– 164 –
b
a
TROUBLE SHOOTING
MODEL RAC-50WX8, RAC-D18EX3
PRECAUTIONS FOR CHECKING
DANGER
DANGER
Remember that the
0V line is biased to
320 - 360V in
reference to the
ground level.
1.
Also note that it takes
about 10 minutes
until the voltage fall
after the power switch
is turned off.
2.
When using an
oscilloscope, never
ground it. Don't forget
that high voltages as
noted above may
apply to the
oscilloscope.
Power source
1
φ,
220 - 230V, 50Hz
N
L
System power module 2
Compressor motor
MAIN P.W.B.
(0V)
C
D
0V
DC35V
Indoor unit
electric parts
Control
P.W.B.
M
AC
T Module
Po
w
er module
Across a
ーground ……………………
approx 155 - 170V
Across b (0V line)
−ground …………
approx 155 - 170V
Across a
ー
b (0V line)
………………
approx 320 - 360V
Outdoor unit P.W.B.
Oscilloscope
DANGER!
Always keep your hands
and metallic things away
from the enclosure of the
oscilloscope.
Don't install
the ground
line.