Daikin VRV RXYQ72-384XAYCA, Service Manual

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SiUS342004EB Troubleshooting by Error Code
Part 6 Service Diagnosis 320
Note(s)
Troubleshooting
Is supply
voltage imbalance over
approximately
12 V? (
∗
1)
Correct the open phase of
power supply. Open phase?
Is the
imbalance of voltage
applied to the inverter over
approximately
12 V? (
∗
2)
Rectify the power supply
voltage imbalance.
Take countermeasures (listed
below).
YES YES
NO NO
NO
Take countermeasures.
Defective noise filter, magnetic
relay, or wiring
Turn OFF the power supply,
and then check and repair
wirings in the main circuit and
defective components.
(1) Loose contact and wiring
disconnection between the
power supply and the
inverter
(2) Adhesion, meltdown, or
loose contact of magnetic
relay
(3) Wiring disconnection in or
loose contact of noise filter
Replace the inverter PCB
(A4P).
YES
Explanation to users
∗
Use the document “Notice of Inspection Results” attached to spare part.
Hand the “Notice of Inspection Results” to user to ask
him/her to rectify the imbalance.
Be sure to explain user that “power supply
voltage imbalance” will occur and Daikin
accepts no responsibility for the imbalance.
Use equipment capable of constantly
recording power supply voltages (e.g.
Memory HiCorder) to record power
supply voltages between phases (R-S,
S-T, and R-T) for a period of
consecutive 1 week.
Power supply voltage imbalance
Even though power supply voltage
remains balanced when making
measurement, it often becomes
imbalanced during night-time (from
6:00 PM to 10:00 PM).
Even though the power
supply voltage is normal, the
error recurs.
<If voltage can be monitored>
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
 1. Make measurement of voltage at the power supply terminal block (X1M).
 2. Make measurement of voltage at the L1, L2 and L3 terminals of diode module
located on the inverter PCB during the compressor is in operation.