STIEBEL ELTRON WWK 222 - Page 23

iNSTallaTiON
Installation
www.stiebel-eltron.com WWK222-302 H | 23
10.3.2 Separate power supply to the impressed current anode
At the factory, the appliance is fitted with rechargeable batteries
that ensure the power supply to the impressed current anode in
the case of a power failure. If regular interruptions to the power
supply are not anticipated, the batteries will not require any main-
tenance.
The rechargeable batteries for the impressed current anode must
be replaced every three years in the following cases:
- The impressed current anode is not separately connected to
a continuous power supply and a switching contact regularly
interrupts the power supply to the appliance.
- The security of supply is inadequate.
Failure to observe this point puts the appliance at risk of damage.
Replacing the batteries can be avoided by connecting the im-
pressed current anode separately to a continuous power supply.
This means the DHW cylinder continues to be protected against
corrosion if the rest of the appliance is switched off, e.g. by a
controlled power supply.
 Remove the appliance cover (see chapter "Cleaning and
maintenance/ Removing the appliance cover").
D0000056083
1
2
1 Strain relief
2 Terminal X0
 Prepare the cables in such a way that each cable terminates
with a wire ferrule.
 Push the cables through one of the cable entries in the appli-
ance casing.
 Route the cables through the strain relief.
 Remove the jumper which leads from X0/N to X0/2 in the de-
livered condition.
 Remove the jumper which leads from X0/L to X0/1 in the de-
livered condition.
X0
2
L
L
N
N
PE
PE
L
N
PE
GNYE
BU
BN
1
1
2
X3
2
3
3
1
1
2
L1 / L2 / L3
N
A
B
D0000059152
A Power supply provided by power supply utility or energy
management system for switching the load (compressor)
B Power supply to impressed current anode and PCB
BN Brown
BU Blue
GNYE Green/yellow
 Connect the cables for the separate power supply to the im-
pressed current anode to X0/1 and X0/2.
!
Material losses
The power supply to the impressed current anode must
be ensured at all times.
10.3.3 Connection with external signal transmitter
Note
The appliance has a second, higher set temperature
which is preset at the factory. This is activated when there
is an external switching signal. Set temperature2 takes
priority over the standard set temperature while there is
an external switching signal.
An external signal transmitter for switching a separate set DHW
temperature (set temperature2) can be connected to terminal
X3/1-2. In the delivered condition, terminal X3/1-2 is not assigned.
If this terminal is connected at the voltage stated in the specifica-
tion (see "Permissible voltage range, external signal transmitter")
(L to X3/1, N to X3/2), the appliance activates set temperature2.
Following a one-off activation (signal is present for at least 1min-
ute), set temperature2 applies for at least 20minutes. Set temper-
ature2 takes priority over set temperature1. When the relevant set
DHW temperature has been reached, the compressor switches off
and remains off for a minimum idle time of 20minutes.
The following diagram illustrates the connections by means of a
sample signal sequence from an external signal transmitter.
Example:
- Water temperature = 62 °C
- Set temperature1 = 61 °C
- Set temperature2 = 65 °C
A
1
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 t [min]
B
1
1
0 2
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 t [min]
D0000034613
A External signal
B Compressor
1 20 min. minimum runtime, set temperature2
2 20 min. minimum compressor idle time
Note
An external signal must be present for at least 60seconds
before the control unit responds to it. For example, this
will prevent a brief burst of sunshine from triggering a
heat-up process which, in the absence of further sun-
light, can no longer be covered using locally generated
PV power.
 Remove the appliance cover (see chapter "Cleaning and
maintenance/ Removing the appliance cover").