3. APPLICATION
4. GLOSSARY
- Low and medium power industrial refrigeration
Group: It is a set of suction or discharge lines that have links (same refrigerator circuit).
- Rack type refrigeration equipment (compressors in parallel)
Unloader: Capacity regulating valve on compressors.
- Cold storage facilities
Overheating: Temperature difference above a refrigerant’s boiling point for a given pressure.
VCC: Variable Compressor Capacity Compressor. Name the compressor that allows modulation within a continuous range, usually
between 10 and 100%.
- Condensing units
Subcooling: Temperature difference below the dew point of a refrigerant for a given pressure.
VCC-Analog: Compressor whose capacity is modulated by means of an analog output from the controller (0-10V signal).
Compression: Pressure control where the hysteresis interval is below the setpoint
VCC-Digital: Compressor whose capacity is modulated through the actuation of digital outputs (SSRs) to control unloaders valves.
Decompression: Pressure control where the hysteresis interval is above the setpoint
Control line: A circuit section with the same pressure or temperature control, for example: suction or discharge.
- Plug-ins
Pressure switch: Pressure control based on a setpoint and a hysteresis.
Thermostat: Temperature control based on a setpoint and a hysteresis.
SSR: Solid State Relay. Electronic device for driving electric loads that allows a higher frequency of switching than electro-mechanical
relay. Used to drive alternating current (AC) charges only.
Setpoint: Desirable value of the control parameter (pressure or temperature).
- Compression centers for supermarkets, logistic storage centers or air conditioning systems
Hysteresis: Range of variation of the control parameter, also known as Control differential.
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