Herz 8251 Datasheet Download Page 8

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HERZ ETKF+

Page 8

Flashing sequences

The LED’s (D) flashing sequences have different meanings:

Flashing sequence

Meaning

1x flash

Window open/ closed, radio
command sent successfully

2x flashes

“Duty cycle” limit reached. The
device will communicate again
after max. one hour.

3x flashes

Error message: wireless command
not sent successfully

Technical characteristics:

Supply voltage:

2x 1,5V AAA, Micro LR03 battery included, typical life
approx 5 years

Current consumption:

Max. 50 mA

Degree of protection:

IP 20

Ambient temperature:

0 to 50 °C

Transmission frequency:

868,3 MHz

Receiver

category:

SRD category 2

Range of transmission in open air:

100 m

Wall The

8251

03)

Mounting dimension in mm (W x H x D): 86 x 86 x 21,5

Summary of Contents for 8251

Page 1: ... typical life approx 2 years Receiver frequency 868 3 MHz Surrent consumption Max 100 mA Ambient temperature 5 C to 50 C Linear stroke 4 2 mm Thread connection M28 x 1 5 Field of application The energy saving thermostatic head ETKF can be installed on all HERZ TRVs with M28 x 1 5 With adapters available sepeately it is possible to mount on the ETKF on valves from other manufactures Function Energy...

Page 2: ...t throw the batteries into a fire Do not short circuit batteries Used batteries should not be disposed of with regular domestic waste Instead take them to your local battery disposal point Step 2 Setting the date and time of day If batteries are inserted or replaced the date and time is automatically requested after a brief display of the firmware version number Set the year month day hour and min...

Page 3: ...vices first Further information about Teaching In the ETKF can be found in the detailed operating manual available online for download on the HERZ homepage Restore factory settings The factory settings of the energy saving thermostatic head ETKF can be restored manually Restoring the factory settings deletes all settings and information about taught in devices First remove the batteries from the b...

Page 4: ... and does not warrant any properties For technical support please contact our service agency The devices concerned are not intended for children and must not be used as toys Do not leave packaging material lying around as children might be tempted to play with it which is extremely dangerous Do not open the device it does not contain any components that need to be serviced by the user In the event...

Page 5: ...hall invalidate any warranty or liability This also applies to any conversion or modification work This device is intended for domestic use only Device Overview The window sensor A B consists of a large electronic unit A and a small magnet B The device is supplied with spacers and caps in white and brown C Teach In button D Device LED Preparing for mounting The window sensor consists of two elemen...

Page 6: ...mounting Screw fastening damages the window frame For those living in rented accommodation this could lead to a landlord making claim for compensation or holding back a tenant s deposit Use a pen to mark the borehole positions E of the electronic unit A and the magnet holder B on the window frame and casement If you are working with a hard surface you should pre drill the holes marked E using a 1 ...

Page 7: ...lation you must teach it in to your system first You can teach in the window sensor directly to the wall thermostat Room solution or the energy saving thermostatic head ETKF Radiator solution Put the device to be taught e g wall thermostat into Teaching In mode according to the corresponding operating manual To activate Teaching In mode of the window sensor press and hold down the Teaching In butt...

Page 8: ...max one hour 3x flashes Error message wireless command not sent successfully Technical characteristics Supply voltage 2x 1 5V AAA Micro LR03 battery included typical life approx 5 years Current consumption Max 50 mA Degree of protection IP 20 Ambient temperature 0 to 50 C Transmission frequency 868 3 MHz Receiver category SRD category 2 Range of transmission in open air 100 m Wall Thermostat 1 825...

Page 9: ...ature within the system With the wall thermostat up to 8 energy saving thermostatic heads ETKF can be comfortably regulated in a room The wall thermostat has an internal sensor that measures the temperature in the room and cyclically transmits it to the ETKF Communication between the components is bidirectional This ensures that the information sent reaches the recipient The device may only be ope...

Page 10: ...arge standard batteries Doing so will present a risk of explosion Do not throw the batteries into a fire Do not short circuit batteries Used batteries should not be disposed of with regular domestic waste Instead take them to your local battery disposal point Mounting You can either use screws or adhesive strips to mount the wall thermostat to a wall in the frame supplied or integrate it into an e...

Page 11: ...ne wall drill the marked two 5 mm holes and insert the plugs supplied If you are working with a wooden wall you can pre drill 1 5 mm holes to make screws easier to insert Now drill the bore holes If you are working with a stone wall drill the marked two 5 mm holes and insert the plugs supplied If you are working with a wooden wall you can pre drill 1 5 mm holes to make screws easier to insert Use ...

Page 12: ...dually change all settings of your system e g configuration of week programs directly via the device Further information about changing the settings of the wall thermostat can be found in the detailed operating manual available online for download on www herz eu Restore factory settings The factory settings of the wall thermostat can be restored manually e g if you want to re install an incorrectl...

Page 13: ...smission is performed on a non exclusive transmission path which means that there is a possibility of interference occurring Interference can also be caused by switching operations electrical motors or defective electrical devices The range of transmission within buildings can differ greatly from that available in the open air Besides the transmitting power and the reception characteristics of the...

Page 14: ...d for private use only Do not dispose of the device with regular domestic waste Electronic equipment must be disposed of at local collection points for waste electronic equipment in compliance with the Waste Electrical and Electronic Equipment Directive The CE sign is a free trading sign addressed exclusively to the authorities and does not include any warranty of any properties For technical supp...

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