A9
No refrigerant fluid in the
circuit. If you are in doubt
concerning the refrigerant
charge level, measure the
manometric temperature
(pressure) on the refrigerant
compressor suction side
using the Schraeder valve
provided. Gradually change
the airflow through the
dryer in such a way that the
dryer operates without
capacity steps; the
manometric temperature
(read on the temperature
scale of the refrigerant
utilized) must vary from
approximately -3 °C
(26.6 °F) to 0 °C (32 °F);
if the manometric
temperature is lower than
these values the circuit
probably contains
insufficient refrigerant.
A9.1
• Compressor doesn’t stop even
if there is a little air flow;
• frosting on the evaporator
capillary inlet;
• power absorption lower than
expected;
• also see
A1.1
Call in a qualified refrigeration
engineer to check for leaks and
eliminate them. Have the circuit
charged by a qualified
refrigeration engineer.
A10
Solenoid valve on the low
pressure line not functioning
correctly.
A10.1
See
A1.1
Check operation of the solenoid
valve. If necessary, renew the
solenoid valve coil or the entire
solenoid valve.
B
Excessive air pressure drop.
B1
See
A2
and
A3
.
B1.1
• Dew-point temperature
increased (see
A1.1
);
• pressure downstream of the
dryer lower than expected.
Reduce the compressed air flow
and pressure to within rated
limits.
B2
There is an increase in the
pressure drop and the dryer
freezes.
B2.1
See point
C
.
See point
C
.
B3
Exchanger obstructed by
impurities entrained by the
compressed air.
B3.1
Pressure down-line from
the dryer lower than
expected.
Renew the exchanger.
C
The dryer is obstructed and
the air does not flow.
C1
Incorrect position of
temperature probe so the
thermal mass has fallen
below zero thereby freezing
the condensate (it may have
occurred that following
maintenance work carried
out inside the dryer the
temperature probe has
become dislodged)
C1.1
The value measured by
the probe remains above
0 °C (32 °F) even when
the compressor runs for
prolonged periods
(e.g. more than
10-15 minutes) without
any compressed air flow.
Correct the position of the probe
in the socket by inserting it
correctly.
C2
Incorrect setting or
malfunctioning of the
electronic controller or
alteration of the setpoint
(if required by the electronic
controller supplied with the
unit, see Chapter 7
“Electronic controller
RF
”) will cause ice
formation.
C2.1
The compressor fails to
stop even though the dew
point temperature is very
close to 0 °C (32 °F).
Increased the setpoint by 1 or
2 °C (1.8...3.6 °F) (if envisaged
by the electronic control unit
supplied with the unit, see
Chapter 7 “Electronic controller
RF
”). If this doesn’t solve the
problem, renew the control
board.
C3
Temperature probe not
calibrated.
C3.1
Apparently everything is
functioning correctly but
there is no air flow.
Use a tester to check the
impedance of the probe at
20 °C / 68 °F (the value should
be 12.1 k
:
.
Renew the probe if necessary.
PROBLEM
CAUSE
SYMPTOM
REMEDY