Mitsubishi Electric City Multi PMFY-P NBMU Serie Manual De Instalación página 10

5. Electrical work
A
~208/230 V
~208/230 V
Total operating current of the indoor unit
F0 = 15A or less *2
F0 = 20A or less *2
F0 = 30A 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
• 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 : PMFY-NBMU × 2 + PLFY-NEMU × 2 + PEFY-NMAU × 1
V1 of PMFY-NBMU = 9.9, V1 of PLFY-NEMU = 19.8, V1 of PEFY-NMAU = 38, C = 8 (refer to right sample chart)
F2 = 9.9 × 2/8 + 19.8 × 2/8 + 38 × 1/8
= 12.2
→ 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 : PMFY-NBMU × 2 + PLFY-NEMU × 2 + PEFY-NMAU × 1
V2 of PMFY-NBMU = 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
30 or less
100 or less
Wire thickness
2
1.5 mm , AWG14
2
2.5 mm , AWG13
en
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. 5-2
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 Indoor
unit 1 unit 1 unit 2 unit 3
PMFY-NBMU
Current sensitivity
30 mA 0.1 sec or less
100 mA 0.1 sec or less
V3
48
56
66
5.2. Power supply wiring
• Install an earth line longer than other cables.
• Power supply codes of appliance shall not be lighter than design 245IEC57 or
C
227IEC57, 245 IEC 53 or 227 IEC 53.
• A switch with at least 3 mm, 1/8 in. contact separation in each pole shall be
provided by the air conditioner installation.
[Fig. 5-2]
Ground-fault interrupter
A
Local switch/Wiring breaker
B
Indoor unit
C
Pull box
D
Ground Capacity
2.1/14 15
3.3/12 20
5.3/10 30
Indoor
unit 3
V1 V2
9.9 2.4
Breaker for wiring
Ground-fault interrupter *1
(NFB)
Fuse
15 15 15A current sensitivity *3
20 20 20A current sensitivity *3
30 30 30A 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