Operation Manual

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
Besides enamel coverage, the hot water tank is protected by anode against corrosion, so it is essential
that the tank always possesses an active anode of adequate size. Therefore the state of the active anode must be
checked every second year by a contracted service shop. This is also a condition for extra warranty related to
the tank (see the commercial warranty). If the diameter of the anode shrinks to appr. 10 mm, it has to be
replaced.
It is extremely important that the active anode has good contact with the tank. Therefore, in case of
mounting a new anode or performing any other repair work, the connection of the active anode and the earthing
screw has to be performed in a way that the electric connection must drive electricity well.
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.
Scale can be removed from the interior part of the tank manually, through the fitting opening. It is
rationale to flush the tank with water ray after scale removal.
8.5. Prevention of frost damages
If temperature may fall below the freezing point in the location of the hot water tank, the heating of the
tank must not be switched off or the tank must be discharged in periods of frost danger.
8.6. In case of indirect heating
OVERHEATING PROTECTION MUST BE PERFORMED BY THE INDIRECT HEATING
EQUIPMENT!
EN 36