Liberty Pumps LCU-PR20S User manual

1
Plenum-Rated
Condensate Pump
Installation
2235000A
Models
LCU-PR20S
LCU-PR220S

2
Introduction
Safety Information
Please read, understand, and follow all safety instructions. Failure to follow
instructions may result in property damage, serious injury, or death.
DANGER
Always disconnect power prior to moving, adjusting, or servicing pump or attached
systems. DO NOT use this pump in the presence of spraying or standing water.
Failure to do so could result in a fatal electric shock.
WARNING: Fire and Explosion Hazard
DO NOT use this pump to move flammable or explosive liquids. DO NOT use this
pump in explosive or flammable environments.
Ensure that pump is mounted away from heat exchanger or wiring. If you are unsure
of any items in this manual, please consult a professional and DO NOT attempt to
install this product.
CAUTION: Flood Risk
Personal injury or property damage can result from an inoperative pump. If a flood
has occurred, DO NOT walk in wet area until all power has been turned off. Check
with local electric company or a qualified electrician before disconnecting any
electrical service prior to pump removal.
WARNING
Pump must be properly wired to condensate producing appliance control board in
order to shut off appliance in alarm (high water) conditions.
Supply voltage and frequency must match what is shown on pump nameplate.
Source voltages lower than the rated supply can reduce performance and cause
pump to overheat.
Pump must be level and should be mounted to, or placed on, a solid surface or
floor.
DO NOT cover pump air vents. Pump is air cooled. DO NOT cover vent holes
located on top or sides of the pump housing. Pump may be operated continuously
as long as air vents are not covered.
Pump should be installed indoors. The chosen location should be clean and dry.
This pump is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the pump
by a person responsible for their safety. Children should be supervised to ensure that
they do not play with the pump.
Temperature Rating (not tested for hot water)
• Continuous duty 140˚F
• Max inlet temperature 160˚F
• Not suitable for contact with steam or gases that exceed 160˚F
This pump should be installed by HVAC/R trained service professionals.

3
General Information
This pump is designed to automatically remove condensate water that collects
from appliances such as air conditioners and dehumidifiers. The pump has a
built‑in tank that collects water from the appliance. When collected water
reaches sufficient level inside the pump tank, the unit switches on and pumps
water to a remote location for removal.
When the tank is sufficiently empty, the pump automatically switches off. Pump
is capable of lifting water up to 22 ft and is equipped with a check valve that
prevents water from flowing back into the tank when the pump shuts off.
The pump is outfitted with LED indicators that show the status of power
available, motor running, and high water (alarm) conditions. The pump is also
equipped with a switch that activates when water in the tank reaches an
overflow condition. The overflow safety switch may be connected to turn off
the appliance if high water conditions occur.

4
LCU-PR20S LCU-PR220S
Rated Voltage 120 Volts/60 Hz 230 Volts/60 Hz
Rated Current Draw 1.9 Amps 1.0 Amps
Head Height 22 ft maximum 22 ft maximum
Flow Rate at Zero Head 1.6 GPM 1.0 GPM
Product Weight 4.7 lbs 4.7 lbs
Inlet Height from Base 1.75” 1.75”
Specifications
Features
Metal Hang Tabs
LED Indicator Lights
Inlet Hole
Inlet Hole Cover Rubber Feet
Check Valve
A
B
PART DESCRIPTION QUANTITY
A Condensate Pump 1
B Inlet Hole Covers 3
Package Contents

5
1a. Place on Floor
Determine condensate pump location. Pump must be level and should
be mounted to, or placed on, a solid surface or floor away from moving
objects and extreme heat.
Mounting Options
1a
Installation

