The new Semi-Hermetic 1-stage reciprocating compressors Bitzer Ecoline series for R134a

During the last years the influence of refrigeration on the environment has increasingly become the focus of public discussion. Besides energy efficiency, which has always been a major issue for BITZER, the total CO2 balance of the refrigeration system (energy consumption, leakage and recovery losses) is an essential criterion for environmental compatibility. Comprehensive analyses of supermarket systems have shown that at present for medium temperature applications R143a offers the best ecological efficiency. For this BITZER has developed new optimized R134a compressors adapted especially to medium temperature applications with significantly improved efficiency at low condensing temperatures. The application limits have been expanded towards lower condensing temperatures so that the annual COP can be increased up to 20%.

The special highlights of the BITZER ECOLINE compressors:

• Specially adapted highly efficient, robust working valves;
• Specially adapted high efficiency motors;
• Highly approved drive gear;
• Minimized pressure losses in entire flow section;
• Variable speed from 25 – 70 Hz*.

* Motor version 2: with standard tension; Motor version 1: with special tension is possible

A closely graduated product range for modern refrigeration, air-conditioning and heat pump systems

With the CE4 to BE6 series BITZER offers compressors especially optimized for R134a that meet the challenging demands of modern refrigerant systems:

❏ Specially adapted application range

• R134a for medium temperature application;
• R134a for heat pumps.

❏ Energy efficient

• high cooling capacity and minimum;
• energy requirement;
• highly efficient working valves;
• minimum clearance volume;
• efficient large-volume motor;
• optimized for low condensing temperatures.

❏ Efficient capacity control

• from 34,7 m3/h to 151,5 m3/h at 50 Hz;
• up to 2 cylinder banks can be switched off (option) – 4 cylinder compressor: 50%; 6 cylinder compressor: 66%/33%;
• approved parallel operation;
• tandem compressors for CE4 to BE6 series: 69 m3/h to 303 m3/h (50 Hz).

❏ Wear resistant drive gear

• surface hardened crankshaft;
• low friction bearings and aluminium pistons;
• hard chrome plated piston rings.

❏ Quiet with low vibration

• optimized mass compensation;
• low pulsation.

❏ Minimum space requirement

• extremely compact design.

❏ Robust

• solid valve plate construction;
• valves made of impact resistant;
• spring steel;
• wear resistant drive gear.

❏ Electronic compressor protection

• thermal motor monitoring with PTC sensors.

❏ Crankcase heater (option) with pre-mounted heater sleeve

Performance data

Performance data are based on the European Standard EN 12900 and 50 Hz operation. Performance data for individual operating conditions and 60 Hz operation see BITZER Software.

All data do not include liquid subcooling. Based on EN 12900 the rated cooling capacity and efficiency (COP) show therefore lower values in comparison to data based on 5 or 8.3 K subcooling. For further information see Refrigerant Report (A-501).

Explanation of model designation

4  N  E  S  –  20  Y  –  40P

Index for number of cylinders (double with tandem compressor)

4  N  E  S  –  20  Y  –  40P

Identification letter for bore x stroke

4  N  E  S  –  20  Y  –  40P

Identification letter for BITZER ECOLINE series

4  N  E  S  –  20  Y  –  40P

Code for centrifugal lubrication of CE4

4  N  E  S  –  20  Y  –  40P

Code for motor size

4  N  E  S  –  20  Y  –  40P

Identification letter for ester oil charge

4  N  E  S  –  20  Y  –  40P

Motor code

Optional extras

Depending on series among others: crankcase heater, differential oil pressure switch or oil level monitoring (CE4 series), integrated start unloader, integrated capacity control, additional fan, discharge gas temperature sensor

Technical data

Crankcase heater

❏ 230V

• 4VES-6Y .. 4NES-20Y: 0 .. 140 W self-regulating PTC heater
• 4JE-13Y .. 6FE-50Y: 140 W

❏ mandatory in case of

• outdoor installation of the compressor;
• long shut-off periods;
• high refrigerant charge;
• danger of refrigerant condensation into the compressor.

Performance data 50 Hz relating to 20°C suction gas temperature, without liquid subcooling

The operation principle, structure, design features and technical characteristics of Semi-hermetic screw compressors Bitzer