Electrical Wiring; Wiring Of Main Power Supply And Equipment Capacity - Mitsubishi Electric PUMY-P112VKM4 Technical & Service Manual

9

ELECTRICAL WIRING

This chapter provides an introduction to electrical wiring for CITY MULTI series, together with notes concerning power wiring,
wiring for control (transmission wires and remote controller wires), and the frequency converter.
9-1. OVERVIEW OF POWER WIRING
(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 example, use wiring such as YZW.
(6) Install an earth line longer than power cables.
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:
· 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.
· Be sure to install N-Line. Without N-Line, it could cause damage to the unit.

9-2. WIRING OF MAIN POWER SUPPLY AND EQUIPMENT CAPACITY

9-2-1. Wiring diagram for main power supply
■ Schematic Drawing of Wiring: When NOT using a Branch Box (example)
PUMY-P•VKM4 series
～/N 220-230-240 V, 50 Hz
～/N 220 V, 60 Hz
PUMY-P•YKM(E)4 series
3N～380-400-415 V, 50 Hz
3N～380 V, 60 Hz (YKM4 only)
■ Schematic Drawing of Wiring: When using a Branch Box (example)
<When power is supplied from the outdoor unit>
PUMY-P•VKM4 series
～/N 220-230-240 V, 50 Hz
～/N 220 V, 60 Hz
PUMY-P•YKM(E)4 series
3N～380-400-415 V, 50 Hz
3N～380 V, 60 Hz (YKM4 only)
OCH673D
B
～/N 220-230-240 V, 50 Hz
A
～/N 220 V, 60 Hz
L/N
;
B
A
Note: The M-NET control indoor unit cannot receive power
L1/L2/L3/N
supplied from an outdoor unit, so provide it with power
separately.
;
B
A
;
L/N
B1/B2
;
B
A
;
L1/L2/L3/N
B1/B2
;
A
L/N
E
;
C
; S1/S2/S3
D
;
L/N
S1/S2/S3
D
;
S1/S2/S3
D
;
; Note:
Reactor Box (optional parts PAC-RB01BC)
C
When the product is used for a purpose other
;
S1/S2/S3
D
than as professional equipment,
;
L/N
S1/S2/S3
the Reactor Box may be necessary.
D
;
S1/S2/S3
;
Outdoor unit
1-phase power
supply
3-phase power
supply
135
F
L/N
L/N
E
E
;
;
;
A Switch (Breakers for Wiring and Current Leakage)
B Outdoor Unit
C Branch Box
D A-Control Indoor Unit
E M-NET Control Indoor unit
F Pull Box
Brach box power supply method
Power supply Separate power
from outdoor unit supply
Unnecessary Necessary
Necessary Necessary
L/N
E