Pfannenberg DTI 6X2E Instructions D'utilisation page 50

GB
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 6X2E Premium Controller X-Series (XC) 086100099e © Pfannenberg GmbH
5
2
1
Figure 4 - Refrigerant circuit
3
6
Item Designatino
2 Liquefier
4 Evaporator
6 Evaporator fan (internal)
4
7
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