| Document type | Service Information Letter |
|---|---|
| Document number | SI0609 |
| Equipment | YK Centrifugal Chiller |
| Brand | YORK |
| File size | 0.6 MB |
Fault codes in this document
Display messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| WARNING - OIL - HIGH SUPPLY TEMPERATURE | Auto reset warning (oil cooling control) | When oil cooling control is enabled, displayed after the unit has been running for 30 minutes and the oil supply temperature is higher than the oil supply temperature setpoint + 10.0°F for 1 continuous minute. | Auto reset — the warning resets when the oil supply temperature is lower than the oil supply temperature + 5.0°F. | 5 |
| WARNING - OIL - LOW SUPPLY TEMPERATURE | Auto reset warning (oil cooling control) | When oil cooling control is enabled, displayed after the unit has been running for 30 minutes and the oil supply temperature is lower than the oil supply temperature setpoint − 10.0°F for 1 continuous minute. | Auto reset — the warning is reset when the oil supply temperature is higher than the oil supply temperature − 5.0°F. | 5 |
| OIL - HIGH SUPPLY TEMPERATURE | Safety fault (oil cooling control) | When oil cooling control is enabled, displayed after the unit has been running for 30 minutes and the oil supply temperature is higher than the oil supply temperature setpoint + 15.0°F for 1 continuous minute. | Manual clear — the fault is released when the oil supply temperature is lower than the oil supply temperature + 15.0°F and the Clear Fault key is pressed. | 5 |
| OIL - LOW SUPPLY TEMPERATURE | Safety fault (oil cooling control) | When oil cooling control is enabled, displayed after the unit has been running for 30 minutes and the oil supply temperature is lower than the oil supply temperature setpoint − 15.0°F for 1 continuous minute. | Manual clear — the fault is released when the oil supply temperature is higher than the oil supply temperature − 15.0°F and the Clear Fault key is pressed. | 5 |
| MBC - LOW BEARING J TEMPERATURE | MBC generated cycling fault | Occurs when the J Bearing temperature is lower than −22°F (−30°C). This would indicate an open temperature circuit. | Auto reset — the fault automatically clears when the temperature rises above −22°F (−30°C). | 5 |
| MBC - LOW BEARING H1 TEMPERATURE | MBC generated cycling fault | Occurs when the H1 Bearing temperature is lower than −22°F (−30°C). