18
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Electrical installation
Installer and user reference guide
117
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
18.3 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 single outdoor unit installation
F
1
F
2
F
1
F
2
Q
1
Q
2
F1
F1
F2
F2 Q1 Q2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
b
c
a
d
e
TO IN/D UNIT TO OUT/D UNIT TO MULTI UNIT
A1P
a
Outdoor unit PCB (A1P)
b
Use the conductor of sheathed wire (2 wire) (no polarity)
c
Terminal board (field supply)
d
Indoor unit
e
Outdoor unit
In case of multi outdoor unit installation
F1 F2 F1 F2 Q1 Q2
Q1 Q2
A1P
d
d
e
f
b
a
c
Q1 Q2
a
Unit A (master outdoor unit)
b
Unit B (slave outdoor unit)
c
Unit C (slave outdoor unit)
d
Master/slave transmission (Q1/Q2)
e
Outdoor/indoor transmission (F1/F2)
f
Outdoor unit/other system transmission (F1/F2)
INFORMATION
U-series units cannot share the same refrigerant circuit with T-series units. However,
electrically, U-series units and T-series units can be connected via F1/F2.
▪
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.
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