Daikin VRV S RXQ4/5ARV1, Service Manual

Page: 188 / 377

Symptom-based Troubleshooting SiAF332111E
182 Part 6 Service Diagnosis
2.2 For 6/8 HP Outdoor Units
Problem Measure
Decrease of main circuit power supply insulation
resistance (Less than 1 M

)
Define the measure using the flowchart below.
1 M
Ω
or more?
YES
YES
NO
NO
Decrease of main circuit power supply
insulation resistance
Cut the power supply.
Cut the power supply.
Defective local power supply
Normal
Remove the compressor wiring from the
power supply terminal. Isolate the wiring
and be careful not to touch the live parts.
Turn the power supply on and leave it on
for 6 hours (keep the compressor wiring
disconnected).
Connect the compressor wiring to the
terminal, or to the noise filter PCB and
measure the insulation resistance.
1 M
Ω
or more?
Measure the insulation resistance of the
main circuit power supply.
Check the local power supply.
Compressor abnormality
Replace the compressor.