IV Produkt Envistar Top 04-21, Эксплуатация и обслуживание

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Page 14
Operation and Maintenance
Envistar Top 04-21
DSET.190501.01.EN
Continuous product development may give rise to specification changes without notice.
1 Compressor
2 Condenser
3
Extract air fan
4 High pressure switch
5 Measurement outlet – high pressure
6 Drying filter
7 Expansion valve
8 Evaporator
9
Supply air fan
10 Measurement outlets – low pressure
11 Low pressure control
12 Control unit
13 Suction gas sensor (temp after evaporator)
14 Pressure sensor – low pressure
1 Compressor
2
Hot gas sensor
3 Condenser
4
Extract air fan
5 High pressure switch
6 Pressure sensor - high pressure
7 Measurement outlet – high pressure
8 Drying filter
9 Expansion valve
10 Evaporator
11
Supply air fan
12 Measurement outlets – low pressure
13 Control unit
14 Suction gas sensor (temp after evaporator)
15 Pressure sensor – low pressure
Cooling circuit function
From the compressor, the refrigerant is compressed as hot gas to the condenser, where heat is emit-
ted. The refrigerant condenses from gas to liquid when it is cooled by the extract air.
The refrigerant passes the pressure reducing expansion valve and undergoes a phase transformation
in the evaporator from liquid to gas (the refrigerant evaporates).
Inside the evaporator, 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, where it is compressed and
thus heated. The gas is also used for cooling the compressor’s electric motor. The refrigerant now con-
tains the heat from the supply air, the compressor’s motor heat and the compression heat.
15
13
14
10
4 11
2
12
5 6
1
9
7
8
3
Flow chart for refrigerant system size 04-12
14
12
13
8
3 9
11
10
4
1
7
5
6
2
Flow chart for refrigerant system size 16 - 21