ELEKTROMET EJK mini - Turning on and Water Temperature Setting; Overheating Protection

25.07.2014 ZUG ELEKTROMET
7
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, which show the passage of current through the heating
If the temperature controller knob is in its extreme position (snowflake) and the red lamp
does not light up, turn the knob 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. 3) the desired temperature in water tank can be set steplessly in the range
of 5
0
C (turn the knob all the way to the “snowflake” symbol) to 65
0
C (three dots). 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
Prior to re-enabling the thermal protection it is necessary to disconnect the heater form the
power supply.
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 93
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 knob situated in the heater casing cover, using a small flat screwdriver.
Place the screwdriver in the gap between the knob and cover of the heater body (fig. 3). Pry up
the knob with a gentle upward movement and remove it. Using the same screwdriver, bend the
rubber gasket situated under the knob and press the red thermal protection button on the
temperature limiter body (fig. 4). The switching of protection is signalized by the click sound.
This operation shall be carried out only by a properly qualified person, who will define the
cause of the failure and remove it.