46
HPT 300 • HPT 300C
FOR PERSONNEL AUTHORIZED TO PERFORM MAINTENANCE
9. MAINTENANCE INSTRUCTIONS
WARNING
Always observe and strictly comply with the general warnings and safety instruc-
tions laid down under previous Clauses.
All maintenance operations and activities must be performed by qualified personnel
(i.e. the persons concerned must have the expertise as required by the effective regu
-
lations).
If the mains cable is damaged, it must be replaced in order to avoid any danger. Such
replacement must be performed by the manufacturer, its service support or a similarly
qualified professional.
WARNING
Before repair or maintenance, the appliance must be switched off and the external
switch must be turned into “OFF” position in all cases.
9.1. Emptying the appliance
You can empty the container by using the discharge valve (faucet) mounted in front of
the hot water tank or the combined safety valve (by turning the knob in the direction in-
dicated by the arrow).
Before emptying, close the closing valve of the water supply network and the cold water
tap of the faucets, while opening the hot water tap of one of the faucets, and keeping it
open during emptying process.
ATTENTION! HOT WATER MAY LEAVE THE APPLIANCE
DURING WATER DRAINAGE!
If you discover leakage from the interior of the container or any other sign of irregular
operation, promptly disconnect the appliance from the water supply network using the
closing valve.
9.2. The container and combined safety valve
To ensure safe operation it is recommended to regularly (every year) have the ap-
pliance and the combined safety valve checked by a plumber for proper operation.
Additionally, it is also recommended to blow off the valve every two months by turning
the blow-off button of the safety valve in the direction indicated by the arrow. This way,
the valve seat will be cleaned of any possible deposit (scale, sand grains etc.).
9.3. Active anode
The inner surface of the enamelled steel tank is protected against corrosion by an ac-
tive anode serving as a supplementary protection. The service life of the active anode
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