Trouble Shooting; Inspection Instructions - Hitachi RAC-18WEC Service Manual

TROUBLE SHOOTING

MODEL RAC-18/25/35/50WEC
RAC-10/14/20WECI

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.
RAC-18/25/35WEC
RAC-10/14WECI
Indoor fan motor
Power supply
Indoor Electrical
1Φ 230V 50Hz
L
N
1
2
Control circuit Control circuit
3
Voltage between each
part and ground
0V line
Outdoor Electrical Indoor Electrical
Compressor
motor
0V line
Potential at
points
Do not under any
circumstances get your
hand or metal part into
contact with the cabinet.
RAC-50WEC
RAC-20WECI
Indoor fan motor
Power supply
Outdoor Electrical
1Φ 230V 50Hz
L
N
1
0V line
2
Control circuit Control circuit
3
Potential at
points
320V
Potential at points
Danger!!!
Do not install
a grounding.
Compressor
motor