Operation and Maintenance Instructions
NEW EcoCooler
DSKE180401.00.EN
Page 7
Continuous product development may give rise to specification changes without notice.
Cooling circuit function
Most cooling units operate according to the same principle. The cooling unit
moves the heat in the air from a location where the heat is unwanted or unneed-
ed, to another location where the heat can be emitted.
From the compressor (position 1) the refrigerant is pressed as hot gas to the
condenser (position 2) where heat is emitted. The refrigerant condenses from
gas to liquid when it is cooled by the extract air.
The refrigerant passes the pressure reducing expansion valve (position 7) and
undergoes a phase transformation in the evaporator (position 8) from liquid to
gas (the refrigerant evaporates).
Inside the evaporator (position 8), the refrigerant absorbs the heat required for
phase transformation. The heat is taken from the supply air which is thus cooled.
The cold refrigerant in gaseous form is drawn back into the compressor (position
1) where it is compressed and thus heated. The gas is also used for cooling the
compressor’s electric motor. The refrigerant now contains both the heat from the
supply air, the compressor’s motor heat and the compression heat.
14
12
13
8
3
9
15
10
4
11
1
7
5
6
2
Flow chart for EcoCooler refrigerant systems (for refrigerant volume, see the type label on the unit)
1
Compressor
9
Supply air fan
2
Condenser
10 Measurement outlets – low pressure
3
Extract air fan
11 Liquid line sensor
4
Pressure switch – high pressure
12 Control unit
5
Measurement outlet – high pressure
13 Temperature sensor suction gas
6
Drying filter
14 Pressure sensor – low pressure
7
Expansion valve
15 Hot gas sensor
8
Evaporator
