ssp 79 auxiliary heater

8/9/2019 SSP 79 Auxiliary Heater

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permittedunless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liability

with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S.�

Service 79

Service Training

Auxiliary heater


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2 GB

The auxiliary heater protects the engine and reduces its wear.Thanks to the auxiliary heater which preheats the engine, the pollutant emission is substantially re-

duced.On petrol engines, the production of hydrocarbons, nitrogen oxides and carbon monoxide decreases

roughly by half.


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3GB

Contents

Einleitung 4

Zusatzheizung in Škoda-Fahrzeugen 7

Thermo Top V 8

Thermo Top C 21

You will fi nd the notes for the assembly anddisassembly, diagnostic s as well as detaileduser information in the workshop manuals, thediagnostic unit VAS 505x and in the onboardliterature.

The time for going to press was on the 12/2009.This brochure is not subject to an update.

Fuel evaporator 21 Function of the system 22 Circulation pump 24 Exhaust air fan 25 Combustion chamber 26 Exhaust system 27

Operation 28

Function principle 8 Venturi nozzle 9 Control system 10 Body of the combustion unit 12 Operation 14 Wiring diagram 18 Electromagnetic valve N279 19

Fuel preheating 20 Safety conditions 20

Types of auxiliary heaters 5 Combustion conditions 6


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4 GB

Introduction

Auxiliary heater

The auxiliary heating system allows us to set theoptimal climate conditions in the vehicle interior

using the heating or ventilation mode so that thevehicle interior is already heated, if necessaryventilated, before entering the vehicle.

By using the auxiliary heating system, we preventthe frosting and fogging of the glass panes whichwould otherwise obstruct the driver's view.

Wearing heavy winter clothing in the vehicle re-duces the effectiveness of the seat belt - the playbetween the belt and the person's body increasesbecause the seat belt does no longer fit tightlyacross the body.Wearing appropriate clothing in the pre-heatedvehicle interior increases the protective effectof the seat belt and the responsiveness of thedriver.


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5GB

The auxiliary heater (further referred to as AH) ispart of a heating system which heats the inside ofthe vehicle, possibly the engine, regardless if theengine is running or not.

Auxiliary heaters are divided into two basic types:

Auxi liary hot air heater

The auxiliary hot air heater is used and installedprimarily in cabins of lorries and machines, suchas excavators, cranes, bulldozers or larger vans,ships' cabins etc.

An advantage is the rapid heating of the individ-ual area, the low consumption, a low noise leveland the possibility of countless hours of operation(depending on the capacity of the battery). A dis-advantage is the inability to preheat the unit itself.

AUXILIARY HOT AIR HEATER

The core of any such auxiliary heater is the com-bustion chamber, into which the combustion air isdirected by means of the fan and where it mixeswith the petrol and diesel fuel supplied from thefuel tank of the vehicle. The air-fuel mixture isignited by a glow plug. The resulting combustiongases are diverted by means of the exhaust sys-tem of the AH.

Auxi liary hot water heater

The hot water heater is used mainly in passengervehicles. Compared with hot-air systems, it offersthe possibility of preheating the engine itself andthe use of the ventilation distribution system.

It has compact dimensions and is placed directlyin the engine compartment.Amongst the main advantages is the aforemen-tioned possibility to heat the unit to the desiredtemperature before the actual start-up. In con-nection herewith, the consumption as well asthe emissions and not least the engine wear arereduced due to the already warmed-up engine.

AUXILIARY HOT WATER HEATER

Types of auxiliary heaters


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6 GB

Introduction

The auxiliary heater is a heating system thatburns fuel. During this process, energy is re-leased in the form of heat, which subsequentlyheats the liquid in the cooling circuit of the vehicle.

The combustion process is determined by threebasic factors:

1. Actual fuel – raw material which is convertedinto heat energy.

The fuel from the fuel tank of the vehicle isinjected into the combustion chamber of theauxiliary heater by means of the dosing pump

of the AH.

2. Actual oxygen – enables the combustion dur-ing which the fuel is converted into energy.

The air supply is ensured by means of a fanwhich is a component of the body of the auxil-iary heater.

3. Required temperature – prerequisite to en-sure the flash point.

After activating the auxiliary heater, the electriccurrent is conducted to the glow plug, whichoperates on the principle of electrical resist-ance and is heated by applying voltage.

fuel

oxygen heat

Combustion conditions

SP79_11


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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted

unless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liabilitywith respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S.�

7GB

AH in Škoda vehicles

For all the Škoda models produced in series,an auxiliary hot water heater Thermo Top V isprovided as an optional equipment.

