Bohn BD0300L2E Service Manual

3-22 HP Condensing units
Technical Guide
Discus® and Scroll® Models
BNHCUTB
March 2009
Replaces BN-HCUTB, October 2008
www.thecoldstandard.com
TABLE OF CONTENTS
Nomenclature ............................................................................................................................................................................................................................2
Standard Features .................................................................................................................................................................................................................... 3
Options .................................................................................................................................................................................................................................... 4-5
Bohnmizer® .............................................................................................................................................................................................................................6-7
Condenser Capacity
R-22 Discus® Compressors - High Temperature............................................................................................................................................................. 8
R-22 Scroll® Compressors - Low Temperature ................................................................................................................................................................8
R-22 Discus® Compressors - Low Temperature ..............................................................................................................................................................9
R-404A/R-507 Discus® Compressors - Medium Temperature
R-404A/R-507 Discus® Compressors - Low Temperature ........................................................................................................................................11
R-404A/R-507 Scroll® Compressors - Medium Temperature ..................................................................................................................................12
R-404A/R-507 Scroll® Compressors - Low Temperature ..........................................................................................................................................12
Electrical Specications
R-22 Discus® Compressors - High Temperature...........................................................................................................................................................13
R-22 Scroll® Compressors - Low Temperature ..............................................................................................................................................................14
R-22 Discus® Compressors - Low Temperature ............................................................................................................................................................14
R-404A/R-507 Discus® Compressors - Medium Temperature
R-404A/R-507 Discus® Compressors - Low Temperature ........................................................................................................................................15
R-404A/R-507 Scroll® Compressors - Medium Temperature ..................................................................................................................................16
R-404A/R-507 Scroll® Compressors - Low Temperature ..........................................................................................................................................16
Physical Specications
R-22 Discus® Compressors - High Temperature...........................................................................................................................................................17
R-22 Scroll® Compressors - Low Temperature ..............................................................................................................................................................17
R-22 Discus® Compressors - Low Temperature ............................................................................................................................................................17
R-404A/R-507 Discus® Compressors - Medium Temperature
R-404A/R-507 Discus® Compressors - Low Temperature ........................................................................................................................................18
R-404A/R-507 Scroll® Compressors - Medium Temperature ..................................................................................................................................18
R-404A/R-507 Scroll® Compressors - Low Temperature ..........................................................................................................................................18
..................................................................................................................................10
..................................................................................................................................15
..................................................................................................................................17
Dimensional Diagrams .........................................................................................................................................................................................................1
Nomenclature
B
ModelDCompressorTApplication
B = Bohn D = Discus
Z = Scroll
®
®
S = Beacon II
B = Bohnmizer
T = Outdoor
N = Indoor
0300 = 3HP 0400 = 4HP
0500 = 5HP 0501 = 5HP 0600 = 6HP 0601 = 6HP
0650 = 6.5HP
0700 = 7HP
0750 = 7.5HP
0500
Equiv. HP
0751 = 7.5HP
0800 = 8HP
0860 = 8.5HP
0900 = 9HP 1000 = 10HP 1200 = 12HP 1300 = 13HP 1401 = 14HP 1500 = 15HP 2200 = 22HP
L
Temperature6Refrigerant
H = High Temp.
M = Med. Temp.
L = Low Temp.
2 = R-22
6 = R-404A,
R-507
©2009 Heatcraft Refrigeration Products, LLC
C
Voltage
C = 208-230/3/60
(200-220/3/50)*
D = 460/3/60
(380-420/3/50)*
E = 575/3/60
*Limited by compressor
model
9
STANDARD FEATURES
Floating Tube™ coil design
Suction and discharge vibration eliminators with Discus® compressors
Spring mounting with Discus® compressors
Fixed high and adjustable low pressure switches
Sentronic oil failure switch with Discus® compressors
Discharge line check valve with medium and low temperature Scroll® compressors
Discharge line thermostat with medium temperature Scroll® compressors
Liquid injection solenoid valve and capillary tube with low temperature Scroll® compressors
Manual pump-down switch
Refrigeration-duty, ried copper condenser tubing
Crankcase heater and head pressure valve on all outdoor units
Sight glass and permanent liquid line lter
Better Performance
Enhanced grill design gives 25% to 40% increase in free-air area
Electrical box relocated out of air stream
Vertical receiver needs less refrigerant for liquid seal
Faster Access
Base valve and high & low pressure taps on outside of unit
Removable grill for access to all serviceable parts
Improved access to fan motors & components
Lighter, one-piece top
Easy-to-view sight glass location
Easier Service
Better access to components for easier repair
Compact design allows for better jobsite placement & installation
Dual isolation valves on receiver
Greater Reliability
Floating Tube™ coil design eliminates tube-sheet leaks
Pre-bent tubing reduces mechanical joints
State-of-the-art factory leak-detection ensures highest quality
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, the factory-installed Smart Defrost Kit™ and the Bohnmizer® System are E Solutions options that will optimize your savings and increase energy eciency.
