43
11 MAINTENANCE
Maintenance must be carried out by qualified personnel.
Some maintenance operations may be carried out when the machine is working and
therefore all the necessary safety precautions should be taken.
With the exception of specific cases maintenance operations must be carried out in the
following conditions:
• machine switched off
• chamber temperature the same as ambient temperature
• machine disconnected from the mains supply
• supply valves or taps above the machine closed.
MACHINE PART
HOW TO OPERATE
HOW OFTEN
Cleaning of external painted
and plastic surfaces
Cleaning of stainless steel
surfaces
Cleaning of the keyboard or
polycarbonate surfaces
• Do not use alcohol or solvents. The painted
surfaces could be dulled.
Household products to clean metal furniture may
be used. Before using a product, we advise trying
it on a small surface area out of sight.
Do not pour water or any other product that
could penetrate the joints between the plates
or inside the electrical equipment.
• Use specific products on the market.
Do not pour water or any other product that
could penetrate the joints between the plates
or inside the electrical equipment.
• Use a slightly damp cloth and then dry the surfaces
immediately.
• Once a week or whenever the sur-
faces are obviously dirty.
• Once a week or whenever the sur-
faces are obviously dirty.
• Once a week.
Air condenser
CHALLENGE SERIES
• Open the rear door and remove plate L (air con-
veyor) to gain direct access to condenser C.
• Do not aim direct jets of air at the condenser!
• Use either an industrial or a household vacuum
cleaner to remove any dust.
• To make this operation easier, use the brushes
supplied with the vacuum cleaner.
CH0305-F34
C
Electric cables
• Check the condition of the electrical supply cables.
• Once a week.
External connection pipes
• Check the condition of the connection pipes.
• Once a week.
Gaskets
• Check the condition of the gaskets.
If necessary, clean the gaskets with a neutral, liquid
detergent. Rinse with a damp cloth.
• Once a week.
• Once a week.
L
CH0305-F47
• Take care not to
bend the blades of
the condenser.
• Mount again the
plate L before to
clore the rear door.
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