As part of the range of Škoda Auto original ac-

cessories, an auxiliary heater can also be retro-fitted in the vehicle, in this case a Thermo TopCwater heating system.The range of original accessories also includesthe Thermo Top C version with remote control.

The table displays the options of auxiliary heat-ing systems available for the individual vehiclemodels.

The ŠkodaSuperb and Superb Combi modelscan be retrofitted with an optional Thermo Top VAH with remote control.

*** For the ŠkodaOctavia I and II models andthe ŠkodaYeti model which are equipped with theThermo Top V system, a remote control can bebought in addition from the range of Škoda Autooriginal accessories.

Series production Original accessories

Thermo Top V Remote control Thermo Top C Remote control

ŠkodaFabia – – – –

ŠkodaFabia Combi – – – –

ŠkodaRoomster – – – – ŠkodaOctavia I, II ***

ŠkodaOctavia Combi I, II ***

ŠkodaYeti ***

ŠkodaSuperb I, II

ŠkodaSuperb Combi I, II


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with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S.� 8 GB

Thermo Top V

temperature sensor

outlet of heated water

Combustion air fan

fuel supply

overheat sensor

combustion gas exhaust

heat exchanger

combustion air inlet

Venturi nozzle

The fuel from the fuel tank of the vehicle (petrol ordiesel) is transferred to the heating unit by means

of a special pump. This is where the fuel and airmixes as it enters the combustion chamber viathe venturi nozzle. The air is fed into the systemby a fan, which is located in front of the nozzle,whereas the mouth of the fan is equipped witha silencer. The glow plug which extends into thecombustion chamber is intended for the ignition ofthe mixture. The heat released during the com-bustion heats the exchanger, which in turn heatsthe water which flows through it. The exchangeris connected to the cooling circuit of the vehicle.

The circulation of the liquid in the water circuit isensured by the pump of the auxiliary heater. The

combustion gases emitted during thefi

ring proc-ess are diverted through the exhaust gas pipewhich is fitted with a silencer.The control unit of the Thermo Top V systemis a direct component of the heating unit. Thetemperature at the exchanger is monitored by twosensors - the temperature sensor and the over-heat sensor.

Function principle of the auxil iary heater

SP79_8


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9GB

fuel supply

air supply

air supply

glow plug

Venturi nozzle

On the version Thermo Top V AH, the drawn-inair is led into the combustion chamber via a ce-

ramic housing in the shape of a venturi nozzle. Insuch a way, the injection of the fuel is assisted bythe suction effect.

SP79_10

SP79_9


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10 GB

Thermo Top V

Control system of the auxiliary heater

R149 J364

W-Bus

CAN

N279

V6

LED indicator lightof the instant heatbutton of the AH

instant heatbutton of the

AH

Z66

V55

Additional output signals, e.g.J13 – fresh air blower relay

V54

G18

G189

Q8

SP79_16

*

**

* only for the model range ŠkodaSuperb I and II

** only for vehicles with diesel engines

output signal input signal databus

G18 temperature sensor

G189 overheat sensor R149 remote control receiverW–Bus special databus for the connection R149J364 auxiliary heater control unitQ8 glow plug with flame monitorV54 fuel dosing pumpV55 circulation pumpZ66 heating element for preheating the fuelV6 combustion air fanN279 shut-off valve for the coolant, heating


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11GB

Activat ion of the auxil iary heater

After activating the auxiliary heater, it is preparedfor operation.

The glow plug including the flame arrester Q8,the combustion air fan V6 and the circulationpump V55 are put into operation.

The dosing pump V54 starts after 30 secondsand the combustion air fan V6 operation issuspended for 3 seconds. Subsequently, thecombustion air fan V6 speed is increased in tworamps and increases again within 56 seconds tofull load.

After the stabilisation phase (constant speed) of15 seconds, the combustion air fan V6 speed isagain increased in a ramp within one cycle (50seconds) to around the full load.

After reaching full load during the fuel transfer,the glow plug including the flame arrester isdeactivated Q8 and the combustion air fan V6 speed stabilises itself at full load. During the next45 seconds, the glow plug including the flamearrester Q8, monitor the flame condition. Then

begins the automatically controlled heating op-eration.

In case of a no-flame condition or a flameoutbased on a malfunction, the fuel supply isstopped and the auxiliary heater is deactivated,whereby the combustion air fan V6 runs down toa standstill.

