AmeriWater MediQA MSP Manual

AmeriWater
The Water Purification Specialists
Operation & Maintenance Manual
3345 Stop 8 Rd, Dayton, OH 45414 | 800 535 5585 | www.ameriwater.com 98-0157 Rev P
Manufactured With Pride in The USA
MediQA
Reverse Osmosis System
MODELS MSP AND MDP

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TABLE OF CONTENTS
CONTACT DETAILS.....................................................................................................................................4
INTRODUCTION AND SAFETY INFORMATION .......................................................................................5
2.1 Indications for Use.............................................................................................................................5
2.2 Controls...............................................................................................................................................5
2.3 Alarms and Maintenance..................................................................................................................5
2.4 Caution and Warning Statements ...................................................................................................6
2.5 General Safety Information..............................................................................................................7
STANDARD FEATURES.............................................................................................................................10
3.1 MediQA Standard Features ............................................................................................................10
3.2 Electrical Specifications / Connections .........................................................................................10
3.2.1 Mains Supply............................................................................................................................10
3.2.2 USB Connection Details..........................................................................................................10
3.3 Environmental..................................................................................................................................11
3.4 Standards Applied ...........................................................................................................................11
3.5 Specification Data ............................................................................................................................12
3.6 Performance Parameters ...............................................................................................................13
OPERATIONAL OVERVIEW ......................................................................................................................14
4.1 MediQA Basic Operation ................................................................................................................14
4.2 Sequence of Operations .................................................................................................................16
4.2.1 Introduction .............................................................................................................................16
4.2.2 Hi Recovery Mode ...................................................................................................................17
4.2.3 Standard Recovery Mode .......................................................................................................18
4.2.4 Cleaning Procedure.................................................................................................................19
4.2.5 Disinfection Procedure ...........................................................................................................20
4.2.6 Heatsan Control.......................................................................................................................21
4.3 Pump Operation ..............................................................................................................................22
INSTALLATION .........................................................................................................................................23
5.1 Environment.....................................................................................................................................23
5.2 Unpacking.........................................................................................................................................23
5.3 Connections......................................................................................................................................23

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5.3.1 Electrical Supply.......................................................................................................................23
5.3.2 Water connections ..................................................................................................................23
5.3.3 Drainage ...................................................................................................................................23
5.4 Commissioning ................................................................................................................................24
5.4.1 Pretreatment Lockout.............................................................................................................24
5.4.2 Heatsan Water Loss Lockout .................................................................................................25
5.4.3 Alarm Panel Connections .......................................................................................................25
5.4.4 Installation Kit Details .............................................................................................................25
5.5 Initial Startup....................................................................................................................................26
OPERATOR INTERFACE ...........................................................................................................................32
6.1 Operation Menu ..............................................................................................................................32
6.1.1 Operation Menu Screen .........................................................................................................32
6.1.2 Operation Periods ...................................................................................................................35
6.2 Main Menu Screen...........................................................................................................................36
6.2.1 Viewer Screen ..........................................................................................................................36
6.2.2 Activity Details Screen.............................................................................................................37
6.2.3 Activity Log Screen ..................................................................................................................37
6.2.4 Status Monitor Screen ............................................................................................................38
6.2.5 Alarms Screen..........................................................................................................................38
6.2.6 Alarm Log Screen ....................................................................................................................39
6.2.7 Diagnostics Screen..................................................................................................................39
6.3 Operation Menu Screen .................................................................................................................40
6.4 Settings Menu Screen .....................................................................................................................40
6.4.1 RO Supply Screen ....................................................................................................................41
6.4.2 RO Clean Screen ......................................................................................................................43
6.4.3 RO Heat Disinfect Screen .......................................................................................................43
6.4.4 Activity Log Screen ..................................................................................................................44
6.4.5 Alarms Screen..........................................................................................................................45
6.4.6 Clock Screen.............................................................................................................................45
6.5 Calibration Menu Screen ................................................................................................................46
6.5.1 Flowmeters Screen..................................................................................................................46

