Transcription
BN-ACCTG NOVEMBER 2020Replaces October 2016AIR COOLED CONDENSERSTechnical GuideModels DVT
TABLE OF CONTENTSOverview. 2, 3Features & Options. 3, 4Nomenclature.3Four Solutions.5Condenser Selection Procedure.6-8Fixed Speed A/C Series540 RPM .9-12830 RPM (1.0 HP).13-16830 RPM (1.5 HP).17-201140 RPM .21-24VSEC InformationECCSelection . 25Sound Data . 25Energy Comparison . 26OVERVIEWThe Bohn VSEC and 3-Phase A/C Series of direct driveair-cooled condensers incorporate the latest condensertechnology to provide the quietest and most efficientcondensers in the industry.VSEC SeriesOptimized sound and energy performance.The VSEC Series of condensers by Bohn offers theoptimum solution for sound and energy performance.The VSEC Series utilizes variable speed EC (VSEC)motor technology, which provides unmatched soundand energy performance and is the perfect solutionfor those applications where low noise levels andsignificant energy savings are essential for success.VSEC Series830 RPM (Rail Mounted) . 27-301140 RPM (Rail Mounted).31-34Venturi Mounted.35-38.Additional InformationDimensions. 39Fan Cycling .40-41Condenser Refrigerant Charge .42-44Calculate Refrigerant Charge . 44Typical Condenser Wiring Diagrams .45-46Sound Data . 473-Phase A/C SeriesExcellence in sound, energyand capacity solutions.The 3-Phase A/C Series of condensers by Bohn isdesigned specifically with the growing needs of thesupermarket and grocery industry in mind. This seriesutilizes 830 and 540 RPM motors and incorporatesadvanced features that further improve sound levelsand energy efficiencies, as well as provide increasedcapacity in a smaller footprint. In addition, there arenew features designed to improve serviceability,resulting in reduced maintenance costs.The 3-Phase A/C Series is a perfect fit for applicationsrequiring low sound and energy levels andoptimized capacities.1140 SeriesBohn continues to offer the 1140 RPM Series forcustomers seeking the most economical solution fortheir capacity requirements.Bohn condensers now incorporate a broader productrange with capacities ranging from 11 to 265 nominaltons to address all applications.Since product improvement is a continuing effort, we reservethe right to make changes in specifications without notice.2All Bohn condenser coils incorporate the Floating Tubecoil design, which virtually eliminates the possibilityof tube sheet leaks. Condenser coils are designed formaximum heat transfer and are designed to operatewith most common refrigerants. 2020 Heatcraft Refrigeration Products LLC
OVERVIEW (continued)As with all Bohn products, extensive testing of thecondenser ensures long and trouble-free service life.The condensers are designed for outdoor applicationswith housings available in aluminum finish and paintedor unpainted galvanized steel.The condensers are available in either single or doublewide fan configurations.The condenser design incorporates the features mostdesired in air-cooled condensers. An extensive list ofoptions and fan cycle control panels complement thecondenser design and allow the condenser to match themost rigid application requirements.The Floating Tube Coil DesignDramatically Reduces Tube Sheet LeaksFEATURESThe Bohn air-cooled condenser is available in multipleproduct tiers and is designed with features to meetspecific customer requirements.Bohn Venturi Mounted VSEC Series of CondensersCustomers seeking optimum sound and energyperformance can select the Bohn VSEC Series ofcondensers with variable speed EC motor technology.VSEC motors provide unparalleled sound and energyperformance.Features include: VSEC motor, swept fan blade and Venturiincorporating integrated variable speed technology Broad capacity range from 16 to 264 tons Aluminum housing for an attractive appearance andcorrosion protection, with painted galvanized steel,or galvanized steel available as an optionVenturi Mounted VSEC Series with VSEC Motor Technology Side access panels allow for ease of cleaning coilsNOMENCLATUREBNH––S04A050Standard Capacity(MBH/ TD, R-22 @ 10 FPI)B - BohnN – VintageMotorH - 1140 RPM 1.5 HPL - 830 RPM, 1.5 HPX - 830 RPM, 1.0 HPQ - 540 RPM, 0.5 HPE - Venturi Mounted VSEC, 2.0 kWJ - Rail Mounted VSEC, 830 RPM, 1.1 kWK - Rail Mounted VSEC, 1140 RPM, 2.0 kWModel IdentifierFans01-14WidthS – Single WideD – Double Wide3
