WRO 300 and WRO 300 H Service & Technicians guide Rev 05.2006

Safety considerations WARNING Unauthorized installation, modifications, alterations or repair of the WRO may result in malfunctioning or have other serious consequences for the safe operation of the equipment.

CAUTION 1. The WRO, may only be operated by persons trained in this equipment and who have studied the instructions in the Operator’s Manual. If the WRO does not perform as described in the Operator’s Manual, it should not be used until the condition is rectified. 2. The operator should pay attention to alarms and follow the instructions, warnings, cautions and notes given in the manual. 3. The use of mobile telephones or communication equipment in the vicinity of the WRO could adversely influence the performance of the machine. 4. WRO needs special precautions regarding EMC and needs to be installed and put into service according to the EMC information provided in the operators and service manual. 5. The WRO, will perform as designed only if it is used and maintained in accordance with Gambro’s instructions. Any warranties made by Gambro with respect to the WRO, are void if the equipment is not used in accordance with the instructions provided. Gambro will not accept responsibility for any damage or injury resulting from improper use or maintenance or unauthorized repair. 6. The user must verify the quality of the protective earth in the installation. 7. For USA: US Federal law restricts this device to sale by or on the order of a physician

NOTE During transportation and storage the equipment must be kept in its original packing. If transportation or storage time is more than 15 weeks the environmental data relating to the operation must be fulfilled.

Preface

HCEN12073 rev 05.2006

CE-marking This product is CE marked in accordance with the requirements in EC Council Directive 93/42/EEC of 14 June 1993 concerning medical devices. Notified body is: British Standards Institution (BSI) with the notified body number 0086. The symbol below means: Year of manufacturing.

The CE-marking of this manual is only valid if the device which it describes is CE-marked. Manufacturer Gambro Lundia AB, Monitor Division, Box 10101, SE-220 10 LUND, Sweden. Phone +46 46 16 90 00. All rights reserved © Gambro Lundia AB 2004, 2006

HCEN12073 rev 05.2006

Preface

Preface

HCEN12073 rev 05.2006

Content 1 Introduction 1.1 Intended use...1:1 1.2 Description of reverse osmosis...1:1 1.3 General function...1:2 1.3.1 Water purification ...1:2

1.4 Water quality ...1:3 1.4.1 Microbiology ...1:3

2 Service & Technicians guide 2.1 Overview ...2:1 2.2 Flow diagram ...2:2 2.3 Functional description ...2:3 2.3.1 RUN mode ...2:3 2.3.2 Heat disinfection (only WRO 300 H) ...2:5 2.3.3 Low flow heat (only WRO 300 H) ...2:7 2.3.4 Chemical disinfection and cleaning ...2:8 2.3.5 Preservation with freeze protection ... 2:10 2.3.6 Preservation without freeze protection ...2:11

2.4 Conductivity monitoring ... 2:11 2.4.1 Rejection rate ... 2:11 2.4.2 Preset of conductivity limits ...2:11

2.5 Main components ...2:12 2.5.1 Operator’s panel ... 2:12 2.5.2 Chemical intake unit ...2:12 2.5.3 Power supply unit ... 2:12 2.5.4 External communication unit ...2:13 2.5.5 CPU board ... 2:13 2.5.6 AC Relay board (only WRO 300 H) ... 2:13 2.5.7 Casing ...2:13 2.5.8 Flow block...2:14 2.5.9 Y coupling and product water loop ... 2:14 2.5.10 Tank ...2:15 2.5.11 RO module ...2:16 2.5.12 Heaters ...2:16 2.5.13 Motor and Flow pump unit ... 2:17

2.6 Exchanging components ...2:18 2.6.1 Exchanging RO module ... 2:18 2.6.2 Exchange Heaters ... 2:20 2.6.3 Exchanging Flow pump and motor ... 2:21 2.6.4 Exchanging Flow block ...2:23 2.6.5 Exchanging Power supply unit ... 2:24 2.6.6 Exchanging CPU board, WRO 300... 2:26 2.6.7 Exchanging CPU board or AC relay board, WRO 300 H ...2:27

