Ion Technologies IT- DS05-S Manual

IONTECH®
IT- DS
EDI Modules
Operation
&
Maintenance
Manual
IT-DS
Sept 2015
Revision 0
Manual Covers
Part#:
IT- DS05-S
IT- DS10-S
IT- DS20-S
IT- DS30-S
IT- DS50-S
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IONTECH ®IT- DS EDI Modules
DISCLAIMER STATEMENT 4
PROPRIETARY RIGHTS STATEMENT 4
OPERATING MANUAL REVISION HISTORY 5
1
1 .1
1 .2
1 .3
1 .4
1 .5
2
2 .1
2 .2
2 .3
2 .4
INTRODUCTION
IT-DS Module Overview
Using this Manual
General Installation Precautions
Operating Precautions
Shutdown Precautions
PRE-INSTALLATION PREPARATION & REQUIREMENTS
Tools and Equipment
Electrical and Plumbing Supplies
Inspect the Module
Operating Requirements
6
6
7
7
9
9
9
9
10
10
10
2.4.1 Operating Environment
2.4.2 Space Requirements
2.4.3 Electrical Requirements
2.4.4 Feed Water Requirements - RO Permeate
2.4.5 Drain Requirements
10
11
11
11
12
2 .5
3
3 .1
3 .2
3 .3
3 .4
Flow Rates and Pressure Drops
IT-DS MODULE INSTALLATION &
OPERATION
Moving the IT-DS Module into Place
Checking Module Torque - First time operation
Connect Plumbing Fittings
Electrical
12
12
12
13
15
16
3.4.1 Electrical Precautions 16
3.4.2 Electrical Connections 16
3.4.3 Determine Operating DC Current Prior to Startup 16
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3 .5 START-UP Procedure 18
3.5.1 Start-up IT-DS module 18
3 .6 Recovery, Silica and Hardness 18
4 MAINTENANCE AND TROUBLESHOOTING 19
4 .1 General Maintenance Guidelines 19
4.1.1 Operating Data Log Sheets 19
4.1.2 Periodic Maintenance 20
4 .2 Specific Maintenance Guidelines 20
4.2.1 Cleaning Circumstances 20
4.2.2 Sanitization Circumstances 20
4.2.3 Required Cleaning and Sanitizing Equipment 21
4.2.4 System Preparation for Cleaning or Sanitization 22
4 .3 Cleaning and Chemical Sanitization Procedures 23
4.3.1 Cleaning with 2.0% Hydrochloric Acid (HCl)
4.3.2 Cleaning with 5% Brine/1% Caustic Solution
4.3.3 Cleaning or Sanitizing with Sodium Percarbonate
4.3.4 Cleaning or Sanitizing with Peracetic Acid
4.3.5 Cleaning and Sanitizing with Multiple Cleaning Agents
24
25
26
29
32
4 .4 Troubleshooting 33
5 SHUTDOWN AND STORAGE 40
5 .1 System Shutdown 40
5 .2 Startup after Shutdown 40
APPENDIX A: IT-DS MODULE SPECIFICATIONS 41
APPENDIX B: JUNCTION BOX ELECTRICAL CONNECTIONS IT-DS 42
APPENDIX C : LAYOUT AND ELEVATION DRAWING IT-DS 43
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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.
IONTECH 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 IONTECH 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 IONTECH.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 IONTECH 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 injuryto
thosewhofollowthealteredinstructions,theburdenofresponsibilityforpersonalinjury falls
solely on the party who affects the reproduction.
MANUAL USER'S GUIDE
This manual describes the procedures necessary to install, operate, and maintain your IONTECH
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.
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OPERATING MANUAL REVISION HISTORY
EVENT DATE DESCRIPTION
Original publication September 2010 Operation & Maintenance Manual
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1 Introduction
This section contains the following instructions:
IT-DS 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
IT-DS Module Overview
IT-DS Modules are designed to be installed in either single module or multiple module Continuous
Deionization IT-DS systems. Their compact state-of-the-art design assures ease of
installation, maintenance, and service. The module sizes are designed in optimal flow
configurations stated below to ensure cost effective water system integration.
