4
WATER-LOGGED TANKS
CONVENTIONAL TANKS
When a tank system has an inadequate
ratio of air and water, the pump will
start and stop often and erratically.
1. Disconnect electrical power to
pump.
2. Open the lowest faucet in the sys-
tem to release all pressure.
3. Prime the pump.
4. Reconnect power.
As the pump refills the tank, the air vol-
ume control supplies the tank with the
correct air to water ratio. The pump
will then shut off at desired pressure. If
tank water-logs again, examine air vol-
ume control and replace if necessary.
PRE-CHARGED TANKS
If a pre-charged tank becomes water-
logged, the bladder is probably leaking
or broken.
1. Test the tank by depressing the air
valve. The valve will discharge water
if the bladder is broken.
2. If bladder is broken, replace tank.
Once a tank bladder is ruptured, the
tank should be replaced. Repairing the
bladder is not recommended, and may
cause further problems such as: repeat-
ed water-logging, debris in pipes and
clogged discharge in tank.
AIR PRESSURE CHECK FOR PRE-
CHARGED TANKS
Small amounts of air loss is normal in
any tank. To prevent failure and prop-
erly maintain a pre-charged water tank,
check the pressure on a yearly basis.
1. Disconnect power to pump.
2. Open a faucet nearest the tank and
allow all water to drain from the
tank.
3. Measure the tank pre-charge at the
valve stem using a tire gauge.
4. If necessary, adjust the pre-charge
with an air pump: Precharged pres-
sure for the JSU50 pump is
18-20 psi.
5. Prime the pump.
6. Reconnect power.
7. Close faucet.
4. After proper depth is reached,
install a well seal or pitless adapter
to support the pipe.
5. Slope the horizontal pipe upward
toward the pump to eliminate trap-
ping air.
DUG WELL, CISTERN, LAKE AND SPRING
INSTALLATION
1. Install a foot valve on the inlet pipe
and lower into the water.
Locate foot valve
at least 2 feet from
the bottom of the well so sand or sedi-
ment is not drawn into the system.
NOTE:
When a lake is used for the
water supply, make sure the suction
pipe is deep enough to be submerged
at all times. Slope the pipe upward
toward the pump to eliminate trapping
air. The pipe must be removed during
winter months or protected against
freezing.
Protect the pipe
from damage by
swimmers and boaters.
Operation
PRIMING PUMP
Do not run pump
dry. Fill with water
before starting motor. Damage to pump
seals will result and void warranty.
After pump installation is complete, the
pump must be primed.
1. Remove the priming plug.
2. Fill pump and piping completely full
of water.
3. Replace the priming plug.
4. Open faucet to vent system.
5. Start the motor. Water will be
pumped within a few minutes. If
pump does not deliver water within
5 minutes, shut off motor and
return to step 1.
6. Let the system operate for several
minutes to flush out the pipes.
7. Close the faucet and allow pump to
build pressure in the tank. When
pressure reaches cut-out setting, the
motor will stop.
The system is now operating and will
cycle on demand.
If the pump does not operate after
repeated attempts, check the follow-
ing:
1. Vertical distance of pump to water
must not exceed 25 feet.
2. Suction piping must be air tight.
3. Be sure valves are open if used in
discharge or suction piping.
Never run the
pump with a closed
or clogged discharge. The water inside
the pump could boil and damage the
pump.
The use of a foot valve is strongly rec-
ommended. This allows the suction line
to be filled during the priming process,
greatly decreasing priming times.
Maintenance
Disconnect power supply
and release all pressure from
system before attempting to
install, service, relocate, or perform any
maintenance. Lock the power discon-
nect in the open/off position. Tag the
power disconnect to prevent unexpect-
ed application of power. Serious injury
or death could result.
Maintain adequate ventilation for the
pump motor. The motor bearings are
permanently lubricated at the factory.
Additional lubrication is not required.
DRAINING PUMP
Drain openings are provided on all
models. To drain the pump:
1. Remove the drain fitting and prim-
ing plug.
2. Drain all piping to a point below
the frost line.
DRAINING TANK
Conventional tanks can be drained by
opening an outlet at the lowest point
in the system. Remove a plug or the air
volume control to vent the tank.
Pre-charged tanks force virtually all of
the water from the tank when the sys-
tem pressure is released. No draining is
necessary.
Operating Instructions and Parts Manual
JSU50
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