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2.5
CONNECTION OF STORAGE TANK TO HOT WATER HEATING
SYSTEM
a)
Water heating by electric energy
After the storage tank 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 storage tank 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 a 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 4). . The time of heating using the heat exchanger depends on the temperature and flow of water in
the hot water heating system. A storage tank 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 storage tank). The valves have to be as close to the storage tank as
possible to avoid higher thermal losses.
2.6
EXAMPLES OF STORAGE TANKS CONNECTION
Connecting a storage tank to a heating circuit
The storage tank is placed on the ground, next to the heating source, or in its vicinity. The heating circuit is
connected to marked inputs and outputs of the storage tank exchanger; the deaeration valve is mounted in
the highest place. It is necessary to install a filter into the circuit in order to protect the pumps, the three-
way valve, and backflow flaps, and the exchanger from sedimentation. It is recommended to flush the
heating circuit before the assembly. All wiring connections must be properly insulated from heat.
If the system works with priority heating of HSW using a three-way valve, always follow the installation
instructions of the three-way valve’s manufacturer.
Connecting a storage tank to a hot water distribution
Cold water shall be connected to an inlet marked with a blue ring and writing “HSW INLET”. Hot water shall
be connected to an outlet marked with a red ring or writing “HSW OUTLET”. If the hot service water (HSW)
Summary of Contents for OKCE 100 NTR
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