Refrigerant Circuit Functional Principle - Pfannenberg Premium Controller X Serie Instrucciones De Servicio

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2.4.3

Refrigerant circuit functional principle

Item Designatino
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 (6) draws the air from inside the switch cabinet out 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.
The following values are set in the condition as supplied from the factory:
• The switch cabinet temperature setpoint is 35°C.
• The maximum switch cabinet temperature is 50°C.
• The minimum switch cabinet temperature is 15°C.
• Unit of the switch cabinet temperature °C
Operating Manual DTS and DTI 6X1E Premium Controller X-Series (XC) 086100018 © Pfannenberg GmbH
5
3
2
1
Figure 4 - Refrigerant circuit
Item
2
4
6
6
4
7
Designatino
Liquefier
Evaporator
Evaporator fan (internal)
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