Power Circuit (Low Voltage) - Hitachi YUTAMPO Series Service Manual

4 Electrical checks of main parts
Outdoor unit

4.1.2 Power circuit (low voltage)

The 230V AC voltage is rectified to DC voltage (B-12V,16V,12V,5V) pass through switching control IC (ICI), switching
transformer.
• (1) B-12V Power supply for electrical expansion valve.
• (2) 16V Power supply for IPM driver circuit of compressor and fan motor, IGBT action.
• (3) 12V Power supply for 4 way valve relay, power relay, inrush current relay,motor current amplification.
• (4) 5V Power supply for microcomputer, peripheral circuits.
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Main parts
Name
C001,C002,C003,C004,C005,C011,C013,C014,
NF1
Surge absorber, varistor 1,2,5,8
IC4
38 SMGB0135 rev.0 - 06/2020
These absorb electrical noise generated during operation of compressor and
also absorb external noise entering from power line to protect electronic parts.
These absorbs external power surge.
DC/DC convertor IC (DC12V -> DC5V)
Description