-
12
-
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 purposeful
to discharge all fixtures and pipes where water flows all the way to the section of the house
water meter (connection of the house to the water main) that is no longer threatened by frost.
When the heater 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 contains no 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. At full heating (about 74
℃
) the volumetric water gain is approx.
3.5% of the heater’s capacity. The function of the safety valve has to be checked regularly.
I
f 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!
The inlet cold water pipe and the connection fitting of the heater may heat up!
If the hot water heater does not work, or if hot water is not withdrawn, no water shall drip off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 bar, a pressure control valve has to be fitted), or the safety valve in the inlet
piping is malfunction. Please call a specialised plumber immediately!
Repetitive water heating causes lime scale sediment on
both the tank
walls and mainly
on the heating body. Lime scale settling depends on hardness of heated water, its temperature
and on the volume of hot water used. If water contains a lot of minerals, after one to two years
of operation an expert must be called to remove
scale forming inside the heater and the loose
sediments. Cleaning takes place through the hole in the flange
-
dismantle the heating element
and clean 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 a timber or plastic tool
and hoover it up or wipe off 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 abrasive
cleaning agents (such as liquid sand, chemicals
-
acid, alkaline) or paint thinners (such
as cellulose thinner, trichlor, and the like) to clean the outer shell of the heater. For cleaning
of the outer shell of the heater use a wet cloth and add a few drops of liquid detergent
commonly used in households.
