Pfannenberg DTI 6301C Betriebsanleitung Seite 48

GB
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 6201C / 6301C Standard Controller (SC) 086100017c © Pfannenberg GmbH
5
2
1
Figure 6 - Refrigerant circuit
3
6
Item Designation
2 Condenser
4 Evaporator
6 Evaporator fan (internal)
4
7
Page 9 / 39