Smart Defrost Kit™
The Smart Defrost Kit (SDK), available as a factory-installed option or as an aftermarket retrot kit via InerLink Commercial Refrigeration Parts, is a control module that can reduce the number of defrosts by up to 40% on a typical commercial refrigeration system. This reduces energy consumption and costs.
Beacon II™ Refrigeration System
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
• 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!
Smart II software
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
Scroll® Compressors
Bohn condensing units are available with Copeland’s Scroll® compressor. Copeland’s Scroll® compressors are hermetically sealed so no service is required. The Scroll’s® ability to handle liquid refrigerant makes it extremely reliable and, in low temperature applications, liquid injection is provided to lower discharge temperatures under adverse conditions. Also, nuisance oil safety trips are eliminated because the Scroll® doesn’t require an oil pressure sensing device.
Electrical Options Mechanical Options
• Smart Defrost Kit™ (SDK)
• Crankcase heater on indoor units
• Mounted fused disconnect
• Fan cycling
• Low ambient kit (Heated & insulated receiver with low pressure cut-out time delay)
• Defrost timer for air defrost
• Defrost timer & contactor for electric defrost includes evaporator fan subfusing (Only the large 2 fan units have evaporator fan sub-fusing included as standard in the Electric Defrost kit)
• Beacon II™ kits (see Beacon II™ section for details)
• Bohnmizer® Kits (see Bohnmizer® section for details)
• Electric Defrost Fusing (includes evaporator fan fusing on 1 fan and 2 fan units)
• Dual-pressure control*
• Adjustable high pressure control with manual reset*
• Phase-loss monitor*
• Compressor fusing*
• Circuit breaker circuit protection for compressor, condenser fan and control circuit*
* Available on large two-fan cabinet only
• Head pressure valve on indoor units
• Mounted liquid line solenoid valve
• Replaceable core liquid line lter/drier
• Permanent suction line lter
• Replaceable core suction line lter
• Suction accumulator
• Oil separator
• Bohnguard™condenser coating
• Copper nned coil
• Oversized receiver
• Slanted louver for snowbelt regions (not available with indoor unit)
• 12" extended legs for snowbelt regions
• Hail guards
• NEMA contactors*
• Compressor unloading (one step)*
BOHNMIZER
®
THE BOHNMIZER® SYSTEM
The Bohnmizer® system is a complete factory furnished commercial refrigeration split system designed to operate properly regardless of climatic conditions. As the ambient temperature falls below 75° F, the head pressure is allowed to decrease in direct relationship to the ambient.
The heart of the system is the Bohnmizer® valve, whose design allows the proper amount of refrigerant to ow to the evaporator regardless of the valve inlet pressure. The Bohnmizer® valve also responds very rapidly to changes in suction temperature, which assures the maintenance of low superheat, regardless of the ambient temperature.
The Bohnmizer® system concept results in operational energy savings, increased compressor life, reduced refrigerant costs and less maintenance expense.
ENERGY SAVINGS - SCROLL® CONDENSING UNITS
The compressor is the largest energy user in a refrigeration system. With the Bohnmizer® system the compressor is allowed to operate at a lower average discharge pressure over an annual cycle which requires less energy. This means less money to run the system. An appreciable dierence in your energy bill can be seen.
After extensive laboratory testing, Bohn has developed charts to assist you in determining the savings. The results of these calculations are shown in the following graphs: the graph for low temperature rooms and the graph for medium temperature rooms. To determine your savings simply enter the average annual outdoor air temperature for your area and draw a vertical line up to the system number curve, then over to the savings per year line. These savings are based on 7.5¢/kWh.
If your energy cost or room temperature is dierent, simply multiply the savings gure by the factor obtained from the table. See the example provided.
Example: Size 10 hp System
-10°F Room Temperature 55°F Average Outdoor Air Temperature $.10 cost per kWh
ADVANTAGES
• NO EXTRA REFRIGERANT REQUIRED
The charge for summertime operation serves year round.
• INSTANT START-UP
Regardless of outdoor ambient, Bohnmizer® starts in response to room thermostat.
• THE EVAPORATOR OPERATES MORE EFFICIENTLY YEAR ROUND
No icing in the winter - low head pressure is no problem for Bohnmizer®.
• LONGER COMPRESSOR LIFE
Lower head pressure means lower average compression ratio, and lower discharge gas temperatures.
The precise refrigerant control prevents liquid slugging.
Crankcase heater prevents condensation of refrigerant in the crankcase.
Savings Per Year $810 Correction Factor 1.33
Corrected Savings Per Year $1077
Loading...
+ 14 hidden pages