Installation Manual
2399000D
ProVore® 1 HP Residential Grinder Pumps
PRG-Series
Models
PRG101-Series
115 Volts
PRG102-Series
230 Volts
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 800-543-2550
fax: 585-494-1839
www.LibertyPumps.com
Installer: Manual must
remain with owner/operator.
Keep this manual handy for future reference.
For replacement manual, visit LibertyPumps.com,
or contact Liberty Pumps at 800-543-2550.
Retain dated sales receipt for warranty.
Copyright © Liberty Pumps, Inc. 2020 All rights reserved.
Prior to installation, record information
from pump nameplate for future reference:
Model:
Serial:
Mfg Date:
Install Date:
Contents
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 | EN
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Operating Constraints . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Inspection and Storage. . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Model Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Pump Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 | EN
Pump System Components . . . . . . . . . . . . . . . . . . . . . 5 | EN
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 | EN
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 | EN
Maintenance and Troubleshooting . . . . . . . . . . . . . . . 9 | EN
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 | EN
Safety Guidelines
This safety alert symbol is used in the manual
and on the pump to alert of potential risk for
serious injury or death.
This safety alert symbol identifies risk of
electric shock. It is accompanied with an
instruction intended to minimize potential
risk of electric shock.
This safety alert symbol identifies risk of fire.
It is accompanied with an instruction
intended to minimize potential risk of fire.
This safety alert symbol identifies risk of
serious injury or death. It is accompanied
with an instruction intended to minimize
potential risk of injury or death.
Warns of hazards which, if not avoided, will
result in serious injury or death.
Warns of hazards which, if not avoided, could
result in serious injury or death.
Warns of hazards which, if not avoided, could
result in minor or moderate injury.
Signals an important instruction related to
the pump. Failure to follow these instructions
could result in pump failure or property
damage.
Read every supplied manual before using
pump system. Follow all the safety instructions
in manual(s) and on the pump. Failure to do
so could result in serious injury or death.
Safety Precautions
Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
All installation and maintenance of pumps, controls,
protection devices, and general wiring shall be done by
qualified personnel.
All electrical and safety practices shall be in accordance with
the National Electrical Code
Health Administration, or applicable local codes and
ordinances.
Do not remove cord and strain relief, and do not connect
conduit to pump.
Pump shall be properly grounded using its supplied
grounding conductor. Do not bypass grounding wires or
remove ground prong from attachment plugs. Failure to
properly ground the pump system can cause all metal
portions of the pump and its surroundings to become
energized.
Do not handle or unplug the pump with wet hands, when
standing on damp surface, or in water unless wearing
Personal Protective Equipment.
Always wear dielectric rubber boots and other applicable
Personal Protective Equipment (PPE) when water is on the
floor and an energized pump system must be serviced, as
submerged electrical connections can energize the water. Do
not enter the water if the water level is higher than the PPE
protection or if the PPE is not watertight.
Do not lift or carry a pump or a float assembly by its power
cord. This will damage the power cord, and could expose the
electrically live wires inside the power cord.
The electrical power supply shall be located within the length
limitations of the pump power cord, and for below grade
installations it shall be at least 4 ft (1.22 m) above floor level.
Do not use this product in applications where human contact
with the pumped fluid is common (such as swimming pools,
fountains, marine areas, etc.).
Protect the power and control cords from the environment.
Unprotected power and control (switch) cords can allow water
to wick through ends into pump or switch housings, causing
surroundings to become energized.
Single-phase 208/230V pumps shall only be operated without
the float switch by using the circuit breaker or panel
disconnect.
Some products may have internal capacitors that could cause
shock. Avoid contact with plug ends after removing from
energy source.
Do not use metal or any other electrical conducting material
to raise the float or contact anything inside an electrically live
sump pit.
RISK OF ELECTRIC SHOCK
®
, the Occupational Safety and
2 | EN Copyright © Liberty Pumps, Inc. 2020 All rights reserved. 2399000D
Do not use an extension cord to power the product. Extension
cords can overload both the product and extension cord
supply wires. Overloaded wires will get very hot and can catch
RISK OF FIRE
on fire.
This product requires a separate, properly fused and
grounded branch circuit, sized for the voltage and amperage
requirements of the pump, as noted on the nameplate.
