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Thermo 90 S / Thermo 90 ST Table of contents

III

9Repair

9.1 General.................................................................................................................................................. 901

9.1.1 Work on stripped-down components........................................................................................... 901

9.2 Dismantling and assembling.................................................................................................................. 902

9.2.1 Electrical connections (Thermo 90 S).......................................................................................... 902

9.2.2 Changing the circulating pump.................................................................................................... 903

9.2.3 Changing the temperature limiter ................................................................................................ 904

9.2.4 Changing the temperature sensor............................................................................................... 904

9.2.5 Changing the combustion air fan................................................................................................. 906

9.2.6 Changing the burner, flame monitor and glow plug..................................................................... 907

9.2.7 Changing the burner head........................................................................................................... 909

9.2.8 Changing the heat exchanger ..................................................................................................... 910

10 Packing, storage and shipment

10.1 General................................................................................................................................................ 1001