Electrical Wiring; Power Supply Wiring - Mitsubishi Electric CITY MULTI PEFY-P06NMAU-E4 Manuel D'installation

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
installation manuals. Special circuits should also be used. If the power circuit
lacks capacity 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 mice. Use as many metal pipes as possible to insert the cables
into them for protection.
Transmission cable specifications
Type of
cable
Cable
diameter
Maximum length of transmission lines for centralized control and indoor/outdoor
transmission lines (Maximum length via indoor units): 500 m [1640 ft] 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 [656 ft].
*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.
• Wiring size must comply with the applicable local and national codes.
•
Use copper supply wires.
Use UL wires rated 300 V or more for the power supply cords.
• Install a ground wire longer than other cables.
• To ensure all-pole-disconnection from the main power supply, make sure to provide a disconnection incorporated in the fixed wiring routed to the unit during installation.
[Fig. 9.1.1] (P.5)
Ground-fault interrupter
A
Local switch/Wiring breaker
B
Indoor unit
C
Pull box
D
Total operating current of the Indoor unit
F0 = 15 A or less *
2
F0 = 20 A or less *
2
F0 = 30 A or less *
2
Apply to IEC61000-3-3 about Max. Permissive System Impedance.
*1 The Ground-fault interrupter should support Inverter circuit.
The Ground-fault interrupter should combine using of local switch or wiring breaker.
*2 Please take the larger of F1 or F2 as the value for F0.
F1 = Total operating maximum current of the indoor units × 1.2
F2 = {V1 × (Quantity of indoor unit 1)/C} + {V1 × (Quantity of indoor unit 2)/C} + {V1 × (Quantity of indoor unit 3)/C} +...
Indoor unit
PEFY-P·NMAU-E4
Transmission cables
Shielding wire (2-core)
CVVS, CPEVS or MVVS
Use UL wire rated 300 V.
More than 1.25 mm [AWG 16]
2
Max length: 200 m [656 ft]
Minimum wire thickness (mm
Main cable Branch Ground
2.1/14 2.1/14 2.1/14
3.3/12 3.3/12 3.3/12
5.3/10 5.3/10 5.3/10
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 13.
9. Perform wiring in compliance with the safety regulations detailed in
UL60335-2-40.
Caution:
• Be sure to put the unit to the ground 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.
• 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 (CVV, shielded
CVVS, CPEVS or MVVS)
Use UL wire rated 300 V.
0.3 – 1.25 mm [AWG 22 – 16]
2
(0.75 – 1.25 mm [AWG 18 –16])*
2
When 10 m [32 ft] 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
/AWG)
2
Breaker for wiring (NFB)
Capacity Fuse
15 15
20 20
30 30
V1 V2
18.6 3.0
MA Remote controller cables
Sheathed 2-core cable
Use UL wire rated 300 V.
0.3 – 1.25 mm [AWG 22 – 16]
2
(0.75 – 1.25 mm [AWG 18 –16])*
1 2
Max length: 200 m [656 ft]
Ground-fault interrupter *
15 15 A current sensitivity *
20 20 A current sensitivity *
30 30 A current sensitivity *
1
1
3
3
3
13