63
Terminals
Function
Explanation
LP1 X3.12
LP1 X3.13
or at exter-
nal exten-
sion H1
Signal "External demand"
(external starting of com-
pressor and pumps, mixer
in control operation or
OPEN, changeover of op-
erating mode of several
system components)
Requires zero volt
N/O
contact:
■ Closed: Demand
■ Open: No demand
■ Breaking capacity 230 V, 2 mA
Note
■ These or further external functions, such
as swimming pool water heating, cas-
cade or external set value default can
alternatively be connected via external
extension H1 (see installation instruc-
tions "External extension H1").
■ If a swimming pool water heating facility
is connected to external extension H1,
no other external function can be con-
nected to external extension H1.
K2 220.2
K2 220.3
Only for 2-stage heat
pumps:
Blocking compressor 2 in
connection with DHW
heating
Connection, see separate "connection and
wiring diagram" sheet 20.
STB 1
STB 2
High limit safety cut-out
(max. 70 °C) for shutting
down the secondary pump
in conjunction with an ex-
ternal heat source
Connection in series with the secondary
pump (terminal 211.2 on main PCB), see
separate "connection and wiring diagram"
sheet 20.
Installation sequence
Overview of electrical connections
(cont.)
5772 458 GB
Installation
