Viessmann EVO-COOL Series Installation And Operating Instructions Manual page 18

GB
Submenu 1 Submenu 2
Type
Logging
Intervall
(optional)
Man.
Defrosting
defrosting
Defrosting
Defrosting
duration
Defrosting
cycle
Defrosting
temperature
Switching
point
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 54 GB
Presetting
Values
CS Cooler FS Freezer
Wall-han-
ging
unit Wall-
Wall-hanging
hanging
unit
Ceiling- unit
mounted
unit
1 min to
15 min 15 min
30 min
Yes / No No No
Defrost
cycle / Defrost
Defrost cycle
Defrost cycle
plan
1 min to
10 min 10 min
60 min
15 min to
4 h 2,5 h
24 h
0 to +40°C +12°C +12°C
+3°C to
+5°C +5°C
+40°C
Description
Wall-hanging unit: in the case of redundancy, all units in the bus
system simultaneously begin defrosting.
Ceiling unit: units begin defrosting separately.
Restart required on selection.
Time interval for the data logger. In the case of 15 min
recording interval, the ring buff er lasts for min. 2 years. The
data can be read out to an USB stick as well as viewed and
processed in
Microsoft® Excel or OpenOffice™
representation in the display, the time course is shown on a
daily basis and can be selected in a targeted fashion within a
specifi c day.
Time limitation for defrosting in a cycle.
Selection parameters for the defrost function
Defrost cycle: At a predetermined interval of the defrosting
operation is started.
Defrost plan: By setting the shift points for the defrost de-
frosting can be performed for well-defined periods.
Defrosting must be programmed for a week. For 99 swit-
ching points are available. When changing the defrost to
restart the system is required.
Time limitation for defrosting in a cycle.
Defrosting cycle: the defrosting process starts at a specified
interval.
Example:
Every 2h defrosting cycle for a duration of 30 minutes
=> at 2:00 pm, defrosting is performed for 30 minutes,
at 4:00 pm, defrosting is performed for 30 minutes,
at 6:00 pm, defrosting is performed for 30 minutes.
For limitation on defrosting, the defrosting limitation
temperature is also applied. Thus, defrosting is performed
for a maximum period of 30 minutes or until the defrosting
limitation temperature is reached. It is better to defrost the
units quickly and often than to have a long cycle period and
a long defrosting process.
The defrosting limitation temperature is measured in the
evaporator. For switching off , the defrosting duration (time
in min) or the temperature is used. Whichever value is
reached sooner.
If no defrost termination probe is available, only the time
is considered and the process is fi nished after running the
defrosting sequence.
Switchover between hot gas and fan-only defrosting.
The temperature specifi es up to which temperature the
defrosting is only performed with the evaporator fan. Under
this temperature, defrosting is performed by the use of hot
gas or electric heating, respectively. Above this temperature,
the ice layer on the evaporator is melted away for cooling of
the room. For that purpose, the evaporator probe must not
be fully frosted. Defrosting using the fan should ideally only
occur for chiller rooms.
Right reserved to make technical changes!
. In the graphic