INSTALLATION
Electrical connection
18
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Terminal XD02: Appliance and electric emergency/booster
heater (DHC)
f
f
Connect the power supply for the electric emergency/booster
heater to terminal XD02 if you want to utilise the following
appliance functions:
Appliance func-
tion
Effect of the electric emergency/booster
heater
Mono energetic op-
eration
If the dual mode point is undershot, the electric emer-
gency/booster heater safeguards both the heating op-
eration and the provision of high DHW temperatures.
Emergency mode
If the heat pump shuts down due to a fault, the heating
output is covered by the electric emergency/booster
heater.
Heat-up program
(only for underfloor
heating systems)
Where return temperatures are <25 °C, the electric
emergency/booster heater must provide the necessary
heat for screed drying.
With such low system temperatures, the heat for screed
drying must not be provided by the heat pump, other-
wise the frost protection of the appliance can no longer
be guaranteed during the defrost cycle.
When the heat-up program has ended, the electric
emergency/booster heater can be disconnected if it is
not required for appliance operation.
Please note that during the heat-up program, emergen-
cy mode is not available.
Pasteurisation mode
The electric emergency/booster heater starts automat-
ically when pasteurisation mode is active. The DHW is
then regularly heated to 60 °C to protect it against the
growth of legionella bacteria.
Heat pump terminal assignment
1
1
2
2
D
00000
71
63
4
XD01
Heat pump (WP)
L1, N, PE
XD02
Emergency/booster heater (DHC)
L1, N1, L2, N2, PE
Connected
load [kW]
Cable
cross-section
[mm²]
Terminal assignment
2,9
2,5
PE
L2
N2
5,9
2,5
PE
L2
N2
2,5
PE
L1
N1
XD03
Control unit
EVU (power supply utility) L’, EVU (power supply utility) L, L, N, PE
f
f
Connect the electrical emergency/booster heater cables to
deliver the required rating as detailed in the table.
Heat pump manager terminal assignment
WARNING Electrocution
Only components that operate with safety extra low
voltage (SELV) and that ensure secure separation from
the mains voltage supply may be connected to the low
voltage terminals of the appliance.
Connecting other components can make parts of the ap-
pliance and connected components live.
f
f
Only use components which have been approved by
us.
X2.2 X2.3
X2.4
X2.5
X2.6
X2.7
X2.8
X2.9
X2.10 X2.11 X2.12 X2.13
X2.14
X2.15
X1.1
CAN A
X1.19
CAN A
X1.18
CAN B
X1.17
X1.16
X1.15
X1.14
X1.13
X1.12
X1.2
CAN B
X1.3 X1.4 X1.5 X1.6 X1.7 X1.8 X1.9 X1.10 X1.11
X2.1
D
00000
71
84
1
Safety extra low voltage
X1.1
CAN A
+
-
L
H
+
-
L
H
CAN (connection for heat pump and WPE heat
pump extension)
X1.2
CAN B
+
-
L
H
+
-
L
H
CAN (connection for FET remote control and
ISG Internet Service Gateway)
X1.3
Signal
Earth
1
2
Outside temperature sensor
X1.4
Signal
Earth
1
2
Buffer sensor (heating circuit sensor 1)
X1.5
Signal
Earth
1
2
Flow sensor
X1.6
Signal
Earth
1
2
Heating circuit sensor 2
X1.7
Signal
Earth
1
2
Heating circuit sensor 3
X1.8
Signal
Earth
1
2
DHW cylinder sensor
X1.9
Signal
Earth
1
2
Source sensor
X1.10
Signal
Earth
1
2
Heat source 2 (2.WE)
X1.11
Signal
Earth
1
2
Cooling flow
X1.12
Signal
Earth
1
2
DHW circulation sensor
X1.13
Signal
Earth
Signal
1
2
3
FE7 remote control / telephone remote
switch / heating curve optimisation / SG Ready
X1.14
Constant 12 V
Input
GND
+
IN
Analogue input 0-10 V
X1.15
Constant 12 V
Input
GND
+
IN
Analogue input 0-10 V
X1.16
Signal
Earth
1
2
PWM output 1
X1.17
Signal
Earth
1
2
PWM output 2