Siemens IONPURE VNX50HH-2 Manual

IONPURE®
VNX50HH-2
CEDI
Modules
Operation
&
Maintenance
Manual
IP-MAN-VNX50HH2
June 2009
Manual Covers
Part#:
•IP-VNX50HH-2
10 Technology Drive
Lowell, Massachusetts 01851
Tel:
(
866
)
876-3340 Fax: [phone]

IONPURE ®VNX50HH-2 CEDI Modules
Page 2 IP-MAN-VNX50HH2
TABLE OF CONTENTS
DISCLAIMER STATEMENT 4
PROPRIETARY RIGHTS STATEMENT 4
OPERATING MANUAL REVISION HISTORY 5
1. INTRODUCTION 5
1.1. VNX50HH-2 model module Overview 5
1.2. Using this manual 6
1.3. Installation Precautions 6
1.4. Operating Precautions 6
1.5. Shutdown Precautions 7
2. PRE-INSTALLATION: PREPARATION & REQUIREMENTS 7
2.1. Tools and Equipment 7
2.2. Electrical and Plumbing Connections 8
2.3. Inspect the Module 10
2.4. Operating Requirements 10
2.5. Flow Rates and pressure drops 11
3. VNX MODULE INSTALLATION AND OPERATION 12
3.1. Moving the VNX Module into Place 12
3.2. Water Connection Configuration and Fittings 12
3.3. Electrical Connections 15
4. DETERMINE OPERATING DC CURRENT PRIOR TO STARTUP 16
5. START-UP PROCEDURE 16
5.1. Test interlocks 16
5.2. Notes on Recovery, Silica and Hardness 16
5.3. Startup of VNX-HH modules 17

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6. MAINTENANCE AND TROUBLESHOOTING 18
6.1. General Maintenance Guidelines 18
6.2. Specific Maintenance Guidelines 18
6.3. Cleaning Circumstances 19
6.4. Sanitization Circumstances 19
6.5. Required Cleaning and Sanitizing Equipment 19
6.6. System Preparation for Cleaning or Sanitization 20
6.7. Cleaning and Chemical Sanitization Procedures 21
6.8. Cleaning with 2.0% Hydrochloric Acid (HCl) 22
6.9. Cleaning with 5% Brine + 1% Caustic Solution 24
6.10. Cleaning or Sanitizing with Sodium Percarbonate 25
6.11. Sanitizing with Peracetic Acid 27
7. TROUBLESHOOTING 31
8. SHUTDOWN AND STORAGE 38
8.1. SYSTEM SHUTDOWN 38
8.2. STARTUP AFTER SHUTDOWN 38
APPENDIX A: VNX50HH-2 MODULE SPECIFICATIONS 39
APPENDIX B: VNX50HH LAYOUT & ELEVATION DRAWING B-1 40
APPENDIX B: VNX50-HH - PID DRAWING B-2 41
APPENDIX B: VNX50-HH - ELECTRICAL CONNECTIONS DRAWING B-3 42
APPENDIX C: PORT ADAPTER AND PLUG DRAWINGS 43

