Hydromatic S4LRC, Installation And Service Manual, Page: 9 / 16

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2. Lower float control may be
hung-up in the closed position.
Check in sump to be sure control
is free.
3. Selector switch may be in the
Hand position.
Pump does not deliver
proper capacity.
1. Discharge gate valve may be
partially closed or partially
clogged.
2. Check valve may be partially
clogged. Raise level up and
down to clear.
3. Pump may be running in
wrong direction. Low speed
pumps can operate in reverse
direction without much noise
or vibration.
4. Discharge head may be too
high. Check total head with
gauge when pump is operating.
Total head is discharge gauge
pressure converted to feet
plus vertical height from
water level in sump to center
line of pressure gauge in
discharge line. Gauge should
be installed on pump side of
all valves. Multiply gauge
pressure in pounds by 2.31 to
get head in feet.
5. If pump has been in service for
some time and capacity falls
off, remove pump and check
for wear or clogged impeller.
Motor stops and then restarts
after short period but overload
heaters in starter do not trip.
1. This indicates heat sensors in
the motor are tripping due to
excessive heat. Impeller may
be partially clogged giving a
sustained overload but not
high enough to trip overload
heater switch.
2. Motor may be operating out of
liquid due to a failed level
control.
All Hydromatic
S4LRC submersible motors
can operate for extended periods
out of water without burning
up the winding, but the heat
sensors give motor prolonged
life by controlling winding
temperature.
3. Pump may be operating on a
short cycle due to sump being
too small or from water returning
to sump due to a leaking
check valve.