Watts Lync WQ-RS User manual

Lync WQ-RS
Commercial Reverse Osmosis Systems
Engineered Solutions
Lync • 425 W Everman Pkway, St. 101 • Fort Worth, TX 76134
USA: T: [phone]
Technical Support • [phone] (ext. 3) • Mon-Fri, 8 am - 5 pm CST
© 2021 LYNC
L- OMM-005_A • 2/23/2022
Disclaimer
The information contained in this manual is subject to change without notice
from Lync, a division of Watts Water Technologies, Inc. Lync makes no
warranty of any kind with respect to this material, including, but not limited to,
implied warranties of merchantability and fitness for a particular application.
Lync is not liable for errors appearing in this manual, nor for incidental or
consequential damages occurring in connection with the furnishing,
performance, or use of these materials.
Installation, Operation and
Maintenance Manual

Lync WQ-RS
Table of Contents
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TABLE OF CONTENTS
Commercial Reverse Osmosis Systems ..................................................................................................1
1. INTRODUCTION...................................................................................................................................3
1.1. Specifications ...........................................................................................................................4
1.2. RO Overview .............................................................................................................................4
1.3. Pretreatment..............................................................................................................................5
2. CONTROLS, INDICATORS, AND COMPONENTS.............................................................................7
2.1. System Components .................................................................................................................7
2.2. Controller Drawing ...................................................................................................................8
3. OPERATION.......................................................................................................................................10
3.1. Installation................................................................................................................................10
3.2. Plumbing Connections.............................................................................................................10
3.3. Electrical Connections.............................................................................................................10
3.4. Startup.....................................................................................................................................11
3.5. Reverse Osmosis Controller Operations and Maintenance....................................................13
4. Replacement Part List ......................................................................................................................31
5. Membrane Replacement...................................................................................................................32
6. Appendix............................................................................................................................................33

Lync WQ-RS
SECTION 1: INTRODUCTION
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1. INTRODUCTION
WARNING!
Do not use with water that is microbiologically unsafe or of unknown quality without adequate
disinfection before or after the system.
•Pretreatment must be sufficient to eliminate chemicals that would attack the membrane
materials.
•Always turn off the unit, shut off the feed water, and disconnect the electrical power
when working on the unit.
•Never allow the pump to run dry.
•Never start the pump with the reject valve closed.
•Never allow the unit to freeze or operate with a feed water temperature above 100°F
•Save manual for future reference.
•Please refer to Section 6 of this manual for operating parameters according to your
specific feed water Silt Density Index (SDI). For all other settings according to your
specific feed water quality, please contact your Lync representative. A chemical analysis
of the feed water should be conducted prior to the initial sizing and selection of this
system.
NOTES:
Changes in operating variables are beyond the control of Lync. The end user is responsible
for the safe operation of this equipment.
The suitability of the product water for any specific application is the responsibility of the end
user.
Successful long-term performance of an RO system depends on proper operation and
maintenance of the system. This includes the initial system startup and operational startups
and shutdowns.
Prevention of fouling or scaling of the membranes is not only a matter of system design, but
also a matter of proper operation. Record keeping and data normalization are required in
order to know the actual system performance and to enable corrective measures when
necessary. Complete and accurate records are also required in case of a system
performance warranty claim.
Changes in the operating parameters of an RO system can be caused by changes in the
feed water or can be a sign of trouble. Maintaining an operation and maintenance log is
crucial in diagnosing and preventing system problems. For your reference, a typical log sheet
is included in this manual.

