48
Terminals
Function
Explanation
X3.8
X3.9
P
Pressure switch, primary
circuit
and/or
Requires zero volt
N/C
contact:
■ Closed: Safety chain has continuity
■ Open: Safety chain interrupted; heat
pump shut down
■ Breaking capacity 230 V~, 0.15 A
■ Connected in series if 2 safety compo-
nents are installed
■
Insert jumper if no safety compo-
nents are installed.
Frost stat
or
Jumper
X3.10
X3.11
Fault message, lag heat
pump in a cascade
or
Jumper
Requires floating N/C contact:
■ Closed: No fault
■ Open: Fault
■ Breaking capacity 230 V~, 0.15 A
No jumper should be installed if a mes-
sage contact is connected.
X3.12
X3.13
"External demand" signal
(external starting of com-
pressor and pumps; mixer
in control mode or OPEN,
changeover of the operat-
ing status of several system
components)
Requires floating N/O contact:
■ Closed: Demand
■ Open: No demand
■ Breaking capacity 230 V, 2 mA
Note
■ These and further external functions,
such as provision of external set val-
ues, can alternatively be connected via
EA1 external extension.
Installation instructions "EA1
extension"
Installation sequence
Electrical connections
(cont.)
5546 267 GB
