Toshiba RAV-162BH-PE Service Manual page 67

9.6 Serial signal circuit (between indoor and outdoor
units)
Transmits and receives the signals between indoor and
outdoor units in serial signals. As 230V is used for
transmitting the signal, the microcomputer section is
insulated with photo-coupler with 5V being supplied.
Input 5V
0
Output 5V
0
9.7 Abnormality-detecting circuit
When high pressure switch is operated, abnormality is
detected to stop the compressor.
9.8 Relay circuit
The relay circuit consists of the diagram on the
right-hand side.
RY05 : 4-way valve ON/OFF
RY07 : Magnetic switch ON/OFF
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H i g h
Pressure
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A C
Serial
input
Serial
output
a b n o r m a l
input
R e l a y c o n t r o l
circuit