-
15
-
Drainage of service water shall be performed after closing the shut
-
off valve in the cold water
supply piping (through the discharge
valve for a combination of safety valves) and with
simultaneous opening of all hot water valves of connected fittings (water can be also drained
through the safety valve.
Hot water may outflow during the drainage!
If there is a risk of frost,
be aware that not only the water in the hot water tank and the water in the hot water piping
may freeze, 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 positively
sure that the
water flowing out of the hot water valves does not contain any bubbles
.
2.8
INSPECTION, MAINTENANCE & CARE FOR THE A
PPLIANCE
During the heating process the water that increases its volume during the heating must visibly
drip off the safety valve drain. In full heating (about 75°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 If hot water heater is not in operation, or hot water is not going to be withdrawn,
no water may 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!
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. 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. Cleaning takes place through
the hole in the flange
-
dismantle the flange lid and cleaning the heater. 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 decalcification pump. Remove
the calcerous buildup with timber or plastic tool, and hoover or wipe it with a cloth.
Then the appliance must be thoroughly flushed and the heating process checked as on the first
putting in operation. Do not use any aggressive cleaning agents (such as liquid sand, chemicals
-
acid, alkaline) or thinners to clean the outer shell of the heater. For cleaning use a wet cloth
and add a few drops of liquid cleaning agent for household applications.
