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[8-9 Troubleshooting Inverter Problems ]
8-9-5
Checking the Inverter for Damage during Compressor Operation
Items to be checked
Put the outdoor unit into opera-
tion.
Check the inverter output volt-
age (at the compressor terminal)
after the inverter output frequen-
cy has stabilized.
<INV42Y and INV38>
8-9-6
Checking the Fan Motor for Ground Fault and Coil Resistance Problems
Items to be checked
Remove fan motor winding. Check
insulation resistance and coil resis-
tance.
34
- chapter 8
Phenomena
1)
Overcurrent-related problems occur im-
mediately after compressor startup.
Error code : 4250
Detail code : 101, 102, 106, 107
2)
There is a voltage imbalance between
the wires after the inverter output voltage
is stabilized.
Greater than the larger of the following
values: imbalance of 5% or 5V
Phenomena
1)
Fan motor insulation failure.
If < 1 M , Defect.
2)
Fan motor wire failure.
Target coil resistance: Approx. 10 .
(Changes with temperature)
Remedy
a.
Check items [8-9-2 Checking the
Inverter Board Error Detection Cir-
cuit]through [8-9-4 Checking the
Inverter for Damage at No-
Load]for problems.
b.
Check that high and low pressures
are balanced.
c.
Check that no liquid refrigerant is
present in the compressor and that
there is no liquid backflow.
Go to "d." when the problem per-
sists after compressor startup was
repeated several times.
d.
Check that there is a pressure dif-
ference between high and low
pressures after compressor start-
up.
Check the high pressure with
LED monitor for changes.
Replace the compressor if there is
no pressure difference. (the com-
pressor may be locked.)
Replace the INV board if there is a volt-
age imbalance.
Check the belt heater for problems if
there is no voltage imbalance.
When the error occurred, liquid refrig-
erant may have been present in the
compressor.
Remedy
Change fan motor.
Change fan motor.
HWE18240_GB
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