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10.Electrical wiring
Precautions on electrical wiring
Warning:
Electrical work should be done by qualified electrical engineers in accord-
ance with "Engineering Standards For Electrical Installation" and supplied
installation manuals. Special circuits should also be used. If the power cir-
cuit lacks capacity or has an installation failure, it may cause a risk of elec-
tric shock or fire.
1. Be sure to take power from the special branch circuit.
2. Be sure to install an earth leakage breaker to the power.
3. Install the unit to prevent that any of the control circuit cables (remote control-
ler, transmission cables) is brought in direct contact with the power cable out-
side the unit.
4. Ensure that there is no slack on all wire connections.
5. Some cables (power, remote controller, transmission cables) above the ceil-
ing may be bitten by mouses. Use as many metal pipes as possible to insert
the cables into them for protection.
6. Never connect the power cable to leads for the transmission cables. Other-
wise the units would be broken.
7. Be sure to connect control cables to the indoor unit, remote controller, and
the outdoor unit.
8. Select control cables from the conditions given in page 10.
Caution:
Be sure to ground the indoor unit. Do not connect the grounding cable to
any gas pipe, water pipe, lightening rod, or telephone earth cable. Incom-
plete grounding may cause a risk of electric shock.
Types of control cables
1. Wiring transmission cables
•
Types of transmission cables: Shielding wire CVVS or CPEVS
•
Cable diameter: More than 1.25 mm
•
Maximum wiring length: Within 200 m [656ft]
•
Maximum length of transmission lines for centralized control and indoor/out-
door transmission lines (Maximum length via indoor units): 500 m [1640ft]
MAX
The maximum length of the wiring between power supply unit for transmis-
sion lines (on the transmission lines for centralized control) and each outdoor
unit and system controller is 200 m [656ftt]
2. Remote control cables
•
M-NET Remote Controller
Kind of remote control cable
Sheathed 2-core cable (unshielded)
0.3 to 1.25 mm
Cable diameter
(0.75 to 1.25 mm
When 10 m [32ft] is exceeded, use cable with
Remarks
the same specifications as 1. Wiring transmis-
sion cables.
•
MA Remote Controller
Kind of remote control cable
Sheathed 2-core cable (unshielded) CVV
0.3 to 1.25 mm
Cable diameter
(0.75 to 1.25 mm
Remarks
Within 200 m [656ft]
* Connected with simple remote controller.
10.1. Power supply wiring
•
Power supply cords of appliances shall not be lighter than design 245 IEC 57
or 227 IEC 57.
•
A switch with at least 3 mm [1/8 in] contact separation in each pole shall be
provided by the Air conditioner installation.
Wire size for Main Power Supply and On/Off Capacities.
2
•
Minimum Wire size (mm
/ AWG)
•
Switch (A)
•
Breaker for Wiring (NFB)
•
Breaker for Current Leakage
[Fig. 10.1.1] (P.4)
Switch 15 A (Breakers for Current Leakage)
Switch 15 A (Breakers for Wiring or Main Switch)
Indoor unit
Total operating current be less than 15 A
Pull box
10
2
[AWG16]
2
[AWG22 to 16]
2
[AWG18 to 16])*
2
[AWG22 to 16]
2
[AWG18 to 16])*
Main Cable : 0.41/22
Branch :
0.41/22
Ground :
0.41/22
Capacity : 15 Fuse : 15
: 15 A
: 20 A 30 mA 0.1 sec.or less
Caution:
Do not use anything other than the correct capacity breaker and fuse.
Using fuse, wire or copper wire with too large capacity may cause a risk of
malfunction or fire.
10.2. Connecting remote controller, indoor
and outdoor transmission cables
•
Connect indoor unit TB5 and outdoor unit TB3. (Non-polarized 2-wire)
The "S" on indoor unit TB5 is a shielding wire connection. For specifications
about the connecting cables, refer to the outdoor unit installation manual.
•
Install a remote controller following the manual supplied with the remote con-
troller.
•
Connect the "1" and "2" on indoor unit TB15 to a MA remote controller. (Non-
polarized 2-wire)
•
Connect the "M1" and "M2" on indoor unit TB5 to a M-NET remote controller.
(Non-polarized 2-wire)
[Fig. 10.2.1] (P.4) MA Remote controller
[Fig. 10.2.2] (P.4) M-NET Remote controller
Terminal block for indoor transmission cable
Terminal block for outdoor transmission cable
MA Remote controller
M-NET Remote controller
•
DC 10 to 13 V between 1 and 2 (MA remote controller)
•
DC 24 to 30 V between M1 and M2 (M-NET remote controller)
[Fig. 10.2.3] (P.4) MA Remote controller
[Fig. 10.2.4] (P.4) M-NET Remote controller
Non-polarized
MA Remote Controller
M-NET Remote controller
•
The MA remote controller and the M-NET remote controller cannot be used
at the same time or interchangeably.
Caution:
Install wiring so that it is not tight and under tension. Wiring under tension
may break, or overheat and burn.
•
Fix power source wiring to control box by using buffer bushing for tensile
force. (PG connection or the like.) Connect transmission wiring to transmis-
sion terminal block through the knockout hole of control box using ordinary
bushing.
•
After wiring is complete, make sure again that there is no slack on the con-
nections, and attach the cover onto the control box in the reverse order
removal.
Caution:
Wire the power supply so that no tension is imparted. Otherwise discon-
nection, heating or fire result.
10.3. Connecting electrical connections
Please identify the model name of the operation manual attached on the terminal
bed box cover with that shown on the rating name plate.
1.Remove the screw (2pcs) holding the cover to dismount the cover.
[Fig. 10.3.1] (P.5)
Screw holding cover (2pcs)
2. Open knockout holes
(Recommend to use a screwdriver or the like for this work.)
[Fig. 10.3.2] (P.5)
Terminal bed box
Remove
3. Fix power source wiring to terminal bed box by using buffer bushing for ten-
sile force. (PG connection or the like.) Connect transmission wiring to trans-
mission terminal bed through the knockout hole of terminal bed box using
ordinary bushing.
[Fig. 10.3.3] (P.5)
To prevent external tensile force from applying to the wiring connection section
of power source terminal bed use buffer bushing like PG connection or the like.
Power source wiring
Use ordinary bushing
4. Connect the power source, transmission and remote controller wiring. The
dismounting of the terminal bed box is not needed.
[Fig. 10.3.4] (P.5)
Power source terminal bed
To 1-phase power source
Terminal bed for outdoor transmission line (TB3)
Transmission line to the remote controller, terminal bed for indoor unit and BC
controller
Upper stage (TB15)
Lower stage (TB5)
Cover
Knockout hole
Knockout hole
Tensile force
Transmission wiring
Terminal bed for indoor transmission
Transmission line DC 30 V
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