Drazice OKC 160 NTR / BP Manuale operativo e di installazione - Pagina 13

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2.5 CONNECTION OF INDIRECT HEATER TO HOT WATER SYSTEM

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 thus 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 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 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 combined heater 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 heater). The valves have to be as close to the heater as possible to avoid

higher thermal losses.

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