Liberty Pumps LowPro41LP User manual

Installation Manual
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 800-543-2550
fax: [phone]
www.LibertyPumps.com
Copyright © Liberty Pumps, Inc. 2019 All rights reserved.
4617000L
This product supplied with a
CSA Certified pump.
LowPro-Series
Low Profile Sewage System
Models
LowPro41LP
4/10 hp, 115V
LowPro51LP
1/2 hp, 115V
LowPro52LP
1/2 hp, 230V
Features
• Fully assembled at factory
• 2" Solids handling sewage pump

2 | EN Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 4617000L
Contents
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 | EN
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 | EN
Model Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Inspection and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Pump Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 | EN
Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 | EN
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 | EN
Sample Illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Maintenance and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 | 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.
Installer: manual must remain with owner or system operator/maintainer.
Record information from pump nameplate:
Keep this manual handy for future reference. Pump Model #:
For replacement manual, visit LibertyPumps.com,
or contact Liberty Pumps at 800-543-2550. Pump Serial #:
Retain dated sales receipt for warranty. Manufacture Date:
Install Date:

4617000L Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 3 | EN
Safety Precautions
Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
Always disconnect the pump from power source before
attempting to service the pump. Fatal electrical shock could
occur.
The pump shall be plugged into a properly fused electrical
outlet with a ground fault circuit interrupter (GFCI) that
conforms to current National Electric Code (NEC) and all
applicable local codes. All wiring must be performed by
qualified personnel.
All electrical and safety practices shall be in accordance with
the National Electrical Code®, the Occupational Safety and
Health Administration, or applicable local codes and
ordinances.
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 the pump 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.
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 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.
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.
These pumps are not to be installed in locations classified as
hazardous in accordance with the National Electric Code®,
ANSI/NFPA 70.
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.
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 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.
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.
RISK OF ELECTRIC SHOCK
RISK OF FIRE
RISK OF SERIOUS INJURY OR DEATH

4 | EN Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 4617000L
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 an air admittance valve or a mechanical
spring-loaded venting device.
Do not allow pump to freeze.
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 introduce any consumer item that is not toilet paper
into a non-grinder (dewatering, effluent, sewage) pump/
pump system. This includes, but is not limited to the
following: feminine products, wipes, towels, towelettes,
dental floss, swabs, pads, etc. Items such as these put the
pump under undo strain and can result in pump/pump
system failure. Additionally, it creates conditions for
discharge line blockage.
Model Specifications
For complete listing of models and their specifications, refer to
http://www.LibertyPumps.com/About/Engineering-Specs. System
nameplate provides a record of specific pump information.
Inspection and Storage
Initial Inspection
Inspect the pump immediately for damage that may have
occurred in shipment.
1. Visually check the unit and components for damage.
2. Check all packaging for parts before discarding.
Contact Liberty Pumps customer service to report any damage or
shortage of parts.
List of included parts:
Storage Before Use
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.
Do not allow the pump to freeze.
LowPro systems are shipped from the factory ready for installation
and use. The system should be held in storage if the installation
area is not complete.
If storage is necessary, the LowPro system should remain in its
shipping container. It should be stored in a clean, dry
temperature-stable environment where the pump system and its
container shall be covered to protect it from water, dirt, vibration,
etc. The cord ends must be protected against moisture.
Pump Design
The LowPro system is designed to accept wastewater from a toilet
but can also simultaneously receive wastewater from several
sanitary fixtures such as a sink, shower, or bathtub. However, only
one water closet (toilet) per unit may be connected.
A cover is provided for easy access to the tank and switch without
disturbing the discharge or vent pipe.
The LowPro features an internal jet spray to help break down
solids and reduce jamming. Due to limited water volumes per
pump cycle on systems of this type, care must be taken to avoid
flushing extreme amounts of toilet paper or any reinforced papers,
paper towels, sanitary products and other foreign objects into the
LowPro.
The system starts automatically once the toilet is flushed or liquid
from other fixtures enters the unit. It automatically shuts off once
the contents have been pumped away. Run times will vary
depending on inflow and source.
General Information
Before installation, read these instructions carefully.
Each Liberty Pumps product is individually factory
tested to ensure proper performance. Closely
following these instructions will eliminate potential
operating problems, assuring years of trouble-free
service.
Pumps are certified to CSA® and UL® standards.
Provide serial number in all correspondence.
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.
RISK OF ELECTRIC SHOCK
LowPro Tank
Gasket Tape
for Closet
Flange
Closet Flange
Closet Flange
Extension Kit
Closet Bolt Kit
Wax Ring
2” Pipe Seal
Grommet
Check Valve