In case of a flameout during a normal combustionoperation and if the system does not detect any

malfunction, the flame automatically re-ignites.

Conditions for the activation:

• A properly charged vehicle battery (a minimumvoltage of 11.5 V is required for the faultless op-

eration of the electrical components of the AH.)• Suf ficient fuel (if too little fuel is present in the

fuel tank - the fuel gauge is in the red field, theauxiliary heater control unit J364 does not acti-vate the auxiliary heater.)

Control of the auxiliary heater

The auxiliary heater is designed to increase thetemperature of the coolant.

When the coolant temperature reaches 72°C,the auxiliary heater control unit J364 enables theauxiliary heater to switch to the energy savingpart load operation.

When the coolant temperature rises to 76.5°C,the auxiliary heater control unit J364 enables theauxiliary heater to enter a control idle period.

If the coolant temperature drops during the con-trol idle period to below 71°C within 900 seconds(15 mins), this causes the heating unit to performa full load operation.

Deactivation of the auxiliary heater

After switching off the auxiliary heater manu-ally or after a running time of 60 minutes as wellas after the coolant temperature has reached

85 °C, the combustion stops and the run-downcommences. The circulation pump V55 and thecombustion air fan V6 first continue operation tocool the auxiliary heater down (run-down) to beautomatically switched off afterwards.


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12 GB

Thermo Top V

SP79_19

SP79_20

Body of the combustion unit - description and positioning in the vehicle

inlet silencer

water pump

heat exchanger

Combustion air fan

cold water supply

outlet of heated water

exhaust gas silencer


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with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S.� 14 GB

Thermo Top V

Operation of the auxil iary heater

There are three ways of starting the Thermo Top V auxiliary heater:

• Programming the auxiliary heater with the data display protocol via the multi-function display.

• Starting the AH with the instant heat button on the dash panel of the heating and air conditioning

system.

• Using a separate remote control for the auxiliary heater.

Programming the auxil iary heater

The function of the auxiliary heater can be pro-grammed using the multi-function display.

In the menu Aux. heating the following basic setof entries are prepared:

• Weekday• Running time• Mode

Set the current weekday as well as the runningtime of the auxiliary heater in the range of 5–60minutes and set the heating or ventilation mode using the entry mode.

The weekday, hours and minute for the startingtime of the AH can be set in the menu Aux. heat-ing under the three pre-set times 1, 2 and 3.

SP79_17

The LED indicator light on the dash panel of the heating and air conditioning system notifies if the aux-

iliary heater is switched on or the activation period is programmed. The indicator light comes on whenthe auxiliary heater is switched on. If the activation period is programmed, the indicator light comes onfor about ten seconds after switching off the ignition.


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15GB

SP79_4

SP79_6

SP79_5Climatic

Climatronic

Direct activation of the auxiliary heater

The auxiliary heater can always be directly acti-vated or deactivated using the button on the dashpanel of the heating system (SP79_4), the Climatic(SP79_5) or Climatronic (SP79_6).


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16 GB

Thermo Top V

SP79_13

Remote control of the auxiliary heater

The Thermo Top V auxiliary heater with remotecontrol can only be ordered as part of the option-

al equipment for the model range Superb.

The receiver which receives the control signalsfrom the remote control is located inside thevehicle body above the wheel house of the rearleft wheel, it is connected to the auxiliary heatercontrol unit via a wiring harness, whereby theroof antenna is also connected to the receiver.

connection of the roof antenna

networking with the AH control unit

remote control receiving unit SP79_12

Positioning of the control unit for the remote control on theŠkodaSuperb


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17GB

SP79_1 SP79_2

5 3 m m

SP79_14

A transmitter with a battery is located in the plastic housing of the miniature remote control. Theremote control has an ON button for switching on, an OFF button for switching off and an LED signaldiode for monitoring its condition (lights up green for 2 s = AH was activated; lights up red for 2 s = AHwas deactivated). In addition, the diode indicates the battery charge level and the reception of thecontrol signal from the remote control.The remote control cannot be used inside the vehicle. If the AH should be switched on using theremote control, we must respect a minimum distance of two metres from the vehicle in which theauxiliary heating to be operated is installed. The range of the transmitter with a charged battery is upto 600 m.

