Defrosting Options; Defrost Water Drain; Preventing Excessive Defrost Water - Viessmann EVO-COOL Series Installation And Operating Instructions Manual

6.2

Defrosting options

Defrosting cycle
The defrosting process is continually triggered at set
intervals.
Defrosting plan
Defrosting is performed for well-defined periods. These
can include 99 periods will be specified in a week time.
Manual defrosting
The cooling process is interrupted and a complete de-
frosting process is conducted. The unit then re-activates
the cooling mode.
6.3

Defrost water drain

The defrost water created is caught in the defrost water
tray and largely evaporated by the evaporator loops.
In the event of large volumes of defrost water or high
humidity around the cell installation site, the use of
the evaporator may not be sufficient. In such cases, an
additional defrost water drain hose can also be attached
to the evaporator tray. The accessories kit is optionally
available and is compatible with all FS and CS series
units.
6.4

Preventing excessive defrost water

Defrost water is the melted ice formed by the evapora-
tor. In other words, the ice was formed through a use of
energy and likewise melted again. Due to the thermody-
namically induced lack of humidity at the coldest point
in the coldroom, ice formation cannot be prevented
(vapour pressure drop) but can be minimised.
The following points should be noted:
- Units in deep-freezing rooms should always be coupled
with a door contact switch that switches off the evapo-
rator while the door is open.
- Doors should remain open for as little time as possible.
If this is not possible, suitable measures must be taken
to minimise the loss of cold. This can include several
technical measures such as strip curtains, fast-sliding
doors, air curtain systems, pre-cooling rooms etc.
General notice (liability): the details of this technical documents serve for description. Consents regarding the availability of certain features or regar-
ding a certain purpose always require a special written agreement.
Page 49 GB
- The air flow should not be directed at the doors and
pressure compensation valves. Pressure compensation
valves must always be installed in a position where
they are barely influenced by the air flow.
- The goods introduced must be stored in sealed contai-
ners. Goods with high water content are subjected to
dehydration and thus damage. (Freezer burn on deep-
frozen goods and shrivelling/drying out of fresh foods)
- Do not leave deep-frozen goods in the warm storage
area on delivery. Defrost water will form on the surface
and have to be cooled again. In the case of cardboard
packaging, a great deal of moisture is absorbed in the
surfaces and causes the evaporator to freeze over when
the packaging is moved into the coldroom.
Right reserved to make technical changes!
GB