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List of Contents BBW46/DBW46 List of Contents 1. Introduction 1.1 Scope and Purpose . 101 1.2 Meaning of Warnings, Cautions, and Notes 101 1.3 Additional Documentation to be used . 101 1.4 Safety Information and Regulations . 101 1.4.1 General Safety Notes 101 1.5 Legal Provisions for Installation . 102 1.6 Corrections and Improvements .. 103 2. General Description 2.1 Combustion Air Fan with Intake Muffler . 202 2.2 Heat Exchanger . 202 2.3 Burner Head with Combustion Pipe . 202 2.4 Circulation Pump 202 2.5 Flame Sensor .. 203 2.6 Glow Plug .. 203 2.7 Temperature Sensor 203 2.8 Temperature Limiter . 203 2.9 Temperature Fuse 203 3. Functional Description 3.1 Sequence of Operation .. 301 3.1.1 Switch On 301 3.1.2 Combustion Operation .. 301 3.1.3 Switch Off 302 3.1.4 Error Lockout . 302 4. Technical Data 401 5. Troubleshooting 5.1 General .. 501 5.2 General Fault Symptoms .. 501 6. Functional Checkouts 6.1 General .. 601 6.2 Adjustments . 601 6.2.1 Adjustment of CO Contents . 601 2 6.3 Components Testing 601 6.3.1 Temperature Sensor Resistance Check .. 601 6.3.2 Flame Sensor Check . 601 7. Circuit Diagrams 7.1 General .. 701 I BBW46/DBW46 List of Contents 8. Servicing 8.1 General 801 8.2 Work on the Heater 801 8.3 Work on the Vehicle ..801 8.4 Heater Test Run .801 8.5 Servicing .801 8.6 Visual Inspections and Installation Regulations ..802 8.6.1 Connection to the Vehicle Cooling System .802 8.6.2 Connection to Vehicle Fuel System .805 8.6.3 Dosing Pump ..807 8.6.4 Fuel filter 807 8.6.5 Combustion Air Supply ..807 8.6.6 Exhaust Line 807 8.7 Removal and Installation 808 8.7.1 Removal and Installation of Heater .808 8.7.2 Replacement of Circulation Pump 808 8.7.3 Replacement of Temperature Limiter or Temperature Fuse ..809 8.7.4 Replacement of Temperature Sensor 809 8.7.5 Replacement of Combustion Air Fan ..809 8.7.6 Replacement of Flame Sensor ..809