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6.5.2 RO Parameters Screen ...........................................................................................................47
6.5.3 Alarm Settings Screen.............................................................................................................47
6.5.4 Line Cells Screen......................................................................................................................48
6.5.5 RO Heat Disinfect Screen .......................................................................................................48
6.5.6 Chemical Clean Screen ...........................................................................................................49
6.5.7 Overrides Screen.....................................................................................................................49
6.5.8 Diagnostics Screen..................................................................................................................50
6.5.9 System Screen .........................................................................................................................50
FAULTS AND FAULT FINDING ................................................................................................................51
SANITIZING & CLEANING........................................................................................................................54
8.1 Exterior Surface Cleaning ...............................................................................................................54
8.2 Chemical Cleaning ...........................................................................................................................54
8.3 Approved Chemicals .......................................................................................................................56
8.4 RO Heat Disinfect Procedure .........................................................................................................56
8.4.1 Manual RO Heat Disinfection ................................................................................................56
8.4.2 Automatic RO Heat Disinfection............................................................................................57
MAINTENANCE.........................................................................................................................................58
9.1 Thermostat Testing .........................................................................................................................58
9.2 Spare Parts .......................................................................................................................................58
9.2.1 MSP Spare Parts ......................................................................................................................59
9.2.2 MDP Spare Parts......................................................................................................................61
9.3 Replacement Part History Log Sheet ............................................................................................63
FLOW DIAGRAMS .................................................................................................................................64
WIRING SCHEMATIC ............................................................................................................................66
COMPONENT IDENTIFICATION ..........................................................................................................82
12.1 Control Panel................................................................................................................................83
APPENDIX..............................................................................................................................................87
13.1 Default Settings List ....................................................................................................................87
13.2 Connecting to Pump ...................................................................................................................89
13.3 Diagnostic Guide..........................................................................................................................91

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CONTACT DETAILS
We trust the unit meets all your expectations but in the event of any problems please do not
hesitate to contact us as follows:
For all spares and consumables contact:
Customer Service Tel No: 1-800-535-5585
For all service or technical support contact:
Technical Support Tel No: 1-800-535-5585
Web address: www.ameriwater.com
(Or your local authorized AmeriWater dealer)
Useful Telephone Nos.
Tel No………………………………Contact Name:……………………………….
Tel No………………………………Contact Name:……………………………….

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INTRODUCTION AND SAFETY INFORMATION
2.1 Indications for Use
The AmeriWater MediQA Reverse Osmosis System is one component of a water treatment system
designed to pre-treat and purify potable water using reverse osmosis for making dialysate for
hemodialysis applications. The device is intended to be a component in a complete water
purification system, and is not a complete water treatment system. It must be preceded by pre-
treatment devices, and may need to be followed by post-treatment devices as well to meet current
AAMI and Federal (U.S.) standards. The AmeriWater MediQA is intended for use in water rooms in a
hospital, clinic, or dialysis center. The device includes an integrated heat sanitization process.
The MediQA is available in both single pass (MSP) and double pass (MDP) models that supply from
5.5 to 12 gallons per minute (gpm) of product water. Model MSP2 is a single pass, dual-membrane
RO that produces up to 9 gpm of product water. Model MSP3 is a single pass, 3-membrane RO that
produces up to 12 gpm of product water. Model MDP2 is a double pass, 3-membrane RO that
produces up to 5.5 gpm of product water. Model MDP4 is a double pass, 5-membrane RO that
produces up to 10 gpm of product water.
The MediQA is a Medical Device; as such modifications to the device are not permitted.
Modifications to the machine by anyone other than AmeriWater personnel will invalidate the
marketing clearance for the device.
WARNING: This Reverse Osmosis System (RO) contains a preservative solution to prevent
microbiological growth and freezing. Discard all product water for at least two hours of
operation before placing the RO in service.
CAUTION: When used as a medical device, Federal law restricts this device to sale by or on the
order of a physician per 21 CFR 801.109(b)(1)!
2.2 Controls
The processes of the MediQA units are controlled automatically. The MediQA is operated via a
touch screen display panel which also displays system performance data. Process water is
constantly monitored for:
Water quality (μS/cm)
Temperature (°F)
Flowrate (gpm) Pressure (psi)
These parameters can be viewed via the touch screen display. A data logger is provided and the data
logger information can be downloaded via a memory stick to a PC.
2.3 Alarms and Maintenance
The MediQA incorporates monitoring devices and will report alarms and warnings via the touch
screen display. These indicate malfunctions or that preventative action is required. This ensures the
unit is maintained and operated correctly. Reference to these alarms and appropriate actions can be
found in Section 7.

