Mitsubishi Electric MXZ-8C48NA2 Installation Manual page 17

6. Electrical work
Indoor unit
Type 1 PEAD-A·AA, SVZ-A·AA
Type 2 PLA-A·EA7, SEZ-KD·NA
Type 3 SLZ-KF·NA
Type 4 MSZ-FE·NA, MLZ-KP·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 Branch box
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 : 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 Type1) + V2 × (Quantity of Type2) + V2 × (Quantity of Type3) + ... + V2 × (Quantity of Type7)
+ 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 (mm /AWG) V3
2
2.1/14 48
3.3/12 56
5.3/10 66
1. Bear in mind ambient conditions (ambient temperature,direct sunlight, rain water,etc.) when proceeding with the wiring and connections.
2. 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%.
3. Specific wiring requirements should adhere to the wiring regulations of the region.
4. 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.
5. 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 inter-
mediate 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.
V1
26.9
19.8
17.1
9.9
7.4
6.8
5.1
2 poles isolator (Switch)
B1
Outdoor unit
B2
V2
2.4
3.0
Branch box
L1
L2
Sample chart
6000
600
SAMPLE
60
10
1
0.1
0.01
1 2 3 4 6 8 10 20
C
Rated Tripping current (x)
en
16