2.7 Internal Service ... 2:28 2.7.1 To enter internal service ... 2:28

2.8 PC support software ...2:31 2.8.1 GXL - Logging ...2:31 2.8.2 GXP - Preset...2:31 2.8.3 GWD - Download ...2:31

HCEN12073 rev 05.2006

Content

2.9 Presets and defaults...2:35 2.9.1 Flow pump ...2:35 2.9.2 Water save ...2:35 2.9.3 Conductivity (Cond) ...2:35 2.9.4 User interface panel (LCD) ...2:36 2.9.5 Heat ...2:37 2.9.6 Disinfection protocol manager ...2:38 2.9.7 Time manager ...2:41 2.9.8 Time channels ...2:41 2.9.9 Reminders ...2:42 2.9.10 Remote ...2:42 2.9.11 Chemical intake pump ...2:42

3 Maintenance 3.1 Water testing ...3:1 3.1.1 Total chlorine (chlorine + chloramines) ...3:1 3.1.2 Hardness (if a softener is installed) ...3:1

3.2 Changing the prefilter cartridge(s) ...3:1 3.2.1 Procedure ...3:1

3.3 Preservation with glycerol ...3:2 3.3.1 Rinse ...3:3 3.3.2 Residual test after preservation ...3:3 3.3.3 In order to interrupt procedure ...3:4

3.4 Component maintenance ...3:4 3.4.1 Power supply unit ...3:4 3.4.2 RO module ...3:4

3.5 Adjusting the flow and the pressure ...3:4 4 Wiring diagram 4.1 WRO 300 H ...4:1 4.2 WRO 300 ...4:2 5 Technical data 5.1 Performance and specification ...5:1 5.2 Disinfection and cleaning ...5:4 5.3 Physical data...5:4 5.3.1 Materials in contact with product water ...5:4

5.4 Environmental data ...5:5 5.4.1 Electromagnetic environment ...5:5

5.5 Safety ...5:7 6 Troubleshooting 6.1 Alarms and notifications ...6:1 6.1.1 Operation ...6:4 6.1.2 Heat and Low flow heat (only WRO 300 H) ...6:5 6.1.3 Chem/Rinse ...6:6 6.1.4 Preservation ...6:7

6.2 Boot loader ...6:7 6.3 Testing the operator’s panel...6:7 7 Symbol description 7.1 Symbols ...7:1 8 Index Content

HCEN12073 rev 05.2006

1 Introduction 1.1 Intended use The Gambro WRO water purification unit is designed to be used as a dialysis accessory device to produce water used to prepare and dilute dialysis concentrate to form dialysis fluid by using the reverse osmosis concept. It is intended for use in conjunction with one dialysis machine, provided that the input flow and pressure demands correspond to the output of the WRO unit.

Fig.1.1 Views of the WRO 300.

1.2 Description of reverse osmosis Reverse osmosis is a membrane filtration process and is the most widely used technique for the purification of water for dialysis. The critical part of a reverse osmosis system is the semipermeable membrane, i.e. a membrane which allows the passage of water but retains most of the dissolved salts, particles, bacteria and pyrogens. When the water is brought into contact with such a membrane and a high pressure is applied, water will flow through the membrane (Fig.1.2) but most of the other constituents will remain on the original side of the membrane and be flushed to drain.

