20
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Electrical installation
Installer and user reference guide
123
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
20.3 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
INDOOR
UNIT
A
a
1
INDOOR
UNIT
B
INDOOR
UNIT
C
INDOOR
UNIT
D
OUT-
DOOR
UNIT
BS
UNIT
F1 F2 F1 F2 F1 F2 F1 F2
F1 F2 F1 F2
TO
IN/D
TO
OUT/D
F1 F2 F1 F2
TO
MULTI
UNIT
Q1 Q2
a
2
c
d
TO
IN/D
TO
OUT/D
F1 F2 F1 F2 Q1 Q2
F1 F2
F1 F2
F1 F2
F1 F2
OUT-
DOOR
UNIT
BS
UNIT
F1 F2 F1 F2
TO
MULTI
UNIT
b
1
b
2
a1
Unit A (master outdoor unit)
a2
Unit B (slave outdoor unit)
b1
BS unit 1
b2
BS unit 2
c
Indoor unit
d
Outdoor unit/other system transmission (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.
20.4 To finish the transmission wiring
After installing the transmission wires, wrap them along with the onsite refrigerant
pipes using finishing tape, as shown in the illustration below.
d
b
e
a
d
a
c
f
a
Liquid pipe
b
Gas pipe
c
High pressure / low pressure gas pipe
d
Finishing tape
e
Transmission wiring (F1/F2)