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2.4 Caution and Warning Statements
These instructions provide information on safe working practices. These should be adopted to
ensure safe and continuing operation of the equipment. The manual should be read and
understood before the equipment is placed into service.
AmeriWater reserves the right to make engineering refinements to the equipment that may not be
described herein. Any questions that cannot be answered specifically by these instructions should
be addressed to AmeriWater or their agents for a response.
AmeriWater will not accept any responsibility for any equipment supplied or the actions of such
equipment or associated system when the customer has made a modification that is considered by
AmeriWater to compromise the integrity of the original design philosophy.
If the unit’s performance becomes impaired and any remedial work appears to be outside the scope
of this manual, then seek advice from AmeriWater Technical Support at telephone number 1-800-
535-5585. Be prepared to provide the unit’s serial number.
The unit must not be dismantled unless carried out by AmeriWater personnel or authorized trained
personnel.
Under no circumstances should the unit be connected to the electrical supply with the front control
panel open.
Always refer to the Material Safety Data Sheets before handling any of the recommended cleaning
chemicals.
There is the potential for sensitive equipment/devices located in close proximity to the MediQA unit
to be affected by electromagnetic or other interference generated from other units. If affected by
interference the relevant equipment/device should be relocated.
The use of mobile phones in close proximity to the MediQA unit should be avoided where possible.
The MediQA unit should only be pushed via the frame when the casters are down. Pushing on the
plumbing, the control panel, or the pump could result in damage to the unit.
The ‘Caution’ symbol is used throughout this manual to highlight where particular care must be
taken to ensure the safety of the operator, and the protection provided by the equipment, is not
impaired.

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2.5 General Safety Information
Explanation of symbols and references
DANGER: This symbol refers to any immediate dangers that may threaten the safety and life
of persons. Failure to observe these notices will have severe consequences on health and
safety, including life-threatening injuries.
WARNING: This symbol refers to a possible danger that threatens the safety and life of
persons.
CAUTION: This symbol refers to a possibly hazardous situation. Failure to observe these
references may result in minor injuries and/or damage to property.
NOTE: This symbol points out important information for working with the system in a proper
manner.
This symbol indicates possible hot surface. Touching parts of the machine
showing this label should be avoided. Failure to observe these references may
result in malfunctions in the system or impact on the environment.
Additional safety requirements
Country-specific requirements standards and regulations must be observed.
Usage in accordance with intended purpose.
The MediQA units are used to purify water for the purpose of feeding medical devices (dialysis
machines). The water produced must not be used for drinking as it may be harmful to the body or
for any other purpose not described in this manual. The units must only be operated in accordance
with this operating manual. The units must not be operated unless in proper working order. Any
malfunctions must be rectified immediately.
•Indoor use only.
•Not to be used in an explosive atmosphere.
•Refer to environmental conditions Section 3.3.
Operating staff
Only persons who have read and understand these Operation Instructions should be permitted to
operate the unit. When operating the unit, it is particularly important to observe the safety
information strictly.
Mechanical force
Some parts of the system could be under pressure of up to 300 psi. Always make sure the pressure
has dispersed from the unit before repairs and maintenance tasks are carried out.