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SECTION 1: INTRODUCTION
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1.1. Specifications
WQRS-005-R
WQ-RS-010-R
WQ-RS-015-R
Productivity (gallons per day / gallons per
minute)
3600 / 2.5
7200 / 5.0
10800 / 7.5
Quality (typical membrane percent
rejection)
98 %
% Recovery (adjustable)
25 - 75 %
42 - 75 %
50 - 75 %
Membrane Size
4”x 40”
Number Of Membranes Per Vessel
1
Pressure Vessel Array
1:1
1:1:1:1
1:1:1:1:1:1
Number Of Membranes
2
4
6
Prefilter (system ships with one 5 micron
cartridge)
20" BB
Feed Water Connection
1" NPT
Product Water Connection
3⁄4" NPT
Reject Water Connection
3⁄4" NPT
Feed Water Required (at 50% recovery)
5 gpm
10 gpm
15 gpm
Feed Water Pressure (minimum)
20 psi
Drain Required (maximum)
15 gpm
Electrical Requirement 230 VAC, 3-ph, 60
Hz (other voltages available)
230 VAC, 3-phase, 60 Hz, 15 amps
(other voltages available)
TEFC Motor (horse power)
5
Dimensions L x W x H (inches)
51” x 18” x 57”
Shipping Weight (estimated pounds)
400
600
800
NOTE:
For allother guidelineinformation,pleasecontactyour Lync representative.Published
maximum production rates are based onafeedwaterof 77°F,SDI of less than 3, 1000 ppm
TDS, and pH 8. Individual membrane productivity may vary (±15%). May be operated on other
feed waters with reducedcapacity. Percentrejectionis basedonmembranemanufacturer’s
specifications;overallsystempercentrejectionmaybeless.
1.2. RO Overview
Reverseosmosissystemsutilizesemipermeablemembraneelementstoseparatethefeedwater
intotwostreams.Thepressurizedfeedwater is separated into purified (product) water and
concentrate(reject) water. Theimpurities contained in the feed water are carried to drain bythe
reject water. It is critical to maintain adequate reject flow in order to prevent membrane scaling
and/or fouling.

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SECTION 1: INTRODUCTION
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Figure 1-1 RO Membrane
1.3. Pretreatment
The RO feed water must be pretreated in order to prevent membrane damage and/or fouling.
Table below shows the feed water chemistry requirements.
pH
6 to 9
Hardness (maximum)
Less than 1 grain per gallon as CaCO3 (Softened) or anti scale
chemical injection if not softened (contact your Lync representative)
Water Pressure
20 –90 psi
Temperature
35 - 100°F (2 - 38°C)
Free Chlorine
None allowed
Iron (maximum)
0.1 ppm
Manganese
0.05 ppm
Oil and H2S
None Allowed
Turbidity
Less than 1.0 NTU
Silt Density Index (SDI)
Less than 5.0 SDI
Proper pretreatment is essential for reliable operation of any RO system. Pretreatment
requirements vary depending on the nature of the feed water. Pretreatment equipment is sold
separately. The most common forms of pretreatment are described below.
Media Filter - Used to remove large suspended solids (sediment) from the feed water.
Backwashing the media removes the trapped particles. Backwash can be initiated by time or
differential pressure.
Water Softener - Used to remove calcium and magnesium from the feed water in order to
prevent hardness scaling. The potential for hardness scaling is predicted by the Langelier
Saturation Index (LSI). The LSI should be zero or negative throughout the unit unless
approved antiscalants are used. Softening is the preferred method of controlling hardness scale.
Carbon Filter - Used to remove chlorine and organics from the feed water. Free chlorine will
cause rapid irreversible damage to the membranes.
The residual free chlorine present in most municipal water supplies will damage the thin film
composite structure of the membranes used in this unit. Carbon filtration or sodium bisulfite
injection should be used to completely remove the free chlorine residual.
Chemical Injection - Typically used to feed antiscalants, coagulant, or bisulfite into the feed
water or to adjust the feed water pH.
Feed Water
Product Water
Reject Water

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SECTION 1: INTRODUCTION
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Prefilter Cartridge - Used to remove smaller suspended solids and trap any particles that may
be generated by the other pretreatment. The cartridge(s) should be replaced when the pressure
drop across the housing increases 5 - 10 psig over the clean cartridge pressure drop. The effect
of suspended solids is measured by the silt density index (SDI) test. An SDI of five (5) or less is
specified by most mem- brane manufacturers and three (3) or less is recommended.
Iron & Manganese - Iron should be removed to less than 0.1 ppm. Manganese should be
removed to less than 0.05 ppm. Special media filters and/or chemical treatment is commonly
used.
pH - The pH is often lowered to reduce the scaling potential.
Silica: Reported on the analysis as SiO2. Silica forms a coating on membrane surfaces when
the concentration exceeds its solubility. Additionally, the solubility is highly pH and temperature
dependent. Silica fouling can be prevented with chemical injection and/or reducing the recovery.