Overloaded branch circuit wires will get very hot and can
catch on fire. When used, electrical outlets shall be simplex of
the appropriate rating.
For cord replacement: power cord must be of the same length
and type as originally installed on the Liberty Pumps product.
Use of incorrect cord may lead to exceeding the electrical
rating of the cord and could result in death, serious injury, or
other significant failure.
Do not use this product with or near flammable or explosive
fluids such as gasoline, fuel oil, kerosene, etc. If rotating
elements inside pump strike any foreign object, sparks may
occur. Sparks could ignite flammable liquids.
Sewage and effluent systems produce and may contain
flammable and explosive gases. Prevent introduction of
foreign objects into basin as sparks could ignite these gases.
Exercise caution using tools and do not use electronic devices
or have live, exposed electrical circuits in or around basins,
open covers and vents.
Manual pumps that have been factory constructed with a
power cord with no male attachment plug must use an
approved motor control panel. Do not wire a switch in series
with the pump power cord as this can overload the wires.
Overloaded wires get very hot and can catch on fire.
These pumps are not to be installed in locations classified as
hazardous in accordance with the National Electric Code
®
ANSI/NFPA 70.
In 208/230V installations, one side of the line going to the
pump is always “hot”, whether the float switch is on or off. To
avoid hazards, install a double pole disconnect near the pump
installation.
Vent basin in accordance with local code. Proper venting of
sewer and effluent gases alleviates poisonous gas buildup
and reduces the risk of explosion and fire from these
flammable gases.
Wear adequate Personal Protective Equipment when working
on pumps or piping that have been exposed to wastewater.
Sump and sewage pumps often handle materials that can
transmit illness or disease upon contact with skin and other
tissues.
Do not enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
Do not remove any tags or labels from the pump or its cord.
Keep clear of suction and discharge openings. To prevent
injury, never insert fingers into pump while it is connected to
a power source.
Do not use this product with flammable, explosive, or
corrosive fluids. Do not use in a flammable and/or explosive
atmosphere as serious injury or death could result.
This product contains chemicals known to the State of
California to cause cancer and birth defects or other
reproductive harm. www.p65warnings.ca.gov.
A grinder pump contains metal parts that rotate at high
speeds. Be careful around pump base while power is
connected. Make sure that the pump is either in the tank or
clear from people and wires when in operation.
This pump has been evaluated for use with water only.
,
Wear Personal Protective Equipment as exposed bottom has
sharp edges.
Energizing the control panel or breaker for the first time is
potentially dangerous. Licensed electrical personnel should
be present when the panel or breaker is energized for the first
time. If faults caused by damage or poor installation practices
have not been detected, serious damage, injury or death can
RISK OF SERIOUS INJURY OR DEATH
result when power is applied.
Do not modify the pump/pump system in any way.
Modifications may affect seals, change the electrical loading
of the pump, or damage the pump and its components.
All pump/pump system installations shall be in compliance
with all applicable Federal, State, and Local codes and
ordinances.
Do not allow children to play with the pump system.
Do not allow any person who is unqualified to have contact
with this pump system. Any person who is unaware of the
dangers of this pump system, or has not read this manual, can
easily be injured by the pump system.
Verify a Redundant Check Valve Assembly (curb stop and
check valve) is installed between the pump discharge and
the street main, as close to the public right-of-way as
possible, on all installations to protect from system
pressures.
Do not dispose of materials such as paint thinner or other
chemicals down drains. Doing so could chemically attack and
damage pump system components and cause product
malfunction or failure.
Do not use pumps with fluid over 140°F (60°C). Operating the
pump in fluid above this temperature can overheat the pump,
resulting in pump failure.
Do not use pump system with mud, sand, cement,
hydrocarbons, grease, or chemicals. Pump and system
components can be damaged from these items causing
product malfunction or failure. Additionally, flooding can
occur if these items jam the impeller or piping.
Do not run dry.
The Uniform Plumbing Code® states that sewage systems
shall have an audio and visual alarm that signals a
malfunction of the system, to reduce the potential for
property damage.
2399000D Copyright © Liberty Pumps, Inc. 2020 All rights reserved. 3 | EN
Do not position the pump float directly under the inlet from
drain tile or in the direct path of any incoming water.