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Bringing the system to a stop in the event of an emergency
• Depress the Emergency stop button
• Turn off the electrical supply and isolate.
• Shut off the water supply.
After remedying the fault:
• Open the water supply.
• Turn on the electrical supply.
• Reset to emergency stop button
• Clear on main screen of touch panel
• Restart/operate the unit via the main touch screen panel.
Safety information for maintenance tasks
The operator must take care to ensure that authorized and qualified professionals who have been
sufficiently trained for the task at hand by thoroughly studying the Operating Instructions perform
all maintenance, inspection and assembly tasks. Professionally trained staff must properly perform
these tasks.
The system must be shut down and protected from being placed in operation again unintentionally
before all repair and maintenance tasks have been completed. It is essential to observe the
procedure described in these Operating Instructions for shutting down the system.
Before beginning tasks on the electrical equipment of the system, a check must confirm that power
has been disconnected from the corresponding section of the system. In addition, the system must
be secured to prevent it from being turned on again unintentionally. Follow proper Lock Out Tag Out
(LOTO) procedures.
Disposing of system parts and operating materials
When they need to be discarded, consumables must be disposed of according to local
requirements.
Unauthorized conversion and manufacturing replacement parts
Conversion or modification of the system is only permitted with the approval of the manufacturer.
The same applies to making changes in the programming for the control system. Original
replacement parts and accessories authorized by the manufacturer enhance safety. Use of other
parts will void the warranty.

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Warranty claims and liability
The buyer has a one-year warranty on all equipment and parts, excluding non-durable components
(e.g., filter cartridges, reverse osmosis membranes, filter media, consumable chemicals, etc.);
provided that the system is not subject to abuse, misuse, alteration, neglect, freezing, accident or
negligence; and provided further that the system is not damaged as the result of any unusual force
of nature such as, but not limited to, flood, hurricane, tornado, or earthquake.
The warranty covers the replacement of equipment and/or parts only. The warranty does not cover
labor charges or travel expenses resulting from the service of equipment. The manufacturer is
excused if failure to perform its warranty obligations is the result of strikes, government regulation,
materials shortages, or other circumstances beyond its control.
To obtain warranty service, notice must be given to the manufacturer within 30 days of the discovery
of the defect.
There are no warranties on the AmeriWater system beyond those specifically described above. All
implied warranties, including any implied warranty of merchantability or of fitness for a particular
purpose are disclaimed to the extent they might extend beyond the above periods. The sole
obligation of the manufacturer under these warranties is to replace or repair the component or part
which proves to be defective within the specified time period, and the manufacturer is not liable for
consequential or incidental damages. No dealer, agent, representative, or other person is authorized
to extend or expand the warranties expressly described above.
Some states do not allow limitations on how long an implied warranty lasts or exclusions or
limitations of incidental or consequential damage, so the limitations and exclusions in the warranty
may not apply to you. This warranty gives you specific legal rights, and you may also have other
rights, which vary from state to state.
Manufacturer:
AmeriWater Telephone: [phone]
3345 Stop 8 Road Fax: [phone]
Dayton, OH 45414
United States of America

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STANDARD FEATURES
3.1 MediQA Standard Features
• Flow rate, temperature, pressure and water quality monitoring.
• System status alarms.
• Semi - automated chemical cleaning
• Touch screen user interface.
• Heat sanitization feature
3.2 Electrical Specifications / Connections
3.2.1 Mains Supply
See specification.
DANGER: The earth leakage current of this equipment can exceed 3.5mA (<5mA). Therefore, it is
essential that the earth connection is made before the supply is established.
A warning label on the equipment states:
DANGER!
DISCONNECT THE MAINS
SUPPLY BEFORE SERVICE
3.2.2 USB Connection Details
Standard USB port suitable for FAT16 formatted USB drive, 2GB max.

