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9. 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. Separate 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 any of the control circuit cables (remote controller,
transmission cables) from being brought in direct contact with the power cable
outside the unit.
4. Ensure that there is no slack on all wire connections.
5. Some cables (power, remote controller, transmission cables) above the ceiling
may be bitten by mice. Use as many metal pipes as possible and insert the
cables into them for protection.
<Table 1>
System configuration
Transmission cable length
Facility example
Residence or independent store
(for noise judgment)
without noise
VCTF, VCTFK, CVV, CVS, VVR,
Types of transmission
VVF, VCT or shielding wire
cables
CVVS or CPEVS
Length
2. Remote controller cables
Types of cables
2-core cable (unshielded)
Cable diameter
0.3 to 1.25 mm
Length
Less than 200 m
9.1. 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 contact separation in each pole shall be provided
by the Air conditioner installation.
Power cable size: more than 1.5 mm
[Fig. 9.1.1] (P.3)
A Switch 16 A
C Indoor unit
E Pull box
[Selecting non-fuse breaker (NF) or earth leakage breaker (NV)]
To select NF or NV instead of a combination of Class B fuse with switch, use the
following:
•
In the case of Class B fuse rated 15 A or 20 A,
NF model name (MITSUBISHI): NF30-CS (15 A) (20 A)
NV model name (MITSUBISHI): NV30-CA (15 A) (20 A)
Use an earth leakage breaker with a sensitivity of less than 30 mA 0.1 sec.
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 mal-
function or fire.
9.2. 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.
8
For a single-refrigerant system
Less than 120 m
Building, clinic, hospital or communications
station without noise supposedly generated
from inverter equipment, private power gen-
erator, high-frequency medical equipment,
radio-used communications equipment and
so on
Less than 120 m
MA remote controller
2
2
B Overcurrent protection 16 A
D Total operating current be less than 16 A
6. Never connect the power cable to leads for the transmission cables. Otherwise
the cables would be broken.
7. Be sure to connect control cables to the indoor unit, remote controller, and the
outdoor unit.
8. Earth the unit on the outdoor unit side.
9. Select control cables from the conditions given in page 8 .
Caution:
Earth the unit on the outdoor unit side. Do not connect the earth cable to any
gas pipe, water pipe, lightening rod, or telephone earth cable. Incomplete
grounding may cause a risk of electric shock.
Types of control cables
1. Wiring transmission cables
•
Cable diameter
More than 1.25 mm
2
More than 120 m
Shielding wire CVVS or CPEVS
M-NET remote controller
Non-shielding wire for up to 10 m; the same specifications as "1." Wiring
transmission cables for more than 10 m
0.3 to 1.25 mm
2
Add any portion in excess of 10 m to within the longest allowable trans-
mission cable length 200 m (Shielding portion is more than 1.25 mm
•
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)
•
Connect the remote controller's transmission cable within 10 m using a 0.75 mm
core cable. If the distance is more than 10 m, use a 1.25 mm
[Fig. 9.2.1] (P.3) MA Remote controller
[Fig. 9.2.2] (P.3) M-NET Remote controller
A Terminal block for indoor transmission cable
B Terminal block for outdoor transmission cable
C Remote controller
•
DC 9 to 13 V between 1 and 2 (MA remote controller)
•
DC 24 to 30 V between M1 and M2 (M-NET remote controller)
9.3. Connecting electrical connections
Verify that the model name on the operating instructions on the cover of the control
box is the same as the model name on the nameplate.
Step 1
Remove the screws holding the terminal box cover in place.
Step 2
Install the electrical cables, transmission wiring, and remote controller wiring.
[Fig. 9.3.1] (P.3) MA Remote controller
[Fig. 9.3.2] (P.3) M-NET Remote controller
A Non-polarized
C Remote Controller
•
The MA remote controller and the M-NET remote controller cannot be used at
the same time or interchangeably.
Step 3
After installing the wiring, check that no wires are loose or installed incorrectly, and
fit the terminal box cover in the reverse order to removing the control box cover.
For a multi-refrigerant system
Regardless of length
All facilities
Less than 200 m
2
)
2
junction cable.
B Upper level (TB15)
D Lower level (TB5)
2
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