Reo-Pure LP3 Series User manual

LP3$350'Owner’s'Manual'|''
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LP3350UM$04142016'

LP3$350'Owner’s'Manual'|''
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TABLE OF CONTENTS
Reo-Pure LP3-350 Model
Getting to Know Your Reo-Pure R.O. System
Major Component Diagram............................................................................................................................................2
Introduction
How Reverse Osmosis Works........................................................................................................................................3
Definition of Terms........................................................................................................................................................3
Factors Affecting System Operation and Performance ..................................................................................................3
Systems Specifications
Operating Specifications..................................................................................................................................................4
Feed Water Parameters ....................................................................................................................................................4
Design Test Conditions....................................................................................................................................................4
Design Specifications.......................................................................................................................................................4
Weight & Dimensions......................................................................................................................................................4
Installation Instructions
Unpacking Your Reo-Pure System..................................................................................................................................5
Locate Desirable Installation Site ....................................................................................................................................5
Feed Water Supply Connection .......................................................................................................................................5
Product Water Connection........................................................................................................................................... 5-6
Drain/Reject Water Connection.......................................................................................................................................6
Electrical Connections .....................................................................................................................................................6
Install Filter Cartridges ....................................................................................................................................................6
John Guest Locking Clips ................................................................................................................................................6
Start-Up Procedure
Installation Follow-Up .....................................................................................................................................................7
Pretreatment for the RO System ......................................................................................................................................7
Divert Product Water to Drain.........................................................................................................................................7
Flush the System ..............................................................................................................................................................7
Adjust the System Pressure..............................................................................................................................................7
Check the Inlet Low Pressure Switch ..............................................................................................................................7
Purge the System..............................................................................................................................................................7
Check the Product Water Pressure Switch.......................................................................................................................8
Product Water Connection...............................................................................................................................................8
Final Inspection................................................................................................................................................................8
Routine Maintenance Procedures
Filter Cartridge Installation and Replacement ........................................................................................................... 9-10
System Pressure Switches..............................................................................................................................................11
Servicing the Membrane Element..................................................................................................................................12
Sanitizing the System.....................................................................................................................................................13
Major Components Replacement List ................................................................................................................................. 14
Reo-Pure Optional Features
Automatic Flush Timer .....................................................................................................................................................15
Inline TDS Monitor...........................................................................................................................................................16
Tank Level Float Control Switch........................................................................................................................................17
Reo-Pure System Limited Warranty ................................................................................................................................... 18
System Trouble Shooting ............................................................................................................................................... 19-20
Flow and Electrical Schematics ...................................................................................................................................... 21-22
System Log Sheet ................................................................................................................................................................ 23

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GETTING TO KNOW YOUR REO-PURE R.O. SYSTEM
LP3-350 System with Standard Features
It is important to familiarize yourself with your new Reo-Pure Reverse Osmosis System.
Pictured below is a front and rear view of the system, with the main components identified. These components
will be referenced to throughout the manual. Noting their locaiton will assist you in the startup and maintenance
of the R.O. System.
IMPORTANT!–!This!manual!covers!the!installation,!operation!and!maintenance!of!the!Reo7Pure!LP37350!
Reverse!Osmosis!System.!It!is!important!to!read!this!manual!thoroughly!BEFORE!installing!the!system.!For!
systems! that! are! equipped! with! optional! features,! refer! to! the! appropriate! optional! feature! inserts,!
located!at!the!end!of!the!manual.'

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INTRODUCTION
Your Reo-Pure System has been designed to produce quality
water for a variety of applications. We are confident that you
will find Reo-Pure Systems provide quick and simple
installation, hassle-free maintenance, and years of reliable and
trouble free operation.
Reo-Pure Systems incorporate years of engineering
experience, dedicated workmanship, and quality manufactured
components. Each system is built with pride and is factory
tested for superior performance.
As with all products, the customer has the responsibility to
ensure that the Reo-Pure System is operated under proper
conditions and within design limitations. All installation,
startup and maintenance instructions must be followed
carefully.
HOW REVERSE OSMOSIS WORKS
Reverse osmosis is a separation process in which water is
forced under pressure through a membrane in the opposite
direction from normal. The membrane allows water to pass
through and blocks or hinders the passage of dissolved
substances and suspended particles. This process reduces the
dissolved salts, minerals, and suspended particles, while
improving the taste, odor, and clarity of the water. The process
is further enhanced by allowing the feed water to continuously
pass over the surface of the membrane, sweeping away the
concentrated salts, minerals and suspended particles.
The Reo-Pure membrane element divides the feed water into
two streams: product water (permeate) which is now purer
than before, and is the desired result; and concentrate water
(reject or drain, plus recirculation) which carries the
concentrated dissolved salts, minerals, and suspended particles
that were rejected by the membrane element down the drain.
DEFINITION OF TERMS
Feed Water – The incoming water to be processed by the
Reo-Pure System.
Product Water (Permeate) – The portion of the feed water
that has passed through the membrane element. It is the
desired result of a Reo-Pure System.
Concentrate Water (Reject or drain water, plus
recirculation) – Used to describe the portion of feed water
that has flowed across the membrane (not through), and has
not been converted to product water. This water now contains
a higher concentrate of dissolved solids and may also contain
organic matter and suspended particles rejected by the
membrane. The concentrate is then split into two streams,
reject and recirculation. The recirculated water is mixed with
the feed water on the inlet side of the pump. The reject water
is sent down the drain. This design is used as a way to
minimize the amount of water sent to drain.
Recovery – The percentage of feed water that becomes
product water. The recovery rate is determined by the number
of gallons (or liters) of product water divided by the total
gallons (or liters) of feed water, and multiplied by 100.
Percent Rejection – The percentage of dissolved solids in the
feed water that does not pass through the membrane. The
membrane prevents passage of dissolved solids and other
contaminants into the product water.
Conductivity – The property of a substance to conduct or
transmit electricity. The unit of measure is in mhos and is
commonly used to determine the purity or quality of water. In
the water treatment industry, it is often converted to PPM TDS
(Parts Per Million Total Dissolved Solids).
FACTORS AFFECTING SYSTEM
OPERATION AND PERFORMANCE
Feed Water Temperature – The volume of product water
increases with higher feed water temperatures, and decreases
with lower feed water temperatures. Temperatures below 35°F
could crack the membrane element, and temperatures
exceeding 90°F may cause rapid deterioration. The
recommended range is between 45°F and 90°F.
Feed Water Pressure – The recommended range is between
40 PSI and 85 PSI. This is the most common range of
municipal water supplies.
Hydrolysis – The natural chemical breakdown of membrane
elements when in contact with water. This breakdown is
accelerated when the water temperature is above 90°F, when
the pH is not within the tolerable range, or when hydrogen
sulfide is present. Refer to the System Operating
Specifications section of this manual. Additional pre-treatment
may be required in these cases.
Bacteria – R.O. Systems may be exposed to bacteria if
operated intermittently. Following a prolonged shutdown or
storage period, the system should be sanitized. Refer to the
section in this manual regarding sanitization.
Fouling or Surface Coating of the Membrane Element –
Fouling is a common problem with membrane elements as a
result of salts, hardness, iron, etc. collecting on the membrane
surface. The pores and channels of the membrane element
become plugged reducing the water production rate. Pre-
treatment equipment, such as a water softener, iron filter, or
activated carbon filter will reduce membrane element fouling
and extend its life.

