6 Installation
Installer and user reference guide
34
RWEYQ8~1 RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1 – 2017.04
b
a
f
c
d
f
e
f
a
Liquid pipe
b
Gas pipe
c
Finishing tape
d
High pressure/low pressure gas pipe
e
Transmission wiring (F1/F2)
f
Insulator
6.9.7
To route and fix the power supply
NOTICE
When routing earth wires, secure clearance of 25 mm or
more away from compressor lead wires. Failure to observe
this instruction properly may adversely affect correct
operation of other units connected to the same earth.
The power supply wiring can be routed from the front side. Exit the
wiring via the upper mounting hole.
A1P
6.9.8
To connect the power supply
NOTICE
Never connect the power supply to transmission wiring
terminal block. Otherwise the entire system may break
down.
CAUTION
When connecting the power supply, the earth connection
must be made before the current-carrying connections are
established. When disconnecting the power supply, the
current-carrying connections must be separated before the
earth connection is. 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
Recommendations when connecting the earth wire:
Wire it so that it comes through the cut out section of the
cup washer. (An improper earth connection may prevent a
good earthing from being achieved.)
The power supply must be clamped to the plastic bracket using field
supplied clamp material.
The green and yellow striped wire must be used for earthing only
(refer to the figure below).
e
i
f
b
a
c
d
h
e
g
a
Power supply (380~415 V - 3N~ 50 Hz
OR
400 V -
3N~ 60 Hz)
b
Fuse
c
Earth leakage protector
d
Earth wire
e
Power supply terminal block
f
Connect each power wire: RED to L1, WHT to L2, BLK to
L3 and BLU to N
g
Earth wire (GRN/YLW). When connecting the earth wire, it
is recommended to perform curling.
h
Clamp the power supply to the bracket using a field
supplied clamp to prevent external force being applied to
the terminal.
i
Cup washer.
Multiple outdoor units
To connect the power supply for multiple outdoor units to each other,
ring tongues have to be used. No bare cable can be used.
In that case, the ring washer that is installed by default should be
removed.
Attach both cables to the power supply terminal as indicated below:
L1 L2 L2 N
6.9.9
To connect the optional wiring
For the optional wiring use insulated wires of a rated voltage of
250 V or higher and a minimal cross section of 1.25 mm² for single
core wires and 0.75 mm² for multicore wires.
Variable water flow
The variable water flow output signal is a low voltage control signal
which generates an output of 2~10 V DC depending on the required
water flow rate through the plate heat exchanger. For more
information, see
"5.4.4 About the water flow rate" on page 20
.
NOTICE
The maximum output power of the 2~10 V DC output
signal is 50 mW. Exceeding this power can result in
damage of the system.
Always use shielded cables with a minimal cross section of
0.75 mm² and a length limited to 100 m.
