Volvo Emissions Oraz Adblue System

Operacja nrData publikacji

Saturday, 11 July 2009

Identyfikator

124664056Model

FH

Ścieżka

25/Description, Design and function/FH,D16E660/Emissions aftertreatment system

Identyfikator podwozia

Emissions aftertreatment system

General

SCR technology (Selective Catalytic Reduction) — catalytic exhaust aftertreatment — is used tofulfill the requirements of Euro 4, the new standard for exhaust gas emissions that came into forceon 1 October 2006. The difference between Euro 4 and the previous Euro 3 requirements is thatnitrogen oxides (NO ) must be reduced by 30% and particulate emissions by 80%.x

Diesel engines with even more efficient combustion in combination with exhaust gas aftertreatment,result in considerably reduced emissions of nitrous oxides and particulate matter.

SCR technology is based on treating the exhaust gases by adding an AdBlue solution. The solutionis injected into the exhaust gases before they pass through the catalytic converter. This additivecauses the nitrous oxides to be converted into nitrogen gas and steam, substances that occurnaturally in our environment. To meet the Euro 4 requirements, a 3–4% AdBlue solution in relationto the volume of fuel is needed.

The Euro 4 engine has been developed for more efficient levels of combustion and its enginecontrol unit calculates the optimal amount of AdBlue solution to be injected in relation to currentload and engine speed.

IMPACT 3.0 Tuesday, 22 June 2010

© Copyright Volvo Parts CorporationInformacje, które zostały tutaj podane są aktualne w czasie pierwszej dystrybucji, jednak mogą ulec zmianie. Należy pamiętać, że kopie drukowane nie są

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The new EU emission requirements mean a drastic reduction in the emission of particulates (PM) and nitrous oxides(NO ).x

Principle solution



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Main components

SCR exhaust gas cleaning is a simple system with few components: AdBlue tank (1), pump unit (2),dosing unit (3) and a silencer (4) with built-in SCR catalytic converter.



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1.

Principle solution

The AdBlue solution is atomised and injected into the exhaust gases before the catalytic converter(5). Precise injection is controlled by the EMS (Engine Management System) which guarantees theoptimal reduction of emissions in all operating conditions.

The heat in the exhaust system breaks down AdBlue into ammonia and carbon dioxide. Ammoniais the active substance and the key ingredient in the chemical process which takes place in thecatalytic converter, in which nitrogen oxides (NO ) are converted into a harmless mix of nitrogenxand water vapour. This chemical reaction takes place at temperatures above 200°C.

Variants

The SCR system is available in two versions:

With electric cooling control valve — earlier versionWithout cooling control valve — later version

As the systems differ, sometimes both versions are described in the document.

The path of the AdBlue solution

Summary — with electric cooling control valve

Outline diagram — with electric cooling control valve

The illustration shows the main components of the aftertreatment system and its pipingconnections.



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1. 2. 3. 4. 5. 6. 7. 8. 9.

10. 11. 12. 13. 14. 15. 16.

AdBlue tank (AdBlue tank)Level sensor, AdBlue tankTemperature sensor, AdBlue tankPump, AdBlue solutionFilter, AdBlue solutionPressure sensor, AdBlue solutionTemperature sensor, AdBlue solutionMID233 control unit, AdBlue dosing systemFilterFlow direction valveElectric cooling control valveNon-return valveDosing unitExhaust temperature sensorCatalytic converterNO sensor (only used for OBD — On Board Diagnostics)x

The entire SCR system is controlled by the MID128 engine control unit (EECU — Engine ElectronicControl Unit), which communicates via a separate control unit — MID233 — for the AdBlue dosingsystem.

Normal operation — with electric cooling control valve

The control unit (8) receives a signal from the AdBlue tank level sensor (2) that the AdBlue solutionis above the set minimum level. The control unit activates the flow direction valve (10) and startsthe pump (4) which draws the AdBlue solution from the tank (1) through the filter (9) and flowdirection valve (10). The pump then forces the AdBlue solution through the flow direction valve tothe AdBlue filter (5) and onto the dosing unit (13) on the silencer.

