8
4. Turning on and water temperature setting
After the power is turned on (the plug is placed in the socket), both
signal lamps situated on the casing cover should light up:
- green lamp, which shows that power is on,
- red lamp, which shows the passage of current through the heating
element.
If the temperature controller knob is in its extreme left position and the
red lamp does not light up, turn the knob to the right until the contacts in the
temperature controller close. It is recommended to supervise the first heating
of water, remembering that during heating process the volume of water in
pressure tank expands and it must be evacuated through the safety valve or
accumulated in a diaphragm expansion vessel.
The heater power is cyclically turned on and off by the temperature
controller as hot water cools down or is consumed. The temperature
controller cooperates with the capillary sensor placed in a special protective
pipe, immersed in water. By turning the temperature controller knob (tab. 4)
the desired temperature in water tank can be set steplessly up to +70
0
C
maximum (turn the knob all the way to the right). When the set temperature is
achieved, temperature controller shall automatically turn off the power supply
to heating elements and shall turn it on again when water temperature drops
below the set temperature.
5. Overheating protection
The heater is protected against overheating by a non-automatic
temperature limiter, the so-called STB, which cuts off the current flow to the
heating unit in case of failure of the temperature controller and a temperature
rise over 90
0
C. Power can be turned on again only after the heater cools down
and the button situated on the temperature limiter body is pressed. To do so,
remove the hole plug 8 (fig. 1) situated in the heater casing cover, and then
press the button using a small screwdriver for example (unplug the device
first). This operation shall be carried out only by a properly qualified person,
who will define the cause of the failure and remove it.
6. Anti-freeze protection
The temperature controller used in the heater is provided with an anti-
freeze protection feature to maintain the temperature of water in tank in the
level of +5
0
C. This feature can be turned on by turning the temperature
controller knob all the way to the left. The heater is not turned off in this
position, it is anti-freeze protection only.
