hajdu HB200C Handbuch Über Inbetriebnahme, Bedienung Und Wartung Seite 86

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Perform an eye check to decide whether connections of edges and pipe fittings
are leaking or not – and tighten them carefully, if necessary. The appliance can be
connected to the electric power system only after this check. In order to switch the heat
pump of the water heater in a mode, press the ON/OFF key located on the control
panel. Before setting the clock and other parameters or programs, please follow the
instructions of chapter 4.
FOR PERSONNEL AUTHORIZED TO PERFORM MAINTENANCE
10. MAINTENANCE INSTRUCTIONS
WARNING!
Please follow the general warnings and safety precautions listed in the
previous chapter and please comply with them strictly.
Any operations and activities has to be performed by qualified personnel (so
they have to possess expertise as required by effective regulations).
WARNING!
Before repair or maintenance, the appliance always must be switched off and
the external switch must be turned into "OFF" position.
10.1. Appliance discharge
Water drainage can be performed through the blow off button (faucet) mounted in front
of the hot water tank or through the combined safety valve, turning the button in the
direction indicated by the arrow, through the water outlet tube. Before water drainage,
the valve closing pipeline connection and the cold water faucet have to be closed, while
the hot water faucet has to be kept opened during water drainage.
ATTENTION! HOT WATER MAY OUTFLOW DURING WATER DRAINAGE!
If you perceive water leaking or any malfunctioning from the interior of the appliance,
switch it off from the water pipeline system immediately with the help of the closing
valve.
10.2. Storing and combined safety valve
In order to ensure safe operation, it is rational to turn to a plumber to check the
appliance and the correct operation of the combined safety valve every now and then
(in every year). Furthermore, it is recommended to blow off the valve every month or
every second month through turning the blow off button of the safety valve in the
direction indicated by the arrow. This way, the valve seat is cleaned from any possible
pollution (sand grains, scale, etc.)
10.3. Active anode
As a supplementary accessory, the hot water tank is equipped with an active
anode to protect it against corrosion. The life expectancy of the active anode depends
on the conditions of water and operation. The state of the anode has to be checked
during periodic maintenance measures targeting scale removal or at least in every
second year.
The date of repeated check is defined by the repair technician. If the diameter
of the anode shrinks to 10 mm at any points, it has to be replaced.
The replacement of the active anode can only be performed by a contracted
service shop (see the commercial warranty!).