Lync WQ-RS
SECTION 2: CONTROLS, INDICATORS AND COMPONENTS
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2. CONTROLS, INDICATORS, AND COMPONENTS
2.1. System Components
Figure 2-1 General System Component Identification
A. Controller - Controls the operation of the system and displays the product water quality.
B. Reject Control Valve - Controls the amount of reject flow.
C. Reject Recycle Control Valve –Controls the amount of reject recycle flow.
D. Pump Discharge Valve - Used to throttle the pump.
E. Prefilter Pressure Gauges - Indicates the inlet and outlet pressure of the prefilter. The
difference between these two gauges is the prefilter differential pressure.
F. Pump Discharge Pressure Gauge - Indicates the pump dis- charge pressure.
G. Reject Pressure Gauge - Indicates the reject pressure.
H. Reject Flow Meter - Indicates the reject flow rate in gallons per minute (gpm).
I. Product Flow Meter - Indicates the product flow rate in gallons per minute (gpm).
J. Reject Recycle Flow Meter –Indicates the reject recycle flow rate in gallons per minute
(gpm).
K. Prefilter Housing - Contains the RO prefilter.
L. Automatic Inlet Valve - Opens when pump is on and closes when the pump is off.
M. Low Pressure Switch - Sends a signal to the controller if the pump suction pressure is low.
N. RO Feed Pump - Pressurizes the RO feed water.
O. RO Membrane Vessels - Contains the RO membranes.

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SECTION 2: CONTROLS, INDICATORS AND COMPONENTS
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2.2. Controller Drawing
Figure 2-2 Controller

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SECTION 2: CONTROLS, INDICATORS AND COMPONENTS
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Figure 2-3 Controller (Continued)
RO PUMP

Lync WQ-RS
SECTION 3: OPERATION
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3. OPERATION
3.1. Installation
1. The water supply should be sufficient to provide a minimum of 20 psig pressure at the design
feed flow.
2. Proper pretreatment must be determined and installed prior to the RO system.
3. A fused high voltage disconnect switch located within 10 feet of the unit is recommended.
This disconnect is not provided with the RO system.
4. Responsibility for meeting local electrical and plumbing codes lies with the owner /operator.
5. Install indoors in an area protected from freezing. Space allowances for the removal of the
membranes from the pressure vessels should be provided. This system requires 42"
minimum clear space on each side.
3.2. Plumbing Connections
NOTE:
It is the responsibility of the end user to ensure that the installation is done according to local
codes and regulations.
1. Connect the pretreated feed water line to the inlet side of the prefilter housing (Figure 2-1,
item A). A feed water shutoff valve should be located within 10 feet of the system.
2. Temporarily connect the outlet of the product water flow meter to drain (Figure 2-1, item B).
The product water line should never be restricted. Membrane and/or system damage may
occur if the product line is blocked.
3. Connect the outlet of the reject water flow meter to a drain (Figure 2-1, item C). The reject
drain line should never be restricted. Membrane and/or system damage may occur if the
reject drain line is blocked. An air gap must be located between the end of the drain line and
the drain. The use of a standpipe or other open drain satisfies most state and local codes
and allows for visual inspection and sampling.
3.3. Electrical Connections
NOTE:
It is the responsibility of the end user to ensure that the installation is done according to local
codes and regulations.
1. A safety switch or fused disconnect should be installed within 10 feet of the system.
2. Verify that the disconnect switch is de-energized using a voltmeter.
3. Connect the outlet of the disconnect switch to the terminals on top of the motor starter (Figure
2-2). Attach the power supply ground to the chassis ground. It may be necessary to drill a
hole in the enclosure and install a water-tight strain relief or conduit connector. The hole size