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HWSC-D. Water -Cooled Chillers with Rotary Screw Compressors 50 to 300 Tons Features Rotary screw compressors Efficient performance Smooth, quiet operation Reduced maintenance expense . Form No. 5303C. SCREW COMPRESSORS REPRESENT GREATER VALUE. THROUGH EXPANDING TECHNOLOGY. The HWSC Outperforms Recips and capacity control allowing superior thermal expansion Centrifugals valve operation. Today's highly-competitive construction market forces engineers, contractors and equipment manufacturers to Unsurpassed Redundancy and Serviceability continually improve the value of their products and In addition to the reliable design, the HWSC offers more services. D-B's HWSC screw compressor chillers are back-up than any reciprocating or centrifugal chiller on an excellent example of innovative design, backed by the market today. Up to four compressors are offered, 30 years of air conditioning experience and thorough each with its own refrigeration system. In the unlikely testing. Neither reciprocating nor centrifugal event of a compressor failure, no other refrigerant compressors can match the screw compressor on a circuit is affected.

ARI CERTIFICATION ARI CERTIFICATION PROGRAM The performance of DB Water-Cooled Rotary Screw Water Chillers has been certified by the Air Conditioning and Refrigeration Institute (ARI).

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1 HWSC-D. Water -Cooled Chillers with Rotary Screw Compressors 50 to 300 Tons Features Rotary screw compressors Efficient performance Smooth, quiet operation Reduced maintenance expense . Form No. 5303C. SCREW COMPRESSORS REPRESENT GREATER VALUE. THROUGH EXPANDING TECHNOLOGY. The HWSC Outperforms Recips and capacity control allowing superior thermal expansion Centrifugals valve operation. Today's highly-competitive construction market forces engineers, contractors and equipment manufacturers to Unsurpassed Redundancy and Serviceability continually improve the value of their products and In addition to the reliable design, the HWSC offers more services. D-B's HWSC screw compressor chillers are back-up than any reciprocating or centrifugal chiller on an excellent example of innovative design, backed by the market today. Up to four compressors are offered, 30 years of air conditioning experience and thorough each with its own refrigeration system. In the unlikely testing. Neither reciprocating nor centrifugal event of a compressor failure, no other refrigerant compressors can match the screw compressor on a circuit is affected.

2 This basically means up to 75%. first cost versus performance analysis. back-up is provided on all components including most controls. Add to this a design which allows easy Lower First Cost replacement of compressors and heat exchangers D-B HWSC chillers are available in a compact package (none are welded in place) and easy maintenance up to 300 tons allowing easier installation and smaller requirements which are virtually identical to the equipment rooms. The multiple compressor, staggered requirements of reciprocating chillers. start design, combined with modulating capacity control, eliminates the need for expensive starters and The reliability and redundancy offered by the HWSC is hot gas bypass. The two-pole compressor motor allows ideal for critical installations. a .91 power factor without the use of correction capacitors. Optional single-source power minimizes Quiet Operation electrical installation and full factory run testing This compressor is, quite simply, the quietest guarantees trouble free start-up.

3 And, best of all, compressor in its size range. The inherently balanced redundancy is built in above 75 tons, in contrast to compression results in a compressor vibration centrifugal designs which require tremendous amplitude of only 7 microns. The compressor noise premiums for compressor back-up. also occurs at a higher vibration frequency allowing effective attenuation by the optional compressor Higher Operating Efficiencies acoustical enclosure and by equipment room walls. Due to efficiencies of screw compressors, the HWSC The screw compressor is quieter than competitive chillers offer significant energy savings. Full load screw compressors due to the ribbed, double wall efficiencies of approximately .80 KW/ton are offered. construction and the greater amount of rotor surface However, the major savings occur during part load area. operation due to the modulating compressor control, preventing overcooling associated with stepped control, Infinitely Modulating Capacity Control and the multiple compressor design which allows Precise control of leaving Water temperature is unnecessary compressors to be cycled off.

