Installation manual
15
REMQ8~16P7Y1B
VRVIII System air conditioner
4PW37156-1
Outside unit
8.8.
Field line connection: power wiring
The power cord must be clamped to the plastic bracket using field
supplied clamp material.
The green and yellow striped wrapped wires must be used for
grounding.
■
Be sure to follow the limits below. If the unit-to-unit
cables are beyond these limits, it may result in
malfunction of transmission.
-
Maximum wiring length:
1000 m
-
Total wiring length:
2000 m
-
Maximum interunit wiring length
between outdoor units in the same
system:
30 m
-
Maximum number of branches:
16
■
Maximum number of outdoor units connectable: 10.
■
Up to 16 branches are possible for unit-to unit cabling.
No branching is allowed after branching.
■
Never connect the power supply to transmission
wiring terminal block. Otherwise the entire system
may break down.
■
Never connect 400 V to the terminal block of the
interconnecting wiring. Doing so will break the entire
system.
-
The wiring from the indoor units must be
connected to the F1/F2 (In-Out) terminals on the
PC board in the outdoor unit.
-
After installing the interconnecting wires inside the
unit, wrap them along with the on-site refrigerant
pipes using finishing tape, as shown in
For the above wiring, always use vinyl cords with 0.75
to 1.25 mm
2
sheath or cables (2-core wires).
■
Be sure to keep the power line and transmission line
apart from each other.
■
Be careful about polarity of the transmission line.
■
Make sure that the transmission line is clamped as
shown in
■
Check that wiring lines do not make contact with
refrigerant piping.
■
Firmly close the lid and arrange the electrical wires as
to prevent the lid or other parts from coming loose.
■
When you do not use a wire conduit, be sure to
protect the wires with vinyl tubes etc, to prevent the
edge of the knock-out hole from cutting the wires.
1
Outdoor unit
2
Indoor unit
3
Main line
4
Branch line 1
5
Branch line 2
6
Branch line 3
7
No branch is allowed after branch
A
Transmission wiring between outdoor unit and indoor
unit(s)
B
Transmission wiring between outdoor units
1
Liquid pipe
2
HP/LP gas pipe
3
Finishing tape
4
Suction gas pipe
5
Transmission wiring
6
Insulation material
1
Power supply (380~415 V, 3 N~50 Hz)
2
Earth leakage breaker
3
Fuse
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)
10
Cup washer
11
When connecting the earth wire, it is recommended to perform
curling.
■
Do not allow the ground wires to contact the
compressor lead wires. If the wires contact each
other, adverse effects may occur to other units.
■
When connecting or disconnecting a power supply
cord, make sure that the current-carrying conductors
become taut before the earthing conductor.
Precautions when laying power wiring
■
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.
■
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.)
Tightening torque (N•m)
M8 (Power terminal block)
5.5~7.3
M8 (Ground)
