Spheros thermo 231, Workshop Manual

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9 Repair Thermo 230 / 231 / 300 / 301 / 350
902
9.1.1 Work on Components after Disassembly
CAUTION
All gaskets located between disassembled components
must always be replaced and discarded.
9.1.1.1 Visual Inspection, General
• Examine all components for damages (cracks,
deformation, wear, etc.) and replace as necessary.
• Examine connectors and wiring for corrosion, loose
contacts, wrong crimping, etc. and repair as
necessary.
• Check terminals for corrosion and contacts for
security. Repair as required.
9.1.1.2 Combustion Chamber, Visual Inspection
– Check swirl ring for security.
– Inspect combustion chamber for oxidizing and coke
deposits and remove as required.
– Check welding seem for cracks.
NOTE
Longitudinal cracks up to 80 mm are allowed.
9.1.1.3 Heat Exchanger, Visual Inspection
– Inspect exhaust ducting in heat exchanger for sooting,
deposits, damage and corrosion.
NOTE
Deposits are to be removed with water jet and brush.
– Inspect heat exchanger for exterior damage, defor-
mation, etc.
NOTE
Heavy deformation may cause restricted flow of coolant.
CAUTION
When replacing the combustion chamber on
heaters installed vertically, remove deposits in heat
exchanger using a suitable tool.
9.1.1.4 Combustion Air Fan Wheel, Visual Inspection
– Check fan wheel for contamination and cracks.
– Check cover plate for security.
– Check slide lock for proper sealing.
9.1.2 Incorporation of Modifications
NOTE
Continuous enhancement of heater design is for optimi-
zing performance and avoiding failures and malfunctions.
Normally equipment in use may be retrofitted using
available modification kits
The following modifications may be incorporated during
repair procedures:
• installation of control unit 1572D as substitute for
control unit 1572 (see 9.1.2.1)