Refrigerant Limits on Advantage Portable and Central Water Chillers

  • Advantage portable and central water chillers use high pressure and low pressure limit switches on the refrigerant circuit to prevent circuit damage due to out-of-spec operating pressure.
  • Depending on the model of the Advantage chiller, separate high and low limit switches could be used (as pictured) or high and low limit switches in a common housing.
  • Refrigerant limit switches are wired into the 115 volt control circuit of the compressor.
  • Both high and low switches are normally closed.
  • If either limit switch detects a pressure outside its prescribe parameter, the limit switch will open the control circuit and the compressor will stop.
  • High Pressure Limit Switch
  • High Pressure
  • Mounted on the discharge side of the compressor.
  • Optimal refrigerant high pressure in Advantage water chillers is 210 PSI.
  • High pressure limit switches will cut-out at 325 PSI.
  • There is no allowable field adjustment of the high pressure limit switch.
  • If the chiller cuts out on the high pressure limit the cause must be isolated and corrected before operations can resume.
  • Low Pressure Limit Switch
  • Low Pressure
  • Mounted on the suction side of the compressor.
  • Low pressure fluctuates with process water temperature.
  • Field adjustments of the low pressure limit switch are allowed when setpoint below 48°F are required.
  • Typical use of refrigerant pressure limit switches on Advantage central chillers.
  • Limit Switches
  • The high and low pressure limit switches are connected to the refrigerant circuit, which is pressurized at all times.
  • Only a qualified refrigeration technician should service the high and low pressure limit switches.

For more information about refrigerant limit switches call the Advantage Sales Department at 317-887-0729.

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