Electrical Wiring; Power Supply Wiring - Mitsubishi Electric PEFY-P20VMA-E Installation Manual

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. Other-
wise the cables would be broken.
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 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

• 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.
[Fig. 9.1.1] (P.4)
A Ground-fault interrupter
B Local switch/Wiring breaker
C Indoor unit
Ground-fault interrupter
*1, *2
Indoor unit 15 A 30 mA 0.1sec. or less
*1 The Ground-fault interrupter should support Inverter circuit. (e.g. Mitsubishi Electric's NV-C series or equivalent).
*2 Ground-fault interrupter should combine using of local switch or wiring breaker.
*3 It shows data for B-type fuse of the breaker for current leakage.
[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.
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.
Transmission cables
Shielding wire (2-core)
CVVS, CPEVS or MVVS
2
More than 1.25 mm
Max length: 200 m
Local switch
Breaker capacity
<A>
16
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
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 (unshielded) CVV
0.3 ~ 1.25 mm 2
2
(0.75 ~ 1.25 mm
When 10 m is exceeded, use
cables with the same specifica-
tion 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
Wiring breaker
Over-current protector*3 (Non-fuse breaker)
<A> <A>
16 16
MA Remote controller cables
0.3 ~ 1.25 mm
2
)*1 (0.75 ~ 1.25 mm
Max length: 200 m
Minimum Wire thickness
Power wire Earth wire
<mm 2 > <mm
2
2
)*1
2 >
2
11