Spheros GBW 300, Workshop Manual

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Table of contents NGW 300 / LGW 300 / GBW 300
II
5 Troubleshooting and elimination of faults
5.1 General information ................................................................................................501
5.2 General fault symptoms ..........................................................................................501
6 Functional tests
6.1 General information ...............................................................................................601
6.2 Combustion test ......................................................................................................601
6.2.1
Test of the CO
2
content ............................................................................601
6.3 Tests of individual parts ..........................................................................................602
6.3.1
Test of the regulating thermostat .............................................................602
6.3.2 Test of the temperature limiter .................................................................602
6.3.3 Test of the ignition electrodes ..................................................................602
6.3.4 Test of the flame monitor electrode .........................................................602
6.3.5 Test of the ignition spark generator .........................................................603
6.3.6 Test of the burner motor ..........................................................................603
6.3.7 Test of the vacuum switch .......................................................................603
6.3.8 Test of the gas pressure regulator ...........................................................603
6.3.9 Test of the delayed-action solenoid in the gas intake pipe ......................604
7 Wiring diagrams
7.1 General information ................................................................................................701
8 Service work
8.1 General information ...............................................................................................801
8.2 Work on the heater .................................................................................................801
8.3 Work on the vehicle ................................................................................................801
8.4 Trial run of the heater ............................................................................................801
8.5 Maintenance work .................................................................................................801
8.5.1
Disassembly and mounting of the burner head ........................................802
8.6 Visual inspections and installation regulations ......................................................802
8.6.1
Connection to the vehicle’s cooling system ..............................................802
8.6.2 Connection to the vehicle’s gas system ....................................................803
8.6.3 Combustion air supply .............................................................................803
8.6.4 Exhaust pipe .............................................................................................803
8.7 Disassembly and installation .................................................................................805
8.7.1
Heater: disassembly and installation ....................................................... 805
8.7.2 Replacing the temperature limiter .............................................................805
8.7.3 Replacing the regulating thermostat ........................................................805
8.7.4 Replacing the SG 1585 control unit ..........................................................805
8.7.5 Gas pressure regulator: Dismantling and installation ...............................805
8.8 Start-up ...................................................................................................................806
8.8.1 Ventilation of the coolant circuit ................................................................806