Hypertherm DuraChill 5 HP Air-Cooled Chiller For Hypertherm - Manual (Page 22)

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7.9 Compressor Overload “Ft 20””
Resetting the High Refrigerant Pressure Safety Cutout
An excessive ambient and/or process heat load can cause the Chiller’s high refrigerant pressure safety cutout to
activate, removing power from the compressor and fan. The safety is factory-set to activate at a refrigerant pressure
of 630 PSI.
To reset the high refrigerant pressure safety cutout switch, proceed as follows:
1. Correct the condition causing the excessive head load.
2. Turn power to the Chiller OFF.
3. Remove the Chiller’s right front side panel.
4. Locate the high refrigerant pressure safety cutout switch. It is located near the compressor discharge and has a
blue housing with red reset button.
5. Press the reset button on the top of the switch. There should be a tactile and/or audible click as it resets.
NOTE: Allow sufficient time (approximately 15 minutes) for the pressure in the refrigeration system to decrease
below 630 PSI before resetting the safety switch. If the reset action seems “soft” or the Chiller will not resume
operation on power up, it’s likely that the refrigerant pressure is still above the 630 PSI cutout value.
6. Replace the side panel.
7. Turn power to the Chiller back ON and resume normal operation.
NOTE: There is also a Low Refrigerant Pressure Safety Cutout in series with the High Pressure Cutout. This
cutout will reset by itself once the pressure rises above it’s trigger point. If this safety continues to cutout
contact a HVAC technician to troubleshoot the refrigeration system.
Section 8 – Service and Technical Support
If you have followed the troubleshooting steps outlined in Section 7 and your Chiller still fails to operate properly, contact
the supplier from whom the unit was purchased. Have the following information available for the customer service person:
•
Model, Serial Number, and Voltage (from side panel label)
•
Date of purchase and purchase order number
•
Supplier’s order number or invoice number
•
A summary of the problem