28
High limit safety cut-out for heat pump in conjunc-
tion with an external heat source
222.3
222.4
A
X3.1
X2.N
C
B
K1
D
Fig. 21
A
Terminals on extension PCB
B
Move jumper from X3.1 to 222.3
C
Connection on the external heat source at termi-
nals for external demand
D
High limit safety cut-out (max. 70
°
C) as heat
pump protection
K1 Relay; sizing in accordance with the external heat
source; observe safety instructions
Plug
sXF
Terminals
Function
Explanation
224.7
Circulation pump for DHW reheating
or
Connection values
■
Max. output: 100 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
Control of the immersion heater EHE
(for connection, see the following dia-
gram)
Immersion heater 400 V~
224.7
X2.N
N
L3
L2
L1
?
B
A
Fig. 22
A
Immersion heater, power supply 3/N/PE
400 V/50 Hz
B
Terminals of the heat pump control unit
Immersion heater 230 V~ (on site)
224.7
X2.N
N
L1
L1
L1
?
B
A
N N
Fig. 23
A
Immersion heater, power supply 1/N/PE
230 V/50 Hz
B
Terminals of the heat pump control unit
Installation sequence
Electrical connection
(cont.)
5700 542 GB
Installation
