Mitsubishi Electric CITY MULTI PEFY-P125VMHS-E-F Manuel D'installation page 11

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 air inlet
and air outlet duct flanges, and air outlet ducts.
9. Electrical wiring
Precautions on electrical wiring
Warning:
Electrical work should be done by qualified electrical engineers in accordance
with "Engineering Standards For Electrical Installation" and supplied installa-
tion manuals. Special circuits should also be used. If the power circuit lacks ca-
pacity or has an installation failure, it may cause a risk of electric 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 controller,
transmission cables) is brought in direct contact with the power cable outside 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.
Transmission cable specifications
Type of cable Shielding wire (2-core) CVVS, CPEVS or MVVS
Cable diameter
Maximum length of transmission lines for centralized control and indoor/
outdoor transmission lines (Maximum length via indoor units): 500 m MAX
Remarks
The maximum length of the wiring between power supply unit for
transmission lines (on the transmission lines for centralized control) and
each outdoor unit and system controller is 200 m.
*1 Connected with simple remote controller.
9.1. Power supply wiring
• Use dedicated power supplies for the outdoor unit and indoor unit.
• Bear in mind ambient conditions (ambient temperature, direct sunlight, rain water, etc.) when proceeding with the wiring and connections.
• The wire size is the minimum value for metal conduit wiring. If the voltage drops, use a wire that is one rank thicker in diameter. Make sure the power-supply voltage does
not drop more than 10%.
• Specific wiring requirements should adhere to the wiring regulations of the region.
• Power supply cords of appliances shall not be lighter than design 245 IEC 57, 227 IEC 57, 245 IEC 53 or 227 IEC 53.
• A switch with at least 3 mm contact separation in each pole shall be provided by the Air conditioner installation.
[Fig. 9.1.1] (P.4)
A Ground-fault interrupter
B Local switch/Wiring breaker
C Indoor unit
D Pull box
Minimum wire thickness (mm
Total operating current of
the Indoor unit
Main cable
*2
F0 = 16 A or less 1.5
*2
F0 = 25 A or less 2.5
*2
F0 = 32 A or less 4.0
Apply to IEC61000-3-3 about Max. Permissive System Impedance.
Transmission cables
2
More than 1.25 mm
Max length: 200 m
2
)
Ground-fault interrupter
Branch Ground
1.5 1.5 20 A current sensitivity
2.5 2.5 30 A current sensitivity
4.0 4.0 40 A current sensitivity
[Fig. 8.0.1] (P.4)
A Air inlet
C Access door
E Duct (Arrange on site)
G Keep duct-work length 850 mm or more
H Insulator (Arrange on site)
Caution:
Inlet duct is 850 mm or more necessary to construct.
Always install horizontal.
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 tele-
phone earth cable. Incomplete grounding may cause a risk of electric
shock.
• If the supply cord is damaged, it must be replaced by the manufacturer, its
service agent or similarly qualified persons in order to avoid a hazard.
ME Remote controller cables
Sheathed 2-core cable (unshielded) CVV
2
0.3 ~ 1.25 mm
2
(0.75 ~ 1.25 mm
When 10 m is exceeded, use
cables with the same specification
as transmission cables.
CVVS, MVVS: PVC insulated PVC jacketed shielded control cable
CPEVS: PE insulated PVC jacketed shielded communication cable
CVV: PVC insulated PVC sheathed control cable
Local switch (A)
*1
Capacity Fuse
*3
16 16
*3
25 25
*3
32 32
B Air outlet
D Ceiling
F Canvas duct (Arrange on site)
I Hood (Arrange on site)
MA Remote controller cables
2
0.3 ~ 1.25 mm
2
)*1 (0.75 ~ 1.25 mm )*1
Max length: 200 m
Breaker for wiring (A)
(Non-fuse breaker)
20
30
40
11