8
Warning!
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If the hot water heater does not work, or if hot water is not withdrawn, no water shall drip off the safety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 or dye thinners to clean the outer shell of the heater (such as cellulose thinner, trichlor, and the like).
For cleaning use a wet clout and add a few drops of liquid cleaning agent for households applications.
8.
Most frequent function failures and their causes
Water is cold
LED is on
The temperature set on the thermostat is too low
Heating element failure
LED is not on
No supply voltage; thermostat failure;
Safety thermostat shut off probably due to failed
operation thermostat
Water is not warm enough
LED is on
Failure of one of the coils in the element (2x
1000W)
Temperature of water is not
corresponding
with the temperature on the
control
Defective thermostat
Water is constantly dripping off
the safety valve
LED is not on
Input pressure too high; faulty safety valve
Do not try to repair the failure yourselves. Seek either expert or service help. It does not take much for an
expert to remove the defect. When making a repair appointment, report the type and serial number you find
on the performance plate of your water heater.
9.
Installation regulations
Regulations and instructions that must be obeyed if the heater is connected
a)
to the electrical network
ČSN 33 2180 - Connecting of electric devices and appliances
ČSN 33 2000-4-41 - Low voltage electric installations Protective measure to ensure safety
- Protection from injury caused by electricity
ČSN 33 2000-7-701 - Low voltage electric installations Single-purpose devices and devices in
special premises - Premises with tub or shower to hot service water heating system
b)
to the hot water heating system
ČSN 06 0320 - Thermal systems in buildings - Hot water preparation – Design and Project
Engineering
ČSN 06 0830 – Thermal systems in buildings – Protecting devices
ČSN 73 6660 – Internal water conduits
ČSN 07 7401 - Water and steam for heat energy device with steam over-pressure up to 8 MPa
ČSN 06 1010 - Tank water heaters with water and steam heating; and combined with electric
heating. Technical requirements.
Testing.
ČSN EN 12897 – Water supply – Indirectly heated closed tank-type water heaters
Both the electric and water installation must follow and meet the requirements and regulations
relevant in the country of use.