Table 1-1: Model numbers and nominal flow rates.
Moduel Number Nominal Flow Description
IT- DS05-S 2 gpm [0.44 m3/hr] Single IT-DS Type – 4 Cell
IT- DS10-S 5 gpm [1.1 m3/hr] Single IT-DS Type – 10 Cell
IT- DS20-S 9 gpm [2.0 m3/hr] Single IT-DS Type – 18 Cell
IT- DS30-S 15 gpm [3.3 m3/hr] Single IT-DS Type – 30 Cell
IT- DS50-S 22.5 gpm [5.1 m3/hr] Single IT-DS Type – 45 Cell
For more information on the IT-DS module specifications and flow rates, see Appendix A of this
Manual.
Figure 1-1 Side View IT-DS Module
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Figure 1-2 Angle View IT-DS module
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 IT-DS Series EDI
modules. It also contains information on basic troubleshooting Section 4.4.
IONTECH strongly recommends all users read the entire contents of the manual. If the IT-DS Series
module is not operating properly after going through the basic troubleshooting exercises, contact your
local service provider.
1.3 General Installation Precautions
CHECKING MODULE TORQUE
IF THE NUTS ON THE THREADED TIE BARS HAVE LOOSENED
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DURING SHIPMENT, THE PRESSURE FROM THE INCOMING
WATER CAN CAUSE PERMANENT DAMAGE. SEE SECTION 3.2
BOLT TORQUE MUST BE CHECKED AND THE MODULE TIGHTENED AS
REQUIRED BEFORE FLOWING WATER INTO THE MODULE.
REFERRING TO FIGURE 3-1 AND TABLE 3-1, TIGHTEN AS
REQUIRED. NOT ALL MODULES WILL NEED TIGHTENING.
OPERATIONAL LOG SHEETS ARE NECESSARY TO ENSURE
CONSISTENT OPERATION, DETERMINE CLEANING REGIMENS,
TROUBLESHOOTING AND AS A REQUIREMENT FOR MODULE
WARRANTY.
DO NOT OPEN THE IT-DS MODULE. OPENING THE MODULE WILL VOID
THE WARRANTY AND DO IRREVERSIBLE DAMAGE
THE MODULE MUST BE OPERATED INSIDE ITS DESIGN
SPECIFICATIONS FOR TEMPERATURE AND HUMIDITY. SEE
SECTION 2.4.1
IMPORTANT - PIPE SECTIONS PREPARED FOR INSTALLATION
MUST BE INSPECTED, AND BE FREE OF DEBRIS FROM STORAGE
OR CUTTING TOOL PARTICLES. THE FEED WATER SYSTEM
SHOULD BE THOROUGHLY RINSED TO ENSURE THAT
PARTICULATES AND CONSTRUCTION DEBRIS ARE REMOVED
FROM THE FEED WATER SYSTEM
IT-DS MODULES HAVE NARROW FLOW DISTRIBUTION
CHANNELS THAT CAN BECOME PLUGGED BY PARTICLES
CAUSING 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 IT-DS MODULE TO REMOVE ANY
DEBRIS.
DURING OPERATION, THE ELECTRODE WIRING INSIDE THE
MODULE JUNCTION BOXES ARE AT HIGH VOLTAGE AND PRESENT A
SHOCK HAZARD.
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 IT-DS MODULE.
Keep the top of the unit clear of tools, nuts, screws, etc. to prevent these items from
damaging the unit.
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Installation of the IT-DS 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 IT-DS MODULE UNTIL PROPER FLOW
AND PRESSURE HAVE FIRST BEEN CHECKED AND VERIFIED. Irreparable
damage may result.