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SYSTEM SPECIFICATIONS
OPERATING SPECIFICATIONS
Production Rates:
350 GPD (1,325 LPD)*
Rejection Rate:
Minimum 95% – Maximum 99%
Low Feed Water Pressure Switch:
System shuts down at 15 PSI decreasing pressure
Product Water Pressure Switch:
System shuts down at 45 PSI ~ System starts at 25 PSI
Electrical:
Standard – 120V, 60Hz, 1Ph (Optional –220V, 50Hz, 1Ph)
Operating Pressure:
100 PSI
*System production may vary depending upon incoming water temperature and chemistry.
FEED WATER PARAMETERS
Systems are designed for use with potable water sources only
Hardness:
Maximum 10 GPG (Over 10 GPG should be softened)
Iron:
Maximum 0.01 PPM (Dissolved Only)
Turbidity:
Maximum 1 NTU
Hydrogen Sulfide:
Must be removed
Chlorine:
Maximum 0.1 PPM
Inlet Feed Water Pressure:
Minimum 40 PSI Maximum 85 PSI
pH Range:
4 to 10
Feed Water TDS:
Consult Reo-Pure Manufacturer if TDS exceeds 2,000 PPM
Temperature:
Minimum 45oF – Maximum 90oF
Max Operating Pressure:
150 PSI
DESIGN TEST CONDITIONS
Operating Pressure:
100 PSI
Feed Water TDS:
500 PPM as NaCI
Design Temperature:
77oF (25oC)
Membrane Element:
TFC Polyamide – 21” High Flux
Design Recovery:
50%
DESIGN SPECIFICATIONS
Operating
Pressure
Inlet
Conn.
Product &
Reject Conn.
Filter
Housing
Membrane
Element
Motor
60 Hz
Pump
100 PSI
3/8" NPTF
3/8" Tube
20" SL
2.5 x 21”
1/3 HP
125 GPH
WEIGHT AND DIMENSIONS
Shipping Dimensions
Installation Dimensions
Wgt
Height
Width
Depth
Height
Width
Depth
Lbs
In
Cm
In
Cm
In
Cm
In
Cm
In
Cm
In
Cm
75
41
104
21
53
19
48
33
84
14
36
16
41

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INSTALLATION INSTRUCTIONS
Reo-Pure RO Systems will operate most efficiently on filtered
water with a pH of less than 6.5, an SDI of 5 or less, and
hardness of less than 10 GPG. If the system is operated with
levels higher than these, other forms of pretreatment may be
necessary.
Feed water must not contain free chlorine, formalin,
quaternary germicides, cationic surfactant, detergents
containing non-ionic surfactant, such as ALL or Triton, or
membrane element cleaners other than those approved for use.
UNPACK YOUR REO-PURE SYSTEM
Reo-Pure Systems are carefully inspected, tested, and
packaged. They are shipped in proper working order and in
excellent condition. Remove the system from the shipping
carton/container and inspect it for signs of concealed damage,
which may have occurred during shipping. If damage has
occurred, immediately contact the delivering carrier and file a
claim for damages.
LOCATE DESIRABLE INSTALLATION SITE
Determine a desirable location for your Reo-Pure system. It
should be positioned on a hard level surface capable of
supporting the entire weight of the system. See SYSTEM
SPECIFICATIONS for approximate weight and dimensions.
FEED WATER SUPPLY CONNECTION
A cold water supply source must be located within close
proximity to the system. This will be the inlet feed water
supply. Feed water pressure must be a minimum of 35 PSI.
The manual feed water shut-off valve was shipped loose with
the system. Wrap the male end of the valve with Teflon tape
and screw it into the sediment pre-filter marked INLET.
Connect the feed water supply source to the 3/8" NPTF shut-
off valve. We recommend using 3/8" pipe, 1/2" OD tubing, or
3/8" hose.
PRODUCT WATER CONNECTION
During the initial start-up procedure, after a membrane
element replacement, or after sanitization of the system, you
will want to divert the product water line to your wastewater
drain. This can be done by either installing a 3-way valve in
the line or by disconnecting the tubing to your storage tank. It
is always important to divert the product water to drain for 30
to 60 minutes of operation, because membrane elements are
treated with preservative solution that should be rinsed free.
(continued on next page)
CAUTION – Do not connect a hot water line
to the Reo-Pure system. Feed water must be a
cold water supply.
IMPORTANT!–!Installation must comply with state and
local plumbing, electrical, and sanitation codes.'
)
IMPORTANT! –
Do not use this system to make drinking
water from non-potable water sources. Do not use the
system on microbiologically unsafe water, or water of
unknown quality without adequate disinfection before or
after the system.

