Product and functional description,
continued
Set points at
increasing
temperatures
The following set points are according to the control strategy when the temperature is
increasing
:
Description
Internal temperature
Fan speed
Internal fan
Below 20 °C
20 °C – 30 °C
Between 30 °C – 50 °C
Over 50 °C
Off (0)
Low (1100)
Between low and high (1100-1920)
High (1920)
External fan
Below 30 °C
30 °C – 35 °C
Between 35 – 55 °C
Over 55 °C
Off (0)
Low (1100)
Between low and high (1100-1850)
High (1850)
Set points at
decreasing
temperatures
The following set points are according to the control strategy when the temperature is
decreasing
:
Description
Internal temperature
Fan speed
Internal fan
Over 50 °C
Between 50 – 30 °C
30 °C – 18 °C
Below 18 °C
High (1920)
Between high and low (1920-1100)
Low (1100)
Off (0)
External fan
Over 55 °C
Between 55 – 35 °C
35 °C – 28 °C
Below 28 °C
High (1850)
Between high and low (1850-1100)
Low (1100)
Off (0)
Two separate air
flows
The two airflows (internal/external) are totally separated. The external air is only used to
cool down the internal air via the counter flow recuperator. The air flows are never
mixed.
Internal air flow
The warm internal air is sucked from the base station into the internal fan at the top of
the HEX 6 A and let through the recuperator, where it is cooled down.
After the cooling in the recuperator the air is let back into the base station.
External air flow
The cold external air is sucked into the external fan at the bottom of the HEX 6 A and
let through the recuperator, where it is cooling down the internal air.
After having passed through the recuperator the air is let back to the external
environment at the top of the unit.
6
