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Electrical installation
Installer and user reference guide
110
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
In case of heat pump system
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)
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.