Daikin FCQ35B7V1 - Page 222

Additional Checks for Troubleshooting ESIE05-04
3–60 Part 3 – Troubleshooting
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4.8 Checks
4.8.1 Clogged Points
Temperature differences must occur before or after the clogged points!
Check points Check factor Causes Remedies
1 Around
expansion
mechanism
Temperature
difference
Q Dust
Q Choked moisture
Q Reduced effective pipe
diameter due to adherent
contamination, etc.
Replace the expan-
sion valve.
2 Accumulator Frosting
Q Choked moisture Blow a nitrogen gas,
and then replace the
refrigerant.
3 Distributor Temperature
difference
Q Dust
Q Choked moisture
Q Reduced effective pipe
diameter due to adherent
contamination, etc.
Replace the heat
exchanger or
distributor.
4 Field piping Temperature
difference
Q Collapsed pipe Replace the pipe.
5 Stop valve Temperature
difference
Q The stop valve is not fully
open.
Open the stop valve
fully.
RAC
Indoor Unit Outdoor Unit
COMP
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