.
5
M16481
62-0165
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