Pump Troubleshooting - Pentair HYDROMATIC S4L Installation And Service Manual

IMPORTANT: Do not use
any of the old seal parts.
Replace with all new seals.
11. Thoroughly clean all castings
before replacing seals. One
grain of dirt between the seal
faces can cause failure.
12. Examine all O-rings for nicks
before using.
13. Use Locktite on socket head
®
locking screw in end of shaft.
14. Before refilling chamber with
oil, air test as described above
and refill both chambers with
oil.
15. Always check all leads with
high voltage or with Megger
for grounds before operating
the pump.
Replacing Cords:
The power cord and heat sensor -
seal failure cord is potted into the
con nec tion box cap, forming the
cord and cap assembly.
If cords require replacement due to
damage or cords being too short,
cord and cap assembly must be
replaced as a complete assembly
avail able from factory.
Check pump for proper rotation
before re turn ing to normal service.
Disconnecting Pump Cords:
If a Hydromatic hazardous location
pump is to be removed from its
loca tion, the pump cords may be
disconnected at control panel (on
sump mounted con trol panels) and
cord as sem bly taken with pump.
CAUTION: If cord openings
from sump to con trol panel are
open, gas es from sump could
enter panel and an explosive
condition could ex ist.
Replacing Lower Seal, Impeller
or Volute:
The wet end components may be
repaired or replaced by an authorized
Hydromatic service facility without
compromising the
location rating to the pump.
NOTE: Any time the seal is
disturbed, it must be replaced.
Pump
Troubleshooting
The following is a list of common
problems and their probable causes.
Pump will not start.
1. No
Check for blown fuse or open
circuit breaker.
2. Selector switch may be in the
Off position.
3. Control circuit transformer fuse
may be blown.
4. Overload heater on starter may
be tripped. Push to reset.
Pump will not start and
overload heaters trip.
1. Turn off power and check
motor leads with Megger or
ohmmeter for possible ground.
2. Check resistance of motor
windings. All 3 phases should
show the same reading.
3. If no grounds exist and the
motor windings check OK,
remove pump from sump
and check for clogged or
blocked impeller.
Pump operates with selector
switch in Hand position but will
not operate in Auto position.
1. This
the float level control or the
alternator relay.
2. Check control panel for trouble.
Pump runs but will not shut off.
1. Pump may be air locked.
Turn pump off and let set for
several minutes, then restart.
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
hazardous
Hand position.
power to the motor.
indicates trouble
Pump does not deliver proper
capacity.
1. Discharge gate valve may
be partially
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
in
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.
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.
closed or
7