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INSTALLATION INSTRUCTIONS (continued)
If a pressurized storage tank is being used, the system is
equipped with a product water pressure switch, which will
shut the system off when the pressure in the tank reaches 45
PSI. The system will turn on again when the pressure in the
tank decreases to 25 PSI.
If an atmospheric storage tank is being used, a tank level float
control switch and repressurization system (optional features)
will be required to shut the system off and to pump the
product water to your application.
Remove the plug from the product water outlet (marked
PRODUCT) located in the two-way divider at the bottom of
the product water pressure switch. Connect a 3/8" OD product
water line to the marked outlet, but do not connect it to the
storage tank or other dispensing system at this time. There will
be further instructions in the System Start-Up Section
regarding additional steps required, prior to connecting the
storage tank.
DRAIN / REJECT WATER CONNECTION
A wastewater drain must be near the installation site. This will
be your connection for the reject water (drain) which is
carrying a high level of concentrated dissolved salts, minerals,
and suspended particles that were rejected by the membrane
element.
Remove the plug from the drain water outlet (marked
DRAIN) at the bottom of the reject water assembly, located
near the center of the unit. Using 3/8" OD tubing connect this
outlet port to your wastewater drain.
NOTE: We recommend installing an air gap connection
designed to prevent wastewater back flow.
ELECTRICAL CONNECTIONS
A grounded electrical supply of the proper voltage for your
system should be near the installation site. The system will be
damaged if connected to a power source other than the
voltage, phase and hertz specified on the serial number label.
See the wiring diagram at the end of this manual for the
correct power connections.
Every LP3 Series 60Hz, 120V, 1Ph model comes equipped
with an In-Line On/Off Toggle Switch – conveniently located
next to the system pressure switches. Please reference the
wiring diagram at the end of this manual for more information.
Optional 50Hz, 220V, 1Ph Power – If your system was
ordered with the optional 50Hz, 220V, 1Ph feature, you will
need to provide your own electrical plug. Attach the
appropriate plug to the end of the 14-3 cord that is connected
to the Inlet Feed Water Low Pressure Switch.
INSTALL FILTER CARTRIDGES
Please refer to the section titled “Filter Cartridge Installation
and Replacement” in this manual.
JOHN GUEST LOCKING CLIPS
To ensure the highest level of reliability and system longevity,
red locking clips have been installed on all John Guest tubing
connections. This will make the connections more secure and
protect the system from accidental disconnects. Two extra
locking clips have been included with this manual. These
should be attached at the product and drain ports of the
system, after you have made your connections.'
IMPORTANT!–!Installation must comply with state and
local plumbing, electrical, and sanitation codes.'
)
IMPORTANT! –
Prior to the start-up of system, visually
inspect the inlet, drain, and product water connections
completely. Also check to be sure the system is
connected to a properly grounded electrical power supply
with the appropriate voltage, phase, and hertz.
CAUTION – A water softener should not be
allowed to regenerate while the Reo-Pure
System is operating, unless safeguards are
used to be sure the system is shutdown or
operating on an alternate source of softened
water.
CAUTION Connecting the system to a
power source that does not match the system
power rating exactly can damage the system
and void the warranty.
CAUTION – While the On/Off Toggle Switch
may be in the OFF position, the power cord
should still be unplugged for any servicing or
maintenance to the Reo-Pure™ RO System.
'

