14
Warning:
• In case of A-control wiring, there is high voltage potential on the S3 terminal
caused by electrical circuit design that has no electrical insulation between
power line and communication signal line. Therefore, please turn off the main
power supply when servicing. And do not touch the S1, S2, S3 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 connection cable, otherwise it may result in a smoke, a fire or communication failure.
B1
B2
L1
L2
GR
Outdoor unit
poles isolator (Switch)
Branch box
7. Electrical work
Indoor unit
V1
V
Type 1
SEZ-KD·NA, PLA-A·BA
19.8
.4
Type
PEAD-A·AA
6.9
Type 3
MSZ-FE·NA
9.9
Type 4
MSZ-FH·NA, MSZ-GE·NA
6.8
Type 5
SLZ-KA·NA
3.5
Type 6
MFZ-KA·NA
16.
Type 7
MVZ-A·AA
6.9
Type 8
Branch box (PAC-MKA·BC)
5.1
3.0
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 PEFY-VMS × 4 + PEFY-VMA × 1, C = 8 (refer to right sample chart)
F = 18.6 × 4/8 + 38 × 1/8
= 14.05
→ 16 A breaker (Tripping current = 8 × 16 A at 0.01 s)
**** Current sensitivity is calculated using the following formula.
G1 = V × (Quantity of Type1) + V × (Quantity of Type) + V × (Quantity of Type3) + V × (Quantity of Others)
+ V3 × (Wire length [km])
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
V3
1.5 mm
48
.5 mm
56
4.0 mm
66
6000
600
60
10
1
1
2
3 4
6 8
C
10
20
SAMPLE
Sample chart
Rated Tripping current (x)
Tripping T
ime
[s]
0.1
0.01
Thickness of Wire for Main Power Supply and On/Off Capacities
Model
Power Supply
Minimum Wire Thickness
(mm
[AWG])
Breaker for
Wiring*1
Breaker for Current
Leakage
Minimum cir-
cuit ampacity
Maximum rating of
over current protec-
tor device
Main Cable*
Ground
Outdoor Unit
4C36/5C5/
8C48NAHZ
~ (single), 60 Hz, 08/30 V
13.3 [AWG16] 13.3 [AWG16]
50 A
50 A 30 mA 0.1 sec.
or less
4 A
5 A
8C48NA
8.4 [AWG8]
8.4 [AWG8]
40 A
40 A 30 mA 0.1 sec.
or less
37 A
5 A
Indoor Unit
~ (single), 60 Hz, 08/30 V
Refer to installation manual of indoor unit.
*1. A breaker with at least 3.0 mm [1/8 inch] contact separation in each poles shall be provided. Use non-fuse breaker (NF) or earth leakage breaker (NV).
*2. Use copper supply wires. Use the electric wires over the rating voltage 300 V.
Total operating current of the indoor unit
Minimum wire thickness (mm
/AWG)
Ground-fault interruper *1
Local switch (A)
Breaker for wiring
(NFB)
Main Cable
Branch
Ground
Capacity
Fuse
F0 = 15A or less *
.1/14
.1/14
.1/14
15 A current sensitivity *3
15
15
15
F0 = 0A or less *
3.3/1
3.3/1
3.3/1
0 A current sensitivity *3
0
0
0
F0 = 30A or less *
5.5/10
5.5/10
5.3/10
30 A current sensitivity *3
30
30
30
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.
* Please take the larger of F1 or F as the value for F0.
F1 = Total operating maximum current of the indoor units × 1.
F = {V1 × (Quantity of Type1)/C} + {V1 × (Quantity of Type)/C} + {V1 × (Quantity of Type3)/C} + {V1 × (Quantity of Others)/C}
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