Euro Line compressor unit *FU* regulated EFU1-DO-3 HI241CC+CIMR-AC40018F

Frequency-regulated Dorin compressor units work using a HI series semi-hermetic compressor. These units have been specially developed for use in refrigeration systems with variable refrigeration demand. The use of a Power Electronics Yaskawa frequency converter allows compressors to run continuously while optimally adjusting cooling performance to the current conditions. These compressor units are therefore an energy-efficient and space-saving alternative to power racks with multiple compressors.

The Dorin compressor units are available in four different performance classes. Refrigerants R134a, R450A/R513A can be used. The maximum frequency may be limited for air conditioning applications. Cooling power is regulated depending on the intake pressure. A Power Electronics Yaskawa frequency converter is used in combination with a pressure transmitter to control the compressor unit. This is mounted and thermally decoupled on the intake side and records the actual intake pressure value. The power rack controller regulates the cooling power of the rack so that the target value is achieved as closely as possible.

The frequency converter is included with the control box. Configuration is input via a keyboard. The frequency convertor comes pre-configured. Only a small number of parameters must be changed to make changes to the refrigerant used and the place of use. The control box is mounted to the frame and wired. If there is a fault with the frequency converter, it is possible to manually switch to a temporary emergency operating mode via an additional low pressure switch.

The control box issues an isolated release signal to control solenoid valves in the fluid line. In the event of a system fault, this release is deactivated in order to prevent damage from fluid hammering when restarting the system All components are mounted to a tough riveted steel profile frame. All parts of the frame have a double coating. The power rack stands on the supplied rubber-bonded metal base. Refrigeration lines are conveniently grouped together at the rear and can be shut off.
Power racks are fitted with an oil separator as standard in order to ensure reliable operation, even during a temporary minimal cooling load on the system.

• optimally adapt compressor performance to changing loads on the refrigeration system
• low minimum cooling power
• optimal temperature and quality for refrigerated goods
• minimal space needed due to compact design
• energy saving from better performance control in optimal evaporating temperatures
• standard components and simple to replace compressors mean it is easy to service
• reduce the installed cooling power and thus the cost of investment by use of coincidence factor
• simple installation of a heat recovery systems using a common heat exchanger for all areas to be cooled

• Control box with Power Electronics frequency converter, installation and wired
• semi-hermetic compressor from Dorin with crankcase heater
• compressor shut-off valves
• fluid collector
• refrigerant dryer / inspection glass
• filling valve in the fluid line
• ball shut-off valve in the pressure, fluid and suction lines
• pressure transmitter, suction pressure -0.5 - 7 bar
• pressure transmitter, high pressure 0 - 30 bar
• combined high/low pressure monitor, type tested
• low pressure switch, type tested for emergency operation
• oil separator with inspection glass and shut-off valve in the return line, with electrical heating