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2.7 PUTTING OUT OF SERVICE, DISCHARGE
If the hot water heater is put out of service for a longer time, or if it is not going to be used
it has to be drained and disconnected from the electric supply network on all poles. The switch
for the supply lead or the fuse cut-outs have to be shut off.
At places with permanent risk of frost the hot water heater must be drained before the cold
season starts if the appliance remains out of service for several days and if the power supply
is disconnected.
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 (water can be also drained through safety
valve; for that purpose, the safety valve is turned to the "Check" position). 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 jeopardised 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.
2.8 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE
During the heating process the water that increases its volume during the heating must visibly
drip off the safety valve outlet (in non-pressurised connection this water drips off
the combination faucet valve). In full heating (about 74°C) the volumetric water gain is approx.
3.5 % of the tank capacity. The function of the safety valve has to be checked regularly.
If the safety valve control knob is lifted or turned to the "Control" position, the water must flow
out easily, without any obstacles, from the safety valve element to the outfall line. In common
operation, such a check needs to be implemented at least once a month, and after each heater
shutdown for more than 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 If the hot water heater does not work, or if hot water is not withdrawn, no water shall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 water pressure in the supply piping is either too
high (if higher than 5.5 bars, a pressure control valve has to be fitted), or the safety valve
is defective. Please call a specialised plumber immediately!
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