BERG DRYBERG RF Operating And Maintenance Manual page 35

PROBLEM
D Presence of water
downstream from dryer.
CAUSE
D1 The piping of the
distribution line is located in
a cold environment
(temperature lower than the
pressure dew-point of the
compressed air) and is not
insulated.
In this case, condensation
forms on the internal
surfaces of the piping.
D2 The compressed air flow
and/or the pressure are out
of their rated limits. 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 it 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.
Refer also to A2 and A3.
SYMPTOM
D1.1 Dryer runs normally.
Problems are caused by
external factors.
D2.1
• Dew-point and compressed
air inlet temperatures higher
than expected;
• the alarm signal associated
with the problem is displayed
on the controller panel (see
heading 9.2 "Alarms table");
• main alarm relay tripped
(if present on the controller
fitted on the unit, see
Chapter 7 "Electronic
controller RF ").
• Dew-point and compressed
air inlet temperatures higher
than specified values.
REMEDY
Insulate the piping exposed to
low ambient temperatures.
Reduce the compressed air flow
and pressure to within rated
limits. If necessary, position the
dryer upline from the air
receiver or increase the capacity
of the air receiver.