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Benekov S51 Manual

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8. Boiler maintenance
NOTE: Before performing maintenance and cleaning the boiler and/or feeder mechanism, it is
necessary to make sure the boiler is disconnected from the power supply (plug pulled out of the
socket). Risk of injury!
1.) It is necessary to ensure timely refuelling. If a small amount of fuel remains in the container, it must be
refilled immediately to prevent extraction of "false air" and a smoked container.
2.) If the boiler is correctly adjusted, the ash has the form of a fine grey powder, which accumulates in the
ash tray drawer. The combustion compartment has self-cleaning design and in the course of normal
operation the boiler’s ash tray drawer has to be emptied once or twice a week. It is necessary to use
protective gloves for this activity.
3.) In continuous operation of the boiler it is recommended to clean the heat transfer area of the combustion
chamber or the exchanger fins once a week. The heat transfer surfaces can be subject to clogging,
which can greatly affect the heat transfer and thus the efficiency of the boiler. Occasional cleaning of the
inside of the grate (on a monthly basis) should not be forgotten. Its clogging impairs the flow of
combustion air to the burner nozzles. The boiler must be shut-off by the main switch at least 1 hour
before cleaning the grate. After the heating season the entire boiler must be carefully and completely
cleaned.
4.) The minerals contained in the fuel can form hard deposits during operation in the area of the burner. This
can subsequently cause a complete blockage of the screw shaft of the feeding mechanism. To avoid the
risk of this phenomenon, it is recommended to check the burner zone at least monthly and in the event
of hard deposits, mechanically remove any stuck material.
5.) It is further recommended to perform occasional external cleaning of drives and fans. Cleaning must be
done using a dry brush. The boiler must be disconnected from the power supply during this time.
6.) A refractory ceramic reflector is located above the boiler burner. It does not require any special attention.
Any fly ash deposited on the surface of the reflector can be regularly removed, but it does not affect its
function.
7.) For a reliable operation of the turnstile during fuel feeding into the screw feeder, it is necessary to
maintain proper tension of the chain, i.e. the deflection in the middle between the sprockets must be in
the range of 6 to 10 mm. If the deflection is bigger, the chain must be replaced. When checking the
tension and handling of the chain the boiler must be shut down. Risk of hand injury!
8.) In case of a screw fuel feeder blockage the two motors are protected against damage by the thermal
contact (working temperature of the fuel feeder motor is up to 85 °C), which after exceeding the
critical temperature shuts down both feeder motors and the fan(s). If this happens, the boiler must be
shut down and repaired.
9.) Since pressurising occurs in the burner area during fan operation, it is necessary to ensure perfect
tightness of the boiler (boiler door, the top cover of the boiler body, etc.).
10.) Occasionally perform a visual check of the emergency fire-fighting equipment.
11.) In the event of an emergency (electricity outage for long periods, etc.) or if fuel burns through the
increase in temperature opens the thermostatic valve and any fuel is extinguished with water from the
water main. Before restarting the boiler it is necessary to remove wet fuel, and fire the boiler in a
standard manner (see chap. 7.1.).
12.) The gearboxes are filled with synthetic oil in compliance with factory standards therefore no further
maintenance is required.
… 34 …


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