NEVER BLOCK OFF (DEAD-HEAD) ANY OF THE IT-DS OUTLETS. Dead-
heading the outlets can result in over-pressurization, leading to
permanent damage.
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
IONTECH 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 to ensure that module internals can
not dry out.
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 IT-DS module for damage
Operating conditions - Temperature range, space requirements, electrical connections,
feed water specifications, plumbing and drain requirements
2.1 Tools and Equipment
Dolly or fork lift for moving module into place
Cords, cables or straps to secure to dolly or fork lift
Wire cutters/strippers
Adjustable torque wrench with 10-50 ft-lbs. (14-68 N-m) range, 3/8" (10 mm) drive
19 mm extra deep socket (IONTECH part number IP-IT-DSSOCKET)
19 mm open end wrench
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Screwdrivers (flat blade and Phillips head)
IT-DS module handles for moving & positioning unit (IONTECH part number
IT-DSHANDLES)
2.2 Electrical and Plumbing Supplies
The amounts, sizes, and types of these supplies will vary from site to site. Check before hand to
determine the site needs.
Conduit, wires and appropriate conduit connectors to run the DC power and ground from
the DC power controller to the module. Size wire in accordance with local electrical code.
Fittings to connect the 1 1/4" and 3/4" BSPM ports on the module to the module
plumbing.
Grounding Module Piping - 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, IONTECH part number 49/S4501-124, which is actually a 3/4"
TC cap with a welded stud to be wired to ground. For non-sanitary
applications, a 1/4" SS threaded grounding rod can be used, IONTECH
part number ZIVC00160 see Figure 2-1.
Figure 2-1 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 possible 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, IT-DS modules must have the following conditions present. If any
of these conditions are unmet, do not attempt to install IT-DS modules without specific instructions
from your Local Service Provider Technical Support.
2.4.1 Operating Environment
IT-DS modules require 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.
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2.4.2 Space Requirements
The physical dimensions of IT-DS Modules are given in Appendix A.
In addition to the size of the module itself, the arrangement of the piping and electrical
connections determines the amount of space the module needs to operate. This
arrangement varies from site to site, depending on the conditions at a particular location.
2.4.3 Electrical Requirements
IT-DS modules require the following power sources (see Table 2-1). In all cases the cathode
must be at earth ground potential as shown in Figure 2-2.
Figure 2-2 Module Grounding Requirements
Table 2-1 IT-DS Series Power Requirements
Module
Type
Design
DC volts
Design
DC Amps
IT- DS05-S 0~55 0~6
IT- DS10-S 0~135 0~6
IT- DS20-S 0~240 0~6
IT- DS30-S 0~320 0~6
IT- DS50-S 0~400 0~6
2.4.4 Feed Water Requirements - RO Permeate
Feed water for IT-DS modules must always meet the specifications outlined in Table 2-2 below.
In most cases, pre-treating IT-DS modules 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 IT-DS feed water (RO
Permeate) on site with the feed water requirements listed below.
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Table 2-2 Feed Water Specifications
Feed Water Source RO permeate
Feed Water Conductivity Equivalent,
including CO2< 40 μS/cm
Silica (SiO2) < 1 ppm
Iron (as Fe, Mn, S) < 0.01 ppm
Maximum Total Chlorine (as Cl) < 0.02 ppm
Total Hardness (as CaCO3) < 1.0 ppm
Dissolved Organics (TOC as C) < 0.5 ppm
pH 4 - 11
Temperature 41-113°F(5 - 45°C)
Inlet Pressure < 100 psi(7 bar)
NOTE - If the CO2concentration of IT-DS modules feed water is above 5.0 ppm, buildup of
CO2in the water system may make it impractical to recycle the IT-DS module reject to the
RO feed.
2.4.5 Drain Requirements
Place the IT-DS module(s) near a drain that can accommodate at least 100% of the total feed flow.
