BERG DRYBERG RF, Operating And Maintenance Manual

Page: 33 / 42

C
HAPTER
13
TROUBLE SHOOTING
NOTE
The following Trouble Shooting table is of a general nature for DEiT units equipped with the RF controller.
PROBLEM CAUSE SYMPTOM REMEDY
A Dew-point temperature
higher than expected. A1 Compressed air to be dried
temperature too high. A1.1
• Dew-point and compressed
air inlet temperatures higher
than expected;
• the alarm signal concerning
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
”).
Reduce the compressed air inlet
temperature within design
limits.
A2 Compressed air flow to be
dried too high. Take steps to reduce the
compressed air flow rate within
the design limits.
A3 Compressed air pressure to
be dried too low. Take steps to restore the air
working pressure within the
design limits.
A4 Air-cooled dryers: Ambient
temperature too high. If the unit is installed indoors,
reduce ambient temperature to
within rated limits, e.g.
installing fans to extract the air.
A5 Water-cooled dryers:
cooling water temperature
too high (low water flow). Take steps to reduce the water
inlet temperature within the
design limits (increase the water
flow).
A6 Air-cooled dryers:
Condenser fins fouled. Clean the condenser.
A7 Air-cooled dryers with
three-phase power supply:
fan running in reverse. Invert the position of two of the
three phases of the power
supply.
A8 Water-cooled dryers:
surface of exchanger pipes
dirty. If the cooling circuit
uses mains water or it is an
open circuit with cooling
towers the concentration of
calcium carbonates and
magnesium in the water
may reach such levels as to
cause the formation of scale
on the hot walls of the
exchanger tubes (the higher
the condenser outlet water
temperature the greater the
probability that scale will
form). Clean the surfaces of the pipes
with a descaling solution that
does not react with steel or
copper.