15 Electrical installation
Installation and operation manual
29
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1D – 2020.10
Example
Combining the RWEYQ30T9 by using the RWEYQ8T9,
RWEYQ10T9, and RWEYQ12T9.
▪ Minimum
circuit
ampacity
of
the
RWEYQ8T9=15.5 A
▪ Minimum
circuit
ampacity
of
the
RWEYQ10T9=16.4 A
▪ Minimum
circuit
ampacity
of
the
RWEYQ12T9=19.4 A
Accordingly, the minimum circuit ampacity of the
RWEYQ30T9=15.5+16.4+19.4=51.3 A
Multiply the above result by 1.1: (51.3 A×1.1)=56.43 A
⇒
the recommended fuse capacity would be
63 A
.
NOTICE
When using residual current operated circuit breakers, be
sure to use a high-speed type 300 mA rated residual
operating current.
15.2
Field wiring: Overview
In case of heat pump system
a
b
d
d
d
c
b
g
g
h
h
c
f
h
e
a
h
i
f
f
e
e
h
h
h
h
a
Field power supply (with earth leakage protector)
b
Main switch
c
Earth connection
d
Outdoor unit
e
Indoor unit
f
User interface
g
Indoor power supply wiring (sheathed cable) (230 V)
h
Transmission wiring (sheathed cable) (16 V)
i
Outdoor power supply wiring (sheathed cable)
Power supply 3N~ 50 Hz
Power supply 1~ 50 Hz
Earth wiring
In case of heat recovery system
B
i
a
b
f
c
f
e
g
d
c
h
j
j
i
a
Field power supply (with earth leakage protector)
b
Main switch
c
Earth connection
d
Outdoor unit
e
Indoor unit
f
User interface
g
BS unit
h
Cool/heat selector
i
Circuit breaker
j
Fuse
Power supply 3N~ 50 Hz
Power supply 1~ 50 Hz
Earth wiring
15.3
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).
15.4
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
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)