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Page 4 IP-MAN-VNX50HH2
DISCLAIMER STATEMENT
The operation and maintenance manual should provide complete and accurate information to meet your
operating and/or service requirements based on the information available at the time of publication. The
information in this manual may not cover all operating details or variations or provide for all conditions in
connection with installation, operation and maintenance. Should questions arise which are not answered
specifically in this manual, contact your water system supplier.
IONPURE reserves the right to make engineering refinements that may not be reflected in these
manuals. The material in these manuals is for informational purposes and is subject to change without
notice.
PROPRIETARY RIGHTS STATEMENT
This manual discloses information in which IONPURE has proprietary rights. Neither receipt nor
possession of this manual confers or transfers any right to the client, and by its retention hereof, the client
acknowledges that it will not reproduce or cause to be reproduced, in whole or in part, any such
information except by written permission from IONPURE. The client shall have the right to use and
disclose to its employees the information contained herein for the purpose of operating and maintaining
the IONPURE equipment, and for no other purpose.
In the event the content of this manual is altered or section/items are omitted during a reproduction, in
whole or in part, and instructions or definitions within the reproduction result in personal injury to those
who follow the altered instructions, the burden of responsibility for personal injury falls solely on the party
who effects the reproduction.
MANUAL USER'S GUIDE
This manual describes the procedures necessary to install, operate, and maintain your IONPURE
Continuous Electrodeionization modules. Please read this manual carefully before installing and
operating your modules. The module warranty may be voided if installation or operation instructions are
not followed correctly.
Notes, Warnings, Cautions are used to attract attention to essential or critical information in a manual.
Warnings and Cautions will appear before the text associated with them, and notes can appear either
before or after associated text.
NOTE: Notes are used to add information, state exceptions, and point out areas that may be of
greater interest or importance.
Cautions indicate a situation that may cause damage or destruction of
equipment or may pose a long term health hazard.
Warnings indicate condition, practices, or procedures which must be
observed to avoid personal injury or fatalities.
IONPURE continually strives to provide safe, efficient, trouble-free equipment using the optimum
technology for your application. If problems should develop, IONPURE's worldwide network of technical
support will be available to provide assistance. For service, sales, parts, or additional manual copies,
please visit the website: www.ionpure.com.

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OPERATING MANUAL REVISION HISTORY
EVENT DATE DESCRIPTION
Original publication August 2009 Operation & Maintenance Manual
1. INTRODUCTION
This section contains the following instructions:
•VNX50HH-2 model module overview - Brief introduction to components and models
•Using this Manual - How to use this Manual
•Precautions - Precautions to prevent personal injury or equipment damage during installation
1.1.VNX50HH-2 model module Overview
VNX50HH-2 modules are designed to be installed in either single or multiple Continuous Deionization
VNX systems. Their compact state-of-the-art design assures ease of installation, maintenance, and
service. Compared to the VNX50-2 the VNX5HH-2 module was designed for higher feed water
hardness tolerance. They are differentiated by a green ‘HH” marking on the vessel of the VNX50HH-
2 module. VNX50HH-2 modules are available in the following size:
Part Number Nominal Flow Description
IP-VNX50HH-2 40 gpm (9.1 m3/h) Single VNX module, VNX type
For more information on the VNX module specifications and flow rates, see Sections 2.2, 5.2 and/or
Appendix A of this Manual.
Figure 1-1: Angle and Side views of VNX50HH-2 Modules

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1.2. Using this manual
Service technicians should review this manual prior to going to the site. It
lists tools and materials needed to install the modules. It also outlines the
site information required to prepare for installation.
NOTE: The warranty may be void if installation or operation instructions contained in this manual are not
followed exactly.
This Manual describes the installation, operation, and routine maintenance of the VNX50HH-2 modules.
It also contains information on basic troubleshooting (Section 7).
IONPURE strongly recommends all users read the entire contents of the manual. If the VNX50HH-2
module is not operating properly after going through the basic troubleshooting exercises, contact your
Local Service Provider.
1.3. Installation Precautions
•DO NOT OPEN THE VNX MODULE. OPENING THE MODULE WILL VOID
THE WARRANTY AND CAUSE IRREVERSIBLE DAMAGE
•During operation, the electrode wiring inside the module junction boxes are at high voltage and
present a shock hazard. THEREFORE, BEFORE TOUCHING THE INSIDE OF THE JUNCTION
BOX, CONFIRM THAT AC POWER HAS FIRST BEEN DISCONNECTED AND LOCKED OUT
ACCORDING TO STANDARD LOCKOUT/TAGOUT PROCEDURES.
•To eliminate the possibility of electric shock, confirm that all GROUND WIRES ARE PROPERLY
CONNECTED. Thoroughly read all the information in this manual before operating the VNX model
modules.
•THE MODULE MUST BE OPERATED ACCORDING TO THE DESIGN SPECIFICATIONS FOR
TEMPERATURE AND HUMIDITY.
•IMPORTANT - Pipe sections prepared for installation must be inspected, and be free of debris from
storage or cutting tool particles. This must be done before installation.
•IMPORTANT - Because VNX modules have narrow flow distribution channels, plugging by particles
can cause permanent damage. Always install pressure gauges, sampling ports, sensors, etc. in tee
fittings. Do not drill or tap into piping. After installing gauges, sampling ports, sensors, etc., always
flush out the piping before connecting to the VNX module to remove any debris.
•Installation of the VNX module must be completed in accordance with the procedures outlined in this
manual. If deviations from the prescribed procedures are deemed necessary to achieve the desired
performance, consult your local Service Provider.
1.4. Operating Precautions
•DO NOT APPLY POWER TO THE VNX MODULE UNTIL PROPER FLOW AND PRESSURE HAVE
FIRST BEEN CHECKED AND VERIFIED.
•Allow for proper inlet and outlet connections. NEVER BLOCK OFF (DEAD-HEAD) ALL OF THE VNX
OUTLET pipe connections. Dead-heading by blocking all outlets can result in over-pressurization,
leading to permanent damage.

