Bitzer OSNA8571-K

ST-410-2
SH-510-1
APPLICATIONS MANUAL
PROJEKTIERUNGS-HANDBUCH
MANUEL DE MISE EN ŒUVRE
OS.85
OPEN DRIVE SCREW COMPRESSORS
OFFENE SCHRAUBENVERDICHTER
COMPRESSEURS À VIS OUVERTS

Bitzer OSNA8571-K Specifications

General

Model	OSNA8571-K
Refrigerant	R22, R134a, R407C, R404A, R507
Weight	950 kg
Power Input	15.0 kW
Frequency	50 Hz
Sound Power Level	85 dB(A)
Displacement (1450 RPM)	857.1 cm³
Motor Power	15.0 kW
Oil Pump	Integrated
Dimensions (LxWxH)	580 mm

Summary

1 Highlights and Applications

1.1 Key Features of OS.85 Series

Highlights the OS.85 compressors' innovation, efficiency, and key technical attributes.

2 Design and Technical Features

2.1 Energy Efficiency and Robustness

2 Compressor Design and Functions

2.1 Construction Features

2.2 Compression Process and Control

2.2.1 Vi-Control in Compression

Details the compression process and the Vi-control for varying internal volume ratios.

2.3 Capacity Control and Start Unloading

2.3.1 Dual Capacity Control

Explains the dual capacity control system allowing infinite or stepped regulation.

2.3.2 Automatic Start Unloading

Covers the automatic start unloading feature to reduce starting torque.

2.5 Compressor Start and Capacity Control Methods

2.5.1 Compressor Start Procedure

Details the compressor start-up sequence, including unloading.

2.6 Infinite Capacity Control

Recommends infinite capacity control for systems requiring high accuracy.

2.9 Oil Circuit and Management

2.9.1 Integrated Oil Management System

Details the integrated oil management system and its components.

2.10 Oil Cooling Methods

2.10.1 External Oil Coolers

2.10 Oil Cooling Guidelines

2.10.1 External Oil Cooler Installation

2.10 Thermosiphon Oil Cooling

2.10.1 Principle and Application

Explains thermosiphon oil cooling principles and its application.

3 Lubricants and Oil Tables

3.1 Lubricant Table for HFC and R22

Presents a table of lubricants for HFC and R22 refrigerants with their properties.

3.2 Lubricant Table for NH3

4 System Integration into Refrigeration Circuit

4.1 System Design and Pipe Layout

4.2 Guidelines for Special System Conditions

4.2.2 Pump Down System

Details the pump down system requirements and function.

4.3 Safe Compressor and System Operation

4.3.1 Expansion Valve Function

Covers requirements for the expansion valve, including sensor positioning.

4.5 Compressor Start Unloading

4.6 Capacity Control Methods

4.6.1 Integrated Capacity Control

Explains the integrated capacity control feature.

4.7 Parallel Compounding

4.7.1 Advantages of BITZER Compound Technology

4.4 Condenser Pressure Control

4.4.1 Requirements for Condenser Pressure Control

Details the necessity of pressure control for optimal oil supply and efficiency.

4.5 Start Unloading Mechanisms

4.5.1 Integrated and Additional Start Unloading

Covers integrated and additional start unloading methods like bypass.

4.8 ECO Operation Principles

4.8.1 ECO Port Functionality

Explains the function of the integrated ECO port in the control slider.

4.8 ECO Operation with Subcooling Circuit

4.8.1 Subcooling Circuit Operation

Details ECO operation using a heat exchanger as a liquid subcooler.

5 Additional Components: Liquid Subcoolers

5.1 Liquid Subcooler Selection

Guides on selecting liquid subcoolers based on heat exchangers and software data.

5 Expansion Valve and Control

5.1 Thermostatic Expansion Valves

Covers valve layout and selection for liquid subcoolers and evaporators.

4.9 Explosion Protection Areas

4.9.1 Explosion-Proof Compressors

Lists explosion-proof compressor models available upon request.

4.9.2 Explosion-Proof Oil Separators

Lists explosion-proof oil separator models available upon request.

5 Electrical Connection and Motor Design

5.1 Motor Design and Starting Methods

5.2 Electrical Component Selection

5.3 Power Factor Correction

5.3.2 Individual Power Factor Correction

5.3 Central Power Factor Correction

5.3.3 Central Correction Requirements

Details central power factor correction and its requirements.

5.3 Protection Devices

5.3.1 SE-B2 Monitoring Functions

Details SE-B2 monitoring functions for temperature and oil flow.