6
1b. Attach to Wall (optional)
Attach condensate pump with screws, through mounting tabs
(8” between mounting tabs).
Option: Reverse Top If Necessary
Pump top may be rotated 180˚
to allow access to pump outlet or
power connection.
How to rotate pump top
1. Set pump on solid surface.
2. Hold pump cover with one hand.
3. With other hand, push one
hanging tab away from centerline
of the pump perpendicular to
wide part of tab.
4. There should be a click sound.
5. Repeat for other hanging tab.
6. The pump should be free from base.
7. Lift pump off tank and rotate 180 degrees.
8. Push pump onto tank and there should be two click sounds.
9. Check that pump is secured to tank.
Installation
1
1
2
1b
8"
(20.3 cm)
8"
(20.3 cm)
Mounting
tab

7
Outlet Connection
3. Install Outlet Tube Connection
Attach plastic tubing to check valve and secure with hose clamp (sold
separately). Route tubing up and away from condensate pump (avoid
compressing or kinking tubing).
1
2
3/8" Clear Vinyl
Plastic Tubing
5/8" Hose Clamp
Check Valve
3
Support pump and piping when assembling and when installed. Failure to do so
may cause piping to break, pump to fail, motor bearing failures, etc.
2. Level Unit
Ensure that condensate pump is level. If unit is out of level by more than 15º
from horizontal surface, it will not function properly and warranty and property
protection will not be valid.
Installation
2

8
Inlet Holes
Inlet Tubing
Inlet Holes
45˚Angle
Inlet Tubing
4
4. Install Inlet Tube Connections
Install condensate drain tubing into one of the four inlet holes, making sure
tubing is vertical. Inlet tubing should be cut to 45 degree angle.
If installing to a humidifier, a “P” trap should be used.
To Condensate
Pump
“P”Trap
Condensate
Drain Tubing
To Humidier
Installation
Inlet Connection

9
5
5. Install Inlet Covers
Insert inlet covers in remaining condensate pump inlet holes.
Installation

10
WARNING: Risk of Electric Shock
This pump must be properly connected to power following the National
Electric Code (NEC). Failure to follow these warnings will void the warranty
and could result in a fatal electric shock. A green LED will indicate if power
is available. The pump is supplied with a grounding conductor. To reduce
the risk of electric shock, be certain that it is connected to ground. Discon‑
nect power before working on or around the pump.
1. This pump is supplied with lead wires and intended to be hardwired using
a junction box or other approved enclosure. This pump includes a conduit
connector for using 1/2” flexible metal conduit. The conductors must
be enclosed in conduit in accordance with local authority, NEC, and
Occupational Safety and Health Act (OSHA).
2. The installation should be performed by a qualified technician. Comply
with national and local electrical and plumbing codes as well as local
authority,NEC, and OSHA.
3. Pump conductors must be connected to voltage specified on the pump
nameplate. Power conductors must be connected to a constant source
of power (not a fan or other device that runs occasionally). The power
conductors provided must be enclosed in conduit and hardwired inside a
junction box or other approved enclosure.
4. Final installations should always be inspected and approved by the
local authority of jurisdiction per requirements set forth by the same local
authority.
6. Electrical Connection and Safety Switch
Installation
6
SYSTEM
T-STAT
Com
Run
OVEFLOW SWITCH
24V 1A Max
YRGB
YBRGB
SYSTEM
T-STAT
Com
Run
OVEFLOW SWITCH
24V 1A Max
YWGB
YBWGB
120V
230V

11
6b. Safety Switch
The safety switch should be connected to a Class II Low Voltage circuit. The
safety switch wires are yellow and yellow with black stripe. Do not confuse
these wires with the power conductors.
The safety switch connection is normally closed (NC). Refer to thermostat
and air conditioning or refrigeration unit’s operating instructions when
using the safety switch. Be sure to disconnect power to the air conditioning
or refrigeration unit when installing or modifying the safety switch circuit.
Connect the safety switch in series with the low voltage thermostat circuit as
specified in the thermostat’s operating manual.
Installation
6a. Conduit Connection
1. Loosen conduit fitting nut.
2. Rotate fitting for desired application.
3. Route wires through conduit.
4. Align conduit and insert conduit into conduit fitting.
5. Tighten conduit screws.
To prevent abrasion of wires, conduit should be reamed or finished to
remove rough edges.
6a
125
Pump power connections - 120V Pump power connections - 230V
G‑G, Green – ground G‑G, Green – ground
W‑W, White – neutral B‑B, Black – line 1
B‑B, Black – line R‑R, Red – line 2
Y‑YB, Yellow / Yellow with Black Stripe –
alarm circuit
Y‑YB, Yellow / Yellow with Black Stripe –
alarm circuit

