Checking The Inverter For Damage During Compressor Operation - Mitsubishi Electric PUHY-P200 Service Handbook

[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 after the inverter output fre-
quency has stabilized.
<INV20Y>
HWE14040
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
- 267 -
Remedy
a. Check items 8-9-2 through 8-9-4
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.
GB