Installation
11
Compress 7400i AW – 6721840487 (2021/10)
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. In doing so, only earth the shielding on one side (indoor
unit) and to the casing.
The maximum permissible cable length is 30 m.
The connection is made with four wires, as the 12 V supply is also
connected. The 12 V and CAN-BUS connections are marked on the PCB.
The "Term" changeover switch identifies the start and end of CAN-BUS
loops. The I/O module board in the heat pump must be terminated.
Fig. 14 Termination CAN-BUS
Connecting the heat pump
A CAN-BUS signal cable with the minimum dimensions 4 x 0.75 mm
2
and a maximum length of 30 m must be routed between the heat pump
and indoor unit.
▶ Release belt (Velcro fastener).
▶ Remove the lock of the control device.
▶ Feed the connecting lead through the cable conduits. Use tension
springs if required.
▶ Connect cable as shown in the wiring diagram.
▶ Tighten all cable fixings if required.
▶ Reattach the cover of the control device.
▶ Reattach the belt.
Fig. 15 Cable conduits and control device
[1] Cable conduit, power supply
[2] Cable conduit CAN-BUS
[3] Connection CAN-BUS
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