Power Cable Specifications - Mitsubishi Electric PQRY-P72TLMU-A Manual

10. ELECTRICAL WORK
1. Electrical work

1-3. Power cable specifications

10-3. Power Cable Specifications
Thickness of wire for main power supply, capacities of the switch and system impedance
Model
Heat source unit PQRY-P72TLMU-A
PQRY-P96TLMU-A
PQRY-P120TLMU-A
PQRY-P144TLMU-A
PQRY-P168TLMU-A
PQRY-P192TLMU-A
PQRY-P216TLMU-A
PQRY-P240TLMU-A
F0 = 15 or less *1
Total operating
current of
F0 = 20 or less *1
the indoor unit
F0 = 30 or less *1
Model
Heat source unit PQRY-P72YLMU-A
PQRY-P96YLMU-A
PQRY-P120YLMU-A
PQRY-P144YLMU-A
PQRY-P168YLMU-A
PQRY-P192YLMU-A
PQRY-P216YLMU-A
PQRY-P240YLMU-A
F0 = 15 or less *1
Total operating
current of
F0 = 20 or less *1
the indoor unit
F0 = 30 or less *1
*1 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}
Indoor unit
Type1 PLFY-NBMU, PMFY-NBMU, PEFY-NMSU, PCFY-NKMU,
PKFY-NHMU, PKFY-NKMU
Type2 PEFY-NMAU
Type3 PEFY-NMHSU
Others Other indoor unit
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
30 or less 30 mA 0.1sec or less
100 or less 100 mA 0.1sec or less
1. Use dedicated power supplies for the heat source unit and indoor unit. Ensure OC and OS are wired individually.
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 for metal conduit wiring. If the voltage drops, use a wire that is one rank thicker in diameter. 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 of parts of appliances for heat source 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 installer.
 Be sure to use specified wires for connections and ensure no external force is imparted to terminal connections. If connections are not fixed firmly, heating or fire may result.
 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.
WR2-118
MEE15K020
Minimum wire thickness (mm
Main cable
3.3/12
5.3/10
8.4/8
13.3/6
13.3/6
21.2/4
33.6/2
33.6/2
2.1/14
3.3/12
5.3/10
Minimum wire thickness (mm
Main cable
2.1/14
2.1/14
3.3/12
3.3/12
5.3/10
5.3/10
8.4/8
13.3/6
2.1/14
3.3/12
5.3/10
V1
18.6
38
13.8
0
Wire thickness
2
1.5 mm
2
2.5 mm
2
4.0 mm
PQRY-P-T(S)LMU, Y(S)LMU (April 2017 Ver2)
2
/AWG)
Branch Ground
- 3.3/12
- 5.3/10
- 8.4/8
- 13.3/6
- 13.3/6
- 21.2/4
- 33.6/2
- 33.6/2
2.1/14 2.1/14
3.3/12 3.3/12
5.3/10 5.3/10
2
/AWG)
Branch Ground
- 2.1/14
- 2.1/14
- 3.3/12
- 3.3/12
- 5.3/10
- 5.3/10
- 8.4/8
- 13.3/6
2.1/14 2.1/14
3.3/12 3.3/12
5.3/10 5.3/10
V2
2.4
1.6
4.8
0
V3
48
56
66
DATA U11
6000
600
SAMPLE
60
10
1
0.1
0.01
1 2 3 4 6 8 10 20
C
Rated Tripping current (x)
Sample chart
4 - 293
© 2017 Mitsubishi Electric US, Inc.