Bohn 3-Phase A/C Series of CondensersThe 3-Phase A/C Series by Bohn is designedspecifically with the growing needs of thesupermarket and grocery industry in mind.This series utilizes 830 and 540 RPM motors andincorporates advanced features that further improvesound levels and energy efficiencies, as well as provideincreased capacity in a smaller footprint. In addition,there are new features designed to improve serviceability,resulting in reduced maintenance costs. The 3-Phase A/CSeries is a perfect fit for applications requiring low soundand energy levels and optimized capacities.Features include: Direct drive fan motors in 830 or 540 RPM The patented QuietEdge fan blade provides anunprecedented sound level of 49.6 dBA (540 RPM @ 10 ft.) The Bohn patented (#7, 210, 661) ServiceEase motormount feature allows for ease of motor service andreduces likelihood of damage to the coils duringservicing Bohn condenser coils incorporate the latest coiltechnology to provide maximum capacity Broader product range to address all applications.Capacities ranging from 11 to 225 nominal tons Galvanized steel cabinet with the option foraluminum or painted galvanized steel High efficiency, three-phase fan motors with ballbearings and internal overload protection1140 SeriesFor customers seeking an economical solution totheir capacity needs, Bohn now offers the 1140 RPMSeries with enhancements to improve capacity andserviceability.Bohn's Patented QuietEdge Fan Blade forImproved Sound PerformanceFeatures include: Direct drive fan motors The Bohn patented (#7, 210, 661) ServiceEase motormount High efficiency condenser coil designed for optimumperformance Expanded product range from 15 to 249 nominal tons Galvanized steel as a standard housing, with an optionfor aluminum or painted galvanized steel High efficiency, three-phase fan motors with ballbearings and internal overload protectionAll Standard Condensers 10 fins per inch spacing Modular design with models in both single anddouble wide fan configurations All Bohn condensers incorporate the Floating Tubecoil design, which virtually eliminates tube sheet leaks Internal baffles provided between all fan cells Condensers up to 3 fans in length use 3/8” diametertube to minimize refrigerant charge. Condensers4 or more fans in length use 1/2" diameter tube tominimize refrigerant pressure drop Coated steel fan guards Weatherproof control panel with factory-mounteddoor interrupt disconnect switch UL and UL listed for CanadaAvailable Options: Multi-circuiting at no additional charge Optional 8, 12 or 14 FPI spacing Fan-cycle control panels Alternate coil construction including BohnGuard coatedfins, epoxy or phenolic coated fins and copper fins Hinged fan panels for ease of servicing (3-Phase A/Cand 1140 Series only) Side access panels Extended condenser legs for increased ground clearance Sealtite wiringServiceEase Motor Mount System4 Frame for shipping
Four Solutions Tailored To Fit Your Unique NeedsChoose from Fixed Speed, Rail Mounted VSEC, or Venturi Mounted VSEC series ofair-cooled condensers by Bohn. Choosing the Venturi Mounted VSEC Series means thatyou are selecting the ultimate in capacity, sound, and efficiency. The Rail Mounted VSECoption offers all of the benefits of variable speed in a conventional condenser package,while the fixed speed options continue to provide proven performance and capacity.1140 RPMFIXED SPEED830 & 540 RPMFIXED SPEEDRAIL MOUNTEDVSECVENTURIMOUNTED VSEC1140 RPM830, 540 RPMVariable SpeedEC MotorsVariable SpeedEC MotorsppStandard nized Option(standard)(standard)(standard)pPre-Painted Galvanized OptionppppAluminum Optionppp(standard)RemovableRemovableRemovableEC TallOptimizedppp-StandardQuietEdge Standard/QuietEdge TMEC OptimizedService Ease Service Ease Service Ease EC OptimizedppppTwo-Year Warranty - Rail Mounted VSEC Motors--p-Three-Year Warranty - Venturi Mounted VSEC Motors---pppppFEATUREMotorsStandard MotorP66 Motor OptionCabinetVenturi CoverStandard VenturiHinged OptionFan BladesStandard BladeMotor MountedStandard Motor MountedWarrantyTwo-Year WarrantyFive-Year Warranty - Floating Tube Coil Design5
