Compressor description by Ralkin

The BITZER ROADSTAR family includes optimized 4 and 6 cylinder aluminum compact compressors developed specifically for the special requirements of vehicle air-conditioning. Designed to cope with the challenges of all climatic zones and mobile operating conditions, this series offers unsurpassed advantages such as compact design, low weight, high efficiency, and approved BITZER reliability.

Model Identification

• Series: BITZER ROADSTAR (Extended Series 2 cylinder, Optimized 4 and 6 cylinder)
• Model: 6NFC(Y)
• Cylinders: 6
• Application: Vehicle Air-Conditioning

Technical Features:

• Refrigerant: Optimized for R134a (other refrigerants available upon request).
• Shaft Seal: Patented design with a secondary oil barrier; easily accessible and exchangeable.
• Drive Parts: Smooth running due to the six-cylinder principle; low friction losses from surface-hardened drive shaft, optimized pistons, and hard chrome-plated piston rings; reinforced connecting rods geometry.
• Cylinder Liners: Exchangeable and particularly wear-resistant.
• Bearings: Combined roller and sleeve bearings of the drive shaft, designed for extreme loadings at high speed.
• Lubrication: Lubrication by reversible oil pump.
• Oil Management: Minimum oil carry-over rate due to an internal oil separator.
• Valves: Valve plates with flapper valves made of impact-resistant spring steel.
• Safety: Integrated pressure relief valve.
• Shaft: Tapered shaft end for precise, safe, and low-vibration power transmission.
• Mounting: Exchangeable position of the shut-off valves with optional spacer flanges enables flexible mounting in tight spaces.
• Drive Type: Belt drive with an electro-magnetic clutch is standard for 4 and 6 cylinder models.

Specifications & Data:

• Displacement: 84.4 m³/h at 1450 rpm; 174.6 m³/h at 3000 rpm.
• Cylinder Volume: 970 cm³.
• Weight: 39.0 kg (Note: Standard bottom plate adds 1 kg).
• Oil Charge: 1.5 dm³ (Note: Standard bottom plate adds 1 dm³).
• Capacity Control: Available with steps of 100% and 66%, or alternatively 33% (Accessory).
• Speed Range: 500 – 3500 min⁻¹.
• Note: The compressor is optimized for a vehicle engine with variable speed. Do not exceed the maximum speed (3500 rpm), even at high idle.
• Pipe Connections:
• Discharge Line: 35 mm (1 3/8 inch).
• Suction Line: 2x 35 mm (2x 1 3/8 inch).
• Magnetic Clutch (Accessory): LINNIG LA16, LANG KK73.4.

Important Operational Warning: Do not exceed the maximum speed (3500 rpm), even at high idle (no-load operation) of the vehicle engine.