Pressure

Feed water

Reject water

Membrane

Product water

Fig.1.2 Principal of reverse osmosis HCEN12073 rev 05.2006

Introduction

1:1

1.3 General function 1.3.1 Water purification Tap water contains many types of contaminants such as dissolved inorganics and organics, particles, bacteria and pyrogens. A dialysis patient is exposed to very large amounts of dialysis fluid that come into close contact with the patient´s blood. A large number of substances present in tap water have been proven to have a negative effect on the dialysis patient. It is therefore evident that much higher standards must be set for water used in the preparation of dialysis fluid than for tap water. Water used for dialysis must therefore be purified. The principal flow diagram is shown in Fig.1.3. A high-pressure pump feeds the pretreated water into the RO module. The pressure forces part of the water through the membrane where most of the contaminants are retained. The product water (permeate) then leaves the RO module through the product water outlet. The rest of the water containing the retained contaminants (reject) leaves the RO module through the reject water outlet and is then diverted to drain or back to the tank. The percentage value set for the water save function is how much of the reject water that goes back to tank. Excess product water and part of the reject water are recirculated to further reduce water consumption and to ensure high flow velocity over the membrane surface.

Drain outlet Product water outlet

Feed water inlet Product water return

to dialysis machine

Y coupling Flow pump RO module Fig.1.3 Principal of WRO 300

Pretreatment An acceptable quality of the feed water is required, i.e. in accordance to “Technical data” on page 5:1. The feed water is usually pretreated with such as active carbon filters, softener, and particle filters before it is supplied to the WRO. Depending on the local water quality and regulations different pretreament equipment may be required.

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Introduction

HCEN12073 rev 05.2006

1.4 Water quality 1.4.1 Microbiology The microbiological quality of the dialysis fluid is a function of a number of factors. Neglecting only one of these could result in a poor water quality. Example of these factors are •

Adequate feed water quality

•

Regular and pro-active disinfection of the WRO

•

Correct arrangement of the drain lines, i.e. air gap to avoid microbiological contamination from the drainage system.

Chemical quality To get an indication of the water quality, the WRO measures the conductivity of the water (expressed in microsiemens per cm, μS/cm). The conductivity measures of the amount of dissolved salts in the water. The conductivity should mainly be used as an indicator of the performance of the reverse osmosis system. CAUTION The conductivity value does not always indicate the suitability of the water for dialysis. For example aluminium may be present in concentrations well exceeding recommended standards without affecting the conductivity. Therefore the quality of the water, used for dialysis, should be verified by regular water analyses.

NOTE The regulations and guidelines on the quality requirements for dialysis water varies in different countries around the world. The EUROPEAN PHARMACOPOEIA has issued rules (1992) that regulates the microbiological as well as the chemical requirements for water for dialysis in Europe, as well as analysis methods to be used both for the microbiological and chemical testing of water.

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Introduction

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Introduction

HCEN12073 rev 05.2006

2 Service & Technicians guide 2.1 Overview Operator’s Panel Casing

Chemical intake Flow block unit Flow pump unit CPU and AC relay board

Power supply unit Heaters RO-module

Casing

EMC plate Tank unit

Fig.2.1 WRO 300 H overview Operator’s Panel Casing

Flow block

Chemical intake

Flow pump unit CPU board EMC plate Power supply unit

RO-module

Casing

Tank unit

Fig.2.2 WRO 300 overview

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2.2 Flow diagram C1 = Conductivity sensor in feed water line C2 = Conductivity sensor in product water line T3

F = Flow indicator T1 = Temperature sensor in product water line T2 = Temperature sensor in reject water line T3 = Temperature sensor in return overflow water line

C1

Feed water Return overflow valve

F

T2

Inlet valve Heater A Tank air vent

T1

Spray nozzle

Loop

L.H.

Chem pump

Product water

Flow meter Heater B

Drain

Tank unit

Chemical Connector

C2

L.L.

Flow pump

RO module

Chem intake

Optical Sensor

L.E.

Needle valve

LH = High level sensor LL = Low level sensor LE = Empty level sensor

Reject valve

Flow valve

Bypass valve Drain outlet

Drain

Fig.2.3 Flow diagram for WR 300 H

C1 = Conductivity sensor in feed water line C2 = Conductivity sensor in product water line

T1 = Temperature sensor in product water line

C1

Feed water Return overflow valve Inlet valve Tank air vent

Loop

Product water

Tank unit L.L.