Any PRG-Series system discharge can be reduced to 1-1/4”.
Keep pump upright.
At no time should the pump be stored within an incomplete
wet pit. The pump should not be placed into the pit until it
can be fully operational.
Do not allow the pump to freeze.
General Information
Before installation, read these instructions carefully.
Each pump is individually factory tested to ensure
proper performance. Closely following these
instructions will eliminate potential operating
problems, assuring years of trouble-free service.
PRG-Series pumps are to be used for handling
septic tank effluent, sewage, and drain (storm)
water.
Provide pump serial number in all correspondence.
Pumps are CSA certified to CSA and UL®
standards.
Pumps must be serviced at a qualified repair facility
approved by Liberty Pumps. No repair work should
be carried out during the warranty period without
prior factory approval. Any unauthorized field
repairs void warranty. Contact Liberty Pumps at
1-800-543-2550 to locate the closest authorized
service center.
Operating Constraints
It is extremely important to verify that the pump
has been sized correctly for the intended
installation. The operating point of the pump must
lie within the acceptable range as outlined by the
applicable Liberty Pumps performance chart.
Operating the pump outside of the recommended
range can invalidate the CSA Certification of the
pump and can also cause damage and premature
failure. Operating outside of the recommended
range can cause the pump to exceed its rated
nameplate amp draw, which will void the pump
certification. It can also cause motor overheating,
cavitation, excessive vibration, clogging, and poor
energy efficiency.
Inspection and Storage
Initial Inspection
The pump should be immediately inspected for damage that may
have occurred in shipment.
1. Visually check the pump and any spare parts for damage.
2. Check for damaged electrical wires, especially where they exit
the motor housing.
Contact Liberty Pumps customer service to report any damage or
shortage of parts.
Storage Before Use
RISK OF ELECTRIC SHOCK
Protect the power and control cords from the environment.
Unprotected power and control (switch) cords can allow water
to wick through ends into pump or switch housings, causing
surroundings to become energized.
At no time shall the pump be stored within an incomplete wet
pit. The pump shall not be placed into the pit until it can be
fully operational.
Do not allow the pump to freeze.
Pumps are shipped from the factory ready for installation and use.
Hold the pump in storage if the pump station is not complete.
If storage is necessary, the pump should remain in its shipping
container. It should be stored in a warehouse or storage shed that
has a clean, dry temperature-stable environment where the pump
and its container are covered to protect it from water, dirt,
vibration, etc. The cord ends must be protected against moisture.
Uninstalled pumps that are idle for greater than three months
should have cutters and impellers manually rotated once a month
to lubricate the seals.
Installed pumps that are idle for greater than one month should
have cutters and impellers manually operated through the breaker
panel once a month to lubricate the seals. For automatic models,
turn off the breaker, unplug the piggyback switch, and plug the
pump directly into receptacle. Turn the breaker on for 30 seconds,
then turn the breaker off. Plug the piggyback switch back in. Refer
to Piggyback Switch Operation on page 8.
Model Specifications
For complete listing of models and their specifications, refer to
http://www.LibertyPumps.com/About/Engineering-Specs. Pump
nameplate provides a record of specific pump information.
4 | EN Copyright © Liberty Pumps, Inc. 2020 All rights reserved. 2399000D
Pump Design
Float Switches
PRG-Series grinder pumps are designed for continuous underwater operation. The motor and pump form a close-coupled,
watertight unit. The induction motor is insulated against heat and
moisture in accordance with Class B 265°F (130°C) regulations.
The motor is protected against damage from water entry by a
mechanical type cartridge seal with two silicon carbide faces.
The impeller and volute are designed for efficient flow
characteristics and clog-free operation. The hardened cutters
grind solids and fibrous matter into small particles that can be
safely pumped through small diameter piping.
For added protection, consider the addition of a Liberty Pumps
back-up pump, as well as a high water level alarm in applications
where loss of pump function could result in property damage. If
an alarm is used, it must be connected to a separate electrical
circuit. A duplex pumping system is recommended for critical
installations.
Pump System Components
Control Panel
Manual PRG-Series pumps (“M” suffix) require a separate,
approved pump control device or panel for automatic operation.
Operation will be according to the control selected. Refer to
separate manufacturer’s instructions supplied with the unit. Verify
the electrical specifications for the control panel properly match
those of the pump.
