6 Installation
Installer and user reference guide
33
RWEYQ8~1 RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1 – 2017.04
In case of heat pump mode
a
a
a
A
B
b
b
b
b
b
b
h
e
f
g
g
d
c
a
Outdoor unit
b
Indoor unit + BS unit
c
Main line
d
Branch line 1
e
Branch line 2
f
Branch line 3
g
No branch is allowed after branch
h
Central user interface (etc...)
A
Outdoor/indoor transmission wiring
B
Master/slave transmission wiring
For the above wiring, always use vinyl cords with 0.75 mm² to 1.25
mm² sheath or cables (2-core wires). 3-core wire cables are only
allowable for the cooler/heater changeover user interface.
6.9.4
To route and fix the transmission wiring
Transmission wiring can be routed through the front side only. Fix it
to the upper mounting hole.
A1P
F1
F1
F2
F2 Q1 Q2
TO IN/D UNIT TO OUT/D UNIT TO MULTI UNIT
A
A
Fix to the indicated plastic brackets (factory installed).
6.9.5
To connect the transmission wiring
The wiring from the indoor units must be connected to the F1/F2
(In‑Out) terminals on the PCB in the outdoor unit.
Tightening torque for the transmission wiring terminal screws:
Screw size
Tightening torque (N•m)
M3.5 (A1P)
0.8~0.96
In case of heat recovery mode
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
In case of heat pump mode
F1
F1
F2
F2 Q1 Q2
TO IN/D UNIT TO OUT/D UNIT TO MULTI UNIT
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2 F1 F2 Q1Q2
Q1 Q2
A1P
e
Q1 Q2
a
h
i
g
f
c
b
d
e
f
a
Outdoor unit PCB (A1P)
b
Unit A (master outdoor unit)
c
Unit B (slave outdoor unit)
d
Unit C (slave outdoor unit)
e
Outdoor unit/other system transmission (F1/F2)
f
Outdoor-outdoor unit transmission (Q1/Q2)
g
Indoor unit
h
Use the conductor of sheathed wire (2 wire) (no polarity)
i
Terminal board (field supply)
▪ 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.
6.9.6
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.
