Water-cooled Screw chillers by Voltas Limited

More catalogs by Voltas Limited | Water-cooled Screw chillers | 40 pages | 2008-06-20

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Catalog Water-cooled Screw chillers

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Water-cooled Screw chillers is listed under these categories

Home & Garden > Heating Cooling & Air > Air Conditioners

Featured catalog pages of Water-cooled Screw chillers

advanced microcomputer control is a standard feature on all dunham-bush rotary screw water cooled chillers monitoring analog and digital inputs to achieve precise control of the major operational and protective functions of the unit direct digital control ddc allows finger-tip user interaction its simple-to-use push button keyboard and menu-driven software provide access to operating conditions control setpoints and alarm history clearly displayed on a prominent multi-line 80 character alphanumeric display an easy-to-install inexpensive modem option allows remote reading of operating parameter updates the dunham-bush microcomputer insures its owner stateof-the-art efficiency and reliability display information the 80 character alphanumeric liquid crystal display utilizes easy-to-understand menu-driven software inexperienced operators can quickly work through these menus to obtain the information they require or to modify control parameters more experienced operators can bypass the

dunham-bush rotary screw water-cooled chillers are designed for efficiency and reliability the rotary screw compressor is a positive displacement variable capacity compressor that will allow operation over a wide variety of conditions even at high head and low capacity a difficult condition for centrifugal compressors the rotary screw performs easily it is impossible for this positive displacement compressor to surge the refrigerant management system however is very similar to centrifugal water chillers and is shown in the refrigerant cycle diagram below liquid refrigerant enters the flooded evaporator uniformly where it absorbs heat from water flowing through the evaporator tubes the vaporized refrigerant is then drawn into the suction port of the compressor where the positive displacement compression begins this partially compressed gas is then joined by additional gas from the flash economizer as the rotors rotate past the vapor injection port at an intermediate pressure compressed

pressure drops wcfx-b 10-18

90 80 70 60 50 40 30 u1 t2,t3 v1 v2,v3 w1 w2 y1 pressure drop ft of water 20 15 10 9 8 7 6 5 4 3 2 100 200 300 400 500 600 700 800900 1000 1500 2000 water flow rate gpm evaporator 3 pass pressure drops wcfx-b 39-54

evaporator model match 1 pass 2 pass 3 pass 1 pass condenser 2 pass 3 pass wcfx model no 20 22 24 27 30 33 36 evap cond a r j1 h2 11-1/2 8 k1-k2 h1-h2 12 8 k1-k2 j1 12 8 j1 h1-h2 11-1/2 8 k1-k2 h1 12 8 k1-k2 j1-j2 12 8 l1 j1-j2 12 10 k1-k2 h2 12 8 k1-k2 j1-j2-j3 12 8 l1-l2 j1-j2-j3 12 10 l1-l2-l3 j1-j2-j3 12 10 l3 k1 12 10 l1-l2-l3 j2-j3 12 10 l2-l3 k1-k2 12 10 m1 k1-k2 12-1/2 12 m2 l1 12-1/2 12 l2-l3 j3 12 10 l2-l3 k1-k2 12 10 m1-m2 k1-k2 12-1/2 12 m1-m2-m3 l1-l2 12-1/2 12 l3 k1-k2 12 10 m1-m2 k1-k2 12-1/2 12 m1-m2-m3 l1-l2 12-1/2 12 a 11-7/8 12-1/4 12-1/4 11-7/8 12-1/4 12-1/4 12-3/8 12-1/4 12-1/4 12-3/8 12-3/8 12-3/8 12-3/8 12-3/8 12-3/8 12-3/8 12-3/8 12-3/8 12-3/8 12-3/8 12-3/8 12-3/8 12-3/8 a1 11-7/8 12-1/4 12-1/4 11-7/8 12-1/4 12-1/4 18-3/8 12-1/4 12-1/4 18-3/8 18-3/8 18-3/8 18-3/8 18-3/8 12-3/8 12-3/8 18-3/8 18-3/8 12-3/8 12-3/8 18-3/8 12-3/8 12-3/8 r 6 6 6 6 6 6 8 6 6 8 8 8 8 8 8 8 8 8 8 8 8 8 8 a 9-7/8 10-1/2 10-1/2 9-7/8 10-1/2 10-1/2 10-3/8 10-1/2 10-1/2 10-3/8 10-3/8 10-3/8

