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Operation and Maintenance
Envistar Top 04-21
DSET.220501.07.en
Continuous product development may give rise to specification changes without notice.
Cooling circuit function
A cooling system has four basic components: evaporator, condenser, expansion
valve and compressor.
The compressor carries out the work required to run the cooling process. The
evaporator is located in the supply air for the unit. The heat from the outdoor air
is taken up in this coil, thereby cooling the supply air.
The energy supplied to the cooling system from the evaporator and the com-
pressor leaves the unit via the condenser in the extract air.
It is important to ensure that the air volumes are above the specified minimum
flow on both the outdoor air and extract air side. The process cannot work if
these air volumes are not available.
00024
15
13
14
10
4
11
2
12
5
6
1
9
7
8
3
Flow chart for refrigerant system size 04-12
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
