Drazice OKHE ONE 120 Instrukcja obsługi i instalacji - Strona 14
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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 If the hot water heater does not work, or if hot water is not withdrawn, no water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!
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.
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.
If the anode is only blocked with sediments clean its surface and, if used up, mount a new one.
Have a company in charge of service affairs deal with the cleaning and exchanging of 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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