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JEFFERSONVILLE
                                                           
 

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CHILLER SERVICE

 

      All service work performed on the refrigeration system should be done by licensed and trained refrigeration service technicians only.

 

      Troubleshooting the chiller:

 Chiller will not start.

  • Check incoming voltage.
  • Check all fuses in circuit.
  • Check to see that the unit power switch is in the on position.
  • Check to see that the pump switch (if equipped) is on.
  • Verify proper oil or water flow is going through chiller.
  • Verify that the flow switch (if equipped) contacts are made.
  • Verify that the freeze-stat (if equipped) contacts are made.
  • Verify 24 VAC power is being supplied to digital controller.
  • Verify "output 1 and/or output 2" led lights are illuminated on display of controller. If no led's are lit, the chiller is not requiring cooling. If the fluid is not at the desired temperature, verify that the set-points are set to the correct setting.
  • Check high and low pressure safety shut-off switches for the refrigerant circuit and verify that the circuit is "closed".
  • Verify that the compressor motor has not overheated due to high amps or inlet fluid temperature.
  • Verify that the pump (if equipped) has not shut off due to overheating or closing of valves.

Chiller will not achieve temperature setting.

  • Confirm set-points on digital controller.
  • Verify that all refrigeration components are functioning properly.
  • Check refrigerant sight glass for "flashing" or bubbling of refrigerant. This may indicate a possible low charge of refrigerant. Check for leaks!!
  • Verify the condenser fan or fans are operating properly.
  • Confirm heat load does not exceed chiller capabilities.
  • Confirm acceptable fluid flow rates for chiller unit.
  • Does the fluid have air or bubbles in it? If it does, an air purging device is required to purge entrained air from the system. The chiller is not designed to cool air. Air in a water cooling system can lead to excessive freezing and possibly a ruptured heat exchanger. The freeze-stat safety device cannot detect freezing conditions when air is present in the water circuit.
  • Has the heat exchanger become clogged? If so, clean with a back flushing or citric or phosphoric acid and water.
  • Is the set-point above 90 deg F? If yes, does the chiller contain a de-superheating circuit to keep the compressor cool?
  • Verify the proper voltage, phase, and cycles for the electrical circuit. NOTE: 50 Hz is 17% less efficient than 60 Hz.