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1
1
1
Operation
1
2
2
1. Testing Float
Manually fill the tank with water. An amber LED will indicate pump is
operating. A green LED indicates pump has power.
2. Testing Overflow Switch (if connected)
Manually overfill tank with water. If overflow safety switch is wired correctly,
appliance will shut down, condensate pump will pump out water, and a red
LED will illuminate.

13
LED Indicator Status
LED STATUS
Green Indicates pump has power and is ready.
Amber Indicates pump is running and removing condensate from
tank.
Red Indicates pump is in alarm mode and that the system is
shutoff/disabled (if connected).
Operation

14
Maintenance and Disassembly
Always disconnect power before performing maintenance. Pump and
deck may be removed from tank by pushing tabs located on tank sides
away from deck while lifting on pump cover.
Periodically inspect the condensate
pump tank to ensure it is free of
accumulated dirt or sludge. DO
NOT use solvent cleaners. Clean
tank with mild soap and warm water
only. Check valve may be removed
for cleaning or replacement by
unscrewing with a 15mm wrench.
Clean inlet and outlet piping.
Reassemble system and check for
correct operation.
2
1

15
Troubleshooting
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Unit does
not start
when full of
condensate.
1. Power is not
supplied to pump.
1. Ensure that power is supplied to pump. A
green LED indicator on top of pump cover
will show that power is supplied and that
pump is ready.
2. Pump impeller is
not turning.
2. Clear any blockage in impeller housing.
If problem persists, motor is stuck. Return
pump to place of purchase if under
warranty.
Condensate
is overflowing
from unit.
1. Power is not
supplied to pump.
1. Ensure that power is supplied to pump. A
green LED indicator on top of pump cover
will show that power is supplied.
2. Pump is in overflow
condition.
2. The inlet flow to condensate pump is
exceeding outlet flow. Check to ensure
that pump safety switch (alarm circuit) is
connected to appliance. The safety switch
connection will shut off appliance in this
condition.
3. Pump is not level. 3. Check to ensure that pump is level. If
pump is not level, it may not activate,
causing water to overflow from tank.
Place unit on a flat and level surface.
4. Outlet flow is
blocked.
4. Check outlet tubing to ensure that it is not
kinked or blocked. Clear blocked tubing
of slime and debris. Clean inlet and outlet
piping.
5. Pump impeller is
not turning.
5. Clear any blockage in impeller housing.
If problem persists, motor is stuck. Return
pump to place of purchase if under
warranty.
Pump will not
shut off.
1. The pump is
in overflow
condition.
1. The inlet flow to condensate pump is
exceeding outlet flow. Check to ensure
that pump safety switch (alarm circuit) is
connected to A/C or dehumidifier unit.
The safety switch connection will shut off
A/C or dehumidifier unit.
2. Outlet flow is
blocked.
2. Check outlet tubing to ensure that it is not
kinked or blocked. Clear blocked tubing
of slime and debris. Clean inlet and outlet
piping.
Red LED
does not
illuminate.
1. Power source
wiring incorrect.
1. Check power source wiring. HOT and
NEUTRAL may be reversed.
2. Factory defect. 2. Return pump to place of purchase if under
warranty.

16
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.
Liberty Pumps
7000 Apple Tree Avenue
Bergen, NY 14416
2235000A ph: 800‑543‑2550
©Liberty Pumps, Inc. 2020 fax: 585‑494‑1839