Electrical Wiring; Power Supply Wiring - Mitsubishi Electric CITY MULTI PFFY-WP-VLRMM-E Série Manuel D'installation

7. Electrical wiring

Precautions on electrical wiring
Warning:
Electrical work should be done by qualifi ed electrical engineers in accord-
ance 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 fi re.
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 con-
troller, 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 ceil-
ing may be bitten by mouses. Use as many metal pipes as possible to insert
the cables into them for protection.
Transmission cable specifi cations
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.

7.1. Power supply wiring

• Use dedicated power supplies for the 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%.
• Specifi c wiring requirements should adhere to the wiring regulations of the region.
• Power supply cords of appliances shall not be lighter than design 60245 IEC 57, 60227 IEC 57, 60245 IEC 53 or 60227 IEC 53.
• A switch with at least 3 mm contact separation in each pole shall be provided by the Air conditioner installation.
[Fig. 7.1.1] (P.3)
A Ground-fault interrupter
B Local switch/Wiring breaker
C Indoor unit
D Pull box
Total operating current of the
Indoor unit
Main cable
*2
F0 = 16 A or less
*2
F0 = 25 A or less
*2
F0 = 32 A or less
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 Type1)/C} + {V1 × (Quantity of Type2)/C}
Indoor unit
Type1 PEFY-VMS, PFFY-VLRMM
Type2 PEFY-VMA
C : Multiple of tripping current at tripping time 0.01s
Please pick up "C" from the tripping characteristic of the breaker.
<Example of "F2" calculation>
*Condition PEFY-VMS × 4 + PEFY-VMA × 1, C = 8 (refer to right sample chart)
F2 = 18.6 × 4/8 + 38 × 1/8
= 14.05
 16 A breaker (Tripping current = 8 × 16 A at 0.01s)
*3 Current sensitivity is calculated using the following formula.
G1 = (V2 × Quantity of Type1) + (V3 × Wire length [km])
G1 Current sensitivity
30 or less 30 mA 0.1 sec or less
100 or less 100 mA 0.1 sec or less
Transmission cables
Shielding wire (2-core)
CVVS, CPEVS or MVVS
2
More than 1.25 mm
Max length: 200 m
2
Minimum wire thickness (mm )
Branch Ground
1.5 1.5 1.5
2.5 2.5 2.5
4.0 4.0 4.0
Wire thickness
5. Never connect the power cable to leads for the transmission cables. Other-
wise 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 9.
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 elec-
tric shock.
• If the supply cord is damaged, it must be replaced by the manufacturer,
its service agent or similarly qualifi ed persons in order to avoid a haz-
ard.
ME Remote controller cables
Sheathed 2-core cable (unshielded) CVV
0.3 ~ 1.25 mm
(0.75 ~ 1.25 mm
When 10 m is exceeded, use
cables with the same specifi cation
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
Ground-fault interrupter
Capacity
*3
20 A current sensitivity 16
*3
30 A current sensitivity 25
*3
40 A current sensitivity 32
V1 V2
18.6 2.4
38 1.6
V3
2
1.5 mm 48
2
2.5 mm 56
2
4.0 mm 66
MA Remote controller cables
2
0.3 ~ 1.25 mm
2 *1
) (0.75 ~ 1.25 mm
Max length: 200 m
Breaker for wiring (A)
(Non-fuse breaker)
Fuse
16 20
25 30
32 40
SAMPLE
Rated Tripping current (x)
Sample chart
2
2 *1
)
9