Hitachi RAS-18FH6 - TROUBLE SHOOTING; PRECAUTIONS FOR CHECKING

– 63 –
TROUBLE SHOOTING
RAC-18YH6, 25YH6
PRECAUTIONS FOR CHECKING
WARNING
WARNING
Always keep your hands
and metallic things away
from the cabinet.
DANGER!
Donít install
the ground
line.
When using an
oscilloscope, never
ground it.
Donít forget that high
voltage as noted in
the figure above may
apply to the
oscilloscope.
Remember that
voltage of 175 V is
applied to the 0V line
on the P.W.B. or the
like as shown in the
right diagram.
Indoor Controller
Outdoor Controller
Power Switch
Point
400 F
I.P.M
Compressor
motor
Point
line
Control
P.W.B.
Main
P.W.B.
Voltage at point A
G
round voltage
Grounding
350V
Point B (0V line)
Power
inlet
RAS_AW_063-082e 11/17/06, 11:51 AM63