7 Electrical installation
Installation manual
12
4MWXM-A9
R32 Split series
3P600450-7T – 2022.09
WARNING
ALWAYS use multicore cable for power supply cables.
WARNING
Use an all-pole disconnection type breaker with at least
3 mm between the contact point gaps that provides full
disconnection under overvoltage category III.
WARNING
If the supply cord is damaged, it MUST be replaced by the
manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
WARNING
Do NOT connect the power supply to the indoor unit. This
could result in electrical shock or fire.
WARNING
▪ Do NOT use locally purchased electrical parts inside
the product.
▪ Do NOT branch the power supply for the drain pump,
etc. from the terminal block. This could result in
electrical shock or fire.
WARNING
Keep the interconnection wiring away from copper pipes
without thermal insulation as such pipes will be very hot.
DANGER: RISK OF ELECTROCUTION
All electrical parts (including thermistors) are powered by
the power supply. Do NOT touch them with bare hands.
DANGER: RISK OF ELECTROCUTION
Disconnect the power supply for more than 10 minutes,
and measure the voltage at the terminals of main circuit
capacitors or electrical components before servicing. The
voltage MUST be less than 50 V DC before you can touch
electrical components. For the location of the terminals,
see the wiring diagram.
MR30_A
S80
S70
D
C-
FU2
AL1
DP2
DP1
AL2
S60
S
S50
MR30_B
S20
S21
S22
S23
S93
S92
S90
W
V
U
S40
AC
DC
DC
c
e
d
f
b
a
l
k
j
i
g
h
DC(-)
FU2
a
AL1, AL2, DP1, DP2: solenoid valve lead wire connectors
b
S: terminal strip lead wire connector
c
S20~S22 (room A, B, C) + S23 (TO TANK): electronic
expansion valve coil lead wire connector,
d
MR30_A, MR30_B - suspend lead wire connectors
e
S40: thermal overload relay lead wire and high pressure
switch connector
f
Multimeter (DC voltage range)
g
S90, S92, S93: thermistor lead wire connector
h
S50: suspend lead wire connector
i
S60: pressure sensor connector
j
S70: fan motor lead wire connector
k
S80: 4-way valve lead wire connector
l
W, V, U: Compressor lead wire connector
7.1
Specifications of standard wiring
components
NOTICE
We recommend using solid (single-core) wires. If stranded
wires are used, twist the conductor to consolidate the end
or twist the conductor to consolidate the end in
combination with the usage of a round crimp-style terminal
on the end of the conductor. Details are described in
"Guidelines when connecting the electrical wiring" in the
installer reference guide.
Component
Power supply
cable
Voltage
220~240 V
Current
16.3 A
Phase
1~
Frequency
50 Hz
Wire size
MUST comply with national
wiring regulation
3-core cable
Wire size based on the
current, but not less than
2.5 mm
2
Interconnection
cable
(indoor↔outdoor)
Voltage
220~240 V
Wire size
Only use harmonised wire
providing double insulation
and suitable for applicable
voltage
4-core cable
Minimum 1.5 mm
2
Recomended circuit breaker
20 A
Earth leakage circuit breaker /
residual current circuit breaker
MUST comply with national
wiring regulation
Electrical equipment must comply with EN/IEC 61000-3-12, the
European/International Technical Standard setting the limits for
harmonic currents produced by equipment connected to public low-
voltage systems with input current >16 A and ≤75 A per phase.
7.2
To connect the electrical wiring to
the outdoor unit
1
Remove the switch box cover (1 screw).
1
2
1×
2
Connect the wires between the indoor and outdoor units so that
the terminal numbers match. Make sure to match the symbols
for piping and wiring.
3
Make sure to connect correct wiring to correct room.
