17 Electrical installation
Installation and operation manual
41
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P684060-1 – 2022.02
17.4
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.
17.5
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)
f
Insulation
17.6
To route and fix the power supply
The power supply wiring can be routed from the front and left side.
Fix it to the lower mounting hole.
c
X1M
a
b
a
c
d
X1M
b
5~12 HP
14~20 HP
A
A
A
d
d
d
d
a
Power supply (possibility 1)
(a)
b
Power supply (possibility 2)
(a)
c
Power supply (possibility 3)
(a)
. Use conduit.
d
Tie wrap
(a)
Knockout hole has to be removed. Close the hole to
avoid small animals or dirt from entering.
17.7
To connect the power supply
The power supply MUST be clamped to the 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.
14~20 HP
a
b
c
d
f
g
e
i
j
h
a
Power supply (380~415 V, 3N~ 50 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)
h
Tie wrap
i
Cup washer
j
When connecting the earth wire, it is recommended to
perform curling.
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:
