6
Disconnect the flexible conduit,
power and sensor cords from the
control panel. Pull the pump cord
down through the pipe coupling
while holding the cord on the
underside of the basin cover so the
cords do not fall into the basin. For
reinstalling the pump, reverse the
above procedure.
Removing Float Controls
for Replacement:
To remove a float for replacement
from a standard installation
(control panel mounted on basin
cover), the power is first turned off
to the control panel. Disconnect
the float leads from the terminals
in the control panel. Disconnect the
flexible conduit from the control
panel. Remove the flexible conduit
and the float control leads from the
control panel. Pull the pump cord
through the pipe coupling while
holding the cords on the underside
of the basin cover so the cords do
not fall into the basin. Remove
flexible conduit from potting
head. Break out potting from the
potting head and remove the float
wire. Remove float cord from
float cord mounting bracket and
remove float from basin. Replace
3900 float by reversing removal
procedure. Repot the leads in
the potting head according to
N.E.C.and/or local codes.
For the removal of the pumps
and float controls from system
with the control panel mounted
remote from the basin cover,
see the Pump Installation and
Service Manual.
WARNING: Before handling
these pumps and controls, always
disconnect the power first. Do
not smoke or use sparkable
electrical devices or flames in
a septic (gaseous) or possible
septic basin.
Pump
Troubleshooting
The following is a list of common
problems and possible solutions.
Refer to Pump Installation and
Service Manual for any necessary
adjusting, dismantling or repair
work required on the pump.
For Control Panel troubleshooting
chart, refer to the Control
Panel Installation and Service
Manual Q-701.
Pump runs but does not pump
down the basin with the selector
switch on either Hand or
Automatic position.
1. Impeller may be clogged.
Amperage higher than name
plate will indicate this.
2. Pump rotation may be wrong.
Reversing any two line leads
on three phase pumps will
reverse the rotation.
3. Discharge plug valve may
be closed.
4. Plugging anywhere from
impeller to sealing flange. This
is evident if no water runs
out of sealing flange after
raising the pump. Pull the
pump from the basin to find
the clog.
5. Plugging beyond the sealing
flange. This is evident if water
does run out when pump is
operating when disconnecting
the sealing flange from the
discharge elbow. Remove the
check valve, clean out cover
and plug valve and other
piping, if necessary, inside
valve box to find clog.
Reassemble all valves and
piping. If the basin is still
not pumped down after the
pump is lowered again and the
sealing flange is reconnected,
proceed in a logical manner to
locate and clear the plugging.
6. Discharge head may be too
high. Check elevation against
design point of pump.
7. Improper discharge flow.
Check for correct impeller
size and proper voltage.
8. Check for possible broken or
clogged forced main.
Basin level is pumped down
with selector switch on Hand
position, but is not pumped
down with selector switch on
Automatic position.
1. Floats are not hanging free in
the basin or are covered with
debris. Pump the level down
with the selector switch on
Hand, so that the floats can be
observed. Relocate and clean
all floats as necessary.
2. If this is a new installation and
original start-up, the floats may
be miswired into the control
panel. Recheck the wiring
diagrams and schematics in
the panel. If the start and stop
floats are hooked in reverse,
the pump will short cycle on
and off and will not pump the
level down.
3. Floats or alternator are
malfunctioning. Pull the floats
out of the basin, clean them
and lay them on the ground.
Lift up the stop (lower) float in
the left hand, the start (upper)
float in the right hand and with
the bulbs hanging free, turn
selector switch to Automatic.
Lower the left hand until the float
hits the ground and lies on its
side. Nothing should happen.
After lowering the right hand
in the same manner, the pump
should start. When raising the
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