NANO NXC 0020, User Manual

Page: 29 / 64

29
cycling refrigerated air dryer
R
1
problem cause symptom solution
D. Condensate
present
downstream
from the dryer
The solenoid valve coil has failed.
No condensates or air are
expelled when the down button
is pressed.
Replace the solenoid valve coil.
The purge circuit is clogged. The purge filter is dirty. Clean the filter.
The solenoid purge valve opening
time is insufficiently long time.
No condensate or air are
expelled when the purge
button is pressed.
Increase the duration for which
the solenoid purge valve opens.
Solenoid valve plug clogged
No condensate or air are
expelled when the purge button
is pressed.
Clean the solenoid valve.
The relay on the Carel which
controls the solenoid valve
does not function.
Use a voltmeter to check if the
relay contacts do not close when
the purge button is pressed.
Replace the electronic board if
the relay does not function.
Distribution network pipework
is in a “cold” environment in which
the temperature is lower than the
dew point temperature of the
compressed air under pressure
and the tubes are not lagged. In
this case, condensate form on
the internal surfaces of the pipes.
The dryer functions
problem-free.
The cause of the problem
is external.
Lag the pipework in “cold”
environments.
E. HP pressure
switchcuts in
(manual)
The motorized fan does not
function.
The Carel’s regulator is OFF as
if the power supply had failed.
Repair or replace the fan. Press
the red re-set button on the
pressure controller.
Ambient temperature too high.
Ambient air temperature
conditions higher than
maximum authorized value
Return the ambient temperature
to within the limits by, for
example, increasing room
ventilation. Press the red re-set
button on the pressure controller.
Recirculation of hot air due to
incorrect installation.
Very high temperature in room
Modify the position of the
machine or the obstructions to
eliminate air recirculation. Press
the red re-set button on the
pressure controller.
Condensing unit fins dirty.
The digital display panel
continuously indicates a value
> 39.2°F.
Clean the condensing unit fins.
Press the red re-set button on the
pressure controller.
Condensing unit grill clogged.
The digital display panel indicates
a value > 39.2°F continuously
Clean the condensing unit front
face. Press the red re-set button
on the pressure controller.
Relatively high ambient
air Temperature and fan turning
in wrong direction (if three-
phase power supply).
Cooling air passes first
passes through the fan and
then through the condensing unit.
Reverse two machine power
supply phases.
Press the red re-set button on the
pressure controller.
Compressed air flow rate or
temperature too high and high
ambient temperatures at the
same time.
High dew point (which means a
high evaporation pressure of raised
and higher purging from
the separator).
Correct the temperature and the
air flow to pre-set limits.
Press the red button on the
Pressure switch cap.