hajdu ZA15 Montage- Und Gebrauchsanleitung Seite 22

If the hot water need can be met using water of this
temperature, taking into account the volume of the
given tank, it is advised to operate the tank at 40°C.
The start of the three lines means 60°C and the end
means 80°C. When more water is needed, operate the
hot water tank at 60°C, and do not set the
temperature regulator to 80°C, unless it is absolutely
necessary.
There is significantly less scale deposit or corrosion,
when the temperature is set to either 40°C or 60°C. Control knob
3. Temperature limiter
In case of temperature regulator failure or improper operation, it interrupts the
heating circuit before the water temperature exceeds 100°C.
The appliance must be reset by a technician after resolving the failure.
THE REPAIR MUST BE CARRIED OUT BY A PROFESSIONAL!
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 anode should be checked, when maintenance is
carried out at the descaling intervals, but at least once in every two years. The
technician determines the time of the next inspection. If the diameter of the anode
decreases to app. 10 mm, it must be replaced.
IF YOU FAIL TO OBSERVE THE FOREGOING, AND THIS RESULTS IN THE
DETERIORATION OF THE SAFETY AND OPERATIONAL CHARACTERISTICS OF THE
APPLIANCE, YOU WILL LOSE YOUR GUARANTEE AND WARRANTY RIGHTS.
Descaling
Depending on the quality of water, scale may deposit on the radiator and the tank.
The scale deposited increases the likelihood of radiator failure, whereby descaling is
necessary every 2.5 to 3 years. Since electrical assemblies are disconnected during
descaling, the temperature regulator, temperature limiter, radiator and electrical
connections should also be checked at the same time.
THESE CHECKS MUST BE CARRIED OUT BY A SPECIALISED SERVICE COMPANY!
Disassemble the appliance only when disconnected from the mains and drained.
When cleaning, avoid damaging the protective surface finish.
Draining
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