Mitsubishi Electric MXZ-8C60NA Manuel D'installation page 14

7. Electrical work
Thickness of Wire for Main Power Supply and On/Off Capacities
Model
Outdoor Unit 8C60NA
Indoor Unit
*1. Be sure to ground the unit correctly. If required, take measures against leakage.
*2. Use copper supply wires. Use the electric wires over the rating voltage 300 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 Type 1)/C} + {V1 × (Quantity of Type 2)/C} + · · · + {V1 × (Quantity of Type 8)/C}
Indoor unit
Type 1 PEAD-A·AA, MVZ-A·AA
Type 2 PLA-A·BA, PLA-A·EA7, SEZ-KD·NA
Type 3 MFZ-KA·NA
Type 4 MSZ-FE·NA
Type 5 MFZ-KJ·NA, MSZ-GL·NA
Type 6 MSZ-FH·NA, MSZ-FH·NA2, MSZ-EF·NAW(B)(S)-U1, MSZ-GE·NA
Type 7 SLZ-KA·NA
Type 8 Branch box (PAC-MK·BC(B))
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 Branch Box × 2 + SEZ-KD∙NA × 5, C = 8 (refer to right sample chart)
F2 = 5.1 × 2/8 + 19.8 × 5/8
= 13.65
*3 Current sensitivity is calculated using the following formula.
G1 = V2 × Quantity of Type 1 + V2 × Quantity of Type 2 + · · · + V2 × Quantity of Type 8 + V3 (Wire length [kW])
G1 Current sensitivity
30 or less 30 mA 0.1 sec or less
100 or less 100 mA 0.1 sec or less
Wire thickness
2
1.5 mm
2.5 mm 2
4.0 mm 2
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 for 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%.
4. Specific wiring requirements should adhere to the wiring regulations of the region.
5. Power supply cords of parts of appliances for outdoor use shall not be lighter than polychloroprene sheathed flexible cord (design 60245 IEC57). For exam-
ple, use wiring such as YZW.
6. Install an earth longer than other cables.
Warning:
• Please turn off the main power supply when servicing. And do not touch the B1, B2
terminals when the power is energized. If isolator should be used between outdoor
unit and branch box/indoor unit and branch box, please use 3-pole type or 2-pole type.
(Please refer to figure below.)
• Turn on the main power when the ambient temperature is -20°C (-4°F) or higher.
• Under conditions of -20°C (-4°F), it needs at least 4hr stand by before the units
operate in order to warm the electrical parts.
Caution:
After using the isolator, be sure to turn off and on the main power supply to reset the system. Otherwise, the outdoor unit may not be able to detect the branch
box(es) or indoor units.
Be sure to connect the outdoor-branch box/indoor-branch box connecting cables directly to the units (no intermediate connections).
Intermediate connections can lead to communication errors if water enters the cables and causes insufficient insulation to ground or a poor electrical contact at the intermediate connection point.
(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.)
Never splice the power cable or the indoor-outdoor-branch box connection cable, otherwise it may result in a smoke, a fire or communication failure.
14
Minimum Wire Thickness
Power Supply
Main Cable*2
208/230 VAC, 60Hz 13.3 [AWG6]
208/230 VAC, 60Hz
Minimum wire thickness (mm
Main Cable Branch
2.1/14 2.1/14
3.3/12 3.3/12
5.5/10 5.5/10
V3
48
56
66
Breaker for
(mm [AWG])
2
Wiring*1
Ground
13.3 [AWG6] 50 A
Refer to installation manual of indoor unit.
/AWG)
2
Ground-fault interruper *1
Ground
2.1/14 15 A current sensitivity *3
3.3/12 20 A current sensitivity *3
5.3/10 30 A current sensitivity *3
V1 V2
26.9
19.8
16.2
9.9 2.4
7.4
6.8
3.5
5.1 3.0
B1
Outdoor unit
B2
Breaker for Current Minimum cir-
Leakage cuit ampacity
50 A 30 mA 0.1 sec.
46 A
or less
Local switch (A)
Capacity Fuse
15 15
20 20
30 30
Sample chart
6000
600
60
10
1
0.1
0.01
1 2 3
Rated Tripping current (x)
2 poles isolator (Switch)
L1
L2
GR
Maximum rating of
over current protec-
tor device
52 A
Breaker for wiring
(NFB)
15
20
30
SAMPLE
4 6 8 10 20
C
Branch box