Daikin VRV III REYQ10PY1, Service Manual

Page: 267 / 452

Troubleshooting by Indication on the Remote Controller Si37-701
256 Troubleshooting
Troubleshooting
Ensure correct connection.
Ensure correct connection.
Replace the compressor.
Conclude the work
There is a possibility of defect
of pressure equalizing.
Check the refrigerant circuit.
Defect of pressure equalizing
Check the refrigerant circuit.
Replace the connecting wires and
ensure right connection of the
connector.
Local factor
Open the stop valve.
NO
NO
NO
NO
YES
NO
YES
NO
YES
NO
NO
NO
YES
YES
YES
YES
Check if
the stop valve is
open.
Power OFF
Power ON
Check if
the relay wires to the
compressor are
correct.
Check if the
connection of UVW
phase order is
correct.
Check if
the wiring is the
same as in the electric
wiring diagram.
The compressor
coil has disconnection
of wires.
Restart and
check the operation.
Check if the condition
occurs again.
Check if
the start mode is in
the high differential pressure
(not less than
0.5 MPa).
Check
if the inverter
output voltage between 3
phases is within
± 5V.
The insulation
resistance of the compressor
is low (not more than
100k
Ω
).
YES
YES
U
V
W
Check if the wiring has
any error in mistake for
inverter compressor.
Remove the connection between
the compressor and inverter. Set
the power transistor check mode
ON using “Setting mode 2” of the
outdoor unit PC board.
Measure the inverter output voltage
(
∗
2).
Note: Measurement should be made
while the frequency is stable.
Replace the inverter PC board.
Replace the inverter compressor.
∗
1: Pressure difference between high pressure and low pressure before starting.
∗
2: The quality of power transistors/ diode modules can be judged by executing Check 4 (P349).
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.