Condenser SelectionCapacity for air-cooled condensers are based on Total Heat of Rejection (THR)at the condenser. Total heat of rejection is equal to net refrigeration at theevaporator (compressor capacity) plus the energy input into the refrigerantby the compressor (heat of compression). The heat of compression willvary depending on the compressor manufacturer, type of compressorand the operating conditions of the compressor. Whenever possible, it isrecommended that you obtain the heat of compression value from thecompressor manufacturer.Step 3: Calculate Design Condenser T.D.If this is not available, the THR can be estimated using the following formula:THR (MBH) 476,595 / 1,000 476.6THR (MBH/ TD) 476.6 / 20 23.83Locate the 10 FPI column for R-22 refrigerant and read down until you locate avalue equal to or just larger than 23.83. This value is 25.9. Read horizontally tothe left to obtain a condenser model of BNQ-S05-A026.THR (Compressor Capacity) * (Heat of Compression Factor, Tables 1 & 2)Table 1 contains heat of compression factors for suction cooled compressorsand Table 2 contains factors for open drive compressors. For refrigerationsystems beyond the range of Tables 1 and 2, use the following equations toestimate THR:Design Condenser T.D. Condensing Temp — Ambient Temp 115 - 95 20 T.D.Step 4: Condenser SelectionCondenser capacities for condensers at 540 RPM are located in Table 7.These capacities are given in MBH/ TD. Convert the THR calculated in step 2to MBH/ TD by dividing by 1,000 to get THR in MBH. Then divide the THR bythe design TD to get MBH/ TD.Step 5: Calculate Actual T.D. and Condensing TemperatureThe compressor capacity is effected by its altitude. If the condenser locationis above sea level, an additional correction is required to the THR, as follows:The actual condenser T.D. can be calculated by dividing the design THR bythe condenser rating.Actual T.D. THR (Design) / (Rating @ 1 T.D.) 476.6 / 25.9 18.4 F. T.D.The actual condensing temperature is the actual T.D. plus the ambienttemperature. Actual Condensing Temperature (Actual T.D.) (Ambient) 18.4 95 113.4 F.THR (altitude) THR * Altitude Correction Factor, Table 3Table 1. Heat of Compression Factor for Suction Cooled CompressorsOpen Compressors:THR Compressor Capacity (BTUH) (2545) * (Brake Horsepower, BHP)Suction Cooled Compressors:THR Compressor Capacity (BTUH) (3413 * KW)Selection ExampleCompressor capacity:Evaporator temperature:Condensing temperature:Ambient temperatureRefrigerant:Compressor type:Condenser type:Condenser altitude:350,000 25 F115 F95 FR-22Semi-hermetic, suction cooled540 RPM, one row of fans1,000 feetStep 1: Estimate Condenser THRFrom Table 1 for suction cooled compressors, at 25 F suction, we need todetermine the heat of compression factor for 115 F condensing temperature(NOT shown in table).Therefore, select the condensing temperatures and heat of compressionfactor for 25 F suction temperatures as followsFrom Table 1:110 1.31115 X90 100 110 120 130 -40 -30 -20 -10 0 5 10 15 20 25 30 40 50 1.28Table 2. Heat of Compression Factor for Open Drive Compressors120 1.36Condensing TemperatureHeat of Compression FactorTo determine X: (Heat of Compression Factor)X 115-110 * (1.36 - 1.31) 1.31120-110X 5 * (0.05) 1.31X (0.025) 1.3110X 1.335Therefore heat of compression factor at 115 F condensing temperature is1.335THR Compressor Capacity * Heat of Compression Factor 350,000 * 1.335 467,250Step 2: Correct for AltitudeFrom Table 3 obtain an altitude correction factor of 1.02 for 1,000 feet.THR THR (from step 1) * Altitude Correction Factor (design) 467,250 * 1.02 476,5956Condensing Temperature FSuctionTemp. FEvaporatorTemp. F-30 -20 -10 0 5 10 15 20 25 30 40 50 Condensing Temperature F90 0 1.421.371.321.281.261.241.221.21.191.171.151.12110 1.471.421.371.321
maximum heat transfer and are designed to operate Since product improvement is a continuing effort, we reserve with most common refrigerants. the right to make changes in specifications without notice. 3. OVERVIEW (continued) The Bohn air-cooled condenser is available in multiple . product tiers and is designed with features to meet specific customer requirements. Bohn Venturi Mounted VSEC .