2.5 Flow Rates and Pressure Drops
See Appendix A
3 IT-DS Module Installation & 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 IT-DS Module into Place
Confirm that the pre-installation requirements outlined in Section 2 are met and the system is ready
for IT-DS Module installation.
Remove shrink wrap (if applicable) and move the module to its operating location.
Threaded holes (3/4 -10 UNC) are provided on each endplate to allow installation of eye
bolts or handles for assistance.
Remove the plugs or caps that seal each of the inlet and outlet ports.
Use safe lifting practices when moving the module.
Failure to remove plugs can cause permanent damage to the modules.
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3.2
Checking Module Torque - First time operation
If the nuts on the threaded tie bars have loosened during shipment, the
pressure from the incoming water can cause permanent damage.
Therefore the bolt torque must be checked and the module tightened as
required before flowing water into the module.
Always drain water from the IT-DS module before tightening the endplate tie
bar nuts. This relieves pressure in the module. Failure to do so can
result in irreversible damage.
Do not open the IT-DS Module. Opening the module will void the warranty
and do irreversible damage.
Before starting the IT-DS Module for the first time, check the tightness of the Module end plate tie-
bar nuts. Referring to Figure 3-1 and Table 3-1, tighten as required. Not all modules will need
tightening.
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Tightening End Plate Tie-bar Nuts
Sequence: Figure 3-1 shows the sequence in which to tighten the tie bars. In other
words, start the tightening process with # 1, and finish with # 14.
Torque Specification: Table 3-1 gives the torque specification for each tie-bar, as
numbered in Figure 3-1.
Tighten the end plate tie-bar
nuts on the IT-DS Module following
these steps:
1. Using a 19 mm open
ended wrench, hold the acorn
nuts on the plumbing (cathode) end of
the module.
2. Insert the 19 mm extra
deep socket (IONTECH part number
IP-IT-DSSOCKET) in a torque
wrench and turn all 14
tie-bar hex nuts (anode end) to
10 ft-lbs following the sequence.
3. Set the torque wrench
to 12.5 ft-lbs and tighten
positions 1-8 and 11-14 to this
specification.
4. Reset the torque
wrench to 25 ft-lbs and tighten
positions 1-8 to this
specification.
Figure 3-1 Module Tightening Sequence
5. Confirm that 11-14 are still at 12.5 ft-lbs and 9,10 are still at 10 ft-lbs. If not, retighten.
Use caution to avoid over tightening. Do not exceed torque specified in Table 3-1.
Table 3-1 Tie bar torque specifications
Tie-bars Torque
1-8 25 ft. lbs
11-14 12.5 ft. lbs.
9,10 10 ft. lbs.
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3.3 Connect Plumbing Fittings
Make sure all upstream pretreatment equipment and piping have been thoroughly flushed with
particle-free water before connecting them to the IT-DS Module.
Pre-Flushing - Make sure all upstream pretreatment equipment and
piping have been thoroughly flushed with particle-free water before
connecting them to the IT-DS Module. Flushing removes any particles left
in the piping from cutting and assembly. If particles remain, they could plug
the small internal passages inside the IT-DS Module.
NOTE - Failure to properly flush pretreatment water system of
installation debris to drain prior to flowing water to the EDI can result in
particulate fouling that may be irreversible.
The drawing in Appendix C shows the location and pipe sizes for plumbing connections to the
module. The module pipe connections are male BSP thread and are designed to seal against the flat
gasket. Do not use Teflon tape or other sealant on these ports.
Sealing Mechanism - The seal is created by a compressing the flat gasket elastomer that has
been over-molded onto the male BSM threaded connection ports. The threads are NOT
TAPERED pipe threads and DO NOT CREATE the seal. The BSP parallel threads allow the
sealing surfaces to move towards each other to effectively compress the elastomer.
Use of Sealants - DO NOT use Teflon® tape or any other pipe sealant (e.g. Dope) on the BSP
thread adapters. The use of these products on the BSP thread adapter will prevent good sealing.