4617000L Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 5 | EN
Cords
LowPro systems come with two cords—one to the float switch and
the other to the pump motor. The float switch cord has a
piggyback (series) plug enabling the pump motor cord to be
plugged into the back of it. Both cords must be connected in
series for automatic operation.
The purpose of this design is to allow temporary manual
operation of the pump. For manual operation, or in the event of a
float switch failure, the pump cord can be separated and plugged
into the electrical outlet, directly bypassing the switch.
Use and Care
A routine of regular cleaning will keep the LowPro in good
working order. The exterior of the unit may be cleaned with a
damp cloth and normal household cleaners. Never spray or dump
water or chemicals directly on the unit.
Considerations
The LowPro41LP can be installed freestanding or built-in,
concealing the pump compartment and piping. The platform
section of the tank is sized to fit flush with an elevated floor
framed with 2" x 6" material.
Access to pump compartment is required on built-in installations.
To accommodate future service, it is important to allow access to
the pump and switch cover when the unit is being framed-in with
a wall behind the water closet. This can be accomplished by
framing this portion of the tank into a closet, utility, or other
accessible room.
If installing walls or floor joists, use caution to ensure that nails,
screws, or other sharp objects do not puncture the tank when
framing.
For addition of a sink or shower, a rubber pipe seal is included
that accepts 2" schedule 40 PVC piping. Showers must be elevated
to allow gravity flow to unit.
If connecting a washing machine, the preferred method is to
drain the washer into a tub sink with a lint sock prior to the
LowPro. This requires periodically removing the access cover to
clean lint and debris from the switch.
The tank installation location must be level.
LowPro tank contains three
textured areas acceptable
for installing rubber pipe
grommet. Installation
outside of these areas
may result in damage to
internal components.
Dimensional Data
Installation
1. Position the tank in its desired location and ensure that it is
level.
Use hydraulic cement or similar material for leveling the floor
if necessary.
2. Determine the closest and most readily accessible locations
to tie in the discharge and vent lines to existing lines. Take the
necessary measurements and determine what plumbing
fittings and pipes are needed.
3. An inlet for a 2" PVC drain line from additional fixtures (i.e.,
sink or shower) may be installed using the supplied rubber
pipe grommet.
Determine the best location for the drain line to enter the
tank—making sure it is within the marked textured areas of
the pump chamber. Do not drill below or outside of the
textured areas. Make sure drain lines have adequate gravity
flow to the system. If a shower is being used, elevate the
shower to allow for proper trapping and drainage.
4. Drill a 3" diameter hole and insert the provided grommet.
Slide the 2" PVC drain line into the pipe grommet, lubricating
the pipe if necessary to ease installation.
5. Install a 2" PVC pipe to the discharge connection on the
cover.
Threaded connections at tank require hand-tightening only.
Use thread seal tape to seal pipe threads.
Temporary Manual
O
p
eration
YES!NO!
Do Not Drill
Below This Line
Acceptable Rubber Pipe Grommet Locations
TOP VIEW
14-5/8”
[37 cm]
29-1/2”
[75 cm]
24-1/2”
[62 cm]
12-1/4”
[31 cm]
17”
[43 cm]
12-1/2”
[30.5 cm]
42”
[106.7 cm]
5”
[12.7 cm]
3-3/4”
[9.5 cm]
7”
[17.8 cm]
5-1/4”
[13.3 cm]
SIDE VIEW
7”
[17.8 cm]