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START-UP PROCEDURES
INSTALLATION FOLLOW-UP
1.!Visually inspect the water connections.
2.!Be sure filter cartridges have been installed.
3.!Confirm connection to the proper power source.
NOTE: The membrane element(s) will have been installed
in the system during the final testing procedures unless
other arrangements have been made with the
manufacturer.
PRETREATMENT FOR THE RO SYSTEM
A water analysis of your feed water should have been
performed to determine what type of pretreatment may be
required. See Feed Water Parameters for this system before
operating this system.
DIVERT PRODUCT WATER TO THE DRAIN
During the initial start-up of the system, it is important to
divert all of the product water to a wastewater drain for
approximately 30 to 60 minutes. Membrane elements are
treated with a preservative solution and should be thoroughly
rinsed clean before water is retained for use. This can be done
either by installing a 3-way valve in the product water line or
by diverting your product water line to drain. Do not connect
the product water line to a storage tank at this time.
FLUSH THE SYSTEM
Standard System With Manual Flush - Open the inlet feed
water shut-off valve and allow the system to fill with water.
Press the pressure relief button to release the air from the filter
housings, and open the manual flush valve.
Plug the power cord into the wall outlet. The inlet solenoid
valve will open, and the pump will start. When the system is
turned on, the solenoid valve automatically opens. The valve
will close when the system is turned off. The system will only
start with sufficient feed water flow and pressure (minimum
35 PSI). Low inlet feed water flow and low pressure can result
in damage to the system.
Allow the system to run approximately 3 to 5 minutes to bleed
all trapped air and to flush the membrane element. Then, close
the manual flush valve.
System With Optional AutoFlush Feature - If your system is
equipped with the optional Automatic Timed Flush feature,
the manual flush valve will be eliminated. In place of the
manual flush valve is a Flush solenoid valve. The solenoid is
wired to the electrical enclosure and is pre-set so that a one-
minute flush will occur every time the system goes into
operation. A one-minute flush will also occur every 2 hours
the system runs constant.
Open the inlet feed water shut-off valve and allow the system
to fill with water. Press the pressure relief button to release the
air from the filter housings. Plug the power cord into the wall
outlet and the system will start with a one-minute automatic
flush. You may want to repeat this step to insure the
membrane element is thoroughly rinsed. After the flush cycle
has stopped, proceed to the next step.
ADJUST THE SYSTEM OPERATING PRESSURE
Adjust the system pressure regulator so that the system
pressure gauge reads 100 PSI. Turn the pressure regulator
clockwise to increase the pressure, and counterclockwise to
decrease the pressure.
This Reo-Pure System was designed to operate at 50%
recovery. The gallons per day of product water produced will
vary based on the feed water TDS, feed water temperature,
and the backpressure on the system.
Measure the amount of time in seconds it takes for the system
to produce 1 quart of product water. Use the following
formula to calculate the gallons per day: 21,600 divided by the
seconds it took to produce one quart, equals the gallons per
day.
CHECK THE INLET LOW PRESSURE SWITCH
The inlet feed water low-pressure switch is preset at the
factory. Its purpose is to prevent damage to the system if there
is inadequate feed water flow or pressure.
This step is to verify that it is functioning properly. Slowly
decrease the inlet feed water supply by closing the manual
feed water shut-off valve, while watching the pre-filter outlet
pressure gauge. If the system shuts down when the pressure
drops to approximately 15 PSI, then the inlet pressure switch
is functioning correctly. If it is not functioning correctly, refer
to the Section of this manual on System Pressure Switches.
PURGE THE SYSTEM
Allow the system to operate approximately 30 to 60 minutes
diverting the product water to drain. Once all of the membrane
preservative is flushed from the system, product water may be
retained for use.
(continued on next page)
IMPORTANT MAINTENANCE – Depending on the
quality of your feed water, we recommend the manual
flush valve be opened at least once a week for 3 to 5
minutes to rinse the membrane element.
IMPORTANT – Frequently check the system for any
leaks that may develop.
CAUTION – Never allow the Reo-Pure
system pressure to exceed 150 PSI'

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SYSTEM START-UP PROCEDURES (continued)
CHECK THE PRODUCT WATER PRESSURE SWITCH
If your system is equipped with a product water pressure
switch, it is preset at the factory to shut the system down at 45
PSI, and restart the system at 25 PSI. Its purpose is to stop and
start the system when a pressurized storage tank is used. If the
product water pressure switch is not shutting down the system
when the pressurized storage tank is full, refer to the section in
this manual titled “System Pressure Switches.”
PRODUCT WATER CONNECTION
For convenience, we recommend installing a tank shut-off
valve prior to the pressurized storage tank. The storage tank
may take several hours to fill with product water.
FINAL INSPECTION
Once the above procedures are completed, visually inspect all
water connections. Check to be certain that all connections are
tight and secure.
CAUTION – A water softener should not
be allowed to regenerate while the Reo-Pure
system is operating; unless safeguards are
used to be sure the system is shutdown or
operating on an alternate source of softened
water.
'

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FILTER CARTRIDGE INSTALLATION & REPLACEMENT
FILTER CARTRIDGE INSTALLATION
This Reo-Pure System includes two pre-filter cartridges: the 5-
micron sediment pre-filter cartridge that collects sediment, and
the carbon block pre-filter cartridge that reduces undesirable
tastes, odor and chlorine.
NOTE: The sediment cartridge and the carbon block
cartridge have been packaged separately and will need to
be installed prior to start-up.
1.!Remove the filter cartridges from their packaging.
2.!Remove the filter sumps by turning clockwise.
3.!Place the sediment cartridge over the standpipe in
bottom of the filter sump for the Sediment Pre-
Filter, and place the carbon block cartridge over the
standpipe in bottom of the sump for the Carbon Pre-
Filter. (See diagram at right)
4.!Replace the filter sumps on the filter housing caps,
making sure that the sediment filter is positioned
below the Sediment Pre-Filter label, and the carbon
block filter is positioned below the Carbon Pre-
Filter label. DO NOT OVER TIGHTEN.
NOTE: The membrane element(s) have been installed in
the system during the final testing procedures, unless other
arrangements have been made with the manufacturer.
CHANGING FILTER CARTRIDGES
Filter cartridges have a limited service life and should be
replaced if you experience noticeable changes in product
water taste, color, odor, or flow rate. On average, filter
cartridges should be replaced about every 3-6 months.
Your Reo-Pure System is equipped with pre-filter inlet and
pre-filter outlet pressure gauges. An increase in the pressure
difference of 10-12 PSI between the two gauges is an
indication that the filter cartridge may need to be replaced.
1.!Turn OFF the feed water supply. The Reo-Pure
System will shut down.
2.!Relieve all the pressure from the system by opening
the manual flush valve and pressing the pressure
relief button. If your system is equipped with the
Automatic Timed Flush feature, press the pressure
relief button while the system pressure gradually
decreases.
3.!Disconnect the main power supply
4.!Remove the filter sumps by turning clockwise.
Locate and remove the large o-rings, then wipe them
clean of lubricant and set aside. It is common for the
o-ring to lift out of the sump and stick to the cap. If
the o-ring appears to be damaged or crimped, it
should be replaced.
5.!Remove and discard the used filter cartridges.
6.!Rinse out the bottom of each sump and fill about 1/3
full of water. Add about two tablespoons of bleach
and scrub the cap and housing with a non-abrasive
cloth. Observe the precautions printed on the bleach
container. Rinse thoroughly. 
7.!Lubricate o-rings with a food grade silicone or
glycerin. Place o-rings back into the groove in the
sumps and smooth into place with your fingers. This
step is important to ensure a proper watertight seal.
8.!Place the sediment cartridge over the standpipe in
bottom of the filter sump for the Sediment Pre-
Filter, and place the carbon block cartridge over the
standpipe in bottom of the filter sump for the Carbon
Pre-Filter (See diagram above).
(continued on next page)
CAUTION – It is important that the o-ring
be properly seated each time the filter
housing is reassembled or removed. Use
only food grade silicone or glycerin to
lubricate the o-rings. Do not use a
petroleum-based product such as Vaseline.
IMPORTANT: Before performing any maintenance on
your Reo-Pure System, always disconnect the power
supply!

