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above pump volute discharge. Pumps should alternate
starting, between each other, upon successive pump-
down cycles. To check override level, set both "H-O-A"
switches to "OFF" position and allow water to surpass
the override level, then set both "H-O-A" switches to
"AUTO" position and both pumps should start. Turn
CHECK LIST IF PUMP DOES NOT OPERATE PROPERLY
Below is a list of common problems and possible solutions.
CONDITION
Pump Runs but Does Not Pump Down the
Basin with the H-O-A Switch on Either Hand or
Automatic Position.
Seal Failure Light Comes On.
off one pump and be sure second pump starts when
override level is reached on second trial. If pumps fail to
cycle in this manner, retrace control float wiring panel.
Step 7: Ensure "H-O-A" switch is set to "AUTO" before
placing system into service.
PROBABLE CAUSE
1. Cutters may be clogged. Amperage higher than
nameplate may indicate this problem.
2. Pump rotation may be reversed (on three-phase
pumps only). Switching any two power leads on three
phase pumps will correct the rotation.
3. Discharge gate valve may be closed.
4. Pump may be air locked. Fill basin approximately 10
inches or more above the ball check valve assembly.
Raise pump assembly so that the ball check valve
disengages the discharge elbow (approximately 6
inches). Stand clear from the sump opening to avoid
spray and turn pump on for a brief second to clear
trapped air in the volute.
5. Clogging anywhere from cutters to check valve. This
is evident if no water discharged out of the check
valve after raising the pump to disconnect the sealing
flange. Pull pump assembly and check for cause of
clogging.
6. Discharge head may be too high. Check elevation
against design point of pump.
7. Clogging beyond the sealing flange. This is evident
if water is discharged through the check valve when
raising the pump to disconnect the sealing flange.
Inspect system basin piping or discharge piping from
basin to locate clogging.
1. This indication means the lower seal has failed and
has allowed water to enter the lower seal chamber
to make contact with the electrode. Pump must
be scheduled for maintenance. Refer to the pump
installation and service manual for information
on replacing the lower seal. NOTE: Use twisted
shielded cable for seal failure cable runs in
excess of 100 feet.
5
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