NANO NXC 0020, User Manual

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28
cycling refrigerated air dryer
R
1
problem cause symptom solution
A. Dew point
too high
Compressed air temperature too
high
The digital display panel indicates
a value > 50°F permanently.
Return the air inlet temperature to
within the limits.
Compressed air flow rate too high Same as above
Correct the air flow rate to within the
limits of the dryer.
Compressed air pressure too low Same as above
Correct the pressure to within the
limits.
Ambient temperature too high Same as above
Correct the temperature to within
the limits. (R134a unit, limit is 122°F,
R407c unit, limit is 110°F)
Dirty fins of the condenser Same as above Clean the condensing unit fins.
Condensing unit face clogged Same as above Clean the condensing unit face.
The fan runs backwards
(three-phase)
Same as above
Correct electrical connection (phase
inversion)
Refrigerant gas leak
The compressor runs all the time.
The compressor top is very hot.
Find the leak and repair it.
The HP pressure switch has tripped. The digital display panel is OFF. See note E.
B. Excessive drop
in compressed
air pressure
Compressed air flow rate too high
Pressure downstream from the
dryer lower than the expected
value.
Reduce the compressed air flow rate.
Condensate frozen
Pressure downstream from the
dryer lower than the expected
value.
See note C.
Exchanger Tubes soiled by
impurities in the compressed air.
Pressure downstream from the
dryer lower than the expected
value.
Wash the heat exchanger tubes with
a non-aggressive detergent solution.
Check the filter upstream from the
dryer.
C. Compressed air
does not flow
through the dryer.
The condensates have frozen and
block the passage as the
probe is incorrectly positioned.
Compressed air does not flow
through the dryer.
Position the probe in the center of the
DTM heat exchanger.
The condensate have frozen and
block the passage as the set
point is programmed too low.
After the starting the
compressor, value 0 is reached
in less than 2 minutes.
Increase the set point value.
The condensate have frozen and
block the passage as the
electronic controller has failed.
The compressor stops.
The compressor does not stop
even if the Carel indicates 0
several minutes.
See note H.
Change the Carel.
2.13 trouble shooting