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FILTER CARTRIDGE INSTALLATION & REPLACEMENT (continued)
9.!Replace the filter sumps on the filter housing caps,
making sure the filters in the sumps match the
corresponding label on the bracket above the caps.
DO NOT OVER TIGHTEN.
10.!Turn on the feed water supply and allow the system
to fill with water.
11.!Press the pressure relief button to release the air from
the filter housings.
12.!Open the manual flush valve.
13.!Reconnect the main power supply. The system
should start. If your system has the Automatic Timed
Flush feature, it will perform a one- minute flush at
this time. Repeat if necessary.
14.!Check for leaks.
15.!Flush the system for approximately 3 to 5 minutes
while diverting the product water to the drain.
16.!Close the manual flush valve.
NOTE: The manufacturer of the filter housing
recommends that the filter sump of all plastic housings be
replaced every five years for a clear sump and every ten
years for an opaque sump. Date the bottom of any new or
replacement sump to indicate the next recommended
replacement date.
IMPORTANT – Use sterile procedures when removing
or replacing filters and membrane elements, or when
working with the tubing containing product water.
Contamination can result from bacteria on your hands,
tools, or in the air.

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SYSTEM PRESSURE SWITCHES
INLET LOW PRESSURE SWITCH
System preset to shut down at inlet pressure below 15 psi
An Inlet Low Pressure Switch is installed on every Reo-Pure
System. The purpose of this switch is to prevent damage to the
pump and/or motor if there is inadequate feed water flow or
pressure.
1) Verifying Set-Point of Inlet Low Pressure Switch
To verify the setting, slowly decrease the inlet feed water
supply by slowly closing the manual inlet shut-off valve while
watching the pre-filter outlet pressure gauge. If the system
shuts down when the pressure drops to approximately 15 PSI,
then the Inlet Low Pressure Switch is functioning correctly.
2) Adjusting the Inlet Low Pressure Switch Set Point
If it is not set correctly, disconnect the power from the System
and remove the black plastic cover of the pressure switch
labeled “Inlet Low Pressure Switch”. There are two screws for
adjusting the switch settings. Do not adjust the plastic screw.
Turn the brass screw clockwise to increase both the cut-in and
cut-out pressure. Turn it counter clockwise to decrease both
the cut-in and cut-out pressure. Turn the screw one half turn
only. Temporarily replace the cover, reconnect the power and
recheck the setting. Repeat as required.
3) Identifying a Broken Low Pressure Switch
Simply, close the inlet feed water valve, and if the System
does not shut down, the pressure switch needs replacing.
PRODUCT WATER PRESSURE SWITCH
System preset to cut-out at 45 psi and cut-in at 25 psi
A Product Water Pressure Switch is a standard feature on Reo-
Pure LP3 R.O. Systems. Its purpose is to stop and start the
R.O. system when a pressurized storage tank is used.
1) Verifying Set-Point of Product Water Pressure Switch
You will need a ball valve and pressure gauge (0-100 psi)
assembly with a tube connection the size of the R.O. system
product tubing. You will also need a container to catch the
product water.
Disconnect the power from the System. Close the pressurized
storage tank shut-off valve. Open a valve down stream of the
pressurized storage tank to relieve the pressure from the
system. Disconnect the tubing from the tank shut-off valve.
Connect the ball valve/pressure gauge assembly to this tubing.
Open the ball valve and put it into the container. Close the
down stream valve. Reconnect the power to the R.O. system.
Slowly close the new ball valve. If the R.O. system shuts
down when the pressure gauge reaches approximately 45 PSI,
the Product Water Pressure Switch is functioning correctly.
2) Adjusting the Product Water Pressure Switch
If it is not set correctly, disconnect the power to the R.O.
system and remove the black plastic cover of the pressure
switch labeled “Product Water Pressure Switch”. There are
two screws for adjusting the switch settings. Do not adjust
the plastic screw. Turn the brass screw clockwise to increase
both the cut-in and cut-out pressure. Turn it counter clockwise
to decrease both the cut-in and cut-out pressure. Turn the
screw one half turn only. Temporarily replace the cover,
reconnect the power and recheck the setting. Repeat as
required. When the Product Water Pressure Switch is set,
reinstall the cover and tighten the locking screw. Disconnect
the power, remove the ball valve or ball valve/pressure gauge
assembly, reconnect the System and open the tank shut-off
valve.
3) Identifying a Broken Product Water Pressure Switch
If the system does not shut down when the pressurized storage
tank is full, the Product Water Pressure Switch needs
replacing.
CAUTION – Disconnect the power any time
the cover is removed from a pressure switch.