Optical Sensor

C2

L.H.

Chem pump Drain Chemical Connector

T1

Spray nozzle

Flow pump

RO module

Chem intake L.E.

Needle valve

LH = High level sensor LL = Low level sensor LE = Empty level sensor

Reject valve

Flow valve

Bypass valve Drain outlet

Drain

Fig.2.4 Flow diagram for WRO 300

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2.3 Functional description 2.3.1 RUN mode C1 = Conductivity sensor in feed water line C2 = Conductivity sensor in product water line T3

F = Flow indicator T1 = Temperature sensor in product water line T2 = Temperature sensor in reject water line T3 = Temperature sensor in return overflow water line

C1

Feed water Return overflow valve

F

T2

Inlet valve Heater A Tank air vent

Loop

Product water

Flow meter Heater B

Drain

Tank unit L.L.

Optical Sensor

C2

L.H.

Chem pump

Chemical Connector

T1

Spray nozzle

Flow pump

RO module

Chem intake L.E.

Needle valve

LH = High level sensor LL = Low level sensor LE = Empty level sensor

Reject valve

Flow valve

Bypass valve Drain outlet

Drain

Fig.2.5 Flow during operation

Initiate The WRO is started when is pressed for three seconds. In WRO 300 H a temperature check (T2) in the reject water line is always performed before starting in RUN mode. If the temperature is above 45 ºC a cooldown is performed in the same way as Active Cooldown, refer to “Active cooldown” on page 2:6. The inlet valve opens to enter feed water into the tank. When the water level is above the Low level sensor (LL) the Flow pump starts, the speed ramps up during the initial 2-3 seconds, and feeds the water to the RO module. The product water is distributed from the RO module through the product water loop. Excess water not consumed by the dialysis machine will return to the tank via the Return overflow valve. The pressure in the product water loop depends on the amount of return flow. The reject water from the RO module is partly diverted to the Reject valve through the Flow valve and partly back to the Flow pump through a needle valve. Auto flush During Standby an Auto flush is regularly performed, if enabled in preset, within specified intervals to exchange the water in the WRO. The Auto flush circulates the water in the WRO within specified preset intervals, some water goes to drain and the inlet valve opens to enter water into the tank. The preset of Auto flush in GXP software is done by setting two time values. One to specify the time between the Flushes and the other for how long the Flush should last. Refer to “Auto flush” on page 2:41.

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Water save function The three-way Reject valve alternates continuously to be opened to drain or open to tank. Water saving functionality can be obtained by a percentage value being set. This determines how much of the time the Reject valve is open to the tank. The settings of the Water saving function can be done in the software GXP. Refer to “Water save” on page 2:35. During the initial two minutes in the start up phase the Water save function is disabled and all reject water goes to drain. RO module

Water saving function back to tank Reject valve

Needle valve

Flow valve

Water saving function to drain

Bypass valve

Drain outlet

Drain

Water level in tank During RUN mode the inlet valve opens when the level is below Low level sensor (LL) allowing water to enter the tank. The inlet valve closes again when the water reaches the High level sensor (LH). If no water is indicated by Empty level sensor, the Flow pump stops and flashes fast. If the Empty level sensor indicates no water at the same time as the Low level sensor indicates water, the Reject valve opens for five seconds back to the tank. The water flushes the Empty level sensor when it enters the tank to remove any air bubbles. Stop (to Standby mode) The WRO is stopped when is pressed. The Bypass valve opens to release the pressure and the Reject valve is open to drain. After ten seconds the inlet valve function stops to control the water level. The tank is emptied until the level is below the Low level sensor. Then the Flow pump stops and the WRO is in Standby mode. Conductivity measurement During RUN mode the product water conductivity is supervised (C1).The values from Conductivity sensors C1 and C2 are used to calculate rejection rate. During the start-up phase a peak test is performed to confirm the function of the conductivity sensor in the product water line. During Standby mode or when the WRO has been turned off the salt concentration increases in the product water side in the RO module and this generates a peak in the conductivity value that is detected by the program.

