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250C7Y1B
Split system air conditioner
4PW34720-1G – 07.2010
Installation manual
13
8.5.
Examples
System example
(See figure 22)
Field line connection
L1, L2, L3, N-phase of the power cord should be clamped to the
plastic bracket using field supplied clamp material.
The green and yellow striped wrapped wires should be used for
grounding.
(See figure 21)
See
figure 24
Fixing field line connection
(See figure 23)
1
Field power supply
2
Main switch
3
Earth leakage breaker
4
Fuse
5
Remote controller
Power supply wiring (sheathed cable)
Wiring between units (sheathed cable)
1
Power supply (380~415 V, 3N~ 50 Hz)
2
Fuse
3
Earth leakage breaker
4
Grounding wire
5
Power supply terminal block
6
Connect each power wire
RED to L1, WHT to L2, BLK to L3 and BLU to N
7
Ground wire (GRN/YLW)
8
Clamp the power wire to the plastic bracket using a field supplied
clamp to prevent external force being applied to the terminal.
9
Clamp (field supply)
1
Power supply wiring
2
Wiring between units
3
Clamp to the electric box with field supplied clamps.
4
When routing out the power/ground wires from the right side:
5
When routing the remote control cord and inter-unit wiring, secure
clearance of 50 mm or more from the power wiring. Ensure that
the power wiring does not contact any heated sections (
).
6
Clamp to the back of the column support with field supplied
clamps.
7
When routing out the inter-unit wirings from the opening for piping:
8
When routing out the power/ground wires from the front:
9
When routing out the ground wires from the left side:
10
Grounding wire
11
When wiring, pay attention not to detach the acoustic insulators
from the compressor.
Precautions when installing power wiring
Use round pressure terminals for connections to the power
terminal block.
When none are available, follow the instructions below.
■
Do not connect wiring of different thicknesses to the
power terminal block. (Slack in the power wiring may
cause abnormal heat.)
■
When connecting wiring which is the same thickness,
do as shown in the figure below.
■
For wiring, use the designated power wire and
connect firmly, then secure to prevent outside
pressure being exerted on the terminal board.
■
Use an appropriate screwdriver for tightening the
terminal screws. A screwdriver with a small head will
strip the head and make proper tightening impossible.
■
Over-tightening the terminal screws may break them.
■
Make sure that all wiring is secure, using the specified
wires and ensuring that external forces do not act on
the terminal connections or wires.
Incomplete connection or fixing may cause a fire.
■
See the table below for tightening torque for the
terminal screws.
Recommendations when connecting the ground
When pulling the ground wire out, wire it so
that it comes through the cut out section of
the cup washer. (An improper ground
connection may prevent a good ground
from being achieved.)
1
Wiring between the units (Indoor - outdoor)
2
Fix to the indicated plastic brackets using field supplied clamping
material.
3
Plastic bracket
Tightening torque (N•m)
M8 (Power terminal block) (X4M)
5.5~7.3
M8 (Ground)
M3 (Optional wiring terminal block) (X1M, X3M)
0.8~0.97
M4 (Inter-unit wiring terminal block) (X2M)
1.4~1.6