4 In fact, four maintained by the screw compressor modulating slide compressor HWSC units allow capacity reduction down valve, in combination with a microprocessor based to of design without requiring energy wasting, hot supply Water temperature controller. gas bypass. Due to part load savings, the HWSC offers lower energy costs than centrifugal chillers if a Leaving Water temperature variations are controlled to substantial amount of part load operation is required. less than 1/2(F accuracy; five times the accuracy of reciprocating compressors. Maintaining constant Greater Reliability supply Water temperature allows much closer control of Screw compressors are inherently reliable since they comfort conditions. use approximately 1/10 the moving parts of reciprocating compressors. Reliability is further Reduced Maintenance Expense enhanced by utilizing suction gas to cool the motor and Screw compressor chiller maintenance is almost non- actual compressor pressure differential to force feed oil existent due to the reliability in design and, when to the bearings and rotors.)

5 This eliminates required, is virtually identical to the requirements of maintenance-prone oil pumps and liquid injection reciprocating compressors. Centrifugal chillers, in cooling. The compressor is further protected by a full contrast, require very specialized and proprietary set of safety controls. Another outstanding attribute is maintenance. Most centrifugal chillers also utilize the screw compressor's tremendous resistance to negative pressure refrigeration systems which involve damage from liquid slugging which is the major cause a significant expense in lost refrigerant due to periodic of reciprocating compressor failures. This slugging purging of contaminants. When all of these extra resistance is the result of the suction cooled motor, centrifugal maintenance expenses are taken into superheating the refrigerant, the structural integrity of account, it becomes apparent that the HWSC offers a the rotors as compared to pistons, and the modulating lower total operating cost than any competitive alternative.

6 2. ARI CERTIFICATION. ARI CERTIFICATION. PROGRAM. The performance of DB Water -Cooled Rotary Screw Water Chillers has been certified by the Air Computer Performance Ratings Conditioning and Refrigeration Institute (ARI). D-B HWSC Water -Cooled Rotary Screw Water Chillers are available from 50 to 300 tons. A chiller may be Full load ratings, part load ratings, and Water pressure custom matched to specific building requirements by drop data are regularly tested under this program and your D-B Sales Representative utilizing the HWSC. are certified in accordance with ARI Standard 550/590- Computer Selection Program which has ratings which 98. This provides an independent, third party are certified in acordance with ARI Standard 550/590- verification of Water chiller performance with a 98. Data which can be provided to you will include: laboratory-grade performance test utilizing chiller Capacity instrumentation which has calibration traced to the KW Input National Bureau of Standards.

7 Evaporator and Condenser Water Pressure Drop The ARI Seal of Certification on each and every D-B Part-Load Performance HWSC chiller shows our commitment to quality and to Contact your local D-B Sales Representative to discuss our customer's peace of mind. You know you'll get the what Custom Solutions D-B can offer to solve your industry's standard for efficiency and reliability when chiller selection questions. you purchase a D-B Water chiller . PHYSICAL DATA. MODELS HWSC-50 THRU 150. Model HWSC 50 60 75 100 110 120 135 150. Nominal Capacity - Tons 45 55 64 89 99 109 121 130. SEMI-HERMETIC SCREW TYPE COMPRESSORS. No. of Compressors 1 1 1 2 2 2 2 2. Nominal Size (HP) 50 60 75 (2)50 50-60 (2)60 60-75 (2)75. Oil Charge (Oz.) 202 236 236 (2)202 (1)202(1)236 (2)236 (2)236 (2)236. Crankcase Heater (Watts) 200 200 200 (2)200 (2)200 (2)200 (2)200 (2)200. COOLER. Storage Capacity (Gal.) Diameter x Length 860 1060 1160 1360 12102 12102 14102 14102. CONDENSERS. No. of Condensers 1 1 1 2 2 2 2 2.

