6. Electrical Wiring
●
LOCK ALL ELECTRICAL POWER SUPPLY SWITCHES IN THE OFF POSITION BEFORE INSTALLING
THE UNIT. FAILURE TO DISCONNECT POWER SUPPLY MAY RESULT IN ELECTRICAL SHOCK OR
EVEN DEATH.
●
Turn off the main power switch to the
Switch
B
ox
, the indoor unit and the outdoor unit before
electrical
wiring work or a periodical check is performed.
●
Insulate electrical wiring, condensate piping, and electrical components from threats posed by
burrowing animals and temperature extremes. Failure to do so can over time, deteriorate system
performance.
●
Secure the cables. External forces on the terminals could lead to a fire.
●
Tighten screws according to the following torque.
M4: 1.0 to 1.3 N
●
m (0.7 to 1.0 ft.lbs) (TB1, TB2)
●
Wrap the field-supplied insulation around the wires, and plug the wiring connection hole with the
seal material to protect the product from any condensate water or insects.
●
Tightly secure the wires with the cable clamp inside the
Switch
B
ox
.
●
Do not connect the ground wiring to the gas pipe, condensate pipe or lightening conductor.
Gas pipe: An explosion and ignition may occur when gas leaks.
Water pipe: There is no effect of ground wiring when a hard vinyl pipe is used.
Lightning conductor: The ground electric potential abnormally increases when a lightning
conductor is used.
6.1
General
Check
(1)
Make
sure
that
the
field-selecte
d
electrical
components
(main
switches,
fuses,
ELB
(Earth
Leakage
Breaker),
wires,
conduit
connectors
and
wire
terminals)
are
properly
selected
according
to
the
electrical
data
indicated
in
Table
6.1.
Make
sure
that
the
components
comply
with
National
Electrical
Code
(NEC).
(2)
Communication
cable
must
be
a
minimum
of
18-Gauge,
2-Conductor,
Stranded
Copper.
Shielded
cable
must
be
considered
for
applications
and
routing
in
areas
of
high
EMI
and
other
sources
of
potentially
excessive
electrical
noise
to
reduce
the
potential
for
communication
errors.
When
shielded
cabling
is
applied,
proper
bonding
and
termination
of
the
cable
shield
is
required
as
per
HITACHI
guidelines.
Plenum
and
riser
ratings
for
communication
cables
must
be
considered
per
application
and
local
code
requirements.
(3)
Use
shielded
communication
cable
for
communication
cable
between
the
indoor
and
the
outdoor
unit
(Max.
1,000m
(3,281
ft)),
and
connect
the
shielded
part
to
the
ground
screw
in
the
electrical
box.
(4)
Make
sure
that
the
power
supply
voltage
is
within
±10%
of
the
rated
voltage.
(5)
Check
the
capacity
of
the
electrical
wiring.
If
the
power
supply
capacity
is
too
low,
the
system
cannot
be
started
due
to
the
voltage
drop.
(6)
Make
sure
that
the
ground
wiring
is
connected.
15