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5. Electrical work
A
B
~230V
A
~230V
Fig. 5-7
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} + ···
~ 230 V
Indoor
unit 1
• 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 PLFY-NEMU × 4 + PEFY-NMAU × 1, C = 8 (refer to right sample chart)
V1 of PLFY-NEMU = 19.8, V1 of PEFY-NMAU = 38
F2 = 19.8 × 4/8 + 38 × 1/8
= 14.65
→ 16 A breaker (Tripping current = 8 × 16 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) + V2 × ···
+ 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.
G1
Current sensitivity
30 or less
30 mA 0.1 sec or less
100 or less
100 mA 0.1 sec or less
5.3. Types of control cables
1. Wiring transmission cables
Shielding wire
Types of transmission cable
Use UL wire rated 300 V
Cable diameter
More than 1.25 mm² (AWG16)
Length
Less than 200 m, 219 yard
2. M-NET Remote control cables
Shielding wire
Types of remote control cable
Use UL wire rated 300 V
Cable diameter
0.5 (AWG20) to 1.25 mm² (AWG16)
Add any portion in excess of 10 m, 33 ft to within the longest
Length
allowable transmission cable length 200 m, 219 yard.
3. MA Remote control cables
2-core cable (unshielded)
Types of remote control cable
Use UL wire rated 300 V
Cable diameter
0.3 (AWG22) to 1.25 mm² (AWG16)
Length
Less than 200 m, 219 yard
D
C
C
C
C
C
B
D
L1 L2 GR
M1
M2
S
1 2
C
TB2
TB5
TB15
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 2
unit 3
Indoor unit
Type 1 PLFY-NEMU
Wire thickness (mm
5.2. Power supply wiring
• 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.
• A switch with at least 3 mm, 1/8 inch contact separation in each pole shall be
provided by the air conditioner installation.
[Fig. 5-7]
Ground-fault interrupter
A
Local switch/Wiring breaker
B
Indoor unit
C
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
Fuse
2.1/14
15
15
3.3/12
20
20
5.3/10
30
30
Indoor
unit 3
V1
V2
19.8
2.4
2
/AWG)
V3
2.1/14
48
3.3/12
56
5.3/10
66
Breaker for wiring
Ground-fault interrupter *1
(NFB)
15
15 A current sensitivity *3
20
20 A current sensitivity *3
30
30 A current sensitivity *3
Sample chart
6000
600
60
10
1
0.1
0.01
1
2
3
4
Rated Tripping current (x)
2
(AWG14) 0.2 km
SAMPLE
6
8
10
20
C
en
6
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