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•Do not operate the module under conditions other than those stated in the module manual. The
prescribed feed water and electrical requirements, and flow configurations, must be followed at all
times. If the feed water quality or the product water requirements change, contact the IONPURE
Technical Support department for assistance.
Once every six months:
•Make sure all wiring connections are tight
•Test safety interlocks such as flow switches or connections to upstream equipment
1.5. Shutdown Precautions
•Confirm that the pressure in the unit is relieved until all pressures inside the unit are atmospheric.
(i.e., all pressure gauges should read zero).
•Drain standing water and plug all inlets and outlets.
2. PRE-INSTALLATION: PREPARATION & REQUIREMENTS
This section contains the following pre-installation information:
•Tools and equipment - Tools and equipment needed to install the module
•Module Inspection -Inspecting the VNX module for damage
•Operating conditions -Temperature range, space requirements, electrical connections, feed water
specifications, plumbing and drain requirements
2.1. Tools and Equipment
The following items are required to unpack, position, and install the VNX module:
•Spreader bar mechanism to move the module into place
•Slip joint pliers
•Wire cutters/strippers
•Phillips head screwdriver
Spreader bar
Strapping rated
for at least
1000 lbs (454
kg)

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2.2. Electrical and Plumbing Connections
Electrical
An electrical junction box is included and mounted on the VNX 50HH-2 modules. A single conduit
connection is required through a 7/8” thru hole to provide power to the CEDI module.
The junction box follows DC wire color conventions.
•Red +
•Black –
Figure 2-1: Junction Box End of Module
Inlet and Outlet plumbing connections
Ionpure VNX50HH-2 modules have molded PPO end blocks with
FEMALE connections. There are four (4) necessary custom
ACME thread connection points (for more information see
Connection Drawings in Appendix B:
•Product Inlet (Dilute Feed)
•Product Outlet (Product)
•Reject Inlet (Concentrate Feed)
•Reject Outlet (Reject)
Labels (as shown on the right) are used for port identification.

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Table 2-1: Typical inlet/outlet configurations.
Module Port Locations and Connection Types
Module
Model Connection type Recommended Configuration Inlet/outlet Configuration
VNX50HH-2
PVC included and installed
with module
Polypropylene available as a
separate purchased kit
Same side inlet and outlet
OR
Side inlet opposite side outlet
Product Connection
Reject Connection
NOTE – VNX50HH-2 Modules must be connected with CEDI product water to the Reject inlet (Concentrate inlet)
Available Connection Types
PVC – 1-1/2” Female Socket
PP - 50mm Butt Weld
PVDF – 50mm Butt Weld
Grounding of the module piping
DILUTE IN
DILUTE OUT
FI
PI
CPI
RO
Permeate
CEDI Reject
PIFI
CEDI Product
CONC IN
CONC OUT
PI
Figure 2-2: Depicts the flow diagram for the VNX-HH. Note –
Product water (Dilute out) feeds the Concentrate Inlet.
To avoid the risk of electrical shock, some form of grounding must be used
on any stream where the plumbing is stainless steel or if there are samples
points or instrumentation in close proximity to the module. For sanitary
applications, a grounding cap can be used, Ionpure part number 49/S4501-124, which is actually
a ¾” TC cap with a welded stud to be wired to ground. For non-sanitary applications, a ¼” SS
threaded grounding rod can be used, Ionpure part number ZIVC00160.

