Bitzer 4DES-5Y-40S Semi-Hermetic Compressor

BITZER 4DES-5Y-40S Ecoline Semi-Hermetic Reciprocating Compressor

The BITZER 4DES-5Y-40S is a four-cylinder semi-hermetic reciprocating compressor from the benchmark BITZER ECOLINE series. Engineered for high operational efficiency in low- and medium-temperature refrigeration plants as well as commercial marine cold storage, this unit replaces legacy BITZER 4DC-5.2 / 4DC-5.2Y models with improved flow dynamics, optimized valve reed geometries, and lower acoustic signatures. Built to handle suction gas cooling directly over its high-torque internal motor windings, the 4DES-5Y operates reliably under high condensing temperatures and harsh, high-ambient marine engine room conditions.

Mechanical & Displacement Performance

• Displacement @ 50 Hz (1,450 RPM): 26.90 m³/h
• Displacement @ 60 Hz (1,750 RPM): 32.42 m³/h
• Bore / Stroke: 41 mm / 41 mm
• Number of Cylinders: 4 in V-configuration
• Swept Volume: 180.4 cm³ per shaft revolution
• Lubrication System: Centrifugal splash / internal dynamic lubrication with internal oil return channels
• Oil Fill Volume: 2.00 dm³ (2.0 Liters) initial charge; 1.6 Liters minimum operational level
• Standard Factory Oil Charge: BITZER BSE32 polyolester oil (POE, ISO VG32; optional B320SH for specific low-temperature HFC/HFO configurations)
• Maximum Permissible Pressure: Low-Pressure (LP) Side: 19.0 bar; High-Pressure (HP) Side: 28.0 bar / 32.0 bar (refrigerant dependent)
• Net Weight: 94.0 kg

Key Features

1. Optimized ECOLINE Valve Reed Geometry: Features high-durability impact-resistant spring steel reeds with minimized clearance volume, delivering up to a 12% increase in COP over older Generation-4 models.
2. Universal Multi-Refrigerant Compatibility: Operates seamlessly on medium- and low-GWP refrigerants including R134a, R404A, R507A, R407A, R407F, R448A, R449A, and R513A without mechanical modifications.
3. Integrated Electronic Core Protection (SE-B3): Factory-fitted module directly supervises three internal stator-embedded PTC thermal probes, safeguarding against phase loss, high winding temperatures, and excessive locked-rotor stress.
4. Dual Frequency Marine Rating: Fully rated for 50 Hz (1,450 RPM, 26.90 m³/h) and 60 Hz (1,750 RPM, 32.42 m³/h) marine auxiliary bus switchboards without auxiliary field transformers.
5. CRII Step-Less Capacity Control Ready: Cylinder heads are pre-machined to accommodate the BITZER CRII mechanical capacity control system (10% to 100% capacity modulating valve) to match dynamic cooling loads.

Compatible Equipment

• Marine Provision Refrigeration Packages: Carrier Marine, Dometic Marine Chiller, Sabroe / Johnson Controls Marine ChillPAC, Novenco Marine Galley Condensing Units.
• Commercial Multi-Compressor Racks: Bitzer Multi-Pack Racks, Linde Commercial Pack Systems, Hussmann Central Racks, Carrier Maxi-Cold Rack Units.
• Blast Freezers & Cold Stores: Viessmann industrial freezer cold rooms, Foster Coldstore modular condensing packages, Rivacold split systems.

Applications

• Commercial vessel provision rooms (Vegetable Room: +4°C to +6°C; Meat & Fish Room: -18°C to -25°C).
• Offshore accommodation platform HVAC split direct-expansion (DX) systems.
• Commercial refrigerated transport containers and intermodal reefers.
• Process cooling chillers for industrial pharmaceutical and chemical batch reactors.
• Hypermarket and supermarket centralized central pack refrigeration networks.

Frequently Asked Questions

What refrigerants are approved for use in the BITZER 4DES-5Y-40S compressor?

The BITZER 4DES-5Y-40S is fully compatible with synthetic HFC, HFO, and HFC/HFO blends, including R134a, R404A, R507A, R407A, R407F, R448A, R449A, and R513A. For systems operating on standard HFCs and HFOs, the compressor must be charged with BITZER BSE32 polyolester (POE) oil. For R22 retrofit operations, mineral oil B5.2 or alkylbenzene lubricants should be used instead.

Can the BITZER 4DES-5Y-40S run on both 50 Hz and 60 Hz electrical supplies?

Yes. The 4DES-5Y-40S operates across dual frequencies. On a 50 Hz supply (1,450 RPM), the compressor provides a displacement of 26.90 m³/h at 380–420V. On a 60 Hz electrical bus (1,750 RPM), commonly found on commercial vessels and marine power plants, it delivers 32.42 m³/h displacement at 440–480V.

What is the mechanical difference between 4DES-5Y-40S and older 4DC-5.2Y models?

The 4DES-5Y is the newer ECOLINE generation upgrade to the legacy 4DC-5.2Y. It retains identical mounting bolt patterns and pipe connection sizes for quick changeouts, but incorporates updated reed-valve cylinder heads, reduced internal friction coatings, improved motor electrical efficiency, and pre-machined mounting ports for CRII mechanical capacity control.

How does the SE-B3 motor protection module work?

The SE-B3 module acts as an electronic supervisor that continuously monitors a chain of PTC temperature sensors embedded directly in the motor’s copper windings. If winding temperatures exceed safe limits due to phase imbalance, loss of suction gas cooling, or mechanical overload, the SE-B3 trips an internal dry contact within milliseconds to open the compressor’s main power contactor.