They contain closed cooling circuit, regulation, water tank, pump with bypass, control, signalisation of failures, protections. Type J-xx, air cooled contains axial fans. Type JV-xx, water cooled contains plate condenser with regulation.

They contain closed cooling circuit, plate or boiler evaporator, control, fault indication, protection, water temperature control. Type JS-xx is air-cooled, includes a standard axial fan. Type JVS-xx is water-cooled, contains a plate condenser with control.