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Drainage of service water shall be performed after closing the shut-off valve in the cold water
supply piping (through the discharge valve for safety valve combination), and with simultaneous
opening of all hot water valves of connected fittings. Hot water may outflow during
the drainage! If there is a risk of frost it has to be considered that not only the water in the hot
water heater and in the hot water piping may get frozen but also the water in the entire cold
water supply piping. It is therefore advisable to drain all fittings and piping that carry water, up
to the part where the house water meter is installed (connection of the house to water main)
which is not jeopardized by frost. When the tank is to be used again, it has to be filled with water
and one needs to make sure that the water flowing out at the hot water valves did not contain
any bubbles.
2.7
INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE
During the heating process the water that increases its volume during the heating must drip off
the safety valve outlet (in non-pressurized connection this water drips off the combination
faucet valve). In full heating (about 75 °C) the volumetric water gain is approx. 3% of the tank
capacity. The function of the safety valve has to be checked regularly (based on the information
contained in the attached safety valve manual). In common operation, such a check needs to be
implemented at least once a month, and after each heater shutdown that exceeds 5 days.
Attention! In doing so, the cold water supply pipe and the connection fitting of the tank may get
heated! If the hot water heater does not work, or if hot water is not withdrawn, no water shall
drip off the safety valve. If water drips, then the pressure in the supply piping is either too high,
or the safety valve is defective. Please call a specialized plumber immediately!
Repetitive water heating causes limestone sediment on both the enameled tank walls
and chiefly the flange lid. The sedimentation depends on the hardness of water heated,
its temperature, and amount of hot water consumed. We recommend checking and cleaning
the tank from scale and eventual replacement of the anode rod after two years of operation.
The anode life is theoretically calculated for two years of operation; however, it changes with
water hardness and chemical composition in the place of use. Based on such an inspection,
the next term of anode rod exchange may be determined. Have the company in charge of service
affairs clean and exchange the anode. When draining water from the heater, the combination
faucet valve for hot water must be open, preventing occurrence of under-pressure in the heater
tank which would stop the water from draining.
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