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3.4 Electrical
3.4.1 Electrical Precautions
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 acceptable
Lockout/Tagout 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 the
manual and the local codes.
Loose wire connections can cause electrical arcing and must be avoided.
Ensure that all terminal connections are properly tightened.
3.4.2 Electrical Connections
Run conduit and wires from the DC power supply to the terminal strip inside the anode or cathode
junction box. (see drawing in Appendix B). There should be one lead for the anode (+), one lead
for the cathode (-), and one for the ground (see Figure 2-2). Insure the DC wiring is correctly
connected to the DC power supply and meets local electrical code.
Power co2nnections to the module junction box should be made with 12AWG
(3.31mm ) wire.
Power connections from the modules should be connected to a suitable power supply capable of
meeting the DC power requirements of the module.
3.4.3 Determine Operating DC Current Prior to Startup
Test the IT-DS feed water quality by running the RO system / EDI feed water to drain and testing
with the following individual test kits:
Table 3-2 Feed water test kits
Analyte Hach Model Smallest increment
CO2CA-23(#143601)1.25 mg/L
Cl2CN-70(#1454200)0.02 mg/L
Hardness HA-71A(#145201)1 mg/L
Silica SI-7(#2255000)0.02 mg/L
Set the electrical current at the specific setting required to meet product water quality
specifications as estimated below.
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NOTE: A carbon dioxide test kit is necessary to measure the CO2 concentration in
the feed water.
The DC current set point is determined based on the following site conditions:
•Feed water conductivity
•Feed water carbon dioxide concentration
•Flow rate per module
The following equation will calculate the current to be applied to one IT-DS module. For multiple
systems, each one should be controlled individually and set to this current.
To determine the current setting (amps), follow these steps:
a) Calculate Feed Conductivity Equivalent (FCE)
FCE = Measured Conductivity, (µS/cm) + (CO2ppm x 2.79)
b) Calculate Current (I)
Icurrent = (1.31) (Q liters/min) (FCE)
(dilute_cells) (c.e)
Where: Q = Product flow (liters/min)
FCE = Feed Conductivity Equivalent
I = Current (amps)
c.e.= %Current Efficiency,10 to 20 is typical
dilute_cells = number of product(dilute) compartment
cells (IT-DS4 has 4 product compartment
cells and IT-DS10 has 10 product
compartment cells
IT-DS45has45
product compartment cells)
Example - for one IT-DS30:
Product Flow = 15 gpm = 56.8 liters/min
Dilute_cells = 30 cells
Feed conductivity = 2.0 µS/cm
Feed carbon dioxide = 3.75 ppm CO2 1. FCE
= 2.0 + (2.79) (3.75) = 12.46
2. I = [(1.31) (56.8 GPM) (12.46 µS/cm)] / [(30cells)(20)] = 1.5 Amps
Example Above - SET THE CURRENT AT 1.5 AMPS
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NOTE: The above calculations assume 20% current efficiency, which is suitable for
many applications. However, certain applications, such as those requiring high silica
removals, may require operating at 10% current efficiency, or two times the amperage
calculated above. The modules should be set to operate with a constant
current allowing the voltage to fluctuate with changes in temperature, flow, etc.
3.5 START-UP Procedure
Test IT-DS module feed water to ensure that feed water parameters are within the required ranges.
The most common tests are listed in Table 3-2.
Test flow switches and other interlocks, including the RO interlock if applicable
Test pressure relief if applicable
Set alarm points
3.5.1 Start-up IT-DS module
Make sure that modules are correctly connected to the DC power source.
Make sure that the IT-DS product piping line is directed to drain.
Turn on the feedwater. Adjust valves to obtain the desired flows and pressures in the
product and reject streams. Standard IT-DS reject flow is typically set at about 11% of the
product flow (this gives a water recovery of 90%). See Section 3.6 on recovery, hardness
and silica for additional information regarding recovery. Valves are adjusted so the
product outlet pressure is about 2 to 5 psig higher than the reject(concentrate)
outlet pressure at the desired flow rates. This pressure balance is critical to
ensure optimal EDI performance.
