Electrical connection
AW 4 | 5 | 7 OR-S – 6721866761 (2023/06)
18
Fig. 32 CAN-BUS heat pump - indoor unit
[A] Heat pump
[B] Indoor unit
[Vcc] 24V= (24VDC)
[H] HIGH
[L] LOW
[GND] gnd
The heat pump and indoor unit are connected to each other by a
communication line, the CAN-BUS [24VDC, class III (SELV)].
A LIYCY cable (TP) 2 x 2 x 0.75 (or equivalent) is suitable as an
extension cable outside of the unit. Alternatively, twisted pair cables
approved for outdoor use with a minimum cross-section of 0.75 mm
2
can be used.
The maximum permissible cable length is 30 m.
The connection is made with four wires, as the 24VDC supply is also
connected. The 24VDC and CAN-BUS connections are marked on the
module.
The CANBUS cable has two pairs of twisted wires. Vcc and GND is one
pair, H and L is the second pair. Maximum cable insulation striping length
for all cables is 120mm. Maximum wire striping is between 8-10mm.
Fig. 33 Wire striping CAN-BUS
7.2 Connect the heat pump
Proper strain-relief of the electric cables must be ensured. Use cable-ties
to fasten the cables on the back plate of the electric box.
▶ Route the connection cables through the cable ducts.
– Remove the rubber grommet from the outdoor unit for the
respective cable.
– Pierce the rubber grommet and place it on the cable.
– Feed the cable through the cable channel so that a sufficient part
of it comes through.
– Remount the rubber grommet in the hole on the outdoor unit.
▶ Connect the cables according to the wiring diagram.
▶ Tighten the cable-ties firmly.
▶ Reattach the side cover.
Fig. 34 Cable channels
[1] CAN-BUS
[2] Mains feed
B
GND
L
H
Vcc
Vcc
L
H
GND
HIGH
LOW
gnd
CAN BUS
12
34
HIGH
LOW
gnd
CAN BUS
12
34
24V=
A
0010049010-001
≤10 mm
≤120 mm
0010041915-001
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