Compressor description by Ralkin

Introduction: The BITZER 4TFR is a transport refrigeration compressor from the FR series, a special design developed specifically for truck and trailer refrigeration applications. Based on the approved vehicle air-conditioning series, the "R" designation signifies optimization for refrigeration, making it suitable for refrigerants R404A, R507A, and R22 across a wide application range from medium to low temperatures. These compressors are recognized for being the slimmest in their class, offering a wide speed range, and utilizing a belt-drive design with an electro-magnetic clutch.

### Model Identification

• 4: Number of cylinders.
• T: Frame size/cylinder volume code (475 cm³).
• F: Series designator (FR series).
• R: Refrigeration optimization.
• (Y): Indicates availability of specific configurations/accessories (as per series nomenclature).

### Technical Features:

• Refrigerant Optimization: Specifically optimized for R404A, R507A, and R22 (other refrigerants available upon request).
• Shaft Seal: Patented design with a secondary oil barrier; easily accessible and exchangeable for service.
• Drive Parts: Ensures smooth running due to the four-cylinder principle and dynamic mass balance; low friction losses achieved via surface-hardened crankshaft, optimized piston geometry, hard chrome-plated piston rings, and connecting rods with closed big ends.
• Cylinder Liners: Exchangeable and particularly wear-resistant.
• Bearings: Combined roller and sleeve bearings of the eccentric shaft, engineered for extreme loads at high speeds.
• Lubrication: Utilizes a reversible oil pump for lubrication.
• Oil Management: Features an internal oil separator to ensure minimum oil carry-over rate.
• Valves: Dynamic working flapper valves made of impact-resistant spring steel, contributing to high efficiencies through optimized geometry and dynamic characteristics.
• Safety: Integrated pressure relief valve.
• Shaft: Tapered shaft end for safe and low-vibration power transmission.
• Mounting: Exchangeable position of the suction shut-off valve for flexible mounting in tight spaces.

### Specifications & Data:

• Compressor Type: 4TFR(Y)
• Number of Cylinders: 4
• Cylinder Volume: 475 cm³
• Displacement (at 1450 rpm): 41.3 m³/h
• Weight: 34.7 kg
• Oil Charge: 2.5 dm³
• Speed Range: 500 – 2600 min⁻¹
• Discharge Line Connection: 28 mm (1 1/8 inch)
• Suction Line Connection: 35 mm (1 3/8 inch)
• Capacity Control: Available as an accessory (Steps of 100% and 50%)
• Magnetic Clutch: Available as an accessory (Compatible with LINNIG LA16KK or LANG KK 73.1)
• Crankcase Heater: Available as an accessory
• Oil Drier: Available as an accessory