15 Electrical installation
Installation and operation manual
30
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1D – 2020.10
In case of heat recovery system
F
1
F
2
F
1
F
2
Q
1
Q
2
F1
F1
F2
F2 Q1Q2
g
e
TO IN/D UNIT TO OUT/D UNIT TO MULTI UNIT
A1P
Q
1
Q
2
A1P
Q
1
Q
2
A1P
a
b
c
d
f
F1 F2F1 F2
F1 F2F1 F2
TO IN/D
UNIT
TO OUT/D
UNIT
TO IN/D
UNIT
TO OUT/D
UNIT
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
j
i
i
h
h
e
a
Unit A (master outdoor unit)
b
Unit B (slave outdoor unit)
c
Unit C (slave outdoor unit)
d
Outdoor unit PCB (A1P)
e
Master/slave transmission (Q1/Q2)
f
Outdoor/indoor transmission (F1/F2)
g
Outdoor unit/other system transmission (F1/F2)
h
BS unit
i
Indoor unit
j
Cooling-only VRV indoor unit / Heating-only Hydrobox unit
▪ The interconnecting wiring between the outdoor units in the same
piping system must be connected to the Q1/Q2 (Out Multi)
terminals. Connecting the wires to the F1/F2 terminals results in
system malfunction.
▪ The wiring for the other systems must be connected to the F1/F2
(Out-Out) terminals of the PCB in the outdoor unit to which the
interconnecting wiring for the indoor units is connected.
▪ The base unit is the outdoor unit to which the interconnecting
wiring for the indoor units is connected.
15.5
To finish the transmission wiring
After installing the transmission wires inside the unit, wrap them
along with the on-site refrigerant pipes using finishing tape, as
shown in figure below.
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
15.6
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
15.7
To connect the power supply
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.
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