LP3$350'Owner’s'Manual'|''
12'
SERVICING THE MEMBRANE ELEMENT
NOTE: Determining how long membrane elements will
last is nearly impossible. Normally, replacement is
necessary whenever the product water production
decreases by 20% at the same operating pressure, or when
the TDS exceeds acceptable level.
MEMBRANE ELEMENT REPLACEMENT
1.!Close the manual feed water shut-off valve.
2.!The Reo-Pure System will automatically shutdown.
3.!Disconnect the main power supply.
4.!Remove the upper clamp from the pressure vessel.
5.!Carefully remove the top end cap from the membrane
pressure vessel.
6.!The membrane element may come with the end cap.
If so, carefully remove it.
7.!Remove the membrane element from the vessel by
pulling on the product water tube. Normally this can
be done by hand. If additional leverage is required,
carefully use pliers.
NOTE: Observe the arrow on the vessel that shows the
direction of flow through the membrane vessel. If the
arrow on the vessel points down, then the brine seal on the
membrane element should be at the top of the vessel.
8.!Check internal and external o-rings on the end caps.
If they are worn or damaged, they will need to be
replaced.
9.!Install the new membrane element in exactly the
same manner as it was removed.
NOTE: The brine seal end must always face the
pressurized feed inlet to the membrane vessel. Please see
illustration for more information.
10.!Insert the top end cap. Be careful to keep the rubber
o-rings in their grooves while inserting the end cap.
Use food grade silicone or glycerin to lubricate the o-
rings. Do not use a petroleum-based product such as
Vaseline.
11.!Replace the upper clamp.
12.!Reconnect the main power supply.
13.!Turn on the feed water supply using the manual inlet
shut-off valve and allow the system to fill with water.
14.!Check for leaks.
15.!Open the reject water valve and flush the system for
2 to 3 minutes.
16.!Close the reject water valve and divert the product
water to drain for 30 to 60 minutes.
17.!After diverting to drain for 30 to 60 minutes, you
may now reconnect the product water line to your
storage tank.
CAUTION – Be sure your product water
line is disconnected from your storage tank
before restarting the system. Divert product
water to drain for 30 to 60 minutes.
IMPORTANT – Divert the product water to drain for
approximately 30 to 60 minutes after changing a
membrane element. This is done because membrane
elements are treated with a preservative solution and
should be thoroughly rinsed clean of any remnants. This
can be done either by installing a 3-way valve in the
product water line, or by disconnecting the pipe or
hose/tube from your storage tank.
IMPORTANT – Before performing any maintenance on
your Reo-Pure System, always disconnect the power
supply!

LP3$350'Owner’s'Manual'|''
13'
SANITIZING THE SYSTEM
The following procedure is recommended for preventive
maintenance. It is not intended to be effective in sanitizing
highly contaminated systems that have been exposed to
excessive amounts of bacteria, or systems that have foul-
smelling membrane elements or filters. Such systems require
extensive cleaning and sanitizing. Consult your Reo-Pure
dealer for further information.
1.!Turn off the feed water supply to the system.
2.!Disconnect the main power supply.
3.!Relieve the pressure from the system by opening the
manual flush valve and pressing the pressure relief
button. If your system is equipped with the
AutoFlush Feature, press the pressure relief button
while the system pressure gradually decreases.
4.!Remove both filter housing sumps by turning
clockwise.
5.!Remove and discard the used filter cartridges.
6.!Rinse out the bottom of each filter sump and fill
about 1/3 full of water. Add about two tablespoons of
household bleach and scrub the cap and sump with a
non-abrasive sponge or cloth. Observe the
precautions printed on the bleach container.
Rinse the filter sumps.
7.!Pour about one tablespoon (two tablespoons if system
has AutoFlush Feature) of bleach into the Sediment
Pre-Filter sump. Reinstall both filter sumps without
the filter cartridges, making sure the o-rings are
seated properly.
NOTE: It is important that the o-ring be properly seated
each time a filter housing is reassembled or removed.
8.!Empty the product water storage tank and
temporarily shut-off the water supply line from the
storage tank to the distribution system.
9.!Reconnect the power supply.
10.!Turn on the feed water supply
11.!Close the manual flush valve. If your system is
equipped with the AutoFlush Feature, a one-
minute flush will occur.
12.!Run the system until the product water tank is full, at
which point the system will shut off automatically.
13.!Turn off the system and let it sit for 8 hours.
14.!Turn off the feed water.
15.!Empty the product water storage tank.
16.!Disconnect the main power supply.
17.!Remove the filter sumps as before. Empty them of all
chlorinated water.
18.!Remove the o-ring from each filter sump and wipe it
clean. Lubricate it with food grade silicone or
glycerin. Place the o-ring back into the groove in the
sump and smooth it into place with your fingers. This
step is important to ensure a proper watertight seal.
19.!Place a new sediment pre-filter cartridge over the
standpipe in the bottom of the sump for the Sediment
Pre-Filter, and place a new carbon block pre-filter
cartridge over the standpipe in the bottom of the
sump for the Carbon Pre-Filter.
20.!Replace the filter housing sumps on the filter housing
caps, by turning counterclockwise – making sure the
filters in the sumps match the corresponding label on
the bracket above the caps. DO NOT OVER
TIGHTEN.
21.!Turn on the feed water supply and allow the system
to fill with water.
22.!Reconnect the power supply.
23.!Run the system until the product water tank is full, at
which point the system will shut off automatically.
24.!Check for leaks.
25.!Thoroughly flush the system of any residual chlorine
by emptying the product water storage tank again and
repeating the prior steps.
26.!After the system and the storage tank have been
thoroughly rinsed of any residual chlorine, you may
reconnect your distribution system to the storage
tank.
NOTE: The ONLY time the membrane element should
come into contact with chlorine is during this procedure.
If the product water storage tank is heavily contaminated, it
will need to be sanitized separately.
IMPORTANT – Before performing any maintenance on
your Reo-Pure System, always disconnect the main power
supply!

