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6. Electrical work
A
~208/230 V
~208/230 V
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} + ···
~ 208/230 V
Indoor
• V1 and V2
V1 and V2 are the breaker coefficient.
V1: Breaker coefficient of rated current
V2: Breaker coefficient of current sensitivity
The values of V1 and V2 differ from depending on the model. Therefore, please refer to IM of each model.
• C : Multiple of tripping current at tripping time 0.01 s
Please pick up "C" from the tripping characteristic of the breaker.
<Example of "F2" calculation>
*Condition : PKFY-NLMU × 2 + PLFY-NEMU × 2 + PEFY-NMAU × 1
V1 of PKFY-NLMU = 19.8, V1 of PLFY-NEMU = 19.8, V1 of PEFY-NMAU = 38, C = 8 (refer to right sample chart)
F2 = 19.8 × 2/8 + 19.8 × 2/8 + 38 × 1/8
= 14.65
→ 15 A breaker (Tripping current = 8 × 15 A at 0.01 s)
*3 Current sensitivity is calculated using the following formula.
G1 = V2 × (Quantity of indoor unit 1) + V2 × (Quantity of indoor unit 2) + V2 × (Quantity of indoor unit 3)
+ ··· + V3 × (Wire length [km])
<Example of "G1" calculation>
*Condition : PKFY-NLMU × 2 + PLFY-NEMU × 2 + PEFY-NMAU × 1
V2 of PKFY-NLMU = 2.4, V2 of PLFY-NEMU = 2.4, V2 of PEFY-NMAU = 1.6, Wire thickness and length: 1.5 mm
G1 = 2.4 × 2 + 2.4 × 2 + 1.6 × 1 + 48 × 0.2
= 20.8
As a result , current sensitivity is 30 mA 0.1 sec or less.
en
G1
30 or less
100 or less
Wire thickness
2
1.5 mm
, AWG14
2
2.5 mm
, AWG13
4.0 mm
2
, AWG11
9
D
B
C
C
C
C
A
B
D
L1 L2
M1
M2
S
1 2
C
TB2
TB5
TB15
Fig. 6-2
Minimum wire thickness (mm²/AWG)
Main cable
Branch
2.1/14
2.1/14
3.3/12
3.3/12
5.3/10
5.3/10
Indoor
Indoor
Indoor
unit 1
unit 1
unit 2
unit 3
PKFY-NLMU
Current sensitivity
30 mA 0.1 sec or less
100 mA 0.1 sec or less
V3
48
56
66
6.2. Power supply wiring
• Wiring size must comply with the applicable local and national codes.
• Use copper supply wires.
C
Use UL wires rated 300 V or more for the power supply cords.
• Install a ground wire longer than other cables.
• A switch with at least 3 mm, 1/8 inch contact separation in each pole shall be
provided by the air conditioner installation.
[Fig. 6-2]
A
Ground-fault interrupter
B
Local switch/Wiring breaker
C
Indoor unit
D
Pull box
Warning:
Never splice the power cable or the indoor-outdoor connection cable,
otherwise it may result in a smoke, a fire or communication failure.
Ground
Capacity
2.1/14
15
3.3/12
20
5.3/10
30
Indoor
unit 3
V1
V2
19.8
2.4
Breaker for wiring
Ground-fault interrupter *1
(NFB)
Fuse
15
15
15 A current sensitivity *3
20
20
20 A current sensitivity *3
30
30
30 A current sensitivity *3
Sample chart
6000
600
60
10
1
0.1
0.01
1
2
Rated Tripping current (x)
2
(AWG14) 0.2 km
SAMPLE
3
4
6
8
10
20
C
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