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2.3.2 Heat disinfection (only WRO 300 H) C1 = Conductivity sensor in feed water line C2 = Conductivity sensor in product water line T3

F = Flow indicator T1 = Temperature sensor in product water line T2 = Temperature sensor in reject water line T3 = Temperature sensor in return overflow water line

C1

Feed water Return overflow valve

F

T2

Inlet valve Heater A Tank air vent

Loop

Product water

Flow meter Heater B Tank unit L.L.

Optical Sensor

C2

L.H.

Chem pump Drain Chemical Connector

T1

Spray nozzle

Flow pump

RO module

Chem intake L.E.

Needle valve

LH = High level sensor LL = Low level sensor LE = Empty level sensor

Reject valve

Flow valve

Bypass valve Drain outlet

Drain

Initiate When is pressed for three seconds HEAT SELECT is displayed. Select the Heat disinfection program with the arrow buttoms and press for three seconds. The water in the tank is adjusted slightly above the Low level sensor. If no water enters the tank the alarm 302 INSUFFICIENT WATER SUPPLY is issued. Function check of temperature measurement Both reject return(T2) and product (T1) water temperature amplifiers are checked for range and offset errors. The sensors are then checked for short or open circuit. Function check of Heater protection Next step is to test the heater control and flow supervision circuits. Both circuits are tested for power on and power off. Normal test time is about one minute. If stable flow cannot be reached within five minutes an alarm is issued. After this function check the Heat disinfection is started. Start of Heat disinfection The Flow pump starts with the Bypass and Return overflow valves opened, which make the system pressureless. The Heater A in the reject water line is activated followed by the Heater B in the product water line, which is activated when the flow is above 200 ml/min. The chemical pump is circulating the water in the chemical intake unit during the Heat disinfection. The default preset value of the set temperature in reject and product water lines are 92 ºC, refer to “Heat Set temperature” on page 2:37. After acheiving 92 ºC in the reject water line the Heat disinfection continues for 20 minutes. During the Heat disinfection the water level in the tank increases with the temperature. If it reaches the High level sensor the Reject valve will open to drain for a few seconds to lower the level. During Heat disinfection it is supposed to be no water consumption, otherwise the alarm 304 INCORRECT WATER LEVEL is issued. HCEN12073 rev 05.2006

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Active cooldown The default preset is to run Active cooldown after the Heat disinfection is finished. The Flow pump circulates the water and the drain opens for three seconds. Then the inlet valve is open until the water reaches the High level sensor. After 20 seconds the temperature is checked and if it is below 45 ºC the Active cooldown is finished. Otherwise the procedure is repeated until the temperature is below 45 ºC. Then the WRO 300 H goes to Standby mode. Cooldown If Active cooldown is not selected the WRO 300 H goes to Standby and the temperature decreases slowly. Stop during Heat disinfection To stop the Heat disinfection press for three seconds. An Active cooldown is performed, if selected. When the Active cooldown is finished the WRO goes to Standby mode. If Active cooldown is not selected in the preset the WRO 300 H goes dirtectly to Standby mode.

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2.3.3 Low flow heat (only WRO 300 H) C1 = Conductivity sensor in feed water line C2 = Conductivity sensor in product water line T3

F = Flow indicator T1 = Temperature sensor in product water line T2 = Temperature sensor in reject water line T3 = Temperature sensor in return overflow water line

C1

Feed water Return overflow valve

F

T2

Inlet valve Heater A Tank air vent

Loop

Product water

Flow meter Heater B

Drain

Tank unit L.L.

Optical Sensor

C2

L.H.

Chem pump

Chemical Connector

T1

Spray nozzle

Flow pump

RO module

Chem intake L.E.

