Daikin RZQ Series FCQ20EVA Service Manual page 166

Troubleshooting by Remote Controller
CHECK 5
Check Pressure Sensor
Measure the voltage (DC) between pins 1 and 3 of the connector.
Detected Pressure
(kg/cm²) MPa
157
Outdoor unit PCB (A1P)
GND
Micro-computer
A/D input
Measure DC voltage here.
P
H
51.0 5.0
45.9 4.5
40.8 4.0
35.7 3.5
30.6 3.0
25.5 2.5
20.4 2.0
15.3 1.5
10.2 1.0
5.1 0.5
0 0
-5.1 -0.5
-0.5 0 0.5 1
Output voltage (V
+5V
Connector Red
P
H
1.5 2 2.5 3 3.5
V
)
H
Red
Black
White
P = 1.38V – 0.69
H H
P : Detected pressure (MPa)
H
V : Output voltage (V)
H
4
DC
Service Diagnosis
SiME281501E