Service manual

ESIE03–01 Additional Checks for Troubleshooting
Part 3 – Troubleshooting 3–83
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5.13 Check for Clogged Points
Checks Temperature differences must occur before or after the clogged points!
Check points Check factor Causes Remedies
1 Around
expansion
mechanism
Temperature
difference
P Dust
P Choked moisture
P Reduced effective pipe
diameter due to adherent
contamination, etc.
Replace the expan-
sion valve.
2 Accumulator Frosting P Choked moisture Blow a nitrogen gas,
and then replace the
refrigerant.
3 Distributor Temperature
difference
P Dust
P Choked moisture
P Reduced effective pipe
diameter due to adherent
contamination, etc.
Replace the heat
exchanger or
distributor.
4 Field piping Temperature
difference
P Collapsed pipe Replace the pipe.
5 Stop valve Temperature
difference
P The stop valve is not fully
open.
Open the stop valve
fully.
RAC
Indoor Unit Outdoor Unit
COMP
1
2
33
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