Electrical Wiring Installation; Main Power Supply Wiring And Switch Capacity - Mitsubishi Electric QAHV Série Manuel D'installation & D'instructions

5. Electrical Wiring Installation

[1] Main Power Supply Wiring and Switch Capacity

Schematic Drawing of Wiring (Example)
A: Switch (with current breaking
capability)
B: Current leakage breaker
C: Outdoor unit
Main power supply wire size, switch capacities, and system impedance
Model
Main cable
42.4 mm
(Up to 78 m (255 ft))
QAHV-N136TAU-HPB
21.2 mm
(Up to 48 m (157 ft))
1. Use a dedicated power supply for each unit. Ensure that each unit is wired individually.
2. When installing wiring, consider ambient conditions (e.g., temperature, sunlight, rain).
3. The wire size is the minimum value for metal conduit wiring. If voltage drop is a problem, use a wire that is
one size thicker.
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 appliances for outdoor use shall not be lighter than polychloroprene sheathed
flexible cord (design 60245 IEC57).
6. A switch with at least 3 mm contact separation in each pole shall be provided by the Air Conditioner
installer.
7. Do not install a phase advancing capacitor on the motor. Doing so may damage the capacitor and result in
fire.
Warning:
• Be sure to use specified wires and ensure no external force is imparted to terminal connections. Loose
connections may cause overheating and fire.
• Be sure to use the appropriate type of overcurrent protection switch. Note that overcurrent may include
direct current.
Caution:
• Some installation sites may require an installation of an earth leakage breaker for the inverter. If no earth
leakage breaker is installed, there is a danger of electric shock.
• Only use properly rated breakers and fuses. Using a fuse or wire of the wrong capacity may cause
malfunction or fire.
Control cable specifications
Size
Remote controller cable
Recommended cable types
Size
M-NET cable between units
*1
Recommended cable types
External input wire size
External output wire size
*1 Use a CVVS or CPEVS cable (Max. total length of 200 m) if there is a source of electrical interference near by (e.g., factory) or the total length of control wiring
exceeds 120 m.
*2 When the wiring length exceeds 10 m, use wire of 1.25 mm
3~208–230 V
L , L , L
1 2
2
Minimum wire thickness (mm )
Branch PE
2 2
(AWG 1) 42.4 mm (AWG 1)
(Up to 78 m (255 ft))
-
2 2
(AWG 4) 21.2 mm (AWG 4)
(Up to 48 m (157 ft))
2
.
B A
C
3
PE
Local switch (A)
Current leakage
breaker
Capacity
100 A 100 mA 0.1
100
sec. or less
0.3 - 1.25 mm² (AWG 22 - 16) (Max. 200 m (656 ft) total)*2
CVV
Min. 1.25 mm² (AWG 16) (Max. 120 m (393 ft) total)
Shielded cable CVVS, CPEVS or MVVS
Min. 0.3 mm² (AWG 22)
1.25 mm² (AWG 16)
GB-53
No-fuse MCA (A)
breaker (A) (208 V/230 V)
Fuse
100 100 67
MOP (A)
(208 V/230 V)
110