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Figure 2-3: Grounding Rod
2.3. Inspect the Module
•Do not uncrate the module prior to moving it into its final location. After uncrating it, inspect it
for any signs of damage. If damage is apparent, immediately notify your Local Service
Provider and the carrier.
2.4. Operating Requirements
In order to operate to specification, the VNX module must have the following conditions present.
If any of these conditions are unmet, do not attempt to install the VNX module without specific
instructions from your Local Service Provider’s Technical Support.
•Operating Environment
The VNX module requires indoor installation out of direct sunlight.
The maximum ambient room temperature should not exceed 113
°F (45° C). The module can tolerate humidity of up to 90%, as long as
condensation does not occur.
•Space Requirements
The physical dimensions of the VNX Module are given in appendix A. In addition to the
size of the module itself, the arrangement of the piping and electrical connections
determine the amount of space the module needs to operate. This arrangement varies
from site to site, depending on the conditions at a particular location.
•Electrical Requirements
The VNX module requires the following power sources. In all cases the cathodes must be
at ground potential.
Table 2-2: Electrical requirements for the VNX Modules
Model Nominal Flow Rate DC Power
VNX50HH-2 40 gpm (9.1 m3/hr) 0-600 VDC, 8 Amps

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•Feed Water Requirements – RO Permeate
Feed water for the VNX module must always meet the specifications outlined in Table 2-3.
In most cases, pre-treating VNX module feed water with reverse osmosis (RO) will bring it
within these specifications. Depending on the conditions, however, some sites may
require additional pretreatment. To determine if additional pretreatment is required,
compare the VNX feed water (RO Permeate) on site with the feed water requirements
listed below.
Table 2-3: Feed Water Requirements for the VNX50HH Modules
Module Model VNX50HH-2
Feed water source RO permeate
Feed water conductivity equivalent
including CO2
*< 40 µS/cm
Silica (SiO2) < 1 ppm
Iron, Manganese, Sulfide < 0.01 ppm
Total chlorine < 0.02 ppm as Cl2
Total Hardness ≤2.0 ppm as CaCO3
Dissolved organics (TOC) < 0.5 ppm
Operating pH range 4 – 11
Operating Temperature 40 - 113 °F (5 – 45 °C)
Inlet pressure <100 psi ( 7 bar)
Note: Recycling the VNX reject to the RO feed will cause the CO2load on the VNX to
increase, and may have an impact on the VNX product water quality. Please refer to
Ionpure.com for additional reject stream system design guidance including the following
paper from Jonathan Wood and Joe Gifford (“Process and System Design for Reliable
Operation of RO/CEDI Systems”)
•Drain Requirements
Place the VNX module near a drain that can accommodate at least 100% of the total feed
flow.
2.5.Flow Rates and pressure drops
•See Appendix A

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3. VNX MODULE INSTALLATION AND OPERATION
This section contains the following installation information:
•Moving and unpacking - Moving the Module into place and unpacking it
•Connecting the Module - Connecting the plumbing and electrical.
3.1. Moving the VNX Module into Place
Confirm that the pre-installation requirements outlined in Section 2 are met and the system is ready
for VNX Module installation.
•Remove any packaging materials and move the module to its operating
location. (See Section 2). Use safe lifting practices when moving the
module.
•Remove the yellow dust plugs that seal the inlet and outlet ports on the
module. Failure to remove yellow dust plugs can cause permanent
damage to the modules.
3.2. Water Connection Configuration and Fittings
Pre-Flushing - Make sure all upstream pretreatment equipment and piping
have been thoroughly flushed with particle-free water before connecting
them to the VNX Module. Flushing removes any particles left in the piping
from cutting and assembly. If particles remain, they could plug the passages inside the
VNX Module.
NOTE - Failure to properly flush the pretreatment water system of installation debris to
drain prior to flowing water to the CEDI can result in particulate fouling that may be
irreversible.
Plug Removal - Remove yellow dust plugs from the
connection ports.
Connections - Ionpure VNX modules have a Molded PPO
endplate with FEMALE ACME thread connections.
Connection adapters and plugs are factory installed into the
female ACME thread ports. There are four (4) necessary
connection points:
•Product Inlet (Dilute Feed)
•Product Outlet (Product)
•Reject Inlet (Concentrate Feed)
•Reject Outlet (Reject)
See Table 2-1 in Section 2.2 for module specific port
locations or refer to the module layout drawings in
appendix B. Connection adapter drawings can be located in appendix C.

