Rotek RA Series User manual

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MODELS
RA800
RA1500
RA2000
RA3000
RA4500
RA6000
USER’S MANUAL
Reverse Osmosis System
RA Series

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Table of Contents
Introduction 3
Safety 5
Labelling 5
Feedwater specifications 6
System Specifications 7
System Component Identification 8
System Flow Schematic 9
Unpacking and Installation 10
Installation Procedure 11-12
Start up and Operation 13-14
Microprocessor Controller and TDS Readout 15
Troubleshooting 16
Appendix 1 Membrane Cleaning 17-20
Appendix 2 Sample operations log 21
Appendix 3 Sample analysis request format 22
Warranty and Guarantee 23
Notes 24

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Introduction
Your compact commercial Rotek reverse osmosis system is a durable piece of equipment which,
with proper care and maintenance will last for many years. These systems are part of a family
of reverse osmosis units designed for operation with fresh feedwaters having TDS values below
1,500ppm. Models are available with permeate outputs of between 150 and 1,000 litres/hour
as shown in the specification tables.
Common features to these systems include:
≈High pressure stainless steel braided flexible hose lines
≈Flow meters for permeate (treated product) and reject (waste) streams
≈Liquid filled pressure gauges for feedwater pressure and membrane discharge pressure
≈Automatic membrane flush (with feedwater) at start-up and every 24 hours continuous
operation
≈304 grade stainless steel perimeter frame with rubber isolation feet
≈Integrated microprocessor-based controller with display for TDS and system status
≈Feedwater inlet cartridge filter
≈Feedwater inlet solenoid valve
≈Low feedwater pressure sensor with automatic shutdown
≈High pressure SS membrane pressure vessels
≈High performance, low pressure membranes
≈Adjustable pressure regulating valve

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Options are available for:
≈Reject recirculation to recirculate some of the waste stream and improve recovery rates
≈CIP provision for semi-automated membrane cleaning
≈CIP station to simplify membrane cleaning
≈Chemical dosing systems for automation of pre-treatment
≈Automatic backwash sediment removal filters
≈Automatic backwash carbon and de-chlorination systems
≈Automatic water softeners for mineral hardness reduction.
≈415VAC 3 phase power operation
This User’s Manual outlines installation, operating, maintenance, and troubleshooting details
vital to the reliable performance of your system.
The systems are designed to operate at pressures between 760 and 1520 kPa (110-220psig)
unless otherwise stated. The expected recovery rate with fresh feedwater below 1,500ppm
TDS is between 15%-75%. Lower TDS feedwaters will allow higher recovery rates without a
significant deterioration in membrane performance of operating life. A reject recirculation
facility is available to improve system, recovery rates should feedwater quality permit this.
A current and comprehensive feedwater analysis is essential and should be obtained prior to
system commissioning. This will assist in selecting the correct pre-treatment, chemical dosing
and RO membrane selection. A typical water analysis of what is required is shown in the
Appendix.
If your system is re-adjusted on-site after commissioning, or if the feed water quality changes,
please contact your local dealer or distributor to determine the revised operating conditions
and recommendations for conversion efficiencies to best suit these new conditions.
NOTE: In order to maintain any warranty, an operating log must be maintained as per the
included sample sheet. Copies must be sent to your local dealer or distributor for review.
NOTE: Prior to operating or servicing this system, this User’s Manual must be read and fully
understood. Keep this manual and other associated information for future reference and for
new operators or qualified personnel who may use the system at a future date.

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Safety
The Safety section of this User’s Manual outlines the various safety headings used throughout
this manual as shown below:
NOTE: Indicates statements that provide further information and clarification.
CAUTION: Indicates statements that are used to identify conditions or practices that could
result in equipment or other property damage.
WARNING: Indicates statements that are used to identify conditions or practices that could
result in injury or loss of life. FAILURE TO FOLLOW WARNINGS COULD RESULT IN SERIOUS
INJURY OR EVEN DEATH.
All electrical works should be performed by a licensed electrician and conform to all relevant
electrical safety regulations
All plumbing works should be performed by a licensed plumber and conform to relevant
plumbing codes.
Labelling
Do not under any circumstances remove any Caution, Warning, or other descriptive label from
the system.

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Feed Water Specifications
General Feed Water Requirements
Feedwater quality, pressures and flow rates have a significant impact on the performance of
any reverse osmosis system. To ensure reliable and consistent long-term performance, it is
important to supply feed water having the minimum specifications detailed below. If your
feedwater supply is marginal, you should consider using a feedwater break tank and booster
pump to supply the system.
FEED WATER SPECIFICATIONS (minimum)
Hardness
<1 ppm
Hydrogen Sulphide
0 ppm
Free Chlorine
0 ppm
Manganese
<0.05 ppm
Total Dissolved Solids
<1,500 ppm
Organics
<1 ppm
Turbidity (SDI)
<5
Temperature
+5 to +40°C
pH
3-11
Silica
<1.0 ppm
Iron
<0.01 ppm
Pressure
>300 kPa
These specifications should be met in order to have the reverse osmosis system perform
optimally. All operation specifications are based on the test conditions listed below.
RO OPERATION SPECIFICATIONS
Min. Working Pressure
240kPa (35 psi)
Max. Pressure
1700 kPa (250 psi)
Min. NaCl % Rejection
96%
Max. NaCl % Rejection
99%
Min. Feed (lpm)
5
Max. Feed (lpm)
50
Max. Hardness
1.0 ppm
pH Range
3 – 11
Max. TDS
10,000 ppm
Max. Temperature
40°C (105°F)
TEST CONDITIONS: Permeate flow and salt rejection based on 1500 ppm NaCl, 1034kPa
(150psi), 77°F (25°C), pH 6.5-7.0, and recovery of 15%.
NOTE: Higher TDS and/or lower temperatures will reduce the system’s production

