Webasto Thermo 90 ST Workshop Manual

Thermo 90 S / Thermo 90 ST Table of contents
I
Table of contents
1 Introduction
1.1 Contents and purpose ........................................................................................................................... 101
1.2 Meaning of signal words........................................................................................................................ 101
1.3 Additional documentation to be used..................................................................................................... 101
1.4 Safety instructions and regulations........................................................................................................ 101
1.4.1 General safety regulations........................................................................................................... 101
1.5 Statutory regulations governing installation............................................................................................102
2 General description
2.1 Combustion air fan................................................................................................................................. 202
2.2 Heat exchanger ..................................................................................................................................... 202
2.3 Temperature sensor .............................................................................................................................. 203
2.4 Temperature limiter................................................................................................................................ 203
2.5 Burner insert .......................................................................................................................................... 203
2.6 Glow plug............................................................................................................................................... 203
2.7 Flame monitor........................................................................................................................................ 203
2.8 Combustion pipe.................................................................................................................................... 203
2.9 Circulating pump.................................................................................................................................... 203
2.10 Control unit ............................................................................................................................................ 203
2.11 Metering pump....................................................................................................................................... 203
3 Function description
3.1 Switching on .......................................................................................................................................... 301
3.2 Heating mode ........................................................................................................................................ 301
3.3 Control mode ......................................................................................................................................... 301
3.4 Switching off .......................................................................................................................................... 302
3.5 Heater functions when installed in ADR vehicles .................................................................................. 302
3.6 Malfunctions........................................................................................................................................... 303
3.6.1 Fault lock-out............................................................................................................................... 303
3.6.2 Diagnosis after fault lock-out, Thermo 90 S and Thermo 90 ST ................................................. 304
4 Technical data................................................................................................................................................ 401
5 Troubleshooting
5.1 General.................................................................................................................................................. 501
5.2 General fault indications ........................................................................................................................ 501
5.3 Fault indications on fault lock-out .......................................................................................................... 502
5.4 Visual check for assessing the burner................................................................................................... 503
5.4.1 Burner housing .............................................................................................................................503
5.4.2 Back wall with metal evaporator.................................................................................................. 504
5.4.3 Combustion chamber .................................................................................................................. 504
5.4.4 Complete burner.......................................................................................................................... 504

Webasto Thermo 90 ST Specifications

General

Heating Capacity	9 kW
Weight	4.8 kg
Dimensions	254 x 100 x 177 mm
Fuel	Diesel
Nominal Voltage	12V or 24V
Heating Power	9 kW
Voltage	12V or 24V