Installation manual
9
REQ71+10 REQ71~125B7W1B
Split System air conditioners
4PW19495-1B
E
LECTRICAL
WIRING
WORK
Precautions on electrical wiring work
■
Before obtaining access to terminal devices, all supply circuits
must be interrupted.
■
Use only copper wires.
■
The wiring between the indoor unit and outdoor unit must be for
230 V.
■
Do not turn on the main switch until all the wiring is completed.
Make sure that the main switch has a contact separation of at
least 3 mm in all poles.
■
For W1
Make sure to connect power supply cables in normal phase. If
connected in reverse phase, the remote controller of the indoor
unit indicates "U1" and the equipment cannot operate. Change
any two of the three power supply cables (L1, L2, L3) to correct
phase.
If the contact in the magnetic switch should be forcibly turned on
while the equipment is inoperative, the compressor will burn out.
Never try to forcibly turn on the contact.
■
Never squeeze bundled cables into a unit.
■
Fix cables so that cables do not make contact with the pipes
(especially on high pressure side).
■
Secure the electrical wiring with clamping material as shown in
so that it does not come in contact with the piping,
particulary on the high-pressure side.
Make sure no external pressure is applied to the terminal
connectors.
Secure the wiring in the order shown below.
1
Secure the ground wire to the shut-off valve attachment plate so
that it does not slide.
2
Secure the ground wire to the shut-off valve attachment plate
one more time along with the electric wiring and the inter-unit
wiring.
■
Lay the electrical wiring so that the front cover does not rise up
when doing wiring work and attach the front cover securely.
A
V3-type
B
W1-type
1
Switch box
2
Stop valve mounting plate
3
Ground
4
Power supply and ground wiring
5
Wiring between units
6
Tie-wrap
■
When cables are routed from the unit, a protection sleeve for the
conduits (PG-insertions) can be inserted at the knock-out hole.
A
Inside
B
Outside
1
Wire
2
Bush
3
Nut
4
Frame
5
Hose
When you do not use a wire conduit, be sure to protect the wires
with vinyl tubes to prevent the edge of the knock-out hole from
cutting the wires.
■
Follow the electric wiring diagram for electrical wiring works.
■
Form the wires and fix the cover firmly so that the cover may be
fit in properly.
Precautions on wiring of power supply and inter-unit
wiring
■
Use a round crimp-style terminal for
connection to the power supply
terminal board. In case it cannot be
used due to unavoidable reasons,
be sure to observe the following
instruction.
-
Do not connect wires of different gauge to the same power
supply terminal. (Looseness in the connection may cause
overheating.)
-
When connecting wires of the same gauge, connect them
according to the figure below.
■
Use the correct screwdriver to tighten the terminal screws.
Small screwdrivers can damage the screw head and prevent
appropriate tightening.
■
Over-tightening the terminal screws can damage the screws.
■
See the table below for tightening torques for the terminal
screws.
■
Refer to the installation manual attached to the indoor unit for
wiring of indoor units, etc.
■
Attach an earth leakage breaker and fuse to the power supply
line.
■
In wiring, make certain that prescribed wires are used, carry out
complete connections, and fix the wires so that outside forces
are not applied to the terminals.
■
All wiring must be performed by an authorized
electrician.
■
All components procured on the site and all electric
construction should comply with the applicable local
and national codes.
■
High voltage
To avoid electrical shock, make sure to disconnect the
power supply 1 minute or more before servicing the
electrical parts. Even after 1 minute, always measure
the voltage at the terminals of main circuit capacitors
or electrical parts and, before touching, make sure
that those voltages are 50 V DC or less.
NOTE
To persons in charge of electrical wiring work:
Do not operate the unit until the refrigerant piping is
complete. (Running it before the piping is ready will break
the compressor.)
Tightening torque (N•m)
M4
(X1M)
1.2~1.8
M5
(X1M)
2.0~3.0
M5
(EARTH)
3.0~4.0
1
Earth leakage breaker
2
Fuse
3
Remote controller
