Daikin VRV III REYQ8PY1, Service Manual

Page: 265 / 452

Troubleshooting by Indication on the Remote Controller Si37-701
254 Troubleshooting
Troubleshooting
NO
YES
NO
YES
YES
CHECK 6
Is the stop
valve open?
Open the stop valve.
Mount a pressure gauge on the low-pressure
service port.
Reset the operation using the remote controller,
and then restart the operation.
Are the
characteristics of the
low pressure sensor
normal?
(See
∗
1.)
Check if the
“low pressure” value and
the actual measurement value
by pressure sensor are
the same.
Replace the low pressure sensor.
· The low pressure sensor is normal, and the pressure
detected with the PC board is also normal.
· The low pressure has really become low.
Referring to information on P351, remove the
causes by which the low pressure has become low.
∗
1: Make a comparison between the voltage of the pressure sensor and that read by the
pressure gauge.
(As to the voltage of the pressure sensor, make measurement of voltage at the
connector, and then convert it to pressure according to information on P419.)
∗
2: Make measurement of voltage of the pressure sensor.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Replace main PC board
(A1P).
NO
Connect the service checker to compare the “low pressure”
value and the actual measurement value by pressure sensor
(Refer to
∗
1) by using the service checker.
Service Checker
+5V
(4)
(3)
(2)
(1)
Connector for low pressure sensor
Micro controller
A/D input
Make measurement of DC voltage between these wires.
(Blue)
Red
Black
White
Low
pressure
sensor