When a number of criteria have been met (such as pressure sensor (6) detecting the workingpressure in the AdBlue dosing system has reached approximately 5 bar) the engine control unitsends a signal about the AdBlue volume to the control unit (8) which opens dosing valve (13). TheAdBlue solution is injected into the exhaust pipe before the silencer with its built-in SCR catalyticconverter (15). At the same time the coolant control valve (11) is opened and the excess AdBluesolution is fed back to the tank.

The high exhaust gas temperature breaks down the AdBlue and a chemical reaction takes place inthe catalytic converter which transforms the gases into harmless nitrogen and water. The NO xsensor (16) measures the nitrogen oxide (NO ) content in the exhaust gases. If the approvedxemissions level is not maintained, a warning lamp lights in the instrument panel and a fault code isstored in the engine control unit.

The task of the exhaust gas temperature sensor (14) is to measure the exhaust gas temperature inthe catalytic converter so that the correct amount of AdBlue solution is added to the exhaust gases.



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Since the AdBlue solution is temperature-sensitive, the AdBlue tank is heated by a heating loopcontaining engine coolant in the tank. The hoses to and from the tank are heated electrically andthere is additional insulation around the hose connections. A temperature sensor (3) continuouslymonitors the temperature of the AdBlue solution and signals the control unit (8) if the temperaturefalls below 10°C. The control unit then activates solenoid valve (17) which opens and allows hotengine coolant to pass through the AdBlue tank heating loop. When the circulating AdBlue solutionreaches a temperature of 15°C the temperature sensor (3) sends a signal to the control unit (8)which closes the solenoid valve and shuts off the heating.

If the system detects a fault that affects the injection, a warning lamp (OBD) is lit and a fault code isstored in the engine electronic control unit memory.

If the fault results in the circulation of AdBlue solution being shut off, a warning lamp (CHECK) isalso lit

together with the following text:

Further drivingwill damage the SCR system

Low level in the tank — with electric cooling control valve



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Low level in the AdBlue tank

If, in normal operation, the level of the AdBlue solution falls to the minimum level of the tank, awarning symbol informs the driver that it is time to top up the AdBlue solution.

Fill up with AdBlue

min. max.

If the AdBlue solution is not replenished the level sensor (2) in the tank sends a signal that closesthe dosing valve (13). Injection of AdBlue solution into the exhaust pipe ceases.

The cooling control valve (11) is opened and the remaining AdBlue solution in the tank is allowed tocirculate and cool the dosing valve. A warning lamp (the OBD symbol) lights in the instrument panel

and warning text indicates that the AdBlue tank is empty.



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AdBlue tank empty

min. max.

A fault code is stored in the engine electronic control unit memory.

When the AdBlue solution is topped up, the OBD lamp and the fault message go out, but the faultcode is saved and can be accessed using the diagnostic instrument.

Normal shutdown — with electric cooling control valve

AdBlue injection stopped

When the engine is switched off the current is switched off. The AdBlue pump stops and thepressure in the AdBlue system drops. The control unit (8) closes the cooling control valve (11),opens the non-return valve (12) and closes the dosing valve (13).

The control unit inactivates the flow direction valve (10), which through spring-pressure, switches to. After this, the control unit starts the pump and drains the AdBlue system (dosing system,cross-flow

return line, pressure line and filter) and pumps the AdBlue solution back into the tank. The pressuresensor (6) sends a signal to the control unit when the system has been drained.

The control unit also opens the dosing valve briefly to empty the dosing unit and any remainingAdBlue solution in the injector runs out into the silencer.

This draining ( ) takes place completely automatically and the complete shut-downafter-run



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1. 2. 3. 4. 5. 6. 7. 8. 9.

10. 11. 12. 13. 14. 15. 16.

sequence takes approx. 90 seconds. The system is drained of AdBlue solution and depressurised.