LED indicator light

antenna

battery casing

Positioning of the control unit for the remote con-trol on the ŠkodaSuperb Combi


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18 GB

Thermo Top V

1

2

V2 J255 J533 J285

J364 R149

34

V54 V55 V6 N279 *** Z66

5 V2*N24*

J301*J65*

J13

G 18 G 189 Q 8

6

1 fuses

2 battery3 instant heat button with indicator light4 antenna5 special databus6 CAN databus - information systemV2 fresh air blowerJ255 Climatronic control unitJ533 data bus diagnostic interfaceJ285 control unit in dash panel insert with displayT16 diagnostic connectionG18 temperature sensor

Q8 glow plug with flame monitorJ364 auxiliary heater control unitR149 remote control receiverV54 fuel dosing pump

V55 circulation pump

V6 combustion air fanN279 shut-off valve for the coolant, heatingJ13 fresh air blower relayZ66 heating element for preheating the fuel (only

for diesel)J301 control unit of the air conditioning systemJ65 control unit of the heating systemN24 pre-resistor for fresh air blower with over-

heating limiter * only for the Climatic or heating system** only for vehicles with diesel engines

*** except T-FSI engines and diesel engineswith DFS

output signal input signal

databus positive pole earth (ground)

Wiring diagram

SP79_21


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20 GB

Thermo Top V

SP79_25

heating element Z66

fuel supply

Safety condit ions for the use of theauxiliary heater

• The auxiliary heater must not be used withina closed area! The AH produces combustiongases which could cause poisoning. Therefore,

the vehicle must not be within a closed area,such as in the garage, when activating the AH.

• When filling up with fuel, the auxiliary heatermust always be switched off, otherwise there isa risk of fire!

• When using the AH, you should not stand ona surface that could ignite easily from the hotexhaust gases of the auxiliary heater, for exam-ple, dry grass.

Preheating of the fuel

On diesel engines, the AH Thermo Top V versionis equipped with a heating element for preheat-

ing. The fuel is directly preheated by the heatingelement prior to injection into the combustionchamber, thus reducing the formation of smokewhen starting the heater. The heating elementis activated for approximately one minute afterstarting the AH.


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22 GB

Thermo Top C

Function of the system

SP79_26

coolant outlet

coolant inlet

combustionair inlet

Combustion air fan

glow plug

fuel supply

combustion air duct

exhaust pipe

flue

water jacket

combustion chamber

fuel evaporator


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23GB

The Thermo Top C auxiliary heater can be retro-fitted in the vehicle as part of the original acces-sories of Škoda Auto. Except for the use of thefuel evaporator, the heater unit is identical interms of operation with the Thermo Top V ver-sion, but differs in the design of the unit.

The combustion unit of the Thermo Top C auxil-iary heater is installed in front of the wheel houseof the front left wheel. In case the vehicle isequipped with a turbocharged engine, the com-pressed air cooling radiator is already fitted in thisspace, whereas the combustion unit is locatedon the right side of the vehicle. Always observethe notes of the assembly instruction which isincluded in the set of original accessories of theauxiliary heater.

control unit

Circulation pump

Combustion air fan

water jacket

burner housing

SP79_27


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24 GB

Thermo Top C

Circulation pump

If the engine is switched off, the coolant circulationis ensured by the circulation pump of the auxiliary

heater. It is directly activated by the AH control unit.

electromagnetic coil

fan wheel of the pump

iron core

permanent magnet

SP79_28


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26 GB

Thermo Top C

combustion chamber

The formation of the fuel-air mixture takes placein the combustion chamber. The following com-

bustion takes place in the flu.

The glow plug which extends into the combustionchamber ignites the fuel-air mixture in the activa-tion phase.Another function of the glow plug is to monitor thetemperature of the flame over the entire runningtime of the auxiliary heater.

flue

combustion air inlet

combustion air inlet in the fuelevaporator

glow plug

fuel supply

combustion chamber

coolant inlet

coolant outlet

exhaust pipe SP79_30

During the heating phase, the mixture is ig-nited from the already hot walls of the com-

bustion chamber.


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27GB

Exhaust system

The heating unit is fitted with a separate exhaustsystem, which consists of the exhaust pipe and the

silencer.

The exhaust system directs the resulting exhaustgases independently from the exhaust managementsystem of the vehicle.

The length of the exhaust system is well defined andcoordinated with the pulsating combustion withinthe heating unit. For safe operation, it is thereforerequired to adhere to the established length of theexhaust pipe.

silencer

exhaust pipe

SP79_31


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29GB

Notes


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30 GB

Notes


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31GB


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E

7 9

This paper was made out ofchlorine-free bleached cellulose.

Only for the internal use in the service network ŠKODA.

All rights and technical modifications reserved.