Mounting, installation, and wiring connections are specific to the
control panel used. Refer to the manufacturer’s instructions
supplied with the unit.
IMPORTANT: When connecting a PRG-Series pump to an existing
control panel, verify the panel is correctly sized and equipped for
the pump.
Control panels designed for use with the PRG-Series pumps
available from Liberty Pumps can be found at http://
www.LibertyPumps.com/Portals/0/Files/panel_selection_guide.pdf
or contact Liberty Pumps.
Thermostat
A thermal overload (thermostat) is integrally mounted to the
motor and wired to shut down the pump if overheating occurs.
The thermostat resets automatically after the pump has cooled.
Single-phase 208/230V pumps shall only be operated without
the float switch by using the circuit breaker or panel
RISK OF ELECTRIC SHOCK
disconnect.
Automatic Models
Automatic models (“A” suffix) come factory-equipped with a float
switch mounted to the pump. These models come with two
cords—one to the float switch and the other to the pump motor.
The float switch cord has a series (piggyback) plug enabling the
pump motor cord to be plugged into the back of it. The purpose
of this design is to allow temporary manual operation of the
pump. On/Off operation of the pump must be controlled by the
circuit breaker. For manual operation, refer to Piggyback Switch
Operation on page 8.
In the event of switch failure, the pump cord can be separated and
plugged into the electrical outlet, directly bypassing the switch.
Pumps should only be operated without the float switch by using
the circuit breaker or panel disconnect.
The turn ON level of automatic models is approximately 12” to 16”
above the bottom of the basin. The turn OFF level is
approximately 6” above the bottom of the basin. Other pumping
differentials may be obtained by tethering the switch cord to the
discharge pipe. Note: A minimum cord length of 3-1/2” from the
tether point to the top surface of the float is required for proper
switch operation. If using a differential other than the factory
setting, verify the pump shuts off with at least 6” of fluid left in the
basin so the impeller remains submerged.
Vertical switch models have pumping differentials pre-set by a
rubber stopper placed on the float rod. To reset the pumping
differential, slide the stopper to the required height to set the off
position. This height Is approximately 2” from the bottom of the
float rod, or high enough that the float does not have the
potential to hang up on the pump or discharge.
Switchless (Manual) Models
Manual pumps that have been factory constructed with a
power cord with no male attachment plug must use an
approved motor control panel. Do not wire a switch in series
with the pump power cord as this can overload the wires.
Overloaded wires get very hot and can catch on fire.
Manual pumps (“M” suffix) with no switch are intended to be run
using an approved liquid level control or approved motor control
with correct rating that matches motor input in full load amperes.
If the pump(s) are to be operated by either a simplex or duplex
control panel, or other optional control device, follow the
manufacturer’s instructions provided with the control panel for
power connections.
RISK OF FIRE
2399000D Copyright © Liberty Pumps, Inc. 2020 All rights reserved. 5 | EN
Float Sequence: Piggyback (Automatic Models)
1. As the liquid level in the basin rises, the float tilts, closing the
switch. This starts the pump.
2. The pump runs until the liquid level falls below the Pump OFF
level of the float (factory set at 6”), emptying the basin.
Float Sequence: Simplex (Manual Models)
1. As the liquid level in the basin rises, the Pump OFF float tilts,
closing the switch. This level must be set at a minimum of 6”.
As the liquid level continues to rise, the Pump ON float tilts.
This switch closes, starting the pump.
2. The pump runs until the liquid level falls below the Pump OFF
float, emptying the basin.
3. In the event of a malfunctioning float switch, control relay, or
pump, the liquid level rises and tilts the High Level Alarm
float. The alarm system will activate.
Float Sequence: Duplex (Manual Models)
1. As the liquid level in the basin rises, the Pump OFF float tilts,
closing the switch. As the liquid level continues to rise, the
Lead Pump ON float tilts. This switch closes, starting the lead
pump.
2. The pump runs until the liquid level falls below the Pump OFF
float, emptying the basin.
3. On the next rise of the liquid level, the other pump will start
on the Lead Pump ON signal. The pumps will continue to
alternate their cycles. Note: The ON/OFF float switch
differential should be set as to not exceed 12 starts per hour.
