Troubleshooting (Inverter) Si33-105
198 Troubleshooting R407C PLUS Series Heat Recovery System
5.4 Outdoor Unit: Inverter Stall Prevention, Compressor
Lock
Remote
Controller
Display
L9
Supposed
Causes
!
Defect of compressor
!
Pressure differential start
!
Defect of inverter unit
Troubleshooting
Inverter
output voltage
check
Inverter output
voltage is not balanced.
(Normal if within ±8V)
(Note) Must be
measured when
frequency
is stable.
Unsatisfactory pressure
equalization
Check refrigerant system.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor.
YES
Replace the inverter unit.
NO
NO
Reset and restart.
NO
The difference
between high and low
pressure when starting is
2kg / cm
2
= (0.196
MPa).
YES
YES
Disconnect the connection
between the compressor and
inverter.
After turning
on again, "L9" blinks
again.
(VF066)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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