Note: Small amounts of AdBlue solution may remain in bends in the hoses etc., which is important to remember if thehoses are to be disconnected.

Summary — without cooling control valve

Outline diagram — without cooling control valve

The illustration shows the main components of the aftertreatment system and its pipingconnections.

AdBlue tank (AdBlue tank)Level sensor, AdBlue tankTemperature sensor, AdBlue tankPump, AdBlue solutionFilter, AdBlue solutionPressure sensor, AdBlue solutionTemperature sensor, AdBlue solutionMID233 control unit, AdBlue dosing systemFilterFlow direction valveTubeNon-return valve with restrictionDosing unitExhaust temperature sensorCatalytic converterNO sensor (only used for OBD — On Board Diagnostics)x

The entire SCR system is controlled by the MID128 engine control unit (EECU — Engine Electronic



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Control Unit), which communicates via a separate control unit — MID233 — for the AdBlue dosingsystem.

Normal operation — without cooling control valve

The control unit (8) receives a signal from the AdBlue tank level sensor (2) that the AdBlue solutionis above the set minimum level. The control unit activates the flow direction valve (10) and startsthe pump (4) which draws the AdBlue solution from the tank (1) through the filter (9) and flowdirection valve (10). The pump then forces the AdBlue solution through the flow direction valve tothe AdBlue filter (5) and onto the dosing unit (13) on the silencer.

When a number of criteria have met (such as pressure sensor (6) detecting that the workingpressure in the AdBlue dosing system has reached approximately 5 bar) the engine control unittransmits a signal about the AdBlue volume to the control unit (8) which opens dosing valve (13).The AdBlue solution is injected into the exhaust pipe upstream of the silencer with its built-in SCRcatalytic converter (15). At the same time, the excess AdBlue solution is fed via the restriction (12)back to the tank.

The high exhaust gas temperature breaks down the AdBlue and a chemical reaction takes place inthe catalytic converter which transforms the gases into harmless nitrogen and water. The NO xsensor (16) measures the nitrogen oxide (NO ) content in the exhaust gases. If the approvedxemissions level is not maintained, a warning lamp lights in the instrument panel and a fault code isstored in the engine control unit.

The task of the exhaust gas temperature sensor (14) is to measure the exhaust gas temperature inthe catalytic converter so that the correct amount of AdBlue solution is added to the exhaust gases.

Since the AdBlue solution is temperature-sensitive, the AdBlue tank is heated by a heating loopcontaining engine coolant in the tank. The hoses to and from the tank are heated electrically andthere is additional insulation around the hose connections. A temperature sensor (3) continuouslymonitors the temperature of the AdBlue solution and signals the control unit (8) if the temperaturefalls below 10°C. The control unit then activates solenoid valve (17) which opens and allows hotengine coolant to pass through the AdBlue tank heating loop. When the circulating AdBlue solutionreaches a temperature of 15°C the temperature sensor (3) sends a signal to the control unit (8)which closes the solenoid valve and shuts off the heating.

If the system detects a fault that affects the injection, a warning lamp (OBD) is lit and a fault code isstored in the engine electronic control unit memory.

If the fault results in the circulation of AdBlue solution being shut off, a warning lamp (CHECK) is



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also lit

together with the following text:

Further drivingwill damage the SCR system

Low level in the tank — without cooling control valve

Low level in the AdBlue tank

If, in normal operation, the level of the AdBlue solution falls to the minimum level of the tank, awarning symbol informs the driver that it is time to top up the AdBlue solution.



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Fill up with AdBlue

min. max.

If the AdBlue solution is not replenished the level sensor (2) in the tank sends a signal that closesthe dosing valve (13). Injection of AdBlue solution into the exhaust pipe ceases.

The AdBlue solution remaining in the tank circulates through the restriction (12) and cools thedosing valve. A warning lamp (the OBD symbol) lights on the instrument panel

and warning text indicates that the AdBlue tank is empty.

AdBlue tank empty

min. max.

