Daikin VRV - WII, Service Manual

Page: 189 / 312

Troubleshooting by Indication on the Remote Controller SiUS30-604
176 Troubleshooting
Troubleshooting
YES
NO
NO
YES
NO
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Set up a pressure gauge in the low pressure
service port.
Connect the Service Checker.
Restart operation after resetting operation.
Is the stop
valve opened?
•
The low pressure sensor is normal and the main PCB pressuredetection
is also normal.
•
In fact, low pressure is dropping.
Are
low pressure
sensor characteristics
normal?
(
∗
1)
Is PCB
detector pressure
normal?
(
∗
2)
Replace the main PCB.
Replace the low pressure sensor.
Open the stop valve.
∗
1 : Compare the pressure sensor voltage measurements with pressure gauge readings.
(For the pressure sensor, voltage is measured at the connector and converted to
pressure in accordance with page 280.)
∗
2 : Compare “low pressure” measured with the Service Checker with pressure sensor
voltage measurements (refer to
∗
1).
∗
3 : Measure the voltage of the pressure sensor.
: Refer to page 250 to eliminate the causes of low pressure drop.
CHECK 2
+5V
(4)
(3)
(1)
(2)
Microcomputer
A/D input
Measure the voltage (DC) between
these two points.
Connector for low
pressure sensor (Blue)
Red
Black
White
LP pressure sensor