Energy Saving Machines

CWT Series air-cooled fluid chillers maximize energy savings in applications with varying load conditions through the use of multiple compressors in units rated up to 35 tons. All models operate on 460/3/60 power supply, are suitable for outdoor installation, and are equipped with variable speed condenser fans and washable stainless steel condenser filters. The standard fluid circuit includes an insulated carbon steel pressurized tank, pump, strainer, and isolation valves. Among the available options are non-ferrous fluid circuit, unpressurized tank, alternate pressure pumps, duplex pumps, wheel kit, and remote control operating panel. Like all of our chillers, every unit is factory tested to confirm full load performance and proper operation of all controls, safety devices, and alarms.

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CWT chiller
CWT chiller

FLUID CIRCUIT

  • Standard carbon steel (pressurized) tank is thermally insulated
  • Tank equipped with expansion vessel, safety valve, automatic vent
    valve, and drain valve
  • Optional atmospheric (unpressurized) tank
  • Stainless steel, thermally insulated pump
  • Optional automatic bypass protects pump from damage if fluid circuit
    is blocked
  • Fluid differential pressure switch protects against low-flow condition
  • Inlet Y strainer
  • Fluid pressure gauge (pump discharge)
  • Ability to use glycol mixtures up to 50%

REFRIGERATION CIRCUIT

  • Manufactured with high-quality materials following rigorous brazing procedures and conforming to international standards (PED 97/23/EC)
  • Environmentally friendly R410A refrigerant
  • Refrigerant sight glass with moisture indicator and filter-dryer
  • Externally equalized thermostatic expansion valve
  • High pressure switch and low pressure transducer
  • High and low pressure gauges
  • High and low pressure access fittings for maintenance and troubleshooting
  • Multi-compressor units include discharge check valves

COMPRESSOR

  • Multiple compressors (CWT030 & up) for energy efficiency and
    low starting current
  • Rotary (CWT010) and scroll compressors chosen for reliability
    and efficiency
  • Mounted on rubber isolators for noise reduction
  • Scroll compressors are especially quiet and can handle liquid return without damage
  • Protected against reverse rotation by an electronic phase monitor
  • Crankcase heater prevents liquid slugging on start-up

EVAPORATOR

  • Stainless steel, brazed plate evaporators are compact and highly efficient
  • Evaporators are protected against freezing by the microprocessor controller

CONDENSER

  • Microchannel design is compact and highly efficient
  • All-aluminum construction eliminates the risk of galvanic corrosion
  • Cleanable, stainless steel air filter
  • Optional epoxy-coating for corrosion resistance, even in aggressive environments
  • Condenser fan motor includes internal, self-resetting thermal protector
  • Variable-speed fan allows operation over a wide ambient temperature range

ELECTRICAL PANEL

  • Manufactured in compliance with international standards
    (EN 60204) using UL-recognized components
  • Electrical cabinet constructed of powder-coated galvanized steel
  • Disconnect switch with door lock prevents access to panel when energized

MICROPROCESSOR CONTROLLER

  • Optimizes unit performance and maintains fluid temperature
  • Controls and displays the fluid temperature
  • Turns the compressor(s) on and off while protecting against short cycling
  • Turns the pump(s) on and off; equalizes pump operating times
    (double pump models)
  • Regulates condenser fan speed
  • Implements emergency capacity control (for multi-compressor units)
    if ambient or fluid temperature exceeds operating limits
  • Protected by a watertight cover
  • Displays key operating parameters and the following alarm conditions
    • High and low refrigerant pressure
    • Low fluid differential pressure
    • Incorrect phase sequence
    • Compressor, pump, or fan motor protector tripped
    • Temperature or pressure probe failure
    • High fluid temperature
    • Evaporator anti-freeze
  • Optional remote control panel

UNIT CONSTRUCTION AND MAINTENANCE

  • Cabinet frame and panels are powder-coated and suitable for outdoor installation
  • Panels are easily removed, providing convenient access for maintenance and repair
  • All fasteners are stainless or zinc-plated steel for corrosion resistance
  • Protection to IP44 standard on all models; suitable for outdoor installation
  • Wheel kits and feet are available for all models
  • Designed for ease of operation and maintenance

FACTORY TESTING OF EVERY CWT UNIT

  • Pressurization and helium leak detection of refrigeration circuit
  • Pressurization and leak testing of fluid circuit
  • Chiller performance and power consumption at full load
  • Proper operation of all controls, safety devices, and alarms
  • Electrical tests according to international standards (EN 60204)
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