Maintenance And Troubleshooting; Important - Liberty Pumps 404 Manuel D'installation

For manual operation, or in the event of switch failure, the pump cord can be separated and plugged into the electrical outlet, directly
bypassing the switch. 208-230V single phase pumps should only be operated without the float switch by using the circuit breaker or
panel disconnect. Do not let the pump run dry for extended periods.
Application: The 404 and 405-series drain pumps are designed for use in gray wastewater applications. They will handle small debris
and solids such as laundry lint (up to 3/8") associated with normal gray water drainage from a sink. Larger solids should be kept out of
the pump system. The 405-series is designed for commercial applications where higher temperature drain water (up to 180 degrees F.)
may be used.

3. Maintenance and Troubleshooting

Each unit is individually factory tested to ensure proper adjustment and operation. If the unit fails to operate properly, re-read the
instructions to see that they have been followed correctly. Routine maintenance is not required on the pump itself, but associated
connections may require occasional attention. Lint and foreign objects should be removed from the trap periodically. The check valve
on the discharge should also be checked for freedom of operation at the same time.
The pump is automatically turned on and off by use of a float switch mounted within the tank. This switch can be easily removed and
checked for operation by removing the access cover located on top of the unit. Once the access cover has been removed a rubber plug
must be lifted to free up the switch cord. The switch is mounted to a rod which can be removed by lifting or pulling upward.
IMPORTANT: Do not adjust the tether length. If replacing the switch, make sure to maintain the correct tether length for your
model per the following diagram. (Tether length is the distance of cord measured between the clamp and top of float switch.)
 NOTE: Liberty Pumps, Inc. assumes no responsibility for damage or injury due to disassembly beyond float removal in the field.
Disassembly, other than at Liberty Pumps or its authorized service centers, automatically voids warranty.
Problem
Pump will not turn
on or shut off.
Pump runs or hums
but does not pump.
Pump short-cycles.
Cause

Blown fuse or other interruption of
power; improper voltage.

Plugged vent, or quick-vent in use.

Defective switch or build-up on tank
wall restricting free movement of
float switch.

Discharge is blocked or restricted.

Check valve is stuck closed or
installed wrong.

Total lift height has been reached
(see Fig. 2)

Pump impeller is jammed.

Trap or inlet piping is clogged.

Plugged vent, or quick-vent in use.

Defective switch.

Check valve was not installed, is
stuck open, or is leaking.
© Copyright 2017 Liberty Pumps Inc. All rights reserved
Correction

Check that the unit is securely plugged in.
Have an electrician check all wiring for proper
connections and adequate capacity.

Be sure that an unrestricted vent at least 1-¼"
in diameter is in use. Quick-vents shall not be
used.

*Remove access cover and check that float is
free to move. If build-up restricts float, clean
and reinstall. If defective, replace switch.

Check the discharge line for blockage,
including ice if the line passes through or into
cold areas.

Remove and examine for freedom of
operation and proper installation.

Try routing pipe to a lower level. If not
possible, another pumping station may be
required at a level of roughly half the total lift.

*Disassemble the receiver and bottom base
of pump. Remove foreign material.
Reassemble.

Check the trap and inlet piping for restrictions.

Be sure that an unrestricted vent at least 1-¼"
in diameter is in use. Quick-vents shall not be
used.

*Remove access cover and check that float is
free to move. If build-up restricts float, clean
and reinstall. If defective, replace switch.

Remove and examine for freedom of
operation and proper installation.
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