Table of contents Thermo 90 S / Thermo 90 ST
II
6 Function tests
6.1 General................................................................................................................................................. 601
6.2 Settings................................................................................................................................................. 601
6.2.1 Setting the CO
2
content.............................................................................................................. 601
6.3 Testing individual components.............................................................................................................. 601
6.3.1 Resistance test of the temperature sensor................................................................................. 601
6.3.2 Resistance test of the glow plug................................................................................................. 601
6.3.3 Resistance test of the flame monitor .......................................................................................... 601
6.3.4 Testing the combustion air fan.................................................................................................... 601
7 Circuit diagrams
7.1 General................................................................................................................................................. 701
8 Service work
8.1 General................................................................................................................................................. 801
8.2 Work on the heater ............................................................................................................................... 801
8.3 Work on the vehicle .............................................................................................................................. 801
8.4 Heater trial run ...................................................................................................................................... 802
8.5 Service work ......................................................................................................................................... 802
8.6 Visual inspections and installation instructions..................................................................................... 804
8.6.1 Connection to the vehicle cooling system................................................................................... 804
8.6.2 Connection to the vehicle fuel system ........................................................................................ 804
8.6.3 Metering pump with damper....................................................................................................... 807
8.6.4 Fuel filter..................................................................................................................................... 807
8.6.5 Combustion air supply................................................................................................................ 807
8.6.6 Exhaust line................................................................................................................................ 808
8.7 Removal and installation....................................................................................................................... 808
8.7.1 Heater, removal and installation ................................................................................................. 808
8.7.2 Changing the circulating pump ................................................................................................... 809
8.7.3 Changing the temperature limiter ............................................................................................... 809
8.7.4 Changing the temperature sensor.............................................................................................. 809
8.7.5 Changing the combustion air fan................................................................................................ 809
8.8 Start-up................................................................................................................................................. 809