wcfx 10 12 15 18 unit model nominal tons compressor rpm electrical information compressor rla each 1st step inrush each lra each unit mca min circuit ampacity mfs max allowable fuse size evaporator model design press water side psig design press refrig side psig water volume gallons min gpm 1 pass min gpm 2 pass min gpm 3 pass max gpm 1 pass max gpm 2 pass max gpm 3 pass condenser model design press water side psig design press refrig side psig water volume gallons min gpm 1 pass min gpm 2 pass min gpm 3 pass max gpm 1 pass max gpm 2 pass max gpm 3 pass general information shipping wt lb operating wt lb approx refrig charge lb r-22 3272 3571 160 3781 4157 192 4598 5078 240 5186 5745 288 10arb1a1 100 1210 3500 ar 460v 98 252 652 123 200 b1 150 300 17 149 74 50 743 372 248 a1 150 300 19 183 92 61 900 459 306 12arc1a2 120 1212 3500 ar 460v 125 310 780 157 250 c1 150 300 23 192 96 64 958 479 319 a2 150 300 22 227 114 76 900 569 325 15ard1b1 150 1215 3500 ar 460v 155 398 1030 194 300 d1

wcfx 10-18 to power supply l1 l2 l3 termnal block ground lug 1m2 1m2ol 1m1 control transformer 1mtr a compressor motor b c undervoltage relay 3fu 1fu 2l1 2fu 2l2 2l3 wcfx 20-54 two compressors shown typical of three to power supply l1 l2 l3 termnal block ground lug 1l1 1l2 1l3 1m1 2m2 2m2ol 1cb circuit breaker 2l1 2l2 2l3 2m1 2fu 1m2 1m2ol 1mtr compressor motors wcfx 10-18 1l1 to power supply 1l2 1l3 1fu 2fu 2l1 2l2 2l3 3fu unit fuse block ground disconnect switch with handle 1m2 1m2ol 1m1 a b c undervoltage relay 1mtr control transformer compressor motor wcfx 20-54 two compressors shown typical of three 1fu to power supply s2 rotary switch 4l1 2fu 4l2 4l3 unit fuse block ground 1m2 1m20l 1l1 1l2 1l3 1cb circuit breaker w/handle 2l1 2l2 2l3 2cb circuit breaker w/handle 3fu 1m1 2m2 2m20l 2m1 1mtr compressor motors 2mtr a b c undervoltage relay 26 fused disconnect option power wiring 1t 1fu 4l1 4l2 4l3 3fu 2cb circuit breaker 1t 1kva control transformer 2mtr a b c undervoltage relay 1t

the dunham-bush rotary screw water-cooled chiller can significantly reduce building operating costs when the heat recovery option is selected any building which requires simultaneous heating and cooling may be an excellent candidate for this system hotter hot water most centrifugal water chillers are limited in producing leaving condenser water temperatures to 105°f or below dunham-bush rotary screw water-cooled chillers are able to provide leaving water temperatures over 120°f allowing for the installation of smaller heating coils at a lower first cost than systems utilizing centrifugal water chillers the warmer supply air temperatures available will also improve tenant comfort greater design flexibility centrifugal water chillers must be selected very carefully in order to accomplish a successful installation they are very susceptible to surge and stall conditions during partload operation and must be selected to operate in a narrow operating envelope the heat recovery dunham-bush

dunham-bush rotary screw water-cooled chillers like many other dunham-bush products distinguish themselves by offering as standard many features that other manufacturers provide only as costly options some of the standard features of these chillers which provide for efficiency and reliability are · two year warranty on compressors and parts · unit mounted and wired reduced inrush starting system · factory mounted and wired control power transformer · single point electrical power connection · undervoltage phase failure relay · microprocessor monitoring of cooler leaving water temperature · microprocessor monitoring of suction discharge pressures · microprocessor monitoring of power supply volts dunham-bush offers many factory installed and tested options for custom solutions to everyday owner and operator special requirements flanged water connections fwc for the cooler and condenser inlet and outlet systems international display sid provides microcomputer controller

2.07 oil system the compressors shall be lubricated by means of differential pressure with an oil recovery system an oil filter with replaceable core filter shall be provided to filter 100 of the oil supplied to the compressors the flooded cooler is to be supplied with an oil recovery and equalization system on multiple compressor models that will ensure the cooler will operate at peak efficiency at all times including extended periods of part load operation condenser the condenser shell shall be fabricated from carbon steel with welded tubesheets machined from heavy carbon steel tubes shall be enhanced inner and outer surface seamless copper mechanically expanded into the heavy carbon steel tubesheets removable heads shall be supplied for cleaning and servicing of condenser tubes vent and drain plugs shall be provided in each head they shall be available in two or three pass configuration as required on the schedule or drawings with victaulic or optional flanged connections fluid