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(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 appliance has to be switched off. In combined versions,

the stop valve on the inlet to the exchanger has to be closed, which prevents heating 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 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 (Fig. 1) as needed, in particular before the

beginning of the heating season (figure 3). 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 appliance is made in universal

design – depending on the need of connecting the closing valves to the heating element either from the

right, or from the left.

It is recommended to install stop valves on the heating water inlet and outlet (for possible

dismantling of the appliance). The valves have to be as close to the appliance as possible to

avoid higher thermal losses.

Figure 5

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