Troubleshooting by Remote Controller Si20-701_B
175
∗1: Connector code: X31A
∗2: Method of voltage measurement
∗3: Pressure/ voltage characteristic of the sensor
Outdoor unit PCB A1P
Low pressure sensor
Micro-computer
A/D input
GND
+5V
Connector
Red
Black
White
(4)
(3)
(2)
(1)
Measure voltage here.
Output voltage V
PL: detected pressure (Mpa)
V: output voltage (V)
1.5
1.0
0.5
0
-
0.5
0
-
0.5 0.5 1 1.5 2 2.5 3 3.5 4
Vcc
PL=0.57V
-
0.28
PL
Detected pressure PL (MPa)
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