5.3 SE-B2 Monitoring Functions

5.3.1 Oil Flow Monitoring

Explains oil flow monitoring.

5.3.2 Rotation Direction and Oil Stop Valve Monitoring

Covers monitoring of rotation direction and oil stop valve.

5.3.3 Oil Filter Monitoring

Explains oil filter monitoring.

5.3 OFC and SE-C2 Monitoring Functions

5.3.1 OFC Monitoring Function

Details OFC monitoring function for oil flow.

5.3.2 SE-C2 Monitoring Functions

Lists SE-C2 monitoring functions for rotation direction, oil flow, temperature, and cycling rate.

5.3 Cycling Rate and System Operation

5.3.1 Cycling Rate Monitoring

Covers SE-C2 monitoring of compressor cycling rate.

5.4 Schematic Wiring Diagrams

5.4.1 Standard Monitoring Concept

Details the standard monitoring concept with SE-B2.

4.6 Infinite Capacity Control (Standard)

4.7 4-Step Capacity Control (with OFC)

4.6 Infinite Capacity Control (with OFC)

4.6 Infinite Capacity Control (with SE-C2)

4.7 4-Step Capacity Control (with SE-C2)

31 ECO Operation Options

31.1 Oil Level Switch

31.2 Oil Heater

31 ECO Operation Delay (Path 31)

31.1 Delay Control for ECO Operation

Explains the delay control for activating ECO operation.

7 Pump Down System Operation

7.1 Automatic Pump Down System

Shows a simplified schematic for automatic pump down.

7.2 Single Pump Down System

Shows a simplified schematic for single pump down.

7.3 Compressor Switching in Pump Down

7.3.1 Compressor Switching Logic

Explains compressor switching based on suction pressure for pump down.

7 Technical Data

7.1 Standard Compressor Technical Data

Lists technical data for standard OS.85 compressors.

7.2 NH3 Compressor Technical Data

Lists technical data for OS.A85 NH3 compressors.

8 Application Limits

9 Performance Data

9.1 BITZER Software Usage

9.1.1 Selecting Default Settings

Guides through selecting language, units, and output headers.

9.1.3 Main Menu Navigation

Describes the main menu options for selecting compressors or cooling capacity.

9.2 Compressor Selection via BITZER Software

9.2.1 Selecting the Main Menu

Guides on selecting the "Open Drive Screws" main menu.

9.2.2 Selecting Compressor Model

Instructs to select the desired compressor model.

9.2.3 Calculating and Accessing Accessories

Explains how to calculate and access accessories after model selection.

9.3 Determining Compressor Performance Data

9.3.1 Selecting the Main Menu

Guides on how to select the "Open Drive Screws" main menu.

9.3.2 Selecting Compressor Model

9.3.3 Calculating Performance Data

8 Technical Data of a Compressor

8.1 Accessing Technical Data

8.2 Exporting Data Sheets

9 Exporting Performance Tables

9.1 Accessing Performance Tables

10 Exporting Data Sheets

10.1 Selecting Compressor Model

10.2 Calculating Data

10.3 Accessing Tables

10 Exporting Data Sheets and Polynomials

10.3 Exporting Data Sheets

9.4 Selecting Accessories for a Specific Compressor

9.4.1 Selecting the Main Menu

9.4.2 Selecting Compressor Model

9.4.3 Calculating and Accessing Accessories

7 Technical Data of Selected Accessories

8 Dimensional Drawings of Accessories

8.1 Viewing Dimensional Drawings

9 Exporting Accessory Data Sheets

10 Dimensional Drawings

10.1 Connection Positions

11 Dimensional Drawings

11.1 Connection Positions

Oil Heater and Oil Thermostat Mounting

11.1.1 Dimensions

Oil Level Switch Mounting

11.2 Oil Separators for HFC and R22

11.2.1 Application Ranges

11.2.2 Technical Data

11.3 NH3 Primary Oil Separators

11.3.1 Application Ranges

11.3.2 Technical Data

11.4 NH3 Secondary Oil Separators

11.4.1 Application Ranges

11.4.2 Technical Data

11.5 Water-cooled Oil Coolers for HFC and R22

11.5.1 Performance Data

11.6 Water-cooled Oil Coolers for NH3

11.6.1 Performance Data

11.7 Air-cooled Oil Coolers for HFC and R22

11.7.1 Performance Data

11.8 Accessories for Oil Circuit

11.8.1 Technical Data