EEHR Electric screw-in heating element — 18.05.2018 English —
The following points must be observed for closed systems:
• Provide a certified pressure relief device.
• Note that water may drip from the discharge pipe of the pressure relief device. This pipe must be left open to atmosphere, be
located in a frost free environment and be installed with a continuous downward inclination.
• Regularly test the functioning of the pressure relief device. Also use the function test to remove limescale deposits and to ensure
that the pressure relief device is not blocked.
If a pressure-free connection exists, provide recirculation and shut-off valves as well as a commercial fitting for the pressure-free
ATTENTION
Attention – Device damage due to dry-running!
Dry operation of the heater is not permitted and will result in the heater being damaged. It may then no longer be used.
• The device heating elements must be covered with water.
• Ensure a sufficient water level in the storage tank.
The device will be ready for commissioning when the tasks described in the "Installation" chapter have been completed:
• The installation in the storage tank is completed.
• The electrical connection has been created by a trained electrician according to applicable national and local regulations. The indicator lamp
indicates whether there is a voltage at the heating element.
Use the control knob on the device to set the required temperature.
• The device heats up the water.
Allow for the water heating time. Heating may require several hours and depends on the following conditions:
• The power of the device.
• The initial temperature of the water.
• Storage tank volume.
• Volume of drinking water removed during heating.
Escaping hot medium can cause burns.
• Maintain a sufficient distance from the escaping medium.
• Wear suitable personal protective equipment (safety gloves and goggles).
Thermal disinfection is usually performed within a facility system. The disinfection depends on the facility size.
After device commissioning, complete a thermal disinfection process for the facility system. Legionella bacteria are killed at a water temperature of
> 70 °C.
Ensure these prerequisites for the plant system are fulfilled:
• All water drawing points must be closed.
Ensure a water temperature of 70 °C upstream of the device heating area as follows.
Proceed as follows:
1. Use the control knob on the device to set the temperature to 75°C. (Max. possible temperature on the adjustment wheel is 75°C.)
– The device heating elements heat the water.
2. Open a tap.
3. Catch the water in an appropriate container.
4. Verify that the temperature of the discharging water is about 70°C.
– Continuous 70°C temperature for three minutes.
5. After three minutes, close the tap.
Thermal disinfection is completed.
According to the Deutsche Verein für Gas- und Wasserfach e.V. [German association for gas and water professionals], a plant system for
heating domestic hot water must be thermally disinfected.
• Refer to worksheet W551.
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