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00RNO0333-B (U0625869)
EVO S -
Installation and Servicing
7. MAINTENANCE OPERATIONS
These operations must be carried out by a qualified professional.
Before performing the following operations:
•
Switch off the main circuit breaker.
• Close the gas supply isolation valve.
• Isolate the boiler hydraulically.
Clean the exchanger (see details in the next chapter)
Check tube sooting visually.
If necessary, clean the tubes with a
non-metal brush. Chemical cleaning is forbidden
.
Ignition / ionisation electrodes (see details in the next chapter)
Check the geometry of the ignition electrode (gap width) and the ionising electrode.
If necessary, replace the electrodes.
Condensate removal siphon
Clean the removal siphon and check that the condensates flow correctly (replace the water after
checking).
Check the gas valve and the differential air pressure switch. Check the connection of the pressure
transfer pipe.
Carry out a combustion hygiene check.
7.1. Draining the boiler
• Hydraulically isolate the boiler (for installations with our cascade packs, the
shut-off valves are on the collectors),
• Reduce the pressure by opening the boiler bleed valve,
• Open the drain valve of the installation or the valve supplied with our
hydraulic packs,
• Complete the draining of the outlet pipe by actuating the safety valve.