A fault code is stored in the engine electronic control unit memory.

When the AdBlue solution is topped up, the OBD lamp and the fault message go out, but the faultcode is saved and can be accessed using the diagnostic instrument.

Normal shutdown — without cooling control valve



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AdBlue injection stopped

When the engine is shut down the current is switched off. The AdBlue pump stops and the pressurein the AdBlue system drops. The control unit (8) closes the dosing valve(13).

The control unit de-energises the flow direction valve (10), which by spring pressure switches to . After this, the control unit starts the pump and drains the AdBlue system (dosing system,cross-flow

return line, pressure line and filter) and pumps the AdBlue solution back into the tank via thenon-return valve (12), which now opens. The pressure sensor (6) sends a signal to the control unitthat the system is empty.

The control unit also opens the dosing valve briefly to empty the dosing unit and any remainingAdBlue solution in the injector runs out into the silencer.

This draining ( ) takes place completely automatically and the complete shut-downafter-runsequence takes approx. 90 seconds. The system is drained of AdBlue solution and depressurised.

Note: Small amounts of AdBlue solution may remain in bends in the hoses etc., which is important to remember if thehoses are to be disconnected.

Trucks approved for ADR

Trucks with ADR permission

ADR = Accord européen pour le transport de marchandises Dangereuses par Routetransport dangerous goods and for safety reasons there is a main circuit breaker for the electricalsystem in the cab. As this also cuts off power to the AdBlue pump, it must be used in thenotworkshop when servicing without first pumping out the AdBlue system in the normal way byswitching off the ignition.



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If the AdBlue system is not drained properly, the residual pressure in the hoses will spray outAdBlue solution if a hose is disconnected. Another risk of residual AdBlue solution in hoses, is thatthe system can freeze and burst if the outside temperature falls below -11°C.

Warning

Avoid using the ADR switch before the AdBlue system has been drained, except in a case ofemergency!

Tank

AdBlue solution is stored in a separate tank, located on the left or right-hand side of the vehicle,adjoining the diesel tank where possible.

Examples of the location of the AdBlue tank

The AdBlue solution tank is made of plastic or stainless steel and is available in various sizes.



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Steel tank with a heating loop or plastic tank for the AdBlue solution.

Both plastic and steel tanks are fitted with vents to equalise pressure changes. The earlier versionof the plastic tank is fitted with a level sensor on its rear edge. The newer version has a float. Thesteel tank has a combined tank unit with a float. Underneath is a drain plug so that the AdBluesolution can be drained when necessary, for example when cleaning, replacing the level sensor,etc.



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The earlier version of the plastic AdBlue tank with a level sensor on its rear edge.

The opening in the tank unit suction pipe is fitted with a filter to prevent particles from circulating inthe system and causing stoppages. This filter should be checked and cleaned as necessary.

Tank unit with inlet strainer (1). Tank unit with inlet strainer (1) and float (2).

Heating the AdBlue solution



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Heating the AdBlue solution

Since the AdBlue solution freezes at -11°C, the tank is fitted with a heating loop carrying coolantfrom the engine. On the frame, close to the tank, is a solenoid valve which regulates the flow ofcoolant. In addition, the hoses between the tank and the pump unit are heated electrically and thehose connections have extra insulation.



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Steel AdBlue tank with heating loop. Plastic AdBlue tank with heating loop.



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Location of solenoid valves on FM and FH trucks

A temperature sensor sends a signal to the control unit, so that the pump cannot start until theAdBlue solution is liquid. The standard system can be thawed out down to -40°C. To preventexpansion damage in case of freezing, the AdBlue system is drained when the ignition is switchedoff.

A return line and a suction line are connected between the AdBlue tank and the pump unit. TheAdBlue tank's combined temperature and level sensor is connected to the control unit and the levelsensor value can be read off from the vehicle's instrument panel.

