The units with white bodies and red cylinder covers located at the bottom of the visual are Semi-Hermetic Piston Compressors. Working Principle: The electric motor and the compression mechanism are within the same body. However, being "semi-hermetic" means the device can be opened with bolted connections and repaired in case of failure (winding replacement, piston overhaul, etc.). Capacity Control: In this type of unit, multiple compressors are usually connected in parallel. When the cooling demand decreases, some compressors stop, and when the demand increases, all of them engage, providing high energy savings. Purpose of Use: Used to supply cooling lines for frozen storage rooms, shock tunnels, or large supermarkets. Technical Components and Weight Detail Each of the compressors in this system can weigh between 150 kg and 400 kg on its own, depending on its capacity. The weight of the entire chassis (including compressors, oil separators, liquid tanks, and copper piping) is determined by the number of compressors. Number of Compressors: It is understood from the visual that there are 2 or 3 compressors connected in parallel. Total Weight Impact: This unit, along with the condenser (top part with fans) it is mounted on, reaches a significant tonnage.