LP3$350'Owner’s'Manual'|''
14'
LP3350RPL-04142016
Replacement Parts List
LP3-350
120V/60Hz & 220V/50Hz Models
MEMBRANE PRESSURE VESSEL
PART NO.
DESCRIPTION
QTY
100025212
Membrane Pressure Vessel Assembly GL
S/S 2.5” x 21"
1
100021212
Cap for 2.5” S/S Vessel, 2 Port s (1/4”), with
o-ring
2
1300116
External O-ring for 2.5” S/S Vessel Cap
4
1300209
Internal O-ring for 2.5” S/S Vessel Cap
4
MEMBRANE ELEMENT
PART NO.
DESCRIPTION
QTY
60225210
Membrane Element 2.5" x 21"
1
FILTER HOUSINGS & CARTRIDGES
PART NO.
DESCRIPTION
QTY
22158128-1
#20 Slim Line Housing 3/8" Blue with
pressure relief, D&T outlet side
1
22158129-1
#20 Slim Line Housing 3/8" Blue without
pressure relief, D&T inlet side
1
14815508
Pre-Filter 20" 5-Micron Sediment Cartridge
1
149252010
Pre-Filter 20" 10-Micron Carbon Block
Cartridge
1
PUMPS & MOTORS
PART NO.
DESCRIPTION
QTY
3033501
Pump, Rotary Vane, Brass, 125 GPH,
3/8” NPT, with Clamp
1
3033511
Pump, Rotary Vane, Stainless Steel, 125 GPH,
3/8” NPT, with Clamp (Optional)
1
3011113
V-Band Clamp for Pump (Replacement Only)
1
3100337
Motor, 1/3 HP, 115/230V, 50/60Hz, 1Ph – for
120V & 220V Systems
1
SOLENOID VALVES
PART NO.
DESCRIPTION
QTY
009014120E
Inlet Solenoid Valve w/Coil, 1/4", Brass,
115V/60Hz – for 120V Systems
1
009014120E
Auto Flush Solenoid Valve w/Coil, 1/4",
Brass, 115V/60Hz – for 120V Systems
(Optional)
1
009014220E
Inlet Solenoid Valve w/ coil, 1/4”, Brass,
220V/60Hz – for 220V Systems (Optional)
1
009014220E
Auto Flush Solenoid Valve w/ coil, 1/4”,
Brass, 220V/60Hz – for 220V Systems
(Optional)
1
MISCELLANEOUS
PART NO.
DESCRIPTION
QTY
4438
Check Valve, Product Water, 3/8", JG
1
4934676
Flow Control Adapter, 1/4"
1
4931322
Flow Control Body, 1/4"
1
491634
Flow Control Orifice Plate
1
4934067
Flow Control Screen, 1/4"
1
71035984
Flow Control Washer
3
008012
Gauge, Pressure, Inlet & Filter, 0-100 psi, 2",
Bottom Mount, Liquid Filled
2
008013
Gauge, Pressure, System Operating, 0-300
psi, 2.5", Panel Mount, Liquid Filled
1
3140255
Inlet Manual Feed Shut-Off Valve, 3/8”
1
31402546
Manual Flush Ball Valve, 1/4" NPTF x 1/4"
NPTM, Brass
1
1720114
Pressure Regulator, System Operating, 1/4"
In, 1/8" Out
1
17506902
Pressure Switch, Low Level Cut-Out
1
17506905
Pressure Switch, Product Water
1
075019
TDS Monitor, In-Line (Optional)
1

LP3$350'Owner’s'Manual'|''
15'
AUTOMATIC FLUSH TIMER (optional feature)
If your Reo-Pure System was equipped with an optional Auto
Flush Timer, then the manual flush valve will be eliminated. In
place of the manual flush valve is an Auto Flush Solenoid Valve.
The solenoid is wired to the electrical enclosure and is pre-set so
that a one-minute flush will occur every time the system goes into
operation. A one-minute flush will also occur every two hours
while the system is in operation.

