Wiring Of Main Power Supply And Equipment Capacity - Mitsubishi Electric CITY MULTI PQRY-P250 Installationshandbuch

9.4. Wiring of main power supply and equipment capacity

Warning:
• Be sure to use specified wires to connect so that no external force is imparted to terminal connections. If connections are not fixed firmly,
it may cause heating or fire.
• Be sure to use the appropriate type of overcurrent protection switch. Note that generated overcurrent may include some amount of direct current.
Caution:
• The reverse phase of L lines (L1, L2, L3) can be detected (Error cord: 4103), but the reverse phase of L lines and N line can not be detected.
The some electric parts should be damaged when power is supplied under the miss wiring.
• Some installation site may require attachment of an earth leakage breaker. If no earth leakage breaker is installed, it may cause an electric shock.
• Do not use anything other than breaker and fuse with correct capacity. Using fuse and wire or copper wire with too large capacity may
cause a malfunction of unit or fire.
Schematic Drawing of Wiring (Example)
A
G
A Power Supply (3-Phase, 4-Wire) 380/400/415 Volt
B Switch (Breakers for Wiring and Current Leakage)
C Heat Source Unit
D Ground
E Refrigerant pipe
Thickness of Wire for Main Power Supply and On/Off Capacities
Minimum Wire Thickness (mm
Main Cable
Model
PQRY-P200 4.0
PQRY-P250 6.0
Wire Thickness (mm)
Main
Branch
Cable
Model
BC controller
1.5 1.5
Indoor Unit
1. Use a separate power supply for the heat source unit and indoor unit, BC controller.
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 reglon.
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.
26
B
C
E
B
I
2 ) Switch (A)
Branch Ground Capacity
– 4.0 32
– 6.0 40
Switch (A)
Breaker for
Ground Capacity Fuse
16 16
1.5
D
F
I I
F BC Controller
G Power Supply (Single-Phase) 220/230/240 Volt
H Pull Box
I Indoor Unit
Breaker
for Wiring Breaker for Current Leakage
Fuse
(NFB)
32 40 A 30 A 100 mA 0.1 sec. or less
40 40 A 40 A 100 mA 0.1 sec. or less
Breaker for Current Leakage
Wiring
20 A 20 A 30 mA 0.1 sec or less
H
I