46
Terminals
Function
Explanation
Note
■ No parameters need to be set
■ No jumper should be installed if a pow-
er-OFF contact is connected.
■ The compressor is "forced" off as soon
as the contact opens.
■ The power-OFF contact signal
switches off the supply voltage to the
relevant components, subject to power
supply utility.
■ For the instantaneous heating water
heater, the stages to be switched off
can be selected ("Output for instant.
htg wtr heater at power-OFF 790A").
■ The power supply for the heat pump
control unit (3 x 1.5 mm
2
) and the cable
for the power-OFF signal can be com-
bined in a single 5-core cable.
X3.8
X3.9
■ Contact humidistat
or
■ Jumper
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
Insert jumper if no safety components
are installed.
X3.10
X3.11
■ Fault message, lag heat
pump in a cascade
or
■ Jumper
Requires zero volt
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.
Installation sequence
Electrical connections, heat pump control unit
(cont.)
5516 436 GB
