Trouble Shooting - Hitachi RAF-25RXB Service Manual

TROUBLE SHOOTING

MODEL RAC-25/35/50FXB
Inspection instructions
Warning
Note that the 0 V line of the
outdoor electrical parts and
the primary power circuit of
the indoor electrical parts
have voltages to ground as
illustrated in the right-hand
figure.
Warning
When conducting a check
with an oscilloscope or
something similar, do not
ground the oscilloscope.
Note that the oscilloscope
will be subjected to voltages
as illustrated in the figure
above.
Indoor fan motor
Power supply
Indoor Electrical
1Φ 230V 50Hz
Control circuit
Voltage between each
part and ground
Grounding voltage
13ー1
Outdoor Electrical
L
N
1
0V line
2
Control circuit
3
Grounding
Potential at Potential at
points points
Potential at points
Do not under any
circumstances get your
hand or metal part into
contact with the cabinet.
Compressor
motor
320V
Danger!!!
Do not install
a grounding.