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10 ELECTRICAL WIRING
10-1. OVERVIEW OF POWER WIRING
10-2. WIRE DIAMETER AND MAIN POWER SWITCH CAPACITY
10-2-1. Wiring diagram for main power supply
10-2-2. Power supply wire diameter and capacity
This chapter provides an introduction to electrical wiring for the CITY MULTI-S series, together with notes concerning power
wiring, wiring for control (transmission wires and remote controller wires), and the frequency converter.
Outdoor unit
Indoor unit
Grounded
Grounded
Pull box
Breaker for Wiring
and Current Leakage
Power supply
(Single phase 60Hz 208/230V)
Breaker for Wiring
and Current Leakage
Power supply
(single phase 60Hz 208/230V)
(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.
For example, use wiring such as YZW.
(6) Install an earth longer than other cables.
(7) Use copper supply wires. Use electric wires over the rating voltage 300V.
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.
30 A 30 mA 0.1 sec. or less
30 A 26 A 40 A
Indoor Unit
Main Cable*2
Minimum Wire Thickness
(mm
2
[AWG])
Breaker for Current
Leakage
Refer to installation manual of indoor unit.
Minimum
circuit
ampacity
Maximum rating
of over current
protector device
Model
Outdoor Unit
P36, P48
5.3 [AWG10]
5.3 [AWG10]
Breaker
for
Wiring*1
Ground
~/N (single), 60Hz 208/230V
~/N (single), 60Hz 208/230V
Power Supply
*1. A breaker with at least 3.0 mm contact separation in each poles shall be provided. Use earth leakage breaker (NV).
*2. Use copper supply wires. Use the electric wires over the rating voltage 300V.