– 68 –
Simultaneous triple and double twin system
* Use 2-core shield wire (MVVS 0.5 to 2.0 mm
2
or more) for the remote controller wiring in the simultaneous twin,
simultaneous triple and simultaneous double twin systems to prevent noise problems. Be sure to connect both
ends of the shield wire to earth leads.
* Connect earth wires for each indoor unit in the simultaneous twin, simultaneous triple and simultaneous double
twin systems.
Stripping length power cord and
connecting wire
A
B
1
2
3
A
B
1
2
3
A
B
1
2
3
A
B
1
2
3
1
L1 L2
N
L3
2
3
Remote controller
Remote controller wiring
Indoor side
Indoor/Outdoor
connecting wires
Outdoor side
Power supply
Indoor side
Remote
controller inter-
unit wiring
Triple
Double twin
Indoor power inter-
unit wiring
Indoor power inter-
unit wiring
Indoor power inter-
unit wiring
Indoor side
Indoor side
Remote
controller inter-
unit wiring
Remote
controller inter-
unit wiring
1
2
3
L1
L2
L3
N
Cord clamp
Earth
screw
Indoor/outdoor
connecting wire
Power supply wire
Cord clamp
Earth
screw
10
30
50
1
10
2 3
10
40
50
10
L1 L2 L3 N
Earth line
Connecting wire
(mm)
Power supply
wire
Earth line
(mm)
8
Earthing
WARNING
Be sure to connect the earth wire. (Grounding work)
Incomplete earthing may cause an electric shock.
Connect the earth wire properly following applicable technical standards.
Connecting the earth wire is essential to preventing electric shock and to reducing noise and electrical charges on
the outdoor unit surface due to the high-frequency wave generated by the frequency converter (inverter) in the
outdoor unit.
If you touch the charged outdoor unit without an earth wire, you may experience an electric shock.
9
Finishing
After the refrigerant pipe, inter-unit wires, and drain pipe have been connected, cover them with finishing tape and
clamp them to the wall with off-the-shelf support brackets or their equivalent.
Keep the power wires and system interconnection wires off the valve on the gas side or pipes that have no heat
insulator.
10
Test run
• Turn on the circuit breaker at least 12 hours before starting a test run to protect the compressor during
startup.
To protect the compressor, power is supplied from the 380-415 VAC input to the unit to preheat the compressor.
• Check the following before starting a test run:
• That all pipes are connected securely without leaks.
• That the valve is open.
If the compressor is operated with the valve closed, the outdoor unit will become overpressurized, which may
damage the compressor or other components.
If there is a leak at a connection, air can be sucked in and the internal pressure further increases, which may
cause a burst or injury.
• Operate the air conditioner in the correct procedure as specified in the Owner’s Manual.
11
Annual maintenance
For an air conditioning system that is operated on a regular basis, cleaning and maintenance of the indoor / outdoor
units are strongly recommended.
As a general rule, if an indoor unit is operated for about 8 hours daily, the indoor / outdoor units will need to be
cleaned at least once every 3 months. This cleaning and maintenance should be carried out by a qualified service
person.
Failure to clean the indoor / outdoor units regularly will result in poor performance, icing, water leaking and even
compressor failure.
135-EN
136-EN
