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regarding a certain purpose always require a special written agreement.
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Problem Description / Reason Correction
Cold room temperature too
high.
The upper alarm
limit for temperature
monitoring was ex-
ceeded by the delay
time of the tempera-
ture alarm.
If the temperature continues to be above the alarm limit after acknowledg-
ment of the fault, the delay time will start over.
Check whether the doors are closed and the machine is cooling. You may read
the current detector values under the menu item “Information”. If the package
detector reads below room temperature, the machine is cooling.
Check whether too many warm items were brought in for storage.
Is the evaporator icy? Initiate manual defrosting and afterwards check if the
evaporator is free of ice.
Is the alarm limit to close to the hysteresis?
Is the delay time set too short?
Check, if the cold-water circulation (with devices with plate heat exchanger) is
working correctly. Check if the air heat exchanger is supplied with enough cold
air (air exchange).
Cold room temperature
too low.
The lower alarm limit
was under-run by
more than the set
alarm delay time.
Check the temperatures in the cool room. Was the temperature adjusted
lately?
Were large amounts of goods brought in that had a signi cantly lower tempe-
rature?
Refrigeration unit constant-
ly runs and the evaporator
is icy.
Due to in ow of
warm moist air,
a crust of ice is
building up on the
evaporator.
Are the siphons lled with water?
Initiate manual defrosting and watch whether the evaporator is free of ice after
the process is complete.
If it is not,
- The defrosting cycle is too long and the defrosting time is set too short.
- The defrosting limitation temperature is set too low and prematurely turns o
the defrosting process.
- Check whether the door closes correctly and is air-tight. Adjust if necessary.
- Check whether the pressure compensation valve is ok.
- Check whether the pressure compensation flap closes properly
- Check whether the filter fleece is correctly positioned
- Check whether the package detector is correctly positioned (not touching
the evaporator tubes)
- Check whether moisture has infiltrated through the delivery of goods or per-
sonnel movements
- Check whether the cell environment is extremely damp (vapour pressure)
Door open. The signal input for
the door contact
switch is open.
The door was opened for longer than released by the monitoring time. If this is
not the case:
Is the door contact switch installed and activated by the door?
If the door contact switch is not installed, the position “Door Contact Switch” in
the “Settings” menu / “Alarm Limit Values” must be set to “No”.
In this menu you may also set the alarm time for the door.
Prevent leaving the doors open for long periods as this leads to ice formation
on the evaporator and the cell.
Emergency operation. The display reads
“emergency opera-
tion”.
The emergency operation was turned on via the DIL switch on the main
board. The machine will continue running without temperature control and
defrosting. The refrigeration specialist must be contacted immediately or was
contacted to perform maintenance.
If the condenser, evaporator and/or condenser fan are not running and the
solenoid valve for the uid line has been actuated, a damage on the PCB is pre-
sent which prevents the selection. The emergency run is then also no longer
ensured.
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