EN
UAB AMALVA we reserve the right to make changes without prior notice
6
D2-18-01
• To maintain a good indoor climate, comply with regulations and, to avoid condensation damage, the unit
must never be stopped apart from during service/maintenance or in connection with an accident.
• If the unit is placed in spaces with high humidity, condensation might occur on the surface of the unit when
outdoor temperatures are very low.
• Under conditions, when the outdoor air temperature is low and humidity is high, risk of heat exchanger
frosting may appear. For this reason anti-frost protection function is foreseen in the controller of the Kom-
fovent air handling units. Depending on the type of the recovery, different methods of anti-frost protection
are available: cold air by-passing, or / and supply air fan speed reducing. For extremely low outdoor air
temperature the duct mounted preheater is recommended. Counter cross flow heat exchanger is the mostly
sensitive for low outside air temperatures, as the risk of frosting appears in the temperature range from
0 to -5 °C and below. Standard aluminium cross-flow plate heat exchanger has better features, as the risk
of freezing appears only at -10 °C. The lowest risk and the highest resistance to cold outside air is a com-
petitive feature of the rotary heat exchanger, as it is not freezing even at the temperatures of -30 °C if the
humidity level of the air is appropriate.
• Selecting the management without pre-heater, but with cold air bypass the unit must be additionally
equipped with a secondary duct mounted heater.
During air handling unit operation the process of condensation could be caused because of cold outdoor air
or due to high ambient air humidity (3 picture).
Indoor humidity
35
30
25
20
15
10
Indoor t
emper
atur
e, °C
10% 20% 30% 40% 50%
60%
70%
80%
90%
100%
Outside temperature, °C
-25 -20 -15 -10
-5
0
5
10
3 picture. Condensation on unit surface diagram
