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The alarm
(toC),
- ON/OFF cycles of the
compressor too
frequent –
has been triggered
The alarm
(ICE)
has been triggered
DMC51 - The LED
is ON or flashing
DMC51 - The LED
is ON or flashing
DRYPOINT® RA CT 20-500 NA
If ESS=YES (see section 8.12.7) - The refrigerating compressor must remain ON for
a minimum time (approx. 6 minutes) within which, if necessary, DMC51 will activate
the solenoid EVH that enables the operation of the hot gas by-pass valve. To avoid
freezing, if the DewPoint drops too low in despite the hot gas by-pass valve is in
operation, the compressor is switched OFF before its minimum ON time (approx. 6
minutes). If this happens too many times the alarm
damaging the compressor.
Check which of the following reasons has caused the alarm:
1. The inlet air is too cold – restore the nominal conditions.
2. The ambient temperature is too low - restore the nominal conditions.
3. The hot gas bypass valve is out of setting – contact a BEKO service technician to
restore nominal setting.
4. The solenoid valve EVH is not operating correctly - see specific point.
Check which of the following reasons has caused the alarm:
1. The inlet air is too cold – restore the nominal conditions.
2. The ambient temperature is too low - restore the nominal conditions.
3. The refrigerating compressor is always ON, even though the led
the electric wiring or KC relay (if installed) is faulty – replace it.
With
LED flashing: one or more alarms are active and the display shows
and the active alarms.
With
LED lit: one or more alarms are waiting to be reset and the display shows
and the alarms that are no longer active but not yet reset.
The alarms are displayed by the following messages:
1.
: LP - LPS pressure switch activated (low pressure) – see specific paragraph.
2.
: Hdt - Compressor discharge temperature too high (probe T2) – see specific
paragraph.
3.
: ICE - Temperature inside the exchanger too low (probe T1) – the dew point is
too low – see specific paragraph.
4.
: toC – ON/OFF cycles of the compressor too frequent – Compressor has been
repeatedly switched OFF before its minimum ON time (approx. 6 minutes) - see
specific paragraph.
5.
: PF1 - Failure temperature probe T1 (DewPoint) – verify electric wiring and/or
replace probe.
6.
: PF2 – Failure temperature probe T2 (compressor outlet) – If probe T2 installed :
verify electric wiring and/or replace probe; If probe T2 not installed : verify electric
wiring and/or replace the resistor R.
NOTE: after solving the problem, the alarms must be reset (simultaneously press
the
Set
+
buttons for three seconds).
With
LED flashing, one or more service warnings are active.
With
LED lit: one or more service warnings are waiting to be reset. The display
shows the dew point temperature and the active or not reset service warning.
The service warnings are displayed by the following messages:
1.
: Hdp - Dew point too high (higher than the set HdS value) – see specific
paragraph.
2.
: Ldp - Dew point too low – see specific paragraph.
3.
: SrV - Service - maintenance notification time expired (parameter SrV) – carry
out the scheduled maintenance and reset the hour meter.
NOTE: after solving the problem, the service warnings must be reset
(simultaneously press the
Maintenance, troubleshooting, spare parts and dismantling
Set
+
buttons for three seconds).
(TOC) is activated to avoid
is OFF – verify
37
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Table of Contents
Troubleshooting
