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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 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 mouses. 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 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, 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.5)
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
F0 = 16 A or less *
1.5
2
F0 = 25 A or less *
2.5
2
F0 = 32 A or less *
4.0
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 curent of the indoor units × 1.2
F2 = {V1 × (Quantity of Type1)/C} + {V1 × (Quantity of Type2)/C} + {V1 × (Quantity of Type3)/C} + {V1 × (Quantity of Others)/C}
Indoor unit
V1
PEFY-NMAU
38
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-NMAU × 3, C = 8 (refer to right sample chart)
F2 = 38 × 3/8
= 14.25
➞ 16 A breaker (Tripping current = 8 × 16 A at 0.01s)
12
Transmission cables
Shielding wire (2-core)
CVVS, CPEVS or MVVS
More than 1.25 mm
2
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 *
V2
1.6
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 12.
9. Perform wiring in compliance with the safety regulations detailed in UL1995.
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)
0.3 ~ 1.25 mm
2
(0.75 ~ 1.25 mm
)*1
2
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)
Breaker for wiring (A)
1
(Non-fuse breaker)
Capacity
Fuse
16
16
3
25
25
3
32
32
3
MA Remote controller cables
Sheathed 2-core cable
0.3 ~ 1.25 mm
2
(0.75 ~ 1.25 mm
)*1
2
Max length: 200 m
20
30
40
6000
600
SAMPLE
60
10
1
0.1
0.01
1
20
2
3
4
6
8
10
C
Rated Tripping current (x)
Sample chart
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