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Modules are shipped with the connection ports installed. Product and Reject ports are labeled with color
coded identification (see figure above). Blue Product port inlets (I) and outlets (O) are identified with Blue
labels affixed near the appropriate end block connection points. Red Reject port inlets (I) and outlets (O)
are identified with Red labels affixed near the appropriate end block connection points.
See appendix C for PVC and PP adapter drawings. If alternate approved connection orientations are
required, insure that connections to this type of module INCLUDE THE USE OF O-RINGS. For additional
module specific connection information see appendix B.
•The unit comes with 4 factory installed PVC connection adapters.
•The unit comes with 4 factory installed PVC plugs.
There are several important points regarding the piping connections:
Sealing Mechanism - The seal is created by a dual o-ring between the smooth hole wall of the
end block and the connection adapter. This is similar to an RO end adapter that seals into an RO
pressure vessel end cap. The female threads in the endplate are ACME threads. They are NOT
TAPERED pipe threads and DO NOT CREATE the seal, they allow the sealing surfaces to move
towards each other and hold the piping adapter in place.
Use of Sealants - DO NOT use Teflon® tape or any other pipe sealant (e.g. Dope) on the ACME
thread adapters. The use of these products on the ACME thread adapter will prevent good
sealing.

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O-rings – O-rings are included with the plugs and pipe adapters. Connection adapters use white
O-rings size (2-222) and an orange O-ring size (2-221) and are made of Silicon. The slightly
larger o-ring (white) is 222.
2-221 Oring
2-222 Oring
2-221 Oring
2-222 Oring
Plug PVC Connection Adapter PVC
Piping Adapter Material - To avoid corrosion, the piping adapters and plugs must be non-
metallic. Factory supplied plugs and adapters are made of PVC. Additional high purity adapter
kits are available if required for installation. See Appendix C for the Polypropylene plug/adapter
drawings.
Tightening - Adapters should be tightened to ensure that orings are engaged in the endplate.
The maximum torque necessary to install adapters and plugs will be less than 6 ft-lbs to engage
the oring and ensure a leak free seal.

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3.3.Electrical Connections
Electrical Connections
•VNX modules have on-board electrical
junction boxes and follow common DC
voltage color conventions. Only one
electrical connection is required per
module. Power connections to the module
junction box should be made with 12AWG
(3.31mm2) wire and conduit connections
should be supplied through the 7/8”
junction box thru hole.
DC wire color conventions.
oRed +
oBlack –
Electrical Precautions
•Ensure that polarity of DC connections is
correct before applying DC power.
Operation with polarity reversed will permanently damage the cathode. It is critical that the
red and black wires are correctly oriented on the positive (+) and negative (-) terminal blocks.
•Do not run AC and DC wiring within the same conduit. This may cause interference
and lead to malfunctions.
•Disconnect power before opening any enclosure and follow
accepted Lockout/Tag out procedures when working on the
system.
•All wiring done in the field must conform to local electrical codes. Consult your Local service
Provider if there is a conflict between the instructions in this manual and the local codes.
•Power connections from the modules should be connected to a suitable power supply
capable of meeting the DC power requirements of the module.

