18 | Electrical installation
Installer and user reference guide
98
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
18.6 To connect the power supply
NOTICE
Never connect the power supply to transmission wiring terminal block. Otherwise
the entire system may break down.
INFORMATION
Installation and routing in case the cool/heat selector is used: refer to the installation
manual of the cool/heat selector.
CAUTION
▪ When connecting the power supply: connect the earth cable first, before making
the current-carrying connections.
▪ When disconnecting the power supply: disconnect the current-carrying cables
first, before separating the earth connection.
▪ The length of the conductors between the power supply stress relief and the
terminal block itself MUST be as such that the current-carrying wires are
tautened before the earth wire is in case the power supply is pulled loose from
the stress relief.
Tightening torque for the terminal screws:
Screw size Tightening torque (N•m)
M8 (power terminal block) 5.5~7.3
M8 (ground)
NOTICE
When connecting the earth wire, align the wire with the cut out section of the cup
washer. Incomplete earthing may cause electrical shock.
The power supply MUST be clamped to the plastic bracket using field supplied
clamp material to prevent external force being applied to the terminal. The green
and yellow striped wire MUST be used for earthing only.
a Power supply (380~415 V, 3N~50Hz)
b Fuse
c Earth leakage protector
d Earth wire
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