S00.2002.79.20 Technical status 12/2009© ŠKODA AUTO a s http://portal skoda auto com

51 2.0 ltr./85 kW petrol engine with balancing shaftsand two-stage intake manifold

52 ŠkodaFabia; 1.4 ltr. TDI engine with unit injection

system 53 ŠkodaOctavia; Presentation of the vehicle 54 ŠkodaOctavia; Electrical Components 55 FSI petrol engines; 2.0 ltr./110 kW and 1.6 ltr./85

kW 56 Automatic gearbox DSG-02E 57 Diesel engine; 2.0 ltr./103 kW TDI with pump-nozzle

units, 2.0 ltr./100 kW TDI with pump-nozzle units 58 ŠkodaOctavia, Chassis and electromechanical

power-assisted steering 59 ŠkodaOctavia RS, 2.0 ltr./147 kW FSI turbo engine 60 2.0 ltr./103 kW 2V TDI diesel engine; particle filter

with additive 61 Radio navigation systems in the Škoda 62 ŠkodaRoomster; Vehicle presentation part l63 ŠkodaRoomster; Vehicle presentation part ll

64 ŠkodaFabia II; Vehicle presentation part 65 ŠkodaSuperb II; Vehicle presentation part l 66 ŠkodaSuperb II; Vehicle presentation part ll 67 2.0 ltr./125 kW TDI diesel engine with Common Rail

injection system 68 1.4 ltr./92 kW TSI petrol engine with turbocharger 69 3.6 ltr./191 kW FSI petrol engine 70 All-wheel drive with Haldex coupling of the lV.

generation 71 ŠkodaYeti; Vehicle presentation part l 72 ŠkodaYeti; Vehicle presentation part ll

73 LPG system in Škoda vehicles 74 1.2 ltr./77 kW TSI petrol engine with turbocharger 75 Automatic 7-speed gearbox with double clutch 0AM 76 Greenline vehicles 77 Geometry 78 Passive safety 79 Additional heating

1 Mono-Motronic 2 Central locking 3 Vehicle alarm

4 Working with wiring diagrams 5 ŠKODA FELICIA 6 Safety of the ŠKODA vehicles 7 Principles of ABS - were not published 8 ABS - FELICIA 9 System for safe start-up with transponder 10 Air conditioning in the vehicle 11 Air conditioning FELICIA 12 1.6 engine - MPI 1AV 13 Four-cylinder diesel engine 14 Power-assisted steering 15 ŠKODA OCTAVIA 16 1.9 ltr. TDI diesel engine 17 ŠKODA OCTAVIA Convenience electronic system

18 ŠKODA OCTAVIA Manual gearbox 02K, 02J 19 1.6 ltr. and 1.8 ltr. petrol engines 20 Automatic gearbox - fundamentals 21 Automatic gearbox 01M 22 1.9 ltr./50 kW SDI diesel engines, 1.9 ltr./81 kW TDI 23 1.8 ltr./110 kW and 1.8 ltr./92 kW petrol engines 24 OCTAVIA, CAN BUS databus25 OCTAVIA - CLIMATRONIC

26 OCTAVIA - safety of the vehicle 27 OCTAVIA - 1.4 ltr./44 kW engine and gearbox 002 28 OCTAVIA - ESP - fundamentals, design, function 29 OCTAVIA 4 x 4 - all-wheel drive 30 2.0 ltr. 85 kW and 88 kW petrol engines

31 Radio navigation system - design and functions 32 ŠKODA FABIA - technical information 33 ŠKODA FABIA - electrical systems 34 ŠKODA FABIA - electro-hydraulic power-assisted

steering 35 1.4 ltr. - 16 V 55/74 kW petrol engines 36 ŠKODA FABIA - 1.9 ltr. TDI Unit injection 37 Manual gearbox 02T and 002 38 ŠkodaOctavia; model 2001 39 Euro-On-Board-Diagnosis 40 Automatic gearbox 001 41 Six-speed gearbox 02M 42 ŠkodaFabia - ESP 43 Exhaust emissions

44 Extended service intervals 45 Three-cylinder petrol engines 1.2 ltr. 46 ŠkodaSuperb; Presentation of the vehicle; part I 47 ŠkodaSuperb; Presentation of the vehicle; part Il 48 ŠkodaSuperb; 2.8 ltr./142 kW V6 petrol engine 49 ŠkodaSuperb; 2.5 ltr./114 kW TDI V6 petrol engine 50 ŠkodaSuperb; Automatic gearbox 01V

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ssp 79 auxiliary heater

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