Commissioning; Junction Box; Temperature Sensor; Initial Start-Up - STIEBEL ELTRON WWS 20 Bedienung Und Installation

INSTALLATION

Commissioning

10.5.2 Junction box

Material losses
!
Applying voltage to the switching inputs at the junction
box could destroy the contacts.
f Never apply any voltage to the switching inputs. f
f Always use floating contacts. f
A junction box is permanently wired to the back of the appliance
to enable you to connect optional inputs and outputs or an im-
mersion heater. You can find the connection diagram inside the
cover of the junction box.
9 N PE F1
F1 Controller sensor
F2 Optional display sensor
E2 Power supply utility shutdown
E3 Power supply utility shutdown, set value increase or ex-
ternal fan control
Material losses
!
The booster heater is connected at pin 9, N and PE. The
max. permissible connected load is 2 kW.

10.6 Temperature sensor

Contact Description
F1 DHW cylinder middle
Control sensor for heat pump and immersion heater,
Standard display sensor to show actual temperature inside the
DHW cylinder
F2 Optional display sensor to show actual temperature inside the top
(optional) of the DHW cylinder
Activate by pressing the Up button while in standard display
10.6.1 Contact F1
Contact F1 as control sensor input
f Connect the DHW cylinder temperature sensor supplied at f
the factory to contact F1.
Contact F1 as external switching input
Material losses
!
Applying voltage could destroy contact F1.
f Never apply any voltage to contact F1. f
f Always use floating contacts. f
Contact F1 can be configured as a switching input which allows
an external DHW demand.
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F2 E2 E3
F2
F1
Contact F1 then loses its measuring capability. This makes it im-
possible to control temperature via a heat pump control unit.
Depending on your settings, only the heat pump or all the enabled
heat sources will become active.
Example: Contact closed = DHW demand
Contact F1 configuration
Symbol Parameter Description
PSEt A02 Configuration of contact F1
└SEt
1 = Control sensor in DHW cylinder
0 = Switching input for external heat demand
11. Commissioning

11.1 Initial start-up

Material losses
!
Never connect the appliance to the power supply before
the DHW cylinder is filled.
11.1.1 Filling the DHW cylinder
1
2
4
1 DHW outlet
2 Cold water inlet
3 Hot water draw-off point
4 Shut-off valves
3
WWS 20 | 55