Refrigerant Circuit Functional Principle - Pfannenberg DTI Serie Manual De Instrucciones

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2.4.4

Refrigerant circuit functional principle

Item Designation
1 Compressor
3 Expansion valve
5 Condenser fan (external)
7 Electronic control with temperature sensor
The cooling units are comprised of various components; see the figure Refrigerant circuit.
 The compressor (1) compresses the refrigerant under high pressure. The temperature increases.
 This heat is released to the ambient air in the condenser (2). The refrigerant liquefies.
 The condenser fan (5) draws room air through the condenser (2) and releases it to the environment.
 A pressure drop occurs when the refrigerant passes through the expansion valve (3).
 Inside the evaporator (4), the refrigerant absorbs heat from the air inside the switch cabinet and evaporates.
The air inside the switch cabinet is cooled and dehumidified.
 The evaporator fan (internal) (6) draws the air inside the switch cabinet through the evaporator (4) and releases
the cooled air back to the switch cabinet.
 The cooling units are controlled with a temperature sensor (7). It detects the air temperature inside the switch
cabinet.
Operating Manual DTS and DTI 6401 / 6501 Standard Controller (SC) 086100007 © Pfannenberg GmbH
5
3
2
1
Figure 5 - Refrigerant circuit
Item
2
4
6
6
4
7
Designation
Condenser
Evaporator
Evaporator fan (internal)
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