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3.3 Environmental
Applicable to all product variants
Parameter Value
Operating temperature range. 41-90°F (5 to 32°C)
Relative humidity. 30 to 80%
Maximum altitude. 6562 ft
Transport and storage temperature
(limited by RO membranes). 41-104°F (5 to 40°C)
RFI/EMI radiation
The EMC environment must be within the
limits to which the RO has been tested.
Care must be taken not to have sources of
RFI/EMI, which are liable to cause
electromagnetic disturbance of the unit. If
the RO is affected by such disturbance, the
source must be suppressed or moved.
3.4 Standards Applied
Applicable to all product variants
Type
Standard
EMC
BS EN 61326:1998/IEC 61326-1 :1997; Class A
Electrical equipment, for measurement, control and laboratory use EMC
requirements.
BSEN 61000-3-2:1995, Incorporating Amendments 1 & 2.
Mains Harmonic Emissions.
BS EN 61000-3-2:1995, Incorporating Amendment 1
Mains Flicker Emissions.
LVD
BS EN 61010-1:2001, Incorporating Amendment 1
Safety requirements for electrical equipment, for measurement control and
laboratory use.
MDD
BS EN ISO 13485:2003
Medical Devices Quality Management System

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3.5 Specification Data
Single Pass MediQA Dual Pass MediQA
Catalog Number
00MSP2
-230
00MSP3
-230
00MDP2
-230
00MDP4
-230
Performance
Permeate flow rate
@ 77°F**
gpm 9.0 12.0 5.5 10.0
Dimensions
Height
Inches
73 5/8
73 5/8
Width
Inches
37
37
Depth
Inches
62 9/16
74 5/16
Weights
Working
lbs
1310
1375
1660
2285
Shipping*
lbs
1050
1100
1370
1970
Services-Feed Water
Pressure
30/80 psi
Free Chlorine
Following activated carbon, total chlorine level must be < 0.1 ppm
Temperature
For best performance feed water temperature should be 55°F to 95°F
TDS
Maximum feed water total dissolved solids 1000 ppm
Total Hardness
Softened feed water with a total hardness of < 4 ppm as CaCO3
S.D.I.
Silt density index following final 5 micron filtration should be < 5
Fluoride
< 1.2 ppm for “Hi Recovery Mode”
Services - Power
Supply
V/ph/Hz
All units require 3-phase supply 208/230V,with Neutral, 60 Hz
Max Current Draw
Amps
44
44
44
59
* Un-crated weight.
** Variations in feed water temperature can affect output by up to +3% per degree Fahrenheit.

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3.6 Performance Parameters
MediQA Performance Parameters
Single Pass
Dual Pass
Catalog Number
MSP2
MSP3
MDP2
MDP4
Flow Rates
Product Flow Specification (GPM)
9
12
6
10
Product Flow Range (GPM)
7.2-10.8
9.6-14.4
4.8-7.2
8-12
Stage 1 Concentrate Flow (GPM)
Nominal: 5
3.8-9
Nominal: 6.5
5-12
Nominal: 5
3.8-9
Nominal: 6.5
5-12
Stage 2 Concentrate Flow (GPM)
NA
NA
1-3
1-3
Stage 1 Recovery (%) Nominal: 65
50-70
Nominal: 65
50-70
Nominal: 65
50-70
Nominal: 65
50-70
Stage 2 Recovery (%) NA NA
Nominal: 80
75-85
Nominal: 80
75-85
Pressure
Stage 1 Pump Pressure (PSI)
140-180
140-180
140-180
140-180
Stage 2 Pump Pressure (PSI)
NA
NA
140-180
140-180
Feed Water Pressure (PSI)
30-80
30-80
30-80
30-80
Interstage Pressure [Bar]
(PSI)
NA NA
2-5
(30-70)
2-5
(30-70)
Temperature
Feed Water Temperatures (F)* 55-95 55-95 55-95 55-95
Conductivity
Output Conductivity**
>94% Incoming
>94% Incoming
>94% Incoming
>94% Incoming
Water
Water
Water
Water
•Based on Standard Recovery Mode
•Each MediQA should perform within these parameters. Pressures may vary depending on the age and condition of the membrane.
•The DOW heat disinfection membranes are manufactured with a ±20% tolerance for flow rate. This is factored into the Product Flow Range
category.
•*The ideal Feed water temperature is 77 degrees Fahrenheit. This will be the optimal operation temperature of the system.
•**Output conductivity is based on the quality of the feed water; the membranes should reject greater than 94% of the incoming conductivity.

