hajdu STXL300 Series Instructions For Installation And Use Manual page 31

In the case of any diffi culty (especially failure), the thermostat should be simply replaced.
The hot water tank
should be handled with care.
For appliances of type STXL300CE, proper operation is ensured by temperature control and
limiter unit installed in a common housing and factory preset to a control temperature of
65 ºC. The control temperature may be changed using the setting screw. This setting screw
becomes accessible after dismounting the electrical safety cover. THE SETTINGS
MUST BE CHANGED BY A PROFESSIONAL Upon failure of the regulator, the limiter protects
the hot water tank from harmful overheating by turning off the heating when the water
temperature reaches 95 °C. The limiter MUST BE RESET BY A PROFESSIONAL after resolving
the cause of the overheating.
8.5. Heater (for STXL300CE type)
In case of failure, the replacement of the radiator requires disconnection from the
electrical network and the discharge of water, as well as the removal of the bolts in the
service cover. THE REPAIR MUST BE PERFORMED BY A PROFESSIONAL.
8.6 Active anode
The hot water storage tank is additionally protected against corrosion by active anodes.
The service life of the active anodes is subject to the water quality and the operating
conditions. The condition of the anodes must be checked upon each descaling operation,
but at least once every two years. For STXL300CE type its replacement requires the
disconnection of the power supply; such replacement requires the disconnection of the
electrical circuit and the removal of the service cover. After removing the service cover, it
is recommended to perform reassembling using a new sealing. The technician determines
the time of the next inspection. If the diameter of the anode decreases by 10mm
anywhere, it must be replaced. After replacement of the anode, its earthing must be
implemented according to the original state. Adequate metal-through connection between
the active anode and the earthing bolt is essential.
8.7. Defrosting
Taking the appliance out of service requires the removal of power, and the total emptying
of the tank.
When putting back into operation, refill the appliance with water, before connecting to
the electrical network (for STXL300CE type)!
8.8. Summary of periodical inspections
Check of safety valve
Bimonthly
Descaling
Active anode inspection
Check of hydraulic connections
Check of the condition of electrical assemblies
Biennially
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