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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.
Caution! 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 If the hot water heater does not work, or if hot water is not withdrawn,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!
If water contains too many minerals, an expert has to come to remove the scale that forms
inside the tank, as well as free sediments. This has to be performed after one or two years
of operation. The cleaning is carried out through the hole in the flange – dismantle the flange
lid and clean the tank. A new sealing has to be used for re-fitting. Since the inside of the heater
has special enamel, which must not get in contact with the scale removing agent – do not work
with a lime pump.
Remove the lime layer with a timber and suck it off, or wipe it off with
a clout. After that, the appliance must be rinsed thoroughly and the heating process is checked
the same as during the initial putting in operation. Do not use any abrasive cleaning agents
(such as liquid sand, chemicals - acid, alkaline) or dye thinners (such as cellulose thinner,
trichlor, and the like) to clean the outer shell of the heater. For cleaning use a wet clout and
add a few drops of liquid cleaning agent for household applications. Repeated heating causes
lime scale settling on the receptacle walls and mostly on the lid of the flange. Lime scale
settling depends on hardness of heated water, its temperature and on the volume of hot water
used.
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