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System Specifications
Systems for raw water TDS value below 1,500 ppm
Model RA800 RA1500 RA2000 RA3000 RA4500 RA6000
Permeate Flow
[GPD/LPH]
800 / 150 1500 / 250 2000 / 350 3000/500 4500 / 750 6000 / 1000
Dimensions (LWH) [cm] 60*48*155 60*48*155 60*48*155 69*63*147 69*63*147 69*63*147
Weight (approx.) [kg] 35 62 70 88 94 100
Element Size [in.] 4” x 21” TFC 4” x 40” TFC 4” x 40” TFC 4” x 40” TFC 4” x 40” TFC 4” x 40” TFC
Elements [qty.] 1 1 1 2 3 4
High Pressure Pump Procon Pump
LPE2-11
Multistage
Pump
LPE2-11
Multistage
Pump
LPE2-11
Multistage
Pump
LPE2-11
Multistage
Pump
LPE2-11
Multistage
Pump
Voltage 110V~410V 220V~410V 220V~410V 220V~410V 220V~410V 220V~410V
Hertz 50/60
Operating pressure [kPa] 760-1520 (adjustable)
Pre-filtration (standard) 20" filter housings x 3pcs, 5μm & 1μm PP elements and carbon cartridge
RO Membrane Vessel High pressure SS304 end port type, 2100 kPa (300 PSI) rating
Flow Meters RO permeate and Reject streams (optional for recirculation)
Pressure Gauges Feedwater, membrane discharge (optional for pump discharge)
Electrical controls Micro-processor based, overload breakers, LED indicators, TDS monitor
System Protection Low feedwater pressure sensor, Automatic membrane flush, Inlet feedwater solenoid valve
Power 220-240VAC 50hZ single phase (optional 415VAC 3 phase)
Frame AISI 304 grade stainless steel, electro polished

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System Component Identification
11
10
15
09
14
01
02
03
12 04
05
07
13
08 06
01
02
03
04
05
07
13
06
12
08
11
10
15
09
14
01
02
03
04
05
07
06
12
09
08
11
14
10
15
Front Front
Front
Back Back Back
No.
Component
Part Number
1
Inlet Pressure Gauge
ON/OFF
2
RO Outlet Pressure Gauge
CBMC3T220VHS
3
Power Switch
GP35B25
4
Needle Valve (Concentrate Water Regulator)
GP07B25
5
Permeate Water Flow Meter
SMNV12F
6
Computer Programmed T.D.S. Controller
CMSNPS203
7
Concentrate Water Flow Meter
CSVNC04
8
Low Pressure Protection Switch
P02507
9
Electromagnetic Protection Switch
GF-CRI/CRN
10
Solenoid Valve
CSWHNO
11
Pre-Filters
FRP4040-300
12
RO Membrane + Vessel
GFMDLZB05-CH
13
Rotary Van Pump
GFMDLZB02-CH
14
1HP Motor
HFET2034BL+F0CHO5-20
15
Auto Flush Valve
NC04

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System Flow Schematic
Raw Water Inlet
S
Inlet
Solenoid Valve
20”Pre-Filter
Inlet Pressure
Gauage Low Pressure
Switch
High Pressure
Pump
RO Membrane Module
Neede Valve
Permeate
Flow Meter
Concentrate
Flow Meter
S
Flush
Solenoid Valve
Drain Drain
Product Water Outlet
Recovery Valve
Optional features not shown here include:
•Reject (concentrate) recirculation valve
•Reject recirculation flow meter
•CIP connections
•Chemical dosing connections

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Unpacking and Installation
Packing List
1Reverse Osmosis System
2½” Flexible PE Tubing (5 m)
3Filter Housing Spanner
4Operating Manual
Check that all components are present and in an undamaged condition. If anything is missing
or appears damaged, notify your supplier immediately.
Installation Notes
1Before installation, check that the power supply available matches the power requirements
of the system. Most units are supplied as standard for 220-240VAC 50Hz single phase
operation. Options are available for 415V AC 3 phase power.
2Ensure that all plumbing connections for the feed water inlet, permeate, concentrate and
membrane flush outlets are secure and conform to relevant plumbing regulations.
3Ensure that power lead is rated to carry the current draw of the system. A minimum
electrical wire diameter of 3.5mm is recommended.
4The external storage tank level contact switch should be connected to the blue wires
labelled for tank connection and located inside the electrical cabinet. Do not apply power to
these wires as the connection is designed for a simple non-powered contact type closure
switch only.
5Use an external pressure booster pump if the feedwater pressure is below 150kPa.
6If your feedwater supply is marginal, use a feedwater storage tank and booster pump to
supply the RO system and prevent system cycling.