AdBlue consumption varies with driving conditions and a text message reminder to top up the tankis displayed when approx. 10% of the effective tank volume remains. When there is approx. 5 litresof AdBlue solution left, the tank is considered to be empty. If this occurs, a fault code is set in theengine control unit, and a warning text that the tank is empty is displayed in the instrument panel.

If the AdBlue tank becomes empty while the vehicle is being driven, it will not damage the SCRsystem or the engine as the remaining AdBlue solution circulates and cools the system. However,emissions increase when the dosing valve is closed and the exhaust gases are not treated.

Note: It can be illegal to drive a vehicle without a functional exhaust aftertreatment system.

Filling AdBlue solution

Filling AdBlue solution



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To prevent other liquids than AdBlue from being poured into the AdBlue tank by mistake, the tankmouth and tank hole are designed so that they will not accept any other filling equipment.

Note: To avoid confusion when filling with diesel or AdBlue solution the AdBlue tank has a cap. A special AdBluebluelabel is also fixed to the AdBlue tank.

The filler caps for diesel and AdBlue solution are different sizes to further prevent confusion.

The AdBlue tank filler pipe is also fitted with a magnetic loop (1). This means that the filling nozzleonly opens when it detects the magnetic loop in the tank.

Take care not to fill the fuel tank with AdBlue solution when standard filling equipment is not beingused. This will contaminate the fuel and cause AdBlue solution to enter the injection system andcombustion chambers, which can damage the engine.

When filling AdBlue solution directly from an open container, be careful not to spill any as AdBluesolution will corrode many materials.

Caution

Filling diesel, water, other liquids or other AdBlue solutions than Volvo specified AdBlue (ISO22241-1) in the AdBlue tank will cause a breakdown of the exhaust after-treatment system.Never start the engine if you have filled anything other than pure AdBlue solution into theAdBlue tank!



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AdBlue

Only Volvo approved AdBlue, conforming to ISO standard 22241–1 (previously DIN-70070) is to beused in the exhaust aftertreatment system.

Caution

Using an AdBlue solution not approved by VOLVO will damage the aftertreatment systempermanently. Engine output will be negatively affected and other engine components alsorisk being damaged.

AdBlue consists of 32.5% urea crystals and 67.5% deionised water. It is a transparent, clear fluidwith a faint smell of ammonia. The fluid is not flammable, nor is it dangerous with normal handling.However, it is highly corrosive to metal, particularly copper and aluminium. Read the separatesection concerning the handling and spillage of AdBlue solution.

Note: AdBlue solution can cause some irritation if it comes into contact with skin.



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Facts: AdBlue — ISO 22241-1 (previouslyDIN-70070)

Composition: Solution of urea indeionised (distilled) water

Ureaconcentration:

32.5% ± 0.8%

Properties: Colourless fluid. Notinflammable.Not harmful when handledcorrectly.Urea solution slowlydecomposes intoammonia and carbondioxide. Highertemperatures speed thisprocess.

Physical data: Freezing point -11°CDensity (20°C) 1090 kg/m 3

pH ~ 9

Pump unit

The pump unit includes a pump, filter housing, cooling control valve, pressure sensor, temperaturesensor and a control unit.



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1.

2. 3.

4.

5.

6.

Pump unit connectors:

INLET, AdBlue solution Tank->Pump — 9.5 mm (Connecting hose is marked red andconnected with a grey contact piece.)Drain plug screwBACKFLOW INLET, AdBlue solution Dosing unit->Pump — 9.5 mm (Connected hose ismarked white and connected with a blue contact piece.)OUTLET, AdBlue solution Pump->Dosing unit — 8 mm (Connected hose is marked black andconnected with a green contact piece.)BACKFLOW OUTLET, AdBlue solution Pump->Tank — 8 mm (Connected hose is markedyellow and connected with a black contact piece.)



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6. 7. 8.

Valve for pressure testing.Connection, control unit MID233 .Outer filter heater.

Replace the filter in the pump unit in accordance with the replacement intervals, see Service andMaintenance, Group 175.

