Installation and operation manual
7
Electric wiring work
General instructions
■
Be sure to use a dedicated power supply. Never use a power
supply shared by another appliance.
■
All field supplied parts and materials and electric works must be
conform to local and national regulations.
■
All wiring must be performed by an authorized electrician.
■
Use copper wire only.
■
Follow the "Wiring diagram" attached to the unit to wire the
outdoor unit, indoor units and the remote controller. For details
how to mount the remote controller, refer to the "Installation
manual of the remote controller".
■
Attach the earth leakage circuit breaker and fuse to the power
supply line.
■
A main switch or other means for disconnection, having a
contact separation in all poles, must be incorporated in the fixed
wiring in accordance with relevant local and national legislation.
Note that the operation will restart automatically if the main
power supply is turned off and then turned back on again.
■
This system consists of multiple indoor units. Mark each indoor
unit as unit A, unit B..., and be sure the terminal block wiring to
the outdoor unit and BS unit are properly matched. If wiring and
piping between the outdoor unit and an indoor unit are
mismatched, the system may cause a malfunction.
■
Be sure to ground the air conditioner.
■
Do not connect the ground wire to:
- gas pipes: might cause explosions or fire if gas leaks.
- telephone ground wires or lightning rods: might cause
abnormally high electric potential in the ground during
lightning storms.
- plumbing pipes: no grounding effect if hard vinyl piping is
used.
■
Make sure electrical wires are stripped
equally.
■
Use an all-pole disconnection type breaker
with at least 3mm between the contact point
gaps.
■
If the supply cord is damaged, it must be replaced by the
manufacturer, a service agent or similarly qualified persons in
order to avoid a hazard.
Precautions
1
Observe the notes mentioned below when wiring to the power
supply terminal board.
- Use a round crimp-style terminal for insulation sleeve for
connection to the terminal block for wiring the units. When
none are available, follow the instructions below.
- 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 dimension, connect
them according to the figure.
Use the specified electric wire. Connect the wire securely to the
terminal. Lock the wire down without applying excessive force to
the terminal. Use torques according to the table below.
- When attaching the control box lid, make sure not to pinch
any wires and make sure that the wiring does not come in
contact with the piping and sharp edges.
- After all wiring connections are done, fill in any gaps in the
casing wiring holes with putty or insulation material (field
supply) thus to prevent small animals or dirt from entering the
unit from outside and causing short circuits in the control box.
2
Keep total current of crossover wiring between indoor units less
than 12 A. Branch the line outside the terminal board of the unit
in accordance with electrical equipment standards, when using
two power wiring greater than 2 mm
2
(Ø1.6).
The branch must be sheathed in order to provide an equal or
greater degree of insulation as power supply wiring itself.
3
Do not connect wires of different dimensions to the same
grounding terminal. Looseness in the connection may
deteriorate the protection.
4
Remote controller cords and wires connecting the units should
be located at least 50 mm away from power supply wiring. Not
following this guideline may result in malfunction due to
electrical noise.
5
For the remote controller wiring, refer to the "Installation manual
of the remote controller" supplied with the remote controller.
6
Use only specified wires and tightly connect wires to the
terminals. Be careful that wires do not place external stress on
the terminals. Keep wiring in neat order so that they do not
obstruct other equipment such as popping open the control box
cover. Make sure the cover closes tight. Incomplete connections
could result in overheating, and in the worse case, electric shock
or fire.
7
Fasten wiring with clamps (accessory part).
DANGER: ELECTRICAL SHOCK
Switch off all power supply before removing the switch box
service panel or before making any connections or
touching electrical parts.
To avoid electric shock, be 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, be sure that those voltages are
50 V DC or less.
When service panels are removed, live parts can be easily
touched by accident.
Never leave the unit unattended during installation or
servicing when service panel is removed.
Terminal
Size
Tightening
torque (N•m)
Terminal block for remote controller
M3.5
0.79~0.97
Power supply terminal block
M4
1.18~1.44
Ground terminal
M4
1.44~1.94
1
2
3
1
Round crimp-style terminal
2
Attach insulation sleeve
3
Wiring
01_4PEN323720-1E.book Page 7 Tuesday, October 3, 2017 4:34 PM
