Hitachi 3HRNM1Q Installation & Maintenance Manual page 28

5) Install main switch and ELB for each system separately. Select the high response type ELB that is acted within
0.1 second.
6) Separate the control wiring between outdoor unit and indoor unit more than approximately 5 to 6cm from power
supply wiring. Do not use a coaxial cable.
Keep a distance between
each wiring terminal and
attach insulation tape or
sleeve as shown in the figure.
Correct
Insulation Tape or Sleeve
Do not use a solderless
terminal when
a single wire is used.
If used it causes
abnormal heating at
the caulking portion
of the terminal.
If a single wire is used
connect the
wire direct as shown
in the figure.
I Field Minimum Wire Sizes for Power Source of Indoor Unit
G Connect S/I series indoor unit.
G Use an ELB (Electric Leakage Breaker). If not used, it will cause an electric shock or a fire.
G Do not operate the system until all the check points have been cleared.
NOTES:
1) Follow local codes and regulations when selecting field wires.
2) The power cable *1 stated above is chosen according to the maximum current value stipulated in GB4706.1-1998.
The size of the power cable over 63A is referred to other standards.
3) Use a shielded cable for the transmitting circuit and connect it to ground.
4)In the case that power cables are connected in series, add each unit maximum current and select wires by Table6.2 .
Install a multi-pole main switch with a space of 3.5mm or more between each phase.
Rear Cover
Incorrect
Earth
Wire
Power Supply
Cable
Earth Wire
Rubber Bush
Control Cable
(Accessory)
Fig. 6.6 Wiring Connection of Outdoor Unit
Wiring Method with Clamp
1. Insert the wires by into the
cord clamp and clamp them
as shown in the figure.
2. Perform wiring so that wires
do not touch the compressor,
refrigerant pipes or edge of
the covers.
Make a loop of the wires so that disconnecting
the wirings for replacing parts is not required.
CAUTION:
When using conduit, do NOT lead it in the outdoor
unit. If the conduit wiring touches the compressor
and refrigerant cycle in the outdoor unit, it may
cause to damage them.
21
Piping Cover
Conduit
Power Supply Cable