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OPERATIONAL OVERVIEW
The MediQA is available as a single pass or dual pass reverse osmosis (RO) unit to be used for
purification of potable water for renal dialysis applications.
Potable water enters the MediQA through an inlet solenoid valve filling the feed water tank. A high
pressure pump delivers water from the feed water tank through the 1st stage RO module set (may
comprise of one or more modules), with each module containing a high performance membrane.
The water entering the RO module is split into two flows. The water which passes through the RO
module (membrane) is known as permeate and is purified water. The rest of the water, rejected by
the membrane, passes out of the RO module as a second flow stream. The rejected water contains
an increased level of dissolved salts and is known as concentrate. A portion of the concentrate will
be recovered and directed back into the tank for re-processing.
In the single pass system, Hi Recovery Mode allows a higher percentage of reject water to be
recovered. The default target recovery percentage is 65%.
In the dual pass system, process water (permeate) from the 1st stage is pressurized by a second
high pressure pump and fed to the second stage RO module set (may comprise of one or more RO
modules).
In the dual pass (two RO stages) MediQA, a portion of the concentrate (reject water) from the 1st
stage RO module set is discharged to drain while the balance is returned to the tank. Concentrate
from the 2nd stage RO module set is returned to the feed water tank for reprocessing.
Permeate from the 2nd stage RO module set is fed via a manifold to the distribution loop. Permeate
returning from the loop is fed back into the feed tank.
The feed and permeate water flows are monitored at various points in the process to verify
temperature, conductivity, and flow.
This data is displayed on a touch screen panel to give instant feedback of water quality and process
activity.
4.1 MediQA Basic Operation
When TIMER or CONTINUOUS is activated by touch buttons on the touch screen display the MediQA
initially performs an AutoFlush followed by an AutoRinse routine, once completed purified water will
be available (supplied through connection pipe work) to the distribution loop or attached medical
device. This feature of the system prevents inadvertent supply of poor water quality to the loop or
attached device (typically dialysis machines). System operation can be switched OFF by pressing the
OFF button on the touch screen display.
Purification of the incoming softened water supply is achieved by employing reverse osmosis
membranes technology.

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The MediQA can be set to “POWER ON STANDBY” for occasions when there are long periods
(typically days during shut down periods) without use. In standby mode the MediQA is factory set to
perform 10 minutes of operation in every 2 hours, these values are adjustable. This enables water to
be circulated through the MediQA and distribution loop, in order to maintain water quality.
The MediQA has two modes of operation, TIMER and CONTINUOUS. If TIMER is selected an internal
time clock activates operation and heat disinfects, determined by the timer clock settings. When not
scheduled to operate, the device will turn on every 2 hours for 10 minutes of operation to maintain
the quality of the water in the distribution loop. If CONTINUOUS is selected the MediQA will supply
water to the attached distribution loop / medical devices on a 24/7 basis.
MediQA units have the capability to run in HI RECOVERY MODE, which uses up to 40% less water
than STANDARD RECOVERY MODE. HI RECOVERY MODE is the default setting. See Section 6.4.1 for
navigation instructions.
The MediQA also features routines to enable chemical cleaning of its RO membranes (but not the
connected distribution loop).
In addition to the above, the MediQA incorporates process elements to enable heat disinfection of
the reverse osmosis membranes and its pipe work. Heat disinfection can be activated manually
using the RO Heat Disinfection button on the touch screen display or automatically if timer clock
settings are implemented.
Regular cleaning and sanitization of the unit is recommended to maximize the life of the RO
membranes and ensure high performance.
Once CHEMICAL CLEAN has been selected the process is semi-automatic and requires only the
provision of specified cleaning. The touch screen display will give prompts at appropriate stages of
the routine.
Frequency of heat disinfection will depend upon usage and application demands. Monitoring of the
system for bacterial content should be conducted at regular intervals to determine the optimum
frequency for heat disinfection. Recommended weekly disinfections and monthly monitoring of
bacteria and endotoxins.

