Mitsubishi Electric CITY MULTI PKFY-WL NKMU-E Series Installation Manual page 14

6. Electrical work
Total operating current of the indoor unit
F0 = 16 A or less *2
F0 = 25 A or less *2
F0 = 32 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 Type1)/C} + {V1 × (Quantity of Type2)/C} + {V1 × (Quantity of Type3)/C} + {V1 × (Quantity of Others)/C}
~ 208/230 V
Indoor unit
PLFY-NEMU, PMFY-NBMU, PEFY-NMSU,
Type 1
PCFY-NKMU, PKFY-NHMU, PKFY-NKMU, PLFY-NFMU
Type 2 PEFY-NMAU
Type 3 PEFY-NMHSU
Others Other indoor unit
• 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 Type1) + V2 × (Quantity of Type2) + V2 × (Quantity of Type3) + V2 × (Quantity of Others)
+ 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
30 or less
100 or less
Wire thickness
2
1.5 mm , AWG14
2
2.5 mm , AWG13
2
4.0 mm , AWG11
en
12
Minimum wire thickness (mm², AWG.No)
Main cable Branch
1.5, AWG14 1.5, AWG14
2.5, AWG13 2.5, AWG13
4.0, AWG11 4.0, AWG11
Indoor Indoor Indoor Indoor
unit 1 unit 1 unit 2 unit 3
Current sensitivity
30 mA 0.1 sec or less
100 mA 0.1 sec or less
V3
48
56
66
Ground-fault interrupter *1
Ground
1.5, AWG14 20 A current sensitivity *3
2.5, AWG13 30 A current sensitivity *3
4.0, AWG11 40 A current sensitivity *3
Indoor
unit 3
V1 V2
19.8 2.4
38 1.6
13.8 4.8
0 0
Local switch (A)
Breaker for wiring
(NFB)
Capacity Fuse
16 16
25 25
32 32
Sample chart
6000
600
SAMPLE
60
10
1
0.1
0.01
1 2 3 4 6 8
C
Rated Tripping current (x)
2
(AWG14) 0.2 km
20
30
40
10 20