4. If the liquid level rises to the Lag Pump ON float, the second
pump will start. Both pumps will run until the liquid falls
below the Pump OFF float, emptying the basin.
5. In the event of a malfunctioning float switch, control relay, or
pump, the liquid level rises and tilts the High Level Alarm
float. The alarm system will activate.
Preparation
Prepare Existing Sump [Basin]
If replacing a previously installed pump, prepare the basin by
removing the old pump and cleaning any debris from the basin.
Inspect all remaining equipment in the basin including piping,
valves, and electrical junction boxes (if present) and repair or
replace as appropriate.
Prepare New Sump [Basin]
Excavation
Locate all overhead and underground utilities before
excavating.
Excavate the hole as small as possible, with a minimum
recommended 8” diametrical clearance around the tank. Never
place the basin directly in contact with rocks or other sharp
objects. Place only fine, 1/8” to 3/4” pea gravel or 1/8” to 1/2”
washed, crushed stone as bedding between the basin and the
hole walls. Do not use sand or native soil as backfill. Properly
compact underneath the basin to provide a solid, level base that
can support the weight of the filled basin.
RISK OF SERIOUS INJURY OR DEATH
Inlet Connection & Initial Backfill
Use only fine, 1/8” to 3/4” pea gravel or 1/8” to 1/2” washed,
crushed stone around the bottom of the basin to hold it in place.
Do not use sand or native soil as backfill.
Make the inlet connection as required per basin.
Liberty Pumps P370 and P380-Series Basins have a 4” inlet
molded to the side of the tank. This inlet is sized to accept a 4”
no-hub type coupling. Connect the gravity drainage line from the
fixtures to this hub.
Other Liberty Pumps basins provide a 4” caulking hub or pipe
grommet inlet. Hubs utilize caulking material or rubber donuts;
grommets are a simple slip-fit. Connect the gravity drainage line
from the fixtures to this opening. Other inlet sizes are available,
consult factory.
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
RISK OF ELECTRIC SHOCK
the pump system, or the control panel.
The basin required for effluent and sewage applications must be
sealed and vented to meet health and plumbing code
requirements. The diameter should be a minimum of 18” and the
depth a minimum of 24”. A larger basin may be required
depending on local codes and the number of fixture units
entering the system.
Final Backfill
Keep large rocks, clods, and foreign objects out of the backfill
material. Only fine, 1/4” to 3/4” pea gravel, or 1/8” to 1/2” washed,
crushed stone is recommended. Do not use sand or native soil as
backfill. Mound the backfill slightly and allow for natural settling.
Provide access to the basin cover for maintenance and service.
Compaction of backfill materials must be adequate to ensure the
support of the tank, and to prevent movement or settlement.
Note: Do not exert heavy pressure or run heavy equipment on the
backfill material as this could cause the tank to collapse.
Pump installation should be at a sufficient depth to ensure that all
plumbing is below the frost line. If this is not feasible, remove the
check valve and size the basin and/or adjust pump differential to
accommodate the additional backflow volume. Consult Liberty
Pumps for details on how this should be done.
6 | EN Copyright © Liberty Pumps, Inc. 2020 All rights reserved. 2399000D
Alarm
(optional)
Vent
Union Check Valve
Ball Valve
Discharge
Use No-hub Style
Connector 4" Inlet Pipe
Pump Control and Alarm Floats
The engineering drawings will generally specify the levels for
Pump ON, Pump OFF, and High Level alarm. If they are not
specified, the guidelines in Table 1 should be used to determine
float switch locations. The upper water level should be positioned
to minimize pump starts. The High Level alarm float must be
above the Pump ON float but below any inlets. No float should be
set above the inlet to the basin.
Table 1. Float Switch Settings
System Float Levels
Factory set.
3-1/2” float tether.
Piggyback Switch
Pump OFF
(1-Float System,
Wide-Angle)
Pump ON
Factory set.
3-1/2” float tether.
Cutter and Impeller Free Movement Check
Wear Personal Protective Equipment as exposed bottom has
sharp edges.
Do not connect any power to pump until this check is complete.
Manually rotate the cutter to check that it spins freely with very
little resistance. The cutter is located on the bottom of the pump.
