Hitachi RAF-25NH4 Données Techniques page 183

(5) C001-C014, NF COIL 1
These coils absorb electrical noises generated during
the compressor is operating and invasive noises
entering from L and N terminals, and prevent the
electronic parts from them.
(6) SURGE ABSORBER, VARISTOR 1-3
These electronic parts absorb invasive noises like an
inductive thunder.
(7) INRUSH PROTECTIVE RESISTOR (R002,R003)
INRUSH PROTECTIVE RESISTOR (R004)
The resistors work to limit an over current when power
is just turned on.
(8) CT
The part detects an electrical current and limits it to be
not in excess at high loading.
Be sure to make an earth line for the outdoor unit. If not, the
※
noise filter circuit does not work normally.
Be sure to make an earth line for the outdoor unit.
※
If not, the surge absorber and varistor 1-3 can not work.
Reference
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When the inrush protective resistor is defective, the DB1
may malfunction. As a result, No DC voltage is generated
and no operation can be done. In this case, the 5A fuse may
blow.
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