Komfovent Domekt CF 250 F, Инструкция по установке и обслуживанию

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EN
UAB KOMFOVENT we reserve the right to make changes without prior notice
D_20-07
6
• 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 air handling unit, different methods of anti-frost
protection are available: cold air by-passing, supply air fan speed reducing and/or integrated preheater.
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 competitive feature of the rotary heat exchanger, as it is not freez-
ing even at the temperatures of -30 °C if the humidity level of the air is appropriate.
In the units with counter flow or cross flow plate exchangers without inte -
grated preheater, it is necessary to install additional duct mounted pre-
heater in the outside air intake duct, which will ensure temperature of the
intake air higher than -4 °C.
• Selecting the management without pre-heater, but with cold air bypass the unit must be additionally
equipped with a secondary duct mounted heater.
If the unit is mounted in premises with high humidity, condensation might occur on the surface of the unit
when outdoor temperatures are low (see picture 3). When installing unit in such a premises, it is necessary
to take additional measures, to avoid condensate damage to the building construction elements or furniture.
Relative humidity of the premises where the unit is mounted, %
80
75
70
65
60
55
50
45
40
35
30
25
20
12 14 16 18 20 22 24 26 28 30 32
Air temperature of the premises where the unit is mounted, °C
Outdoor air temperature, °C
10
5
0
-5
-10
-15
-20
-25
3 picture. Condensation on unit surface diagram