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4.2 Sequence of Operations
4.2.1 Introduction
There are two modes of operation, Hi Recovery Mode and Standard Recovery Mode. Hi Recovery
Mode is the default and can be toggled to Standard Recovery Mode on the RO Supply screen (see
Section 6.4.1). The MediQA system uses a series of automated 2 and 3-way stainless steel valves to
direct the water flow through the unit during each of the various stages of operation. These valves
are marked with yellow indicators that represent the openings of the valve. The yellow markers are
used as a visual indicator of the position of the ball valve as it relates to the flow of the water
through the valve. The following pictures illustrate the valves during operation.
Product to Loop Valve
Loop Return Valve
Concentrate to Drain Valve
Water enters valve
Water exits valve
Concentrate Throttle Valve
Recirculation Throttle Valve

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4.2.2 Hi Recovery Mode
This mode of operation is designed to limit water usage while still meeting water quality standards.
Hi Recovery Mode uses up to 40% less water than Standard Recovery Mode. The mode is comprised
of Flush, Rinse, and Supply.
FLUSH
Before the MediQA provides water to the loop for dialysis use, the system goes through a flush. This
isolates the water from the loop and dumps all of the water down the drain for a preset time. The
following figures show the valve positioning during this process. Positioning of the valves is
controlled via the PLC.
Figure 1
Figure 2
Figure 3
Concentrate to Drain Valve
Loop Return Valve
Product to Loop Valve
RINSE
After the flush cycle is completed, the RO will go into a rinse. During Rinse the unit continues to run
the pump(s) at a high pressure. Water is flushed down the drain similar to the flush of the
membranes. The position of the valves during this process is the same as Figure 1 through Figure 3.
The Rinse Mode continues until the unit meets a predetermined quality level or until the Rinse cycle
runs for the max time. If it reaches the max time and has not rinsed down to quality level, an alarm
will be triggered. If it reaches quality, it moves to the Supply Mode.
SUPPLY
After Flush and Rinse cycles are completed, the MediQA will go into Supply. Supply is when the RO
begins providing water to the loop for use with the Dialysis machines. This is the process the RO will
be in for a majority of its usage. During the supply mode, valve position is critical as product flow
rate is directly dependent on the valves. Water returning from the loop is redirected to the MediQA
tank via the loop return valve shown in Figure 5. The following figures show the expected position of
these valves during normal operation and are instructed to be fully open via the PLC. This mode is
split into two parts to conserve water, reject to tank and reject to drain. During this period of
operation, the reject water will be sent to drain at a target of 65% recovery.

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Reject to Tank:
Concentrate and permeate water will recirculate to the feed water break tank until the permeate
quality reaches the HI RECOVERY QUALITY HIGH LIMIT or BREAK TANK TEMPERATURE HIGH LIMIT
set-points. When these set-points are reached the reject to drain period will begin and the RO will
dump the reject water to drain. During times of low water usage in the RO distribution loop, the feed
water quality in the break tank will remain close to incoming water quality. See Section 6.4.1 for
more information.
Figure 4
Figure 5 Figure 6
Concentrate to Drain Valve
Loop Return Valve
Product to Loop Valve
Reject to Drain:
Reject water is dumped to the drain until the permeate
quality reaches the HI RECOVERY QUALITY LOW LIMIT or
BREAK TANK TEMPERATURE LOW LIMIT set-point. Valve
position will remain the same for Loop Return and Product
to Loop Valves. The Concentrate to Drain Valve will rotate
as shown in Figure 7.
Figure 7
Concentrate to Drain Valve
4.2.3 Standard Recovery Mode
Standard Recovery Mode is also comprised of Flush, Rinse, and Supply mode. Flush and Rinse
operations remain the same, see Figure 1 through Figure 3. However, when operating in Standard
Recovery Mode, there is no Reject to Tank step of Supply. There will be more water usage due to less
water being recovered during this period. See Figure 4 through Figure 6 for valve positioning.