Filter
Top Products
10
GBDFEINLPGRRUTR
CZSVHGPO
9. 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 install an earth leakage breaker to the power.
2. 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.
3. Ensure that there is no slack on all wire connections.
4. Some cables (power, remote controller, transmission cables) above the ceiling
may be bitten by mouses. Use as many metal pipes as possible to insert the
cables into them for protection.
5. Never connect the power cable to leads for the transmission cables. Otherwise
the cables would be broken.
6. Be sure to connect control cables to the indoor unit, remote controller, and the
outdoor unit.
7. Put the unit to the ground on the outdoor unit side.
8. Select control cables from the conditions given in page
11
.
Caution:
Be sure to put the unit to the ground on the outdoor unit side. Do not con-
nect 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
•Types of transmission cables
Design wiring in accordance with the following table <Table 1>.
• Cable diameter
More than 1.25 mm
2
8. Duct work
• When connecting ducts, insert a canvas duct between the main body and the
duct.
• Use non-combustible duct components.
• Install sufficient thermal insulation to prevent condensation forming on outlet
duct flanges and outlet ducts.
Caution:
•Keep the distance between the inlet grille and the fan over 850 mm.
If it is less than 850 mm, install a safety guard not to touch the fan.
[Fig. 8.0.1] (P.4)
A Air inlet B Air filter (supplied at site)
C Duct D Canvas duct
E Access door F Ceiling
G Ensure sufficient length to prevent short cycling
H Air outlet I Keep duct-work length 850 mm or more
<Table 1>
Transmission cable length Less than 80 m
Facility example
(for noise judgment)
Types of transmission
cables
Residence or independent store
without noise
VCTF, VCTFK, CVV, CVS, VVR,
VVF, VCT or shielding wire
CVVS or CPEVS
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
Shielding wire CVVS or CPEVS
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.
• Connect the “1” and “2” on indoor unit TB15 to a MA remote controller. (Non-
polarized 2-wire)
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 2.0 mm
2
[Fig. 9.1.1] (P.4)
A Switch 16 A B Overcurrent protection 16 A
C Indoor unit
[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 s.
2. Remote controller cables
Types of cables
Cable diameter
Length
MA remote controller
Sheathed 2-core cable (unshielded) CVV
0.3 to 1.25 mm
2
Less than 200 m
WT05750X01_GB.p65 09/10/19, 16:3010