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4. DETERMINE OPERATING DC CURRENT PRIOR TO STARTUP
The VNX50HH-2 modules are designed and tested to operate correctly at 8 amps. If the feed water
meets the influent quality requirements for the VNX50HH-2, the current will be set independent of the
Feed Water Conductivity (FCE).
Set the power supply to operate in constant amperage mode and set the
amperage at 8 Amps DC.
Note – This procedure is different from our typical startup amperage calculation that would be calculated
based on the Feed Water Conductivity Equivalent (FCE).
5. START-UP PROCEDURE
5.1. Test interlocks
•Test flow switches and other interlocks, including the RO interlock if applicable
•Test pressure relief if applicable
•Set alarm points
5.2. Notes on Recovery, Silica and Hardness
VNX50HH-2
•VNX recovery of 90% is limited to systems with feed water total hardness of less than 1 ppm
as CaCO3. For systems operating with CEDI feed water hardness from 1 – 2 ppm as CaCO3
the maximum water recovery is limited to 80%. In addition there is a minimum reject flow of
2.6 gpm per VNX modules.
•For normal recovery of 80-90%, feed water silica must be ≤1 ppm as SiO2
Table 5-1: Flow Range
Hardness
(as CaCO3) Recovery Flow
Range Dilute Feed
Gpm [m3/hr]
Concentrate
feed from
Dilute (CEDI
Product)
Gpm [m3/hr]
Net Product
Gpm [m3/hr]
Minimum 25 [5.68] 5 [1.14]
20 [4.54]
Nominal 50 [11.36] 10 [2.27]
40 [9.08]
1-2 ppm 80%
Maximum 62.5 [14.2] 12.5 [2.84] 50 [11.36]
Minimum 25 [5.68] 2.6 [0.59]
22.4 [5.09]
Nominal 50 [11.36] 5 [1.14]
45 [10.22]
<1 ppm 90%
Maximum 62.5 [14.2] 6.2 [1.41]
56.3 [12.79]

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100
RateFlowFee
d
RateFlowProduct
Recovery% ×= 100
Recovery% RateFlowProduct
RateFlowFeed ×=
5.3. Startup of VNX-HH modules
•Make sure that modules are correctly connected to the DC power source.
•Make sure that the VNX product line is directed to drain.
•Turn on the feed water. Adjust valves to obtain the desired flows and pressures in the
product and reject streams. The reject flow is set depending on the feed water hardness
level. Section 5.2 examines the necessary flow calculations and flow restrictions for the
VNX50HH-2 Module. Ensure that the piping connections have been established using CEDI
product to feed the concentrate (Reject) inlet.
•Concentrate feed pressure and Dilute Outlet pressure will be equal for the VNX50HH-2
Module due to the concentrate feed requirements. Valves should be adjusted to ensure that
the module is operating with the correct recovery and adjusted to ensure that the product
outlet pressure is about 2-10 psig higher than the reject outlet pressure at the desired flow
rates. See Example Pressure Scenario Below.
25 PSIG
50 PSIG 25 PSIG
Outlet
•Adjust the DC power supply to the current setting of 8 amps. See Section 4 for more details.
•Test all flow switches and interlocks to ensure VNX DC power is shut off when flow is
interrupted.
•Continue to direct the product water to drain until it reaches the desired quality.
•Once product reaches the desired quality, connect to process. Readjust pressures as
required to maintain product outlet pressure 2-10 psi above the reject outlet pressure.
•When the system is at steady state (quality in specification and stable operation), record
operating data on the data sheet provided at the end of section 7.
Dilute
Concentrate
FEED
25 PSIG
FEED
15 PSIG
Dilute Outlet
_ Conc Outlet
15 PSIG 10 PSID
Equation 5-1: Recovery Equations
Outlet
Dilute outlet
compared to the
Concentrate
Outlet

