Daikin LRLEQ5AY1(E) - Page 114

SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 113
Troubleshooting
∗1: Voltage measurement point
∗2: Refer to “Voltage Characteristics of Pressure Sensor” table on P.139.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
1.Set the low pressure gauge.
2.Connect a RAM monitor.
Piping for different
circuit is erroneously
connected.
YES
NO
Are the characteristics of the low
pressure sensor normal? (Make
a comparison between the
voltage characteristics (
∗ 1) and
the gauge pressure.)
NO
YES
If the PCB pressure detection
normal? (Make a comparison
between the checker pressure
data and the voltage
characteristics (*1).)
NO
YES
Reset the operation, and then
restart the outdoor unit.
Are the characteristics of
the low pressure sensor
normal?( ∗ 2)
NO
YES
Correct the piping.
Replace the low pressure sensor.
Replace the main PCB.
Replace the low pressure sensor.
Replace the main PCB.
(V2808)
Outdoor unit PCB (A2P)
+5V
GND
Micro-computer
A/D input
∗2 Measure voltage here.
Connector
X31A
(4)
(3)
(2)
(1)
Red
Black
White
Low pressure sensor
(S1NPL)