The cutter can be carefully rotated by hand, or rotated by
inserting a tool into the cutter bolt. If rotating by hand, wear
protective gloves as the cutter and cutter plate have sharp edges.
The pump can remain upright or can be laid down on its side for
easier access to the cutter. Besides verification that the cutter and
impeller are freely spinning, rotating the cutter helps to lubricate
the shaft seals if the pump has been non-operational for more
than a week. It is recommended to rotate the cutter 5–10 full
rotations.
Piggyback Switch
(1-Float System,
Ver tica l)
Simplex Pump
Station
(3-Float System)
Duplex Pump
Station
(4-Float System)
Pump OFF
Pump ON
Pump OFF
Pump ON
High Level
Pump OFF
Lead Pump ON
Lag Pump ON
Factory set.
2” from bottom of
float rod.
Maximum travel on
float rod.
Level to top of motor
housing.
Minimum 1-1/2’ above
Pump OFF level.
Minimum 1’ above
Pump ON level and
below inlet pipe. Below
influent pipe.
Level to top of motor
housing.
Minimum 1-1/2’ above
Pump OFF level.
Minimum 1’ above
Lead Pump ON level.
Installation
All installation and maintenance of pumps, controls,
protection devices, and general wiring shall be done by
qualified personnel.
All electrical and safety practices shall be in accordance with
the National Electrical Code
Health Administration, or applicable local codes and
ordinances.
Figure 1 shows a typical installation. Variations may apply to
actual installation.
RISK OF ELECTRIC SHOCK
®
, the Occupational Safety and
Minimum 1’ above Lag
High Level
Pump ON level and
below inlet pipe. Below
influent pipe.
Figure 1. Typical Indoor Installation (Pro380-Series shown)
2399000D Copyright © Liberty Pumps, Inc. 2020 All rights reserved. 7 | EN
Ground
Black
Junction Box
Power
Supply
White
Float
Switch
Pump
Green
Black
White
Green
Black
White
Temporary Manual
YES!NO!
Electrical Connections
Piggyback Switch Operation
With main power disconnected, complete pump and control
wiring connections per manufacturer’s wiring diagrams included
with the control panel as applicable. Once wiring is complete,
check all wires for unintentional grounds.
Pump
Record information from pump nameplate onto inside cover of
these instructions. Complete a visual inspection before lowering
into basin.
Place pump in basin being sure the mounting interface (i.e.,
torque stop) is engaged correctly.
Discharge
Make all discharge connections. A check valve is required to
prevent the backflow of liquid after each pumping cycle. A gate
valve should follow the check valve to allow periodic cleaning of
the check valve or removal of the pump. The remainder of the
discharge line should be as short as possible with a minimum
number of turns to minimize friction head loss. Do not reduce the
discharge to below the pump outlet size. Larger pipe sizes may be
required to eliminate friction head loss over long runs. Contact
Liberty Pumps or other qualified person if questions arise
regarding proper pipe size and flow rates.
Vent
Vent basin in accordance with applicable plumbing codes.
Single-phase 208/230V pumps shall only be operated without
the float switch by using the circuit breaker or panel
RISK OF ELECTRIC SHOCK
disconnect.
Some products may have internal capacitors that could cause
shock. Avoid contact with plug ends after removing from
energy source.
For automatic operation, the two cords should be interconnected
and plugged into a separately fused, grounded outlet of proper
amp capacity for the selected pump model. Both cords are
equipped with 3-prong plugs and must be plugged into a
properly grounded 3-wire receptacle. Do not remove the ground
prongs.
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 and using the circuit breaker or
panel disconnect to operate the pump.
Operation
Figure 3. Piggyback Switch Operation
Automatic Pump Direct Wiring
RISK OF SERIOUS INJURY OR DEATH
In 208/230V installations, one side of the line going to the
pump is always “hot”, whether the float switch is on or off. To
avoid hazards, install a double pole disconnect near the pump
installation.
If the pump will be wired directly into a control device or junction
box, it is necessary to remove the plug. Qualified personnel shall
complete the wiring in accordance with the National Electric Code
and applicable local codes. A disconnecting means for the pump
shall be located in sight from the pump/basin location. See
Figure 2 for direct wire installation of automatic pumps.
