| Document type | Operation Guide |
|---|---|
| Document number | 160.75-O1 |
| Equipment | YK Centrifugal Chiller |
| Brand | YORK |
| Revised | 2025-04-25 |
| File size | 4.1 MB |
Fault codes in this document
Troubleshooting
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Leaving Chilled Liquid – Low Temperature Control | Safety control that shuts down the chiller. | Load continues to decrease after the pre-rotation vanes are entirely closed. | 15 | |
| Oil pressure safety cutout | Safety cutout that actuates and stops the system. | Excessive refrigerant absorbed in the oil during long idle periods; violent oil foaming as the pressure within the system is lowered on starting; if the foam reaches the oil pump suction, the bearing oil pressure fluctuates with a possible temporary loss of lubrication. | Actuates and stops the system. Refer to OptiView™ Control Center – Operation and Maintenance (Form 160.54-O1). | 23 |
| 1. Symptom: Abnormally high discharge pressure | The temperature difference between the condensing temperature and water off condenser is higher than normal. | Air in condenser. | 28 | |
| 1. Symptom: Abnormally high discharge pressure | The temperature difference between the condensing temperature and water off condenser is higher than normal. | Condenser tubes dirty or scaled. | Clean the condenser tubes. Check water conditioning. | 28 |
| 1. Symptom: Abnormally high discharge pressure | High discharge pressure. | High condenser water temperature. | Reduce the condenser water inlet temperature. Check the cooling tower and water circulation. | 28 |
| 1. Symptom: Abnormally high discharge pressure | The temperature difference between condenser water on and water off higher than normal, with normal evaporator pressure. | Insufficient condensing water flow. | Increase the quantity of water through the condenser to correct value. | 28 |
| 2. Symptom: Abnormally low suction pressure | Insufficient charge of refrigerant. | Check for leaks and charge refrigerant into the system. | 28 | |
| 2. Symptom: Abnormally low suction pressure | The temperature difference between the leaving chilled water and refrigerant in evaporator is greater than normal, with high discharge temperature. | Variable orifice problem. | Remove the obstruction. | 28 |
| 2. Symptom: Abnormally low suction pressure | The temperature difference between the leaving chilled water and refrigerant in the evaporator is greater than normal, with normal discharge temperature. | Evaporator tubes dirty or restricted. | Clean the evaporator tubes. | 28 |
| 2. Symptom: Abnormally low suction pressure | The temperature of chilled water is too low with low motor amperes. | Insufficient load for system capacity. | Check the pre-rotation vane motor operation and setting of the low water temperature cutout. | 28 |
| 3. Symptom: High evaporator pressure | Pre-rotation vanes fail to open. | Check the pre-rotation vane motor positioning circuit. | 28 | |
| 3. Symptom: High evaporator pressure | High chilled water temperature. | System overload. | Make sure that the vanes are wide open, without overloading the motor, until the load decreases. | 28 |
| 4. Symptom: No oil pressure when System Start button pressed | Low oil pressure displayed on Control Center; compressor does not start. | Oil pump is running in the wrong direction. | Check the rotation of oil pump (Electrical Connections). | 28 |
| 4. Symptom: No oil pressure when System Start button pressed | Low oil pressure displayed on Control Center; compressor does not start. | Oil pump is not running. | Troubleshoot electrical problem with oil pump VSD. | 28 |
| 5. Symptom: Unusually high oil pressure develops when oil pump runs | Unusually high oil pressure is displayed when the oil pressure display key is pressed when the oil pump is running. | High oil pressure. Transducer defective. | Replace the low or high oil pressure transducer. | 28 |
| 6. Symptom: Oil pump vibrates or is noisy | Oil pump vibrates or is extremely noisy with some oil pressure when pressing OIL PRESSURE display key. Note: When the oil pump is run without an oil supply, it vibrates and becomes extremely noisy. | Oil not reaching pump suction inlet in sufficient quantity. | Check the oil level. | 28 |
| 6. Symptom: Oil pump vibrates or is noisy | Oil pump vibrates or is extremely noisy with some oil pressure when pressing OIL PRESSURE display key. Note: When the oil pump is run without an oil supply, it vibrates and becomes extremely noisy. | Worn or failed oil pump. | Repair or replace the oil pump. | 28 |
| 7. Symptom: Reduced oil pump capacity | Oil pump pumping capacity. | Excessive end clearance pump. Other worn pump parts. | Inspect and replace all worn parts. | 28 |
| 7. Symptom: Reduced oil pump capacity | Oil pump pumping capacity. | Partially blocked oil supply inlet. | Check the oil inlet for a blockage. | 28 |
| 8. Symptom: Oil pressure gradually decreases (Noted by observation of daily log sheets) | When oil pump VSD frequency increases to >55 Hz to maintain target oil pressure. | Oil filter is dirty. | Change the oil filter. | 28 |
| 9. Symptom: Oil pressure system ceases to return an oil or refrigerant sample | Oil refrigerant return not functioning. | Filter-drier in oil return system dirty. | Replace the old filter-drier with a new filter-drier. | 28 |
| 9. Symptom: Oil pressure system ceases to return an oil or refrigerant sample | Oil refrigerant return not functioning. | Jet or orifice of oil return jet clogged. | Remove the jet, and inspect for dirt. Remove all dirt using solvent and replace. | 28 |
| 10. Symptom: Oil pump fails to deliver oil pressure | No oil pressure registers when pressing OIL PRESSURE display key when oil pump runs. | Faulty oil pressure transducer. Faulty wiring or connectors. | Replace the oil pressure transducer. | 29 |
| high oil temperature (HOT) | Condition on which the unit shuts down. | Incorrect lubrication brought about by restricted oil lines, passages, or dirty oil filters. | Change the oil filter element. Examine the oil filter element for the presence of aluminum particles. Aluminum gas seal rings can contact the impeller and account for some aluminum particles to accumulate in the oil filter, especially during the initial start up and first several months of operation. However, if aluminum particles continue to accumulate and the same conditions continue to stop the unit operation after a new filter is installed, notify the nearest Johnson Controls office to request the presence of a Johnson Controls Service Technician. | 35 |
| low oil pressure (OP) | Condition on which the unit shuts down. | Incorrect lubrication brought about by restricted oil lines, passages, or dirty oil filters. | Change the oil filter element. Examine the oil filter element for the presence of aluminum particles. Aluminum gas seal rings can contact the impeller and account for some aluminum particles to accumulate in the oil filter, especially during the initial start up and first several months of operation. However, if aluminum particles continue to accumulate and the same conditions continue to stop the unit operation after a new filter is installed, notify the nearest Johnson Controls office to request the presence of a Johnson Controls Service Technician. | 35 |
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