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6. MAINTENANCE AND TROUBLESHOOTING
The following section details the maintenance procedures for the VNX module. It
contains general maintenance information and specific maintenance information
for cleaning and sanitizing the modules.
The cleaning chemical volumes and flows detailed in this section are for a single VNX module. Multiply
chemical volumes by number of modules in system
This section also lists possible problems and troubleshooting procedures for the VNX module. All
operators and personnel involved with the module should read and become familiar with all maintenance
and troubleshooting procedures.
6.1. General Maintenance Guidelines
Operating Data Log Sheet
VNX system log sheets should be filled out daily to provide early detection of problems that could
jeopardize the warranty and potentially damage the module. A typical log sheet is included at the
end of the troubleshooting in Section 7. Because instrumentation may vary depending on the type
of system the module is installed into, this log sheet may not apply to your particular system. The
system manual should contain log sheets more appropriate for your particular system. However,
the items in bold must be filled out to maintain module warranty.
Periodic Maintenance
Perform the following tests at least once every six months. Check the Troubleshooting portion in
Section 7 for any recommendations that are not listed below.
•Check for any water leakage from the module. If leakage is observed,
see the Troubleshooting subsection for possible solutions.
•Periodically tighten all electrical connections.
6.2. Specific Maintenance Guidelines
Periodically, the VNX module may need cleaning or sanitization. Cleaning the module removes
scale and resin/membrane foulants.
Before starting any cleaning or sanitization procedure, see subsection 6.7
for recommended cleaning solutions
Do not run a cleaning or sanitizing solution through the system with DC
power to the VNX module. Make sure the DC power is off before cleaning.

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6.3. Cleaning Circumstances
The module may need CLEANING if:
•product differential pressure increases by 50% without a change in temperature and flow, or
•reject differential pressure increases by 50% without a change in temperature and flow, or
•product quality declines without a change in temperature, flow, or feed conductivity, or
•the module electrical resistance increases by 25% without a change in temperature.
The above factors may indicate module fouling or scaling. Contact your Local service Provider to
determine if the module needs cleaning or for the best cleaning procedure.
6.4. Sanitization Circumstances
The system may require periodic SANITIZATION if the product water calls for low levels of
bacteria (user specific requirement).
6.5. Required Cleaning and Sanitizing Equipment
The following equipment must be constructed of
material compatible with the recommended cleaning
solutions.
Thoroughly flush all plumbing and other equipment before cleaning or sanitization to remove debris that
might damage the system.
During cleaning, the following equipment is required:
Tank
Connect a tank to the VNX system. The tank should be large enough to accommodate solution
volumes as shown in this section. The cleaning solution will be prepared in this tank.
Pump
Install a cleaning pump between the system and the cleaning tank. The pump must provide a minimum
discharge pressure of at least 30 psig (2 bar) for VNX50-HH installations. For the best results, size
pumps for the maximum possible flow up to the values listed in Table 6-1.
The construction materials of the wetted surfaces in the pump must be compatible with the
cleaning solutions. Plastics generally work well with most cleaning chemicals.
During cleaning or chemical sanitization, adjust flow rates as follows to maintain flow velocity in
all spacers (use the highest flow rate possible per Table 6-1):
Table 6-1: Cleaning Flow Rates
VNX50-HH
min – max
Product Flow 25-50 gpm (5.7 -11.4 m3/hr)
Dilute Flow 30-75 gpm (6.8 – 17 m3/hr)
Reject Flow
Calculation 0.5 x Product Flow
Reject Flow 5-25 gpm (1.14 - 5.7 m3/hr)
Pump Capacity 30-75 gpm (5.7 - 17 m3/hr)

IONPURE ®VNX50HH-2 CEDI Modules
Page 20 IP-MAN-VNX50HH2
The preferred cleaning flow rates are nominal product flow and reject flow base on the module
reject flow calculations in Table 6-1.
Valves and Hoses
Figure 6-1 shows a typical flow diagram for cleaning or sanitizing a VNX system. Valves are
needed for mixing, cleaning, and draining the tank.
Flexible hose is ideal for connecting cleaning equipment to the system. Verify that the
construction materials of the valves and hose are compatible with the cleaning solutions.
6.6. System Preparation for Cleaning or Sanitization
NOTE: The following cleaning procedures are based on the piping setup shown in Figure 6-1. If
your piping setup is different, you may need to alter these procedures.
•Turn off the DC power supply.
•Close the following valves to the VNX system:
oFeed Valve
oProduct Valve
•Connect the discharge of the cleaning pump to the VNX feed CIP connection.
•Connect the module’s feed, reject and product CIP connections to the cleaning tank.
•Verify that all piping connections are secure.
•Close cleaning pump discharge valve until ready to pump the cleaning solution into the VNX
system.