Hitachi RAC-25WEB - Trouble Shooting

TROUBLE SHOOTING
MODEL RAC-18/25/35/50WEB,
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.
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.
Warning
Warning
Inspection instructions
Do not under any
circumstances get your
hand or metal part into
contact with the cabinet.
Danger!!!
Do not install
a grounding.
Power supply
Power circuit
Control circuit
Control circuit
Indoor fan motor
Outdoor ElectricalIndoor Electrical
1
2
3
L
N
0V line
Power circuit
Compressor
motor
Voltage between each
part and ground
Potential at
points
Potential at
points
320V
Potential at points
1Φ 230V 50Hz
375 F
Power supply
Power circuit
Control circuit
Control circuit
Indoor fan motor
Outdoor ElectricalIndoor Electrical
1
2
3
L
N
0V line
Power circuit
Compressor
motor
1Φ 230V 50Hz
500 F
3
0V line
RAC-18/25/35WEB RAC-50W B
E
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