Needle valve

LH = High level sensor LL = Low level sensor LE = Empty level sensor

Reject valve

Flow valve

Bypass valve Drain outlet

Drain

Initiate When is pressed for three seconds HEAT SELECT is displayed. Select Low flow heat program with the arrow buttoms and press for three seconds. The water in the tank is adjusted slightly above the Low level sensor. If no water enters the tank the alarm 302 INSUFFICIENT WATER SUPPLY is issued. Then the checks of temperature measurement and Heaters protection are performed, refer to “Function check of temperature measurement” on page 2:5 and “Function check of Heater protection” on page 2:5. Start The Flow pump and Heater B are turned on. The temperature is controlled to 83 °C (preset value, refer to “Low flow heat” on page 2:38) by adjusting the flow through the Heater B. The product water flow depends on Mains Voltage (100, 115 or 220240 V AC) and the temperature of the feed water. Water level during Low flow heat The water level in the tank will decrease during Low flow heat as the dialysis machine consumes water. After eight seconds the inlet valve opens until the water reaches the High level sensor. If the water level goes below the Low level sensor the Heater B is turned off and if it goes below the Empty level sensor the Flow pump is also stopped. RO membrane protection In the Low flow heat mode a pressure is created in the RO module. To avoid damage of the membrane the temperature has to be below 45 ºC. If no water is consumed, hot water will return through the return overflow line to the tank. If the temperature in the reject water line (T2) reaches 40 ºC the Low flow heat will turn off and the WRO goes to Standby mode. HCEN12073 rev 05.2006

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2.3.4 Chemical disinfection and cleaning C1 = Conductivity sensor in feed water line C2 = Conductivity sensor in product water line T3

F = Flow indicator T1 = Temperature sensor in product water line T2 = Temperature sensor in reject water line T3 = Temperature sensor in return overflow water line

C1

Feed water Return overflow valve

F

T2

Inlet valve Heater A Tank air vent

Loop

Product water

Flow meter Heater B

Drain

Tank unit L.L.

Optical Sensor

C2

L.H.

Chem pump

Chemical Connector

T1

Spray nozzle

Flow pump

RO module

Chem intake L.E.

Needle valve

LH = High level sensor LL = Low level sensor LE = Empty level sensor

Reject valve

Flow valve

Bypass valve Drain outlet

Drain

Fig.2.6 Flow during chemical disinfection or cleaning.

It is recommended to disconnect the dialysis machine from the WRO before performing Chemical disininfection or Cleaning. CAUTION If the WRO is not disconnected from the dialysis machine during the Chemical disinfection procedure, the test for residuals after the Chemical disinfection procedure must be performed on the dialysis machine according to the operator’s manual of this device.

Initiate An optical sensor detects when the disinfection wand is inserted into the chemical intake unit. The Flow pump stops the circulation if not the WRO already is in Standby mode. CHEM SELECT is displayed and starts to flash (medium). Then the operator has to choose which protocol (presetted chemical procedures, refer to “Disinfection protocol manager” on page 2:38) to use. Select protocol to use and press for three seconds. Intake phase In the program the Chem flag is set to TRUE and this internal setting will only change to FALSE when the procedure is completed. The level in the tank is adjusted to be just above the Low level sensor. The Flow pump start and is running until the Low level sensor indicates air, then the Flow pump stops and the inlet valve opens and enters water until Low level sensor indicates water again. The Chemical pump runs until the presetted amount of chemical solution has entered into the tank. During the chemical intake the Flow pump circulates the fluid in the flow path. When the chemical intake is finished the Flow and Chemical pump stop the circulation in the WRO and 401 REMOVE WAND is displayed. After ten seconds and when the disinfection wand is disconnected the tank is filled up to the High level sensor. In chemical disinfection mode the bypass valve is closed, but in Cleaning mode the bypass valve is open. The Flow pump starts the circulation through the RO module, the chemical pump starts the circulation through the chemical intake unit and 2:8

