English; Operating Instructions; The Most Important Points In Brief; Operation - STIEBEL ELTRON FFB 1 Gebrauchs- Und Montageanweisung

1. Operating instructions

1.1 Description
FFB 1 and FFB 2 enable the radio remote
control (433 Mhz) of the Stiebel Eltron DHE
electronic comfort instantaneous water heaters.
FFB 1
! Radio control unit ( 1 )
! Wall bracket with fixings ( 2 )
! Receiving module ( 3 )
FFB 2
! Radio control unit ( 1 )
! Wall bracket with fixings ( 2 )
The FFB 2 operates only in combination with
the receiving module of the FFB 1.
Following installation of the FFB 1, the DHE
(instantaneous water heater) can be adjusted
using the radio remote control or it can be
adjusted directly at the control section of the
unit. The radio control unit is waterproof
(IPX7) and therefore can also be used when
taking a shower or bath. The operating range
of the radio control unit is approximately
25 m within a building. In addition to the
FFB 1 radio control unit, up to 5 fur ther
FFB 2 radio control units can communicate
with the receiving module in the DHE.
The most important points
in brief
Temperature selection –
adjustable between 30 °C and
60 °C in 0.5 °C steps
Memory push buttons – Storage
and recall of 2 setpoint tempera-
tures by the user
Changing the batteries
6
for the user and the professional
Because each radio control unit has an indivi-
dual sender code, an FFB 2 must first be
registered with the receiving module (see
"First start-up - FFB 2").
In the case of the FFB 1, the sender code of
the radio control unit is pre-registered at the
factory.

1.2 Operation

The radio control unit is normally in energy
saving mode (display switched off). The
control unit is activated by briefly pressing any
push-button (7). If a push-button is not
operated within 20 seconds in the activated
mode, the control unit automatically switches
back to energy saving mode.
If the control unit is activated using the
push-button, the setpoint which was last
set is indicated and transmitted to the DHE.
A change to the setpoint temperature can
subsequently be made by single presses on
the push-buttons in 0.5 °C steps, or
by holding the push-buttons down for rapid
forward or reverse mode (scrolling).
Activation by pressing the
push-buttons causes the corresponding stored
value to be displayed and transmitted. This
enables the simple and rapid selection of a
frequently used setpoint temperature.
Each operation of a push-button is confirmed
on release of the push-button by an acoustic
signal (bleep) from the receiving module built
into the DHE. This signal can be deactivated
by a qualified installer if the customer so wishes.
1.2.1 Memory push-button settings
To change the settings of the memory push-
buttons, the desired setpoint should be
adjusted in the display (6), and the
corresponding memory push-button should
then be pressed for approximately 3 seconds.
A short fade-out of the display confirms that
the temperature has been stored.
Where several radio control units are used,
each radio control unit has two storage
locations of its own. This means that the
push-buttons can be adjusted totally
individually on each radio control unit and in
the DHE.
1.2.2 Anti-scald protection
When using more than one radio-remote
control unit the priority of temperature
selection is given to the unit that first sends
the signal. This priority lasts during the water
flow and for 2 minutes after the water outlet
has been switched off. The priority is de-
activated automatically. During the time in
which the priority setting is activated it is only
possible to reduce the water temperature
setting. If the set temperature is at 43 ºC or
less the Anti-scald protection is activated, this
means that it is impossible for any radio-
remote control unit to increase the tempera-
ture above 43 ºC during the duration of
water flow. Although the display on the control
unit and the DHE will show the selected
higher temperature, the water temperature
will be limited to maximum of 43 ºC.
Simultaneous use of the different ra-
dio-remote controls can mean that
the actual temperature shown on the
displays is different to the actual water
temperature. Only the priority unit will
show the actual temperature.
Water temperatures above 43 ºC can
cause scalding.
1.2.3 Operation of the DHE
Operation of the instantaneous water heater
is also possible in the usual way. Operation via
the radio link does however always have
or priority.
If a setpoint adjustment is made by radio
control, the internal operating device is
blocked during the current drawing off of
water. Two minutes after drawing off has
finished, the DHE operating device is automa-
tically released once again.
If a temperature is set at the DHE operating
device for drawing off water and an adjust-
memory
ment by the radio link is to be prevented, the
temperature adjustment knob on the DHE
should be pressed before drawing off. Five
minutes after drawing off has been com-
pleted, this block is automatically lifted (by
pressing the adjustment knob again the block
can also be lifted at an earlier point in time).
1.2.4 Changing the batteries
The radio control unit is supplied by 2 lithium
cells (construction type CR2032 or CR2025).
If a change of batteries is required, the
symbol appears in the display.
Used batteries must be removed. We
cannot be made responsable for
damages caused by leaked batteries!
To change the batteries, the lower section of
the casing (5) should be unscrewed and both
batteries in the battery holders (8) replaced.
Pay attention to the correct polarity of the
batteries ( + towards the top). Always use the
same type of batteries and change in pairs.
During changing of the batteries, the stored
values for the
maintained.
Batteries should be recycled!
When fitting the lower section of the casing,
care should be taken to ensure that the seal
(9) is correctly seated in the upper section of
the casing (4), so that the water-tightness of
the control unit remains guaranteed.
1.2.5 Guidance on the radio link
Special conditions in buildings can lead
to a reduction in the signal strength of
radio waves. The operational range of the
remote control can be reduced in such cases.
Since the employed frequency range of
433 MHz is also freely available for other
applications (radio controlled thermostats,
push-buttons are