In this article, you can see what it is, what it is used for and the benefits of a Condensing Unit (CU). Now, let’s discuss the key points to consider when deciding which CU is best for each type of application.
1. Step 1: Available space
Researching and analyzing the available space is a very important point in choosing a condensing unit. Many CU’s are based on metal plates or “rails” and their dimensions are not standard in all cases, although the goal is always to seek standardization. Another key point regarding physical space is the family of compressors. The height of compressors varies from family to family, so care must be taken not to have problems when assembling them.
2. What is the capacity of the condensing unit?
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Thanks to the dimensional accuracy, you can choose a unit according to the capacity of your compressor development. This capacity depends on operating points such as temperature, evaporation, and condensation, which we will look at in more detail in the next step.
3 . Simultaneous selection of the CU application
The condensing unit needs to be selected according to the application, e.g. refrigerated cabinets and beverage fridges. One of the main items is the evaporation temperature required in the cooling system, which depends on the “application range” (evaporation) in which the compressor is approved and ready to work.
The evaporation range of each compressor, and therefore the evaporation range of each condensing unit, varies from person to person. Therefore, when selecting a CU, always check the evaporation range in which the compressor is approved for operation. This can be assessed using the technical datasheet. Here you can select the product and view this important information.
If it is necessary to apply the UC with a fluid different from that used in the previous system, it is important to check that the operating pressures (evaporation and condensation) are within the safety thresholds of the system piping.
4 . Power supply and start-up torque
In addition to the discussion above, continue to focus on the power supply. Be sure to select a condensing unit with the same voltage and frequency as the power supply. Start-up torque should also be analyzed. In systems with expansion valves (rather than capillary tubes), you must pay attention to whether the compressor has a high starting torque in the condensing unit.
For example, a compressor with a low starting torque can only be used in capillary systems, a compressor with a high starting torque can be used in expansion valves and capillaries. Have you considered these steps when selecting and sizing a condensing unit?