Adjust the DC power supply to the current setting calculated in Section 3.4.3. Or use the
DC Startup Current Calculator available on Iontechbj.com.
Test all flow switches and interlocks to ensure IT-DS 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(dilute) outlet pressure 2-5 psi above the reject(concentrate)
outlet pressure.
When the system is at steady state (quality in specification and stable operation), record
operating data on the data sheet provided in Section 4.1.1.
3.6 Recovery, Silica and Hardness
IT-DS recovery of 95% is limited to systems with feed water total hardness of less than or equal to
0.2 ppm as CaCO3. Reduction of hardness is normally accomplished with ion-exchange
softening or with two-pass RO. In addition there are minimum reject(concentrate) flow with
requirements listed below in Table 3-3. Therefore, 95% recovery is not always attainable for less
than nominal product flow rates.
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For recovery of 90-95%, feed water silica must be
1 ppmasSiO2
Table 3-3 Minimum Concentrate Flow Rates
Module Type No. cells Minimum Concentrate Flow Rate
IT-DS05-S 4 0.07 gpm [16.2 lph]
IT-DS10-S 10 0.16 gpm [35.6 lph]
IT-DS20-S 18 0.27 gpm [61.4 lph]
IT-DS30-S 30 0.44 gpm [100.3 lph]
IT-DS50-S 45 0.66 gpm [148.8 lph]
NOTE: The concentrate flow rates per module should never drop below
the recommendations in Table 3-3. Failure to maintain necessary
concentrate (reject) flow rates can create improper flow distribution
(channeling), decrease product quality and potentially permanently
damage the EDI module through overheating.
Equation 3-1 Recovery Equation
4 Maintenance and Troubleshooting
The following section details the maintenance procedures for the IT-DS module. It contains general
maintenance information and specific maintenance information for cleaning and sanitizing the
modules.
NOTE: The cleaning chemical volumes & flows detailed in this section are per a single
module.
This section also lists possible problems and troubleshooting procedures for the IT-DS module. All
operators and personnel involved with the module should read and become familiar with all
maintenance and troubleshooting procedures.
4.1 General Maintenance Guidelines
4.1.1 Operating Data Log Sheets
IT-DS 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 this section 4.1.1. 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
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manual should contain log sheets more appropriate for your particular system. However, the items
in bold must be filled out to maintain module warranty.
4.1.2 Periodic Maintenance
Perform the following tests at least once every six months. Check the Troubleshooting portion of this
Section 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.
Closely inspect the module for any buildup of salt on the spacers, endblocks, or
endplates. If salt buildup is apparent, turn off power and rinse salt from the module.
Periodically tighten all electrical connections.
Check torque on module bolts per section 3.2
4.2 Specific Maintenance Guidelines
Periodically, the IT-DS module may need cleaning or sanitization. Cleaning the module removes
scale and other resin/membrane foulants.
Before starting any cleaning or sanitization procedure, see section ?? for
recommended cleaning solutions and use. Ensure that all necessary
chemical material safety standards are followed.
Do not run cleaning or sanitization solution through the IT-DS modules when
DC power is applied to the modules. Make sure that DC power is OFF
before cleaning.
4.2.1 Cleaning Circumstances
The module may need CLEANING if:
•Product(dilute) differential pressure increases by 50% without a change in temperature
and flow, or
•Reject(concentrate) 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's 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. These operational
circumstances can be noted through periodic reviews of module trends using the daily operational log
sheets.
4.2.2 Sanitization Circumstances
The system may require periodic SANITIZATION if the product water calls for low levels of
bacteria (a user specific requirement). Through the use of electrical current to drive ions into
dilute and concentrating compartments, the EDI module establishes a bacteriostatic
20 IT-DS MAN Rev 0
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4
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