Cold Room Temperature Too High; Cold Room Temperature Too Low; Refrigeration Unit Constantly Runs And The; Door Open - Viessmann EVO-COOL Series Installation And Operating Instructions Manual

GB
Problem
Cold room temperature too
high.
Cold room temperature
too low.
Refrigeration unit constant-
ly runs and the evaporator
is icy.

Door open.

Emergency operation.
General notice (liability): the details of this technical documents serve for description. Consents regarding the availability of certain features or
regarding a certain purpose always require a special written agreement.
Page 64 GB
Description / Reason Correction
The upper alarm If the temperature continues to be above the alarm limit after acknowledg-
limit for temperature ment of the fault, the delay time will start over.
monitoring was ex- Check whether the doors are closed and the machine is cooling. You may read
ceeded by the delay the current detector values under the menu item "Information". If the package
time of the tempera- detector reads below room temperature, the machine is cooling.
ture alarm. 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).
The lower alarm limit Check the temperatures in the cool room. Was the temperature adjusted
was under-run by lately?
more than the set Were large amounts of goods brought in that had a signifi cantly lower tempe-
alarm delay time. rature?
Due to infl ow of Are the siphons fi lled with water?
warm moist air, Initiate manual defrosting and watch whether the evaporator is free of ice after
a crust of ice is the process is complete.
building up on the If it is not,
evaporator. - 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 off
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)
The signal input for The door was opened for longer than released by the monitoring time. If this is
the door contact not the case:
switch is open. 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.
The display reads The emergency operation was turned on via the DIL switch on the main
"emergency opera- board. The machine will continue running without temperature control and
tion". 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 fl 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.
Right reserved to make technical changes!