Bohn BBN0551M6 User Manual

AIRCOOLED CONDENSING UNITS with BITZER COMPRESSORS

Technical Guide

BNCUBZTB

April 2011

Table of Contents

Floating Tube™ Coil 3 Options 4-5 Limitizer® 6 Bitzer Compressor Features and Benets 7-8

Horizontal Air Discharge Condensing Units 4 to 13 HP

Standard and Optional Features 9 Nomenclature 9

Performance Data

Medium Temperature - R-404A/R-507

Low Temperature

Electrical Data

Medium Temperature - R-404A/R-507 Low Temperature

Specications and Dimensional Data

Medium Temperature - R-404A/R-507 Low Temperature

- R-404A/R-507

Vertical Air Discharge Condensing Units 13 to 50 HP, Single Compressor

Standard and Optional Features 13

Nomenclature 13 Performance Data

Medium Temperature Low Temperature

Electrical Data

Medium Temperature Low Temperature

Specications and Dimensional Data Medium Temperature Low Temperature

Vertical Air Discharge Condensing Units 26 to 100 HP, Dual Compressor

Standard and Optional Features 18 Nomenclature 18 Performance Data

Medium Temperature Low Temperature

Electrical Data Medium Temperature Low Temperature

Specications and Dimensional Data Medium Temperature Low Temperature

- R-404A/R-507

Single And Dual Compressor Condensing Units Feature Our Floating Tube™ Coil Design

Expanded (Locked) Auxiliary Tubes:

These tubes support the coil with ns and refrigerant carrying tubes. They do not carry refrigerant and are tightly tted on end supports and center supports.

Free Floating Circuited Coil Tubes:

These tubes carry refrigerant and never touch and sheet metal (end supports and center supports).

All units include a limited

Five Year Warranty

against condenser leaks at tube sheets and

center supports.

All condensers use the Floating Tube™ coil design to eliminate refrigerant leaks at the tube sheets. Additional tubes are added to the condenser coil. These tubes are expanded into the aluminum ns and condenser tube sheets. These anchor tubes support the weight of the coil, but are not a part of the refrigerant circuit.

The tubes in the refrigerant circuit are expanded into the ns, but “oat” through oversized holes in the tube sheets. Tube sheet leaks are virtually eliminated, since the tubes which carry refrigerant never come in contact with the tube sheet.

Options

E Solutions branded products and options are designed to exceed current energy and environmental

standards. It is our commitment in environmental innovation to dedicate ourselves by delivering energy ecient eco-conscious choices. Products included in the E Solutions portfolio reduce costs, improve bottom lines, and enhance equipment performance and service life.

The Beacon II™ Refrigeration System with Smart Defrost, and the factory-installed Smart Defrost Kit™ are E Solutions options that will optimize your savings and increase energy eciency.

Available with Beacon II

™

Beacon II™ is the next generation of Bohn’s patented, preassembled, factory installed refrigeration system featuring an integrated microcomputer-based electronic control board. The Beacon II™ systems come completely factory installed, wired and tested saving you time and money.

™

Beacon II™ oers:

• Complete factory installation, wiring and testing which saves time and money

• Simple eld electrical connections and 24 volt wiring between condensing and evaporator units

• Preset factory superheat allowing the system to run more eciently and reducing future adjustments

• Monitors and controls box temperature, evaporator superheat, condenser fan cycling on two fan units, system status and defrost from outside the box

• Monitor and make system changes remotely via modem and exclusive Beacon II™ Smart II software

• Data logging capabilities with Smart Controller

Beacon II™ Smart Controller

Beacon II™ Smart Controller is an optional system monitoring and programming control device. It allows for adjustments to be made at the push of a button from a conveniently mounted location. The Beacon II™ Smart Controller also allows you to monitor and make changes to the refrigeration system via modem connection from anywhere in the world. The Beacon II™ has been updated to allow the user to make even more precise adjustments than the original Beacon’s Smart Controller. One Smart Controller can program and control up to four separate condensing units with up to four evaporators on each system. That’s more control in your hands!

™

Beacon II

Beacon II™ Smart II Software makes it easy to adjust and monitor one or more refrigeration systems as well as capture minute by minute system conditions. This Windows-based software allows you to connect to the Beacon II™ Smart Controller from anywhere in the world to monitor the systems, make adjustments and log minute by minute system conditions. This data logging capability is critical in the food service industry.

™

Beacon II

The Beacon II™ Smart Defrost, available only on the Beacon II™ Smart Controller, enables the Beacon II™ system to sense frost accumulation and initiates defrost only when it is necessary. To begin, preset defrost times using the Beacon II™ Smart Controller. At each scheduled defrost time, Smart Defrost checks system performance to see if a defrost is necessary. If not, it simply does not defrost, waiting until the next scheduled defrost time.

Smart Defrost

Smart II Software

Smart Defrost Kit™

The factory installed Smart Defrost Kit (SDK) skips unnecessary defrosts in commercial, electric defrost walk-in refrigeration systems saving energy, reducing costs and ultimately improving product integrity. The SDK is available as a factory-installed option on all condensing units.