8 Diameter x Length 1279 1279 1279 1279 1279 1279 1279 1279. UNIT. Refrigerant Charge - R22 (Lbs.) 70 73 100 150 170 175 190 200. Net Weight (Lbs.) 2500 2900 3600 4700 5150 6200 7000 7500. MODELS HWSC-180 THRU 300. Model HWSC 180 210 225 240 255 270 300. Nominal Capacity - Tons 165 184 193 218 226 236 256. SEMI-HERMETIC SCREW TYPE COMPRESSORS. No. of Compressors 3 3 3 4 4 4 4. Nominal Size (HP) (3)60 (1)60(2)75 (3)75 (4)60 (3)60(1)75 (2)60(2)75 (4)75. Oil Charge (Oz.) (3)236 (3)236 (3)236 (4)236 (4)236 (4)236 (4)236. Crankcase Heater (Watts) (3)200 (3)200 (3)200 (4)200 (4)200 (4)200 (4)200. COOLER. Storage Capacity (Gal.) Diameter x Length 18122 18122 18122 20122 20122 20122 20122. CONDENSERS. No. of Condensers 3 3 3 4 4 4 4. Diameter x Length 1279 1279 1279 1279 1279 1279 1279. UNIT. Refrigerant Charge - R22 (Lbs.) 216 248 264 288 304 320 352. Net Weight (Lbs.) 10500 11500 12000 13000 13500 14000 14500. 4. HWSC ELECTRICAL DATA (50 - 150). (Consult Dunham-Bush for 208-230 Volt Data).

9 COMPRESSORS RECOMMENDED. RATED LOAD AMPS LOCKED ROTOR AMPS. Volts Type MOTOR NO. MOTOR NO. Minimum Wire Max. Model 60 Hz of Circuit Size Fuse HWSC 3 Ph. Start 1 2 1 2 Ampacity Size 460 XL 64 - 422 - 80 4 125. 50. 460 Y-D 64 - 141 - 80 4 125. 460 XL 78 - 485 - 98 3 150. 60. 460 Y-D 78 - 162 - 98 3 150. 460 XL 95 - 539 - 119 1 175. 75. 460 Y-D 95 - 180 - 119 1 175. 460 XL 64 64 422 422 144 0 175. 100. 460 Y-D 64 64 141 141 144 0 175. 460 XL 78 64 485 422 162 00 200. 110. 460 Y-D 78 64 162 141 162 00 200. 460 XL 78 78 485 485 176 00 225. 120. 460 Y-D 78 78 162 162 176 00 225. 460 XL 95 78 539 485 197 000 250. 135. 460 Y-D 95 78 180 162 197 000 250. 150 460 XL 95 95 539 539 214 0000 300. 46O Y-D 95 95 180 180 214 0000 300. HWSC ELECTRICAL DATA (180-300). COMPRESSORS Minimum Minimum Maximum Circuit Wire Fuse Volts Type RATED LOAD AMPS LOCKED ROTOR AMPS Ampacity Size Size 60 HZ of MOTOR NO. MOTOR NO. Model 3 PH. Unit HWSC 1 2 3 4 1 2 3 4 460 XL 78 78 78 - 485 485 485 - 254 300 300.

10 180. 460 Y-D 78 78 78 - 162 162 162 - 254 300 300. 460 XL 95 95 78 - 539 539 485 - 292 350 350. 210. 460 Y-D 95 95 78 - 180 180 162 - 292 350 350. 460 XL 95 95 95 - 539 539 539 - 309 350 400. 225. 460 Y-D 95 95 95 - 180 180 180 - 309 350 400. 460 XL 78 78 78 78 485 485 485 485 332 400 400. 240. 460 Y-D 78 78 78 78 162 162 162 162 332 400 400. 460 XL 95 78 78 78 539 485 485 485 353 500 400. 255. 460 Y-D 95 78 78 78 180 162 162 162 353 500 400. 460 XL 95 95 78 78 539 539 485 485 370 500 450. 270. 460 Y-D 95 95 78 78 180 180 162 162 370 500 450. 460 XL 95 95 95 95 539 539 539 539 404 (2)300 450. 300. 460 Y-D 95 95 95 95 180 180 180 180 404 (2)300 450. NOTES: 1. XL: Across the line; Y-D: Star-Delta. 2. RLA (Rated Load Amps) rated. 3. Starting current for normal Y-D start is shown. In certain compressor failure modes, Y-D inrush can be as high as XL inrush. 4. Wire Size Amps equal 125% of the rated load amps for the largest motor in the circuit plus 100% of the rated load amps for all other motors in the circuit, per 5.


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