30
Connecting power and communication cable
Specifications of the cable protection tube
Name
Material
Applicable conditions
Flexible PVC
conduit
PVC
When the cable tube is installed indoor and not exposed to outside, because it is
embedded in concrete structure
Class 1 flexible
conduit
Galvanized steel sheet
When the cable tube is installed indoor but exposed to outside so there are risk
of damage to the cable tube
Class 1 PVC coated
flexible conduit
Galvanized steel sheet
and Soft PVC compound
When the cable tube is installed outdoor and exposed to outside so there are risk
of damage to the cable tube and extra waterproof is needed
Power and communication wiring diagram
R
S
T
N
Communication cable
between indoor and
outdoor units
PBA
Indoor and outdoor unit
communication
Earth
Earth
DVM Hydro unit / Hydro unit HT
ELCB +
ELB
ELCB
or
f
The communication cable between indoor and outdoor units has no polarity.
f
Arrange the cables using a clamp attached on the left side of the terminal board.
f
When you connect the power cable, you must apply rated tightening torque to connect the screws for the terminal board
(L-N).
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