LIMITIZER

The Need For Head Pressure Control

Refrigeration condensing units must eciently perform at varying ambient conditions. A properly sized unit will adequately perform at even the highest summer ambient temperatures. However, in situations where the system must operate the majority of the time at less than design temperature, a means of providing adequate head pressure for refrigerant ow is desirable.

The Bohn Limitizer® System

The Limitizer® system is a factory assembled system utilizing a Limitizer® control to maintain a constant head pressure at the air cooled condensing unit during all climatic conditions when the ambient temperature drops below 75°F (typical).

When the ambient is above 75°F, the condenser pressure is above the Limitizer® valve setting and therefore, the valve remains in the full open position.

As the temperature drops below 75°F, the pressure at the condenser also drops below the setting of the Limitizer valve, sensing the reduction in condensing pressure, modulates toward the closed position, thus restricting the ow of liquid from the condenser. The liquid backs up into the condenser and oods a portion of the tubes, thus reducing the overall capacity of the condenser. The Limitizer® valve will continue to ood the condenser until the pressure setting has been reached, thus providing proper head pressure at all ambient temperatures.

valve. The Limitizer®

While the condenser oods, a second line pressurizes the receiver through another valve. Therefore, the refrigerant flow from the condenser to the receiver modulates with conditions. However, the bypass from the discharge line maintains a minimum receiver pressure. These valves are adjustable and the minimum receiver pressure may be reset higher or lower depending upon application situations of a particular job. The Limitizer adjustable design.

system uses this two-valve,

Bitzer Compressors Features and Benets

Bitzer is the world’s largest manufacturer of semi-hermetic refrigeration compressors over 3 HP. In business since 1934, Bitzer has manufacturing plants in Germany, Brazil, Portugal, China and the United States and operates in over 100 countries around the world. Bitzer’s Georgia plant manufactures a complete range of semi-hermetic compressors from 3 to 50 HP. Bitzer provides aftermarket support through wholesalers and also provides 24-hour replacement service from its seven distribution warehouses located across the U.S.

Bitzer Oers:

• 1-Year Warranty

• Unloader Heads Standard on All 4 & 6-cylinder Models

• Dual Voltage Control Modules on All Models

• Dual Voltage Compressors (6 to 50 HP)

• Lowest Sound Levels in their Class (Built-in Muers)

• Superior Lubrication and Low Oil Circulation Rates

• German Engineering / Built in America

Bitzer Standard Execution

POE Oil Charge √ √

Protective Dry-Nitrogen Charge √ √

Suction & Discharge Service Valves √ √

Dual Voltage INT Protection Modules √ √

Terminal Box Enclosure Class IP65 √ √

Unloader Heads √ √

Patented Internal Muers √ √

Centrifugal Oil System √ √

Conventional Oil Pump √ √

Bitzer Options 4C Models 4B & 6B

Mounting Hardware (Spring Kits) √ √

Hard Mount Kits √ √

Optical Oil Sensor √ √

Crankcase Heaters √ √

Unloader Stems / Coils √ √

Head Fans and Brackets √ √

Delta P II Dierential Oil Pres. Switch √ √

Octagon

4C Models

4B & 6B Models

Bitzer Quiet!!!

Bitzer compressors are famous for their low sound levels. We change capacities within a frame size by changing our bore diameters rather than the length of the piston strokes. This gives our compressors an unsurpassed balance and precision that translates to low decibels. In addition, Bitzer compressors have a muer built into each head (see photo) that eliminates pulsations and reduces the sound levels even further.

Bitzer Compressors Features and Benets

Octagon® 4C Models

Bitzer Octagon 4C Models are rated from 3 to 20 HP. This rugged, compact series utilizes wear resistant drive gear with PTFE coated bearings for especially low friction, aluminum pistons of optimized geometry, connecting rods with eccentric straps and generously dimensioned bearing surfaces. Bitzer’s centrifugal lubrication system eliminates the need for an oil pump and provides optimum oil supply to the compressor even under extreme operating conditions.

Centrifugal Lubrication

The centrifugal lubrication design employs a solid metal disc mounted to the crankshaft (see cut-away) that distributes oil into a reservoir at the end of the shaft. The oil then ows through the shaft to the bearing surfaces.

OLC-K1 Operating Principle

The OLC-K1 sensing device shines an infrared light into the oil reservoir. If oil is present, the light is absorbed and the compressor runs normally. If no oil is present, the light reects on the sensor, and the compressor shuts o.

Bitzer 4B & 6B Models

Bitzer 4B through 6B Models are rated from 13 to 50 HP. This series features surface hardened crank shafts, low friction bearings, aluminum pistons, hard chrome plated piston rings and special wrist pin bearings. The 4B & 6B models have a sealed main bearing and generously sized oil pump. Our patented oil return system ensures complete lubrication while reducing oil circulation into the system. Ecient capacity control is provided by unloader banks that can signicantly reduce energy consumption.

Bitzer oers an optional Optical Oil Sensor (See OLC-K1 photo below) that mounts to the outer cover of the compressor and monitors oil level by means of an infrared light.

+ 16 hidden pages

Bohn BBN0551M6 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual