iNSTaLLaTiON
Power supply
www.stiebel-eltron.com
WPL 34 | WPL 47 | WPL 57 |
11
Maximum temperature differential on the heating side with buffer
cylinder:
1
0
2
4
6
8
10
-15 -10
-5
0
5
10
15
20
25
30
D
00000
63
55
0
1 Nominal flow rate
X Outside temperature [°C]
Y Maximum temperature differential [K]
f
f
Make the settings at the circulation pump when the temper-
ature differential between the flow and return temperature
has stabilised.
f
f
Compare the resulting temperature differential between the
flow and return at the appliance with the diagram “Maxi-
mum temperature differential on the heating side with buffer
cylinder”.
f
f
Set the buffer charging pump so that the maximum tempera-
ture differential is achieved or undershot.
f
f
If the appliance will be used for DHW heating, check the set-
ting of the delivery head in DHW mode.
f
f
If necessary, adjust the delivery head setting for the DHW
primary pump.
f
f
Set the buffer charging pump and the DHW primary pump to
∆p constant.
10.7 Condensate drain
A pipe for the condensate drain is fitted at the factory to the defrost
pan. The pipe terminates near the aperture on the floor plate. The
appliance is supplied with a two meter hose with elbow plug-in
fittings for draining the condensate.
f
f
Secure the hose supplied on the pipe of the defrost pan.
10.8 Second heat source
For dual mode systems, always connect the heat pump into the
return of the second heat generator (e.g. oil boiler).
10.9 Safety temperature controller for underfloor
heating system STB-FB
!
Material losses
In case of failure, in order to prevent an excessively high
flow temperature in the underfloor heating system, we
generally recommend the use of a safety temperature
controller to limit the system temperature.
11. Power supply
11.1 General
WARNING Electrocution
Before working on the appliance, isolate it from the
power supply at the control panel.
Please observe the heat pump manager operating and installation
instructions.
Only qualified electricians must carry out the installation in ac-
cordance with these instructions.
Permission to connect the appliance may need to be obtained from
your local power supply utility.
11.2 Wiring chamber
The terminal box is located on the air outlet side.
f
f
Open the junction box as shown:
26
�0
3�
01
�1
41
2
Note
The wiring diagram of the appliance is located behind
the cover.
Use appropriate cables in accordance with local regulations for
all connections.
f
f
Route the cables through the knock-out in the floor, through
the cable trunking and upwards into the junction box.
f
f
Route the electrical cables through the cable entries with
strain reliefs.
f
f
Check the function of the strain relief fittings.