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Return overflow valve opens. The circulation in the flow path will continue for one minute. Then the speed of the Flow pump is reduced and the bypass valve opens (only Chemical disinfection) and Reject valve opens to drain. Both valves closes and both pumps stops when the level is below the Low level sensor. If the procedure is interrupted the WRO always remember that the chemical procedure has been started. A rinse is always required after an interruption. RINSE is displayed and the alarm 404 RINSE REQUIRED appears. The rinse must be completed before the Chem flag is set to FALSE. Dwell period If the intermittent Run is disabled (in the preset, refer to “Default setting of disinfection protocols” on page 2:40) no circulation will be performed in the flow path. If the intermittent Run is enabled (in the preset) circulation will be performed in the flow path according to the settings of circulation time and stop time. During dwell period the procedure can be interrupted by pressing for three seconds and the WRO continues to rinse phase. Rinse The rinse phase consists of three parts that is repeated until the presetted rinse time is fulfilled. The three steps are. •

The Flow pump start at low speed. Bypass valve opens and Reject valve opens to drain. The Flow pump stops and the valves closes when the level is below Empty level sensor. Then the inlet valve is open until the water reach High level sensor. Then these steps are repeated six times.

•

The Flow pump circulate the fluid in the WRO for two minutes with Return overflow valve open and Reject valve open to tank. The Chemical pump is also running.

•

The Flow pump and valves closes and the circulation stops for one minute.

During the final five minutes of the rinse the conductivity value is checked in the Product water line. If the value is below the notification limit the rinse will be finished within the presetted rinse time. Otherwise the rinse will be extended with 30 minutes. As soon as the conductivity value is below the notification limit the extended rinse procedure will be finished. If the conductivity value still is above the notification limit after 30 minutes the alarm 403 HIGH CONDUCTIVITY RINSE will be displayed.

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2.3.5 Preservation with freeze protection The intake of the preservation solution is done through the Feed water inlet. An external pump is required to enter the solution into the tank. C1 = Conductivity sensor in feed water line C2 = Conductivity sensor in product water line T3

F = Flow indicator T1 = Temperature sensor in product water line T2 = Temperature sensor in reject water line T3 = Temperature sensor in return overflow water line

C1

Feed water Return overflow valve

F

T2

Inlet valve Heater A Tank air vent

T1

Spray nozzle

Loop

L.H.

Chem pump

Product water

Flow meter Heater B

Drain

Tank unit

Chemical Connector

C2

L.L.

Flow pump

RO module

Chem intake

Optical Sensor

L.E.

Needle valve

LH = High level sensor LL = Low level sensor LE = Empty level sensor

Reject valve

Flow valve

Bypass valve Drain outlet

Drain

Fig.2.7 Flow diagram during Preservation mode.

An optical sensor detects when the disinfection wand is inserted into the chemical intake unit. The Flow pump stops the circulation if not the WRO already is in Standby mode. CHEM SELECT is displayed and starts to flash. Then the operator has to choose a protocol for preservation (presetted chemical procedures). Select protocol to use and press for three seconds. NOTE The disinfection wand is only inserted to initiate the CHEM SELECT. The preservation solution enters via the Feed water inlet.

The intake phase starts by pressing for three seconds and INTAKE displays. The intake phase for preservation consist of three parts as below. •

The inlet valve is open until the water reach the High level sensor. The Flow pump start at low speed. Bypass valve opens and Reject valve opens to drain. The Flow pump stops and the valve closes when the level is below Empty level sensor. These steps are repeated six times and then 501 REMOVE WAND is displayed.

•

When the disinfection wand is disconnected the Flow pump circulate the fluid in the WRO for five minutes with the Bypass valve closed, Return overflow valve open and Reject valve opens to tank. The Chemical pump is also running.

•

When the circulation is completed the Bypass valve opens and Reject valve opens to drain until the level in the tank is below Low level sensor.

When the preservation procedure is completed the alarm 404 RINSE REQUIRED appears in the display.

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