Figure 2. Direct Wiring of Automatic Pumps
Operation
Energizing the control panel or breaker for the first time is
potentially dangerous. Licensed electrical personnel should
be present when the panel or breaker is energized for the first
time. If faults caused by damage or poor installation practices
have not been detected, serious damage, injury or death can
result when power is applied.
Starting System
1. Verify all plumbing components in the basin are installed
correctly and functional. Verify all valves are open and ready
for pump use.
2. Double check all wire connections. Re-tighten all factory and
field connections.
3. Ensure pump has no obstructions.
4. With all electrical and mechanical connections complete and
secure, turn on power to pump and control panel, if
applicable.
5. Verify operation of the pump, floats, and alarm circuits.
6. Run several cycles of water through the system to verify
correct control operation for the installation.
Be certain to complete adequate testing, especially on systems
with multiple pumps or custom control configurations.
RISK OF SERIOUS INJURY OR DEATH
8 | EN Copyright © Liberty Pumps, Inc. 2020 All rights reserved. 2399000D
Maintenance and Troubleshooting
Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
Wear adequate Personal Protective Equipment when working
on pumps or piping that have been exposed to wastewater.
Sump and sewage pumps often handle materials that can
transmit illness or disease upon contact with skin and other
tissues.
Do not enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
Problem Possible Cause Corrective Action
RISK OF ELECTRIC SHOCK
RISK OF SERIOUS INJURY OR DEATH
Table 2. Troubleshooting Matrix
Maintenance
Pump should be checked quarterly for corrosion and wear. As the
motor is oil-filled, no lubrication or other maintenance is required.
Pump is permanently lubricated and cooled by turbine oil. If
replacement oil is required, use 0.5 gallons ISO VG 10 turbine oil.
Troubleshooting
No repair work shall be carried out during the warranty period
without prior factory approval. To do so may void the warranty.
Liberty Pumps, Inc. assumes no responsibility for damage or injury
due to disassembly in the field. Disassembly, other than at Liberty
Pumps or its authorized service centers, automatically voids
warranty.
Pump does not start.
Damaged power or control cord. Replace as needed.
Control panel selector switch in OFF position. Set selector switch to Hand or Auto position.
Tripped circuit breaker, tripped GFCI, blown fuse,
or other interruption of power.
Improper voltage.
Reset tripped circuit breaker, reset GFCI, replace blown
fuse with properly sized fuse, check that the unit is
securely plugged in, investigate power interruption.
Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Check voltage. If under 108 V, check wiring size.
Low line voltage.
Remove extension cord or use with heavier gauge.
Float switch is unable to move to the Pump ON
position due to interference in basin or other
obstruction.
Insufficient liquid level.
Position the pump or float switch so that it has adequate
clearance for free movement.
Verify the liquid level is allowed to rise enough to
activate float switch(es).
Defective float switch. Replace float switch.
Obstructed impeller or volute. Remove obstruction.
Loose wiring connections. Check and tighten all connections.
Thermal overload tripped. Wait for pump to cool to operating temperature.
Pump does not start
Unintentional ground.
and overload heaters
trip.
2399000D Copyright © Liberty Pumps, Inc. 2020 All rights reserved. 9 | EN
Obstructed impeller or volute. Remove obstruction.
Turn off power and check motor leads for possible
ground.
Table 2. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action
Pump operates with
control panel selector
switch in Hand position
but does not operate in
Auto position.
Pump runs, but does
not turn off.
Pump runs or hums, but
does not pump.
Check float level control or the alternator relay for issues.
Control circuits malfunctioning.
Check control panel.
Control panel selector switch in Hand position. Set selector switch to Auto position.
Float switch unable to move to the Pump OFF
position due to interference with the side of
basin or other obstruction.
Position the pump or float switch so that it has adequate
clearance for free movement.
Control panel failure. Check control panel.
Defective float switch. Replace float switch.
Discharge is blocked or restricted.
Check valve is stuck closed or installed backward.
Check the discharge line for foreign material, including
ice if the discharge line passes through or into cold areas.
Remove check valve(s) and examine for freedom of
operation and proper installation.
Gate or ball valve is closed. Open gate or ball valve.
Total head (lift height) is beyond pump's
capability.
Route piping to a lower level. If not possible, a larger
pump may be required. Consult Liberty Pumps.