Warning

When disconnecting hoses and components, do not spill AdBlue solution onto separatedconnectors. If this occurs, replace the connectors . Cleaning with water orimmediatelycompressed air will not help as the AdBlue solution quickly oxidises metal and due tocapillary action along cabling at a speed of about 0.6 metres/hour.creeps

Pump

Location of the pump unit on FM and FH trucks

The electrically driven pump is a membrane pump. The following components are available asspare parts:

Temperature sensor



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Pressure sensorControl valvePrimary filter

Repair instructions can be found in Impact.

The pump starts when all the starting conditions are fulfilled.

The operating pressure of the pump is approximately 5 bar (500 kPa).

When the engine is switched off the pump drains the system of AdBlue solution, which is pumpedback into the tank. This takes about 90 seconds.

To protect the pump against speed wind in very cold conditions, a windshield plate is secured byquick-fastening screws under the pump unit.

Filter housing

Filter housing

After the pump, the AdBlue solution passes through a filter housing located in the pump housing.This consists of a paper filter (1) that removes dirt particles from the AdBlue solution. There are twoporous rubber rings (2) on the filter which protect the filter housing should the damp filter paper



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freeze in extreme cold. Replace the filter and rubber rings as a spare part if necessary.

The filter is sealed by an O-ring (3). The filter housing cap (4) has an insert-type, electrical heatingelement (6) installed. This element is removed when changing the filter.

Before changing a filter the filter housing must be drained via the drain plug screw (5). Wait 90seconds before opening the drain plug, to allow time for the AdBlue solution to be pumped backinto the tank.

Note: The inlet to the pump unit contains a filter (7) which is cleaned as necessary and changed if it becomesdamaged.

Cooling control valve

The SCR system is available in two versions:

With electric cooling control valve — earlier versionWithout cooling control valve — later version

With electric cooling control valve — earlier version

On earlier versions, there is an electrically controlled cooling control valve located in the pumphousing. The cooling control valve consists of two tubes with an electric valve (1) in one of thetubes and a non-return valve (2) in the other.

The cooling control valve is also fitted with two heating elements (3) to prevent the AdBlue solutionfrom freezing.

Without cooling control valve — later version



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There is no cooling control valve in later versions. Instead, this is replaced by a non-return valvewith a restriction which is located in the dosing unit. This non-return valve consists of a ball on aspring which is pressed against a seat. The ball does not seal entirely tightly against the slot,instead there is restriction of the AdBlue flow.

There is just a tube in the pump housing where the old cooling control valve was located. Theappearance is almost identical with the cooling control valve, but without the electrical control andwithout valves inside.

Control unit

Control unit and communication

The dosing unit control unit MID233 (DECU — Dosage Electronic Control Unit) for the AdBluedosing system consists of a processor that communicates with the engine control unit MID128(EECU).

The amount of AdBlue solution to be injected is controlled by the engine control unit usinginformation from the dosing control unit, i.e. the current values from the combined level andtemperature sensor in the tank, the pressure sensor and the temperature sensor in the pump unit,and the dosing valve located before the catalytic converter.

Diagnostics and programming take place via the vehicle data link connector. VCADSPro can beused to read out fault codes from the system, for reprogramming and to run a number of tests onthe dosing system. The system does not need calibration.



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Pump unit connector unit

Dosing unit

Dosing unit location



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Dosing unit

Dosing the AdBlue solution is carried out by a dosing unit installed at an angle of 30 degrees to theexhaust gas flow. The dosing unit contains a dosing valve (injector) that injects AdBlue solution at 5bar (500 kPa) pressure into the exhaust gases before they reach the catalytic converter. Theamount of AdBlue solution depends on the engine speed and load, and is electronically controlledby the engine management system (EMS). No injection takes place if the temperature of theAdBlue solution is less than -7°C or greater than 85°C.

The dosing valve is a PWM controlled (Pulse Width Modulation) solenoid valve. It is protected fromthe hot exhaust gases by a heat shield and an air pocket. The metal body is also cooled by thecirculating AdBlue solution at maximum 85°C. The dosing unit is installed in such a way that itselectrical connections are as far away from the exhaust gas flow as possible.

