Refrigerant Limits on Advantage Portable and Central Water Chillers
- FYI #157
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.
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
- 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.
- 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 parameters, the limit switch will open the control circuit and the compressor will stop.
- 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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