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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
8. 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.
8.1. 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.
8.2. 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.)
8.3. Active anode
The internal surface of the tank covered by enamel made of steel sheet, which represents complementary
protection against corrosion, is supported by active anode. The life-cycle of the active anode depends on the
quality and temperature of the water. In case of water of lower temperature, the extent of active anode
diminution is less.
Your appliance is equipped with the up-to-date active anode status display. Until when the signal lamp
of the hot water tank lights with green color, the active anode ensures secondary corrosion protection of the
tank. As soon as the active anode fails to perform its corrosion protection task, the color of the signal lamp turns
into yellow color, then into red color. In this case, a professional electrician has to be contacted to mount a new
active anode into the appliance. It is extremely important to mount the electronics of the active anode display
and the signaling anode in a professional way.
IN CASE OF NEGLECTING THE ABOVE INSTRUCTIONS THAT CAUSES DAMAGE TO
SAFETY AND USAGE FEATURES OF THE APPLIANCE, YOU LOSE YOUR GUARANTEE AND
WARRANT RIGHTS.
8.4. Scale removal
Depending on the quality of the water, scale deposition may occur on the heater exchanger or on the
tank. The scale deposited on the heater decreases heating efficiency. So, it is necessary to clean the hot water
tank from scale every second year.
It is strictly forbidden to apply any sharp metal object or acid to remove scale deposited on the heat
exchanger, the close cover and its fittings. Please use cleaning and scale removal supplies available in
commerce.
37


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