The heat shield is labelled with the part number and a serial number. Using the part number, onecan read from the data sheet what is the maximum dosing amount that the injector can provide.There are three dosing units available and are ordered according to engine size. They provide: 3kg/h, 6 kg/h and 9 kg/h.

Note: The dosing unit is a sensitive component that should be handled carefully when installing and removing.

Since the AdBlue solution is temperature-sensitive it flows through hoses wound withelectrically-heated copper loops to and from the dosing unit. The hose connections are also fittedwith additional insulation against the cold.

The inlet and outlet connections have quick-release couplings of different sizes to prevent incorrectconnection.Inlet = 8 mm (black) and outlet = 9.5 mm (black).

Checks of the dosing system are performed using VCADSPro



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Note: When checking the dosing unit, avoid spilling AdBlue solution.

SCR catalytic converter

SCR catalytic converter

The exhaust gases are lead into the SCR catalytic converter built into the silencer. The catalyticconverter consists of a ceramic structure with many small channels coated with an activesubstance. Atomised AdBlue solution is injected into the exhaust pipe before the silencer and mixeswith the hot exhaust gases. The heat of the exhaust quickly decomposes the AdBlue solution intoammonia and carbon dioxide. As the exhaust gases pass through the SCR catalytic converter thereaction between the ammonia and nitrous oxides in the exhaust gases is accelerated and the finalproduct is harmless nitrogen and steam.

In the final section of the catalytic converter ( ) is a platinum coating which handlesclean upnon-reacted NH in order to prevent a smell of ammonia in the exhaust gases.3

The catalytic converter cannot be renovated or replaced as a separate item. The entire silencerassembly has to be replaced if necessary. Externally fitted components such as the NO sensor,xdosing unit and temperature sensor can be replaced.

AdBlue hoses

The AdBlue hoses are electrically heated by a thin wire wound around the hose. So as not to



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damage the heating system, handle the hoses carefully. Do not twist or kink them.

Handling AdBlue solution

When handling AdBlue solution it is important that electrical connectors are connected or wellencapsulated. Otherwise there is a risk that AdBlue will cause oxidation that cannot be removed.Water or compressed air do not help, since AdBlue quickly oxidises metal.

If a connector comes into contact with AdBlue solution it must be replaced to preventimmediatelyAdBlue solution from further into the copper wiring, which takes place at a speed of aboutcreeping60 cm per hour.



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Wrap disconnected connectors.

Advice when changing a pump unit or dosing unit

Ensure that the system is depressurised.Always detach the AdBlue hoses disconnecting the electrical connectors to preventbeforeAdBlue spillage from entering the connectors.Wrap the connections.Seal the system so that the AdBlue does not crystallise if the system remains disconnectedfor a longer period of time (several hours).

Cleaning tools and clothing



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It is important that tools and clothes are thoroughly cleaned of AdBlue solution, so that fluid orcrystals are not transferred to other components which could be damaged.

Actions with spillage

In case of – rinse with plenty of water and remove contaminated clothing.skin contact

In case of – rinse for several minutes and contact a doctor if necessary.eye contact

If – breathe in fresh air and contact a doctor if necessary.inhaled

Do not allow AdBlue solution to come into contact with other chemicals.

AdBlue solution is not flammable. If AdBlue solution is exposed to high temperatures, it breaksdown into ammonia and carbon dioxide.

AdBlue solution is highly corrosive to certain metals, including copper and aluminium.

If AdBlue solution is spilled onto the vehicle, wipe off the excess and rinse with water. SpilledAdBlue solution can form concentrated white crystals on the vehicle. Rinse off these crystals withwater.

Note: Do not flush AdBlue spillages into the normal drainage system.

Warning

AdBlue spilt onto hot components will quickly vaporise. Turn your face away!



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Volvo Emissions Oraz Adblue System

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