Liberty Pumps Mini-Split LCU-MS Series User Manual Download Page 1

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 tempera-

tures 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.

“Acceptable For Indoor Use Only” 

“Nonsubmersible Pump” 

“CAUTION” – To reduce risk of electric shock, install with motor and all electrical 

components above the top grade level of the sump. This pump is not submersible. 

“WARNING” 

“Risk Of Electric Shock – This pump has not been investigated for use in swimming pool 

or marine areas.” 

“To reduce risk of electric shock, see instruction manual for proper installation.” 

“To reduce risk of electric shock, connect only to a properly grounded, grounding-type 

receptacle.”

 

“THERMALLY PROTECTED” 

Date of Production: stamped on reservoir. 

“FOR INDOOR USE ONLY” 

”ENCLOSURE TYPE 2” 

  LIMITED WARRANTY

7000 Apple Tree Avenue  Bergen, NY  14416

Phone 800-543-2550   Fax 585-494-1839

www.LibertyPumps.com 

Unit does not run.

Unit makes loud noises even 

after the first dry-running 

phase.

Unit runs but does not pump 

the liquid out properly.

  Check the highest point of the discharge hose 

does not exceed the maximum delivery head of 

the pump.

  Check hose is not clogged or kinked.

  Check the flow rate of the pump is sufficient for 

the condensation volume of air conditioner.

  Check if pump has contact with any hard surfaces. 

If it does, anti-vibration materials should be 

positioned between the pump and all hard 

surfaces.

  Verify there is no siphoning action.

  Check the power supply.

  Check the air conditioner to see if condensation is 

actually being produced.

  Check hose is not clogged or kinked.

Ensure power to the pump is disconnected before performing any service or maintenance.

1)  Clean the reservoir every six months, preferably at the beginning and end of the air 

conditioning season.

 

a)  Open the reservoir cover using the opening latch.

 

b)  Clean the reservoir and float using a solution of water containing 5% bleach.

 

c)  Replace the float in the initial position (magnet facing UP).

 

d)  Reinstall the reservoir cover.

2)  Perform a 

TEST OPERATION

 [see above]. 

  After installation, test pump operation by slowly pouring water into the air conditioner 

drain pan. Repeat this approx. 8–10 times.

  Check for any water leaks, kinked or pinched lines, or siphoning action.

  Clicking noises heard at initial start-up are normal and are usually only heard for the first 

few operations.

  Allow a one minute rest after each cycle to prevent triggering the thermal protector.

CONFORMS TO ANSI/UL STD. 778

CERTIFIED TO CAN/CSA STD. C22.2 NO.108

4007096

  SERVICE & MAINTENANCE

  TEST OPERATION

  TROUBLESHOOTING

  PRODUCT INFORMATION

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LCU-MS Mini-Split Series

USER GUIDE

Read this user guide carefully before attempting to install, operate, or 

service the LCU-MS Mini-Split Series pump. Know the pump application, 

limitations, and potential hazards. Protect yourself and others by observing 

all safety information. Failure to comply with these instructions could result 

in personal injury and/or property damage. Retain this user guide for future 

reference. Installation, connections, and service shall be done only by 

qualified personnel. 

7000 Apple Tree Avenue

Bergen, NY  14416

Phone 800-543-2550

Fax 585-494-1839

www.LibertyPumps.com 

For Air Conditioners up to 7 kW

LCU-MS2

(LCU-MS + DUCTS)

LCU-MS

CEILING

DRAIN PAN

MADE IN SOUTH KOREA

Pump Model #: _____________________________________________
Pump Serial #: ______________________________________________
Install Date: _________________________________________________

 

Keep this manual handy for future reference

 

Retain dated sales receipt for warranty

✔         ✖

2035000A

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