LP3$350'Owner’s'Manual'|''
16'
INLINE TDS TEST MONITOR (optional feature)
THE INLINE TDS TEST MONITOR
The INLINE TDS TEST MONITOR takes the guesswork out
of determining system-servicing requirements. By pressing a
button, owners may determine if their system is effectively
reducing dissolved solids in the water. If dissolved solids rise
above acceptable limits, a red light indicates that service is
required.
NOTE: The monitor measures the conductivity of the
product water. It will not detect the presence of organic
contaminants
INSTALLING THE TDS MONITOR PROBE
1.!Locate the 3/8" tubing to the faucet. Cut the tube
approximately midway with a sharp knife or razor
blade.
2.!Position the tee connector between the cut tubing and
firmly insert the tubing into either side of the tee
connector.
3.!Locate the black cable included with the Monitor Kit.
Insert the probe end into the center of the tee
connector.
4.!Remove the screw on the back of the TDS monitor
and remove the back cover.
5.!Unwrap and install the 9-volt battery (included) and
connect battery to the battery plug.
6.!Locate the eight-position selector switch inside of the
box. Each position corresponds to a specific TDS
setting (See Chart).
7.!Push the desired switch setting to “ON”. Only one
switch should be set to “ON”.
Definitions:
•!TDS - Total Dissolved Solids
•!PPM - Parts Per Million
The Inline TDS Test Monitor should be set based upon raw
(feed) water characteristics and expected system performance.
For Example: Your municipal water supply has a TDS rating
of 200 PPM. You expect to reduce that rating to
approximately 10-30 PPM. You would then set the TDS Meter
to alert you if the TDS reading was to reach 50 PPM or above.
To do so you would set dipswitch 1 to the on position.
SELECTING THE PROPER TDS SETTING
RAW
WATER
TDS
PRODUCT WATER
TDS AT 85%-95%
REJECTION
SUGGESTED
ALERT SETTING
(PPM)*
DIP
SWITCH
NUMBER
100 PPM
5-15 PPM
50
1
200 PPM
10-30 PPM
50/75/100
1, 2, or 3
300 PPM
15-45 PPM
75/100
2 or 3
400 PPM
20-60 PM
100/150/200
3, 4, or 5
500 PPM
25-75 PPM
100/150/200
3, 4, or 5
600 PPM
30-90 PPM
150/200/250/300
4, 5, 6, or 7
700 PPM
35-105 PPM
200/250/300
5, 6, or 7
1000 PPM
50-150 PPM
300/500
7 or 8
*Settings may vary according to area and
dealer recommendations.
Switch No.
1
2
3
4
5
6
7
8
Setting PPM
50
75
100
150
200
250
300
500
8.!Replace the back cover and fasten it with the screw.
9.!Place the monitor in an easy access location. The
only limitation is the length of the cable. Affix the
monitor by peeling the tape from the back, then
pressing onto desired mounting surface.
10.!Plug the cable into the socket on the bottom of the
monitor. Bundle the excess cable using the enclosed
tie strap.
OPERATING THE TDS MONITOR
Before operating the TDS Monitor, run at least one cup of
water from the drinking water faucet. To test, press the red
“Push To Check” button on the front of the monitor, and hold
button for three seconds.
If the GREEN light glows, the level of dissolved solids is
below the monitor set point.
The RED light will glow if the level of TDS exceeds the
monitor’s set point. Drain the holding tank completely and
allow it to refill. Then re-test, using the procedure above. If
the Red light continues to glow, the unit may require
servicing, or the membrane element may need to be replaced.
Contact your Reo-Pure Dealer for assistance.
If no light glows, replace the monitor battery. For best results,
replace the 9-volt battery once a year.
CAUTION – Do not cut the tubing at an angle.

LP3$350'Owner’s'Manual'|''
17'
TANK LEVEL FLOAT CONTROL SWITCH (optional feature)
For use with an atmospheric storage tank application
1.!Install Tank Level Float Control Switch in the
atmospheric storage tank using the directions that
came with the Float Switch.
2.!Remove the covers from both the Inlet Low Pressure
Switch and the Product Water Pressure Switch by
loosening the locking screws, tilting the covers away from the screw and lifting them off.
3.!Locate and remove the RED jumper wire between the upper MOTOR terminal on the Inlet Low Pressure Switch and the
upper LINE terminal on the Product Water Pressure Switch.
4.!Remove approximately 6” of the Tank Level Float Control Switch cord jacket.
5.!Loosen the cord grip screw on the cable connector on the Inlet Low Pressure Switch and bring the Tank Level Float
Control Switch cord into the switch along side the power cord.
6.!Connect the BLACK wire from the Tank Level Float Control Switch cord to the upper MOTOR terminal on the inlet Low
Pressure Switch. Pull the WHITE wire from the Tank Level Float Control Switch cord through the chase nipple between
the two switches and connect it to the upper LINE terminal on the Product Water Pressure Switch. The use of #8 x
16/14GA insulated fork terminals is recommended. Securely tighten the terminal screws to insure good connection.
7.!Tighten the cord grip screw on the cable connector on both cords. Reinstall the covers on the pressure switches and
tighten the locking screws.
8.!Connect the power to the Reo-Pure system. Follow the Start-Up procedures found in the Reo-Pure R.O. System
Installation, Operation and Maintenance Manual.
9.!The Tank Level Float Control Switch will now start and stop the Reo-Pure R.O. System based on the level in the
atmospheric storage tank.
CAUTION – DISCONNECT ALL POWER
FROM THE REO-PURE SYSTEM BEFORE
PROCEEDING.

LP3$350'Owner’s'Manual'|''
18'
REO-PURE SYSTEM
LIMITED WARRANTY!
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LP3$350'Owner’s'Manual'|''
19'
REO-PURE LP3-350 SYSTEM TROUBLESHOOTING
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THE(PUMP(
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LOW(OR(NO(
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HIGH(PUMP(
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LOW(OR(NO(
PRODUCT(
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X3$0(!%+=!%=H@)&!
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G$;?#%+$!$.$;$+&!,+)&%..$=!?%0(2%#=!-#!?#,+$!
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X3$0(/!@)$!0%#$!23$+!#$,+)&%..,+F!&3$!$.$;$+&!,+&-!&3$!
3-@),+F1!
(system troubleshooting continued on next page)