Obstructed impeller or volute. Remove obstruction.
Pump does not deliver
proper capacity.
Motor stops and then
restarts after short
period but overload
heaters in starter do not
trip.
Pump cycles too
frequently.
Pump runs periodically
when fixtures are not in
use.
Discharge valve(s) partially closed or clogged.
Check valve partially clogged.
Total head (lift height) is beyond pump's
capability.
Check the discharge line for foreign material, including
ice if the discharge line passes through or into cold areas.
Raise liquid level up and down to clear; remove check
valve to remove obstruction.
Route discharge piping to a lower level. If not possible, a
larger pump may be required. Consult Liberty Pumps.
Low liquid level. Check liquid level.
Incorrect motor rotation. Contact factory.
Obstruction in pump or piping. Remove obstruction.
Pump operating on a short cycle due to basin
being too small.
Water returning to basin due to leaking check
valve.
A larger basin may be required. Consult Liberty Pumps.
Replace check valve.
Improper float switch setting. Adjust float switch setting.
Check valve not installed, stuck open, or leaking.
Check valve not installed, stuck open, or leaking.
Install check valve(s); remove check valve and examine
for freedom of operation and proper installation.
Install check valve(s); remove check valve and examine
for freedom of operation and proper installation.
Fixtures are leaking. Repair fixtures as required to eliminate leakage.
10 | EN Copyright © Liberty Pumps, Inc. 2020 All rights reserved. 2399000D
Table 2. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action
Pump operates noisily.
Repeated tripping.
Piping attachments to building are too rigid.
Pump is being run below minimum head
requirement causing cavitation.
Replace a portion of the discharge line with rubber hose
or connector.
A different sized pump or impeller may be required.
Consult Liberty Pumps.
Incorrect motor rotation. Contact factory.
Foreign objects in the impeller cavity. Clean the impeller cavity.
Circuit protection underrated. Check rating and replace with proper size.
Other appliance on same circuit. Pump requires separate circuit.
Pump is connected to an extension cord or
wiring is inadequate or compromised.
Improper voltage.
Have an electrician check for proper wiring.
Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Obstruction in pump. Remove obstruction.
Incorrect motor rotation. Contact factory.
Foreign matter buildup. Clean motor housing.
2399000D Copyright © Liberty Pumps, Inc. 2020 All rights reserved. 11 | EN
Warranty
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 800-543-2550
fax: 585-494-1839
www.LibertyPumps.com
Liberty Pumps Wholesale Products Limited Warranty
Liberty Pumps, Inc. warrants that Liberty Pumps wholesale products are free from all factory defects in material and workmanship for a
period of three (3) years from the date of purchase (excluding batteries). The date of purchase shall be determined by a dated sales
receipt noting the model and serial number of the pump. The dated sales receipt must accompany the returned pump if the date of
return is more than three years from the date of manufacture noted on the pump nameplate.
The manufacturer's sole obligation under this Warranty shall be limited to the repair or replacement of any parts found by the
manufacturer to be defective, provided the part or assembly is returned freight prepaid to the manufacturer or its authorized service
center, and provided that none of the following warranty-voiding characteristics are evident:
The manufacturer shall not be liable under this Warranty if the product has not been properly installed, operated, or maintained per
manufacturer instructions; if it has been disassembled, modified, abused, or tampered with; if the electrical cord has been cut, damaged,
or spliced; if the pump discharge has been reduced in size; if the pump has been used in water temperatures above the advertised rating;
if the pump has been used in water containing sand, lime, cement, gravel, or other abrasives; if the product has been used to pump
chemicals, grease, or hydrocarbons; if a non-submersible motor has been subjected to moisture; or if the label bearing the model and
serial number has been removed.
Liberty Pumps, Inc. shall not be liable for any loss, damage, or expenses resulting from installation or use of its products, or for indirect,
incidental, and consequential damages, including costs of removal, reinstallation or transportation.
There is no other express warranty. All implied warranties, including those of merchantability and fitness for a particular purpose, are
limited to three years from the date of purchase. This Warranty contains the exclusive remedy of the purchaser, and, where
permitted, liability for consequential or incidental damages under any and all warranties are excluded.
12 | EN Copyright © Liberty Pumps, Inc. 2020 All rights reserved. 2399000D
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