Specifications

1. Electrical work
DATA U10
4 - 7SYSTEM DESIGN
S.D. S
1-3. Power cable specifications
Thickness of wire for main power supply, capacities of the switch and system impedance
1-phase 2-wire, 208V, 60Hz
Minimum wire thickness (mm
2
/AWG) Swith (A)
Breaker for wiring
(NFB)
Breaker for current leakage
Main cable Branch Ground Capacity Fuse
PUMY-P-NHMU P36, P48 5.3/10 - 5.3/10 30 30 30 30A 30mA 0.1sec. or less
PUMY-P-NKMU P60 8.4/8 - 8.4/8 40 40 40 40A 30mA 0.1sec. or less
Total operating
current of
the indoor unit
F0 = 15 or less *1 2.1/14 2.1/14 2.1/14 15 15 15 15A current sensitivity *2
F0 = 20 or less *1 3.3/12 3.3/12 3.3/12 20 20 20 20A current sensitivity *2
F0 = 30 or less *1 5.3/10 5.3/10 5.3/10 30 30 30 30A current sensitivity *2
1-phase 2-wire, 230V, 60Hz
Minimum wire thickness (mm
2
/AWG) Swith (A)
Breaker for wiring
(NFB)
Breaker for current leakage
Main cable Branch Ground Capacity Fuse
PUMY-P-NHMU P36, P48 5.3/10 - 5.3/10 30 30 30 30A 30mA 0.1sec. or less
PUMY-P-NKMU P60 8.4/8 - 8.4/8 40 40 40 40A 30mA 0.1sec. or less
Total operating
current of
the indoor unit
F0 = 15 or less *1 2.1/14 2.1/14 2.1/14 15 15 15 15A current sensitivity *2
F0 = 20 or less *1 3.3/12 3.3/12 3.3/12 20 20 20 20A current sensitivity *2
F0 = 30 or less *1 5.3/10 5.3/10 5.3/10 30 30 30 30A current sensitivity *2
*1 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 V2
Type1 PLFY-NBMU, PMFY-NBMU, PEFY-NMSU, PCFY-NKMU,
PKFY-NHMU, PKFY-NKMU
18.6 2.4
Type2 PEFY-NMAU 38 1.6
Type3 PEFY-NMHSU 13.8 4.8
Others Other indoor unit 0 0
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-NMSU × 4 + PEFY-NMAU × 1, C = 8 (refer to right sample chart)
F2 = 18.6 × 4/8 + 38 × 1/8
= 14.05
16 A breaker (Tripping current = 8 × 16 A at 0.01s)
*2 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])
G1 Current sensitivity Wire thickness V3
30 or less 30 mA 0.1sec or less 1.5 mm
2
48
100 or less 100 mA 0.1sec or less 2.5 mm
2
56
4.0 mm
2
66
1. Use a separate power supply for the outdoor unit and indoor unit.
2. Bear in mind ambient conditions (ambient temperature,direct sunlight, rain water,etc.) when proceeding with the wiring and connections.
3. The wire size is the minimum value f or metal conduit wiring. The power cord size should be 1 rank thicker consideration of voltage drops. Make sure the power-supply voltage does not
drop more than 10 %. Make sure that the voltage imbalance between the phases is 2% or less.
4. Specific wiring requirements should adhere to the wiring regulations of the region.
5. Power supply cords o f parts of appliances for outdoor use shall not be lighter than polychloroprene sheathed flexible cord (design 245 IEC57). For example, use wiring such as YZW.
6. A switch with at least 3 mm [1/8 in] contact separation in each pole shall be provided by the Air conditioner installation.

Be sure to use specified wires to connect so that no external force is imparted to terminal connections. If connections are not fixed firmly, it may cause heating or fire.

Be sure to use the appropriate type of overcurrent protection switch. Note that generated overcurrent may include some amount of direct current.

The breakers for current leakage should support Inverter circuit. (e.g. Mitsubishi Electric's NV-C series or equivalent). If no earth leakage breaker is installed, it may cause an electric shock.

Breakers for current leakage should combine using of switch.

Do not use anything other than a breaker with the correct capacity. Using a breaker of too large capacity may cause malfunction or fire.

If a large electric current flows due to malfunction or faulty wiring, earth-leakage breakers on the unit side and on the upstream side of the power supply system may both operate.
Depending on the importance of the system, separate the power supply system or take protective coordination of breakers.
20
C
1086432
1
0.01
0.1
1
10
60
600
6000
SAMPLE
Tripping Time [s]
Rated Tripping current (x)
Sample chart