Pump Supply Pressure
Purpose: Some chiller designs use a centrifugal pump. For a centrifugal pump to run properly it
needs some restriction in the piping system to push against the pump and generate pressure. If this
does not happen the chiller may stop and show a Pump Low Pressure fault.
To correct this, follow the procedure below.
1. Slightly close a ball valve or other type of metering valve on the external piping circuit
2. Cycle the ON/OFF switch on the chiller
3. Observe the pump supply pressure on the controller display, it should be higher than before
4. If the chiller faults again on Pump Low Pressure, repeat steps 1-3 until the Pump Low Pressure
fault no longer occurs
Note: When partially closing a ball valve from a fully open position, it is normal to see no change in
operating pressure until the handle is adjusted a significant amount.
Contact Haskris for help: Haskris is available to review pressure adjustments.
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