Hitachi RAS-25WX8 Manuel De Maintenance page 82

MODEL RAC-25WX8, RAC-35WX8
1. The electr
and a harmonics improvement circuit as shown in Fig. 1-1.
• Main P.W.B.
This P.W.B. is equipped with the rectification diode, DC fan motor control circuit and the circuits
around the micro computer which take various controls.
• POWER P.W.B.
This P.W.B. is equipped with the noise filter, ICP power circuit, interface circuit, smoothing capacitor,
expansion valve control circuit and four-way valve control circuit.
• HARMONICS IMPROVEMENT CIRCUIT
This circuit is composed of the capacitor at the bottom of the electrical parts box and two reactors
attached to the BULKHEAD.
POWER P.W.B.
A
B
C
INTERFACE
CIRCUIT
D
REVERSING VALVE
CONTROL CIRCUIT
Downloaded from www.Manualslib.com
ical parts for the outdoor unit is composed of two P.W.B (a power P.W.B. and main P.W.B.)
SWITCHING
POWER SUPPLY.
ELECTRIC EXPANSION VALVE
CONTROL CIRCUIT
manuals search engine
MAIN P.W.B.
HARMONICS
IMPROVEMENT
CIRCUIT
FAN MOTOR
CONTROL
CIRCUIT
RESET
CIRCUIT
Fig. 1-1
– 81 –
IPM
INVERTER
CONTROLCIRCUIT
POSSITON
DETECTIVE
CIRCUIT
MICRO
COMPUTER
THERMISTOR
DETECTION
CIRCUIT
COMPRESSOR