BERG DRYBERG RF Operating And Maintenance Manual page 38

PROBLEM
H Compressor protection trips.
I Electronic board off even if
main power switch is on
("I").
J Temperature probe fault
alarm (see heading 9.2
"Alarms table").
K Alarm relative to the
microprocessor or its
Eeprom memory
(see heading 9.2 "Alarms
table").
CAUSE
H1 Compressed air flow or
temperature too high
combined with high ambient
temperatures.
H2 Compressed air flow or
temperature too high
together with insufficient
charge in refrigerant circuit
(see also A9).
H3 See points G1 to G8.
I1 Damaged circuit board.
J1 Probe in open circuit or in
short circuit.
K1 Control board
microprocessor initialising
error or microprocessor
mistake in reading data.
SYMPTOM
H1.1
• The head and the body of the
compressor are very hot;
• the compressor stops and
tries to restart after a short
time (even a few seconds)
I1.1 Power on the circuit
board terminals.
J1.1
• Refrigerant compressor
stops;
• main alarm relay tripped
(if present on the controller
fitted on the unit, see
Chapter 7 "Electronic
controller RF ").
K1.1 The alarm signal relative
to the problem is
displayed on the
electronic board
(see heading 9.2 "Alarms
table") and the unit is
blocked.
REMEDY
Stop the unit and reduce the air
flow and temperature to within
rated limits. Wait a few minutes
before starting the unit again.
Use special attention to check
operation of the safety devices
present (thermal protections
incorporated in the motors and/
or external and high pressure
switch, if present).
In case of doubt, replace all the
devices.
Call in a qualified refrigeration
engineer to check for leaks and
eliminate them.
Have the circuit charged by a
qualified refrigeration engineer.
Use special attention to check
operation of the safety devices
present (thermal protections
incorporated in the motors and/
or external and high pressure
switch, if present).
In case of doubt, replace all the
devices.
Use special attention to check
operation of the safety devices
present (thermal protections
incorporated in the motors and/
or external and high pressure
switch, if present).
In case of doubt, replace all the
devices.
See also points from G1 to G8.
Renew circuit board (contact a
specialized service centre).
Check that the temperature
probe is correctly connected to
the control board terminals and
that the cable is undamaged.
If necessary replace the
temperature probe.
Turn the unit off and on. If this
doesn't solve the problem,
contact the nearest service
centre.