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16
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Figure 12
2.5
OPERATION
a)
Water heating by electric energy
After the heater is connected to electric network, the heating element starts heating water. The element
is turned on and off by a thermostat. After reaching the temperature set, the thermostat switches off
the electric circuit and discontinues water heating. The control light signals if the element is in operation
(light is on) or if it is off (the light goes out). In case of longer operation without using the heated volume,
the thermostat has to be set to position 5°C to 8°C (set the “snowflake” symbol on the thermostat selector)
to avoid its freezing, or electricity supply to the heater has to be switched off. In combined versions,
the stop valve on the inlet to the exchanger has to be closed at the inlet to the heat exchanger while which
prevents heating the water in the hot water heating system.
b)
Service water heating via thermal energy through heat exchanger
Closing valves of the heat exchanger must be opened which ensures heating water flow from the hot water
heating system. Together with the closing valve, it is recommended to install an air outlet valve at the inlet
to the heat exchanger in order to bleed the heat exchanger as needed, in particular before the beginning
of the heating season (Figure 9). The time it takes to heat up using the heat exchanger depends
on the temperature and flow of water in the hot water heating system.
A combined heater is made
in universal design
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depending on the need of connecting the closing valves to the heating element either
from the right, or from the left.
2.6
FIRST COMMISSIONING
After connecting the heater to the water supply, the hot water heating system, the electric
network, and after testing its safety valve (based on the valve manual attached), the heater may
be put into operation. Before opening the power supply, the tank must be filled with water.
The process of first heating must be executed by licensed professional who has to check it. Both
the hot water outlet pipe and safety armature parts may be hot.