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6. Attach the 2” check valve to the discharge pipe as close to the
top of the tank as possible. Make sure that the arrow on the
check valve is pointing up, away from the pump.
Do not reduce the discharge pipe size below 2".
7. Complete the discharge piping to the house waste line using
a minimum number of turns.
8. Install a 2" vent pipe into the vent opening on the cover.
9. Connect the vent pipe to the house vent line or directly to the
atmosphere. Unit must be vented in accordance with local
plumbing codes.
Do not use an air admittance valve or a mechanical
spring-loaded venting device.
10. If installing a finished floor above the LowPro tank system,
continue with steps 11 through 13, otherwise, resume
installation at step 14.
11. The rough opening size required for installation using
standard 2” x 6” floor joists will vary depending on the actual
installation and the orientation of the tank. The overall rough
opening size needed to enclose the entire LowPro tank is 42”
x 24-1/2”. See page 5 for Dimensional Data.
12. Measure the finished flooring thickness and determine the
number of closet flange spacers needed to bring the closet
flange up to the finish floor.
13. Set the proper number of plastic closet flange spacers onto
the brass closet flange. The foam gasket material on the
spacer(s) must be facing down. The spacer(s) will not be
secured to the closet flange, so use care not to move them
during the installation of the toilet.
14. Install the provided wax toilet bowl seal ring onto the toilet
following the directions included with the toilet.
15. Install the toilet onto the closet flange following the
directions included with the toilet.
16. Hook up the water line to the toilet.
17. Turn the water on and fill the toilet tank. Test for leaks. Flush
the toilet several times and allow the pump to cycle to ensure
proper operation.
Sample Illustrations
Figure 1. Typical Finished Installation and
Optional Toilet Orientation
Figure 2. Elevated Shower Side View
Maintenance and Troubleshooting
Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
Always disconnect the pump from power source before
attempting to service the pump. Fatal electrical shock could
occur.
Maintenance
The LowPro system requires no routine maintenance. The exterior
of the unit may be cleaned with a damp cloth and normal
household cleaners. Never spray or dump water or chemicals
directly on the unit.
If a washing machine is connected, periodically remove the access
cover to clean lint and debris from the float switch.
2 x 6 Floor Joist LowPro Tank
Subfloor
(plywood, etc.)
Finish Flooring
(tile, linoleum, etc.) Two supplied
(1/4” and 1/2”)
May be stacked for
total of 3/4”
Spacers
RISK OF FIRE

4617000L Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7 | EN
Float Switch Adjustment
Refer to the diagram to adjust the float
switch. The pump should engage at a
waste depth of approximately 4” and
pump down to around 3”.
To adjust the float switch, remove the
switch access cover and lift the float
switch out of the tank. After adjusting
to the lengths shown, replace the
switch by placing the cord between the
two bosses. Reattach the access cover
to the tank.
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.
Problems and improper operation of the water closet should be
directed to the manufacturer of the water closet and their
installation instructions and troubleshooting guidelines.
1/8”
3-1/2”
3/8”
3-1/8”
Table 1. Troubleshooting Matrix
Problem Possible Cause Corrective Action
Pump does not start.
Tripped circuit breaker, tripped GFCI, blown fuse,
or other interruption of power.
Reset tripped circuit breaker, reset GFCI, replace blown
fuse with properly sized fuse, check that the unit is
securely plugged in, investigate power interruption.
Switch unable to move to the PUMP ON position
due to interference in basin or other obstruction.
Position the pump or float switch so that it has adequate
clearance for free movement.
Insufficient liquid level. Verify the liquid level is allowed to rise enough to
activate the float switch.
Defective float switch. Replace float switch.
Obstructed impeller or volute. Remove obstruction.
Pump runs, but does
not turn off.
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.
Defective float switch. Replace float switch.
Pump runs or hums, but
does not pump.
Discharge is blocked or restricted. Check the discharge line for foreign material, including
ice if the discharge line passes through or into cold areas.
Check valve is stuck closed or installed backward. 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 cycles too
frequently. Check valve not installed, stuck open, or leaking. Install check valve(s); remove check valve and examine
for freedom of operation and proper installation.
Pump runs periodically
when fixtures are not in
use.
Check valve not installed, stuck open, or leaking. 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.

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Warranty
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.
Pump does not deliver
proper capacity.
Discharge partially closed or clogged. Check the discharge line for foreign material, including
ice if the discharge line passes through or into cold areas.
Check valve partially clogged. Raise liquid level up and down to clear; remove check
valve to remove obstruction.
Total head (lift height) is beyond pump's
capability.
Route discharge piping to a lower level. If not possible, a
larger pump may be required. Consult Liberty Pumps.
Obstruction in pump or piping. Remove obstruction.
Pump operates noisily.
Piping attachments to building are too rigid. Replace a portion of the discharge line with rubber hose
or connector.
Worn bearings or other motor problem. Return unit to authorized repair center for service.
Foreign objects in the impeller cavity. Clean the impeller cavity.
Broken impeller. Consult Liberty Pumps for information regarding impeller
replacement.
Repeated tripping.
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. Have an electrician check for proper wiring.
Improper voltage. Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Obstruction in pump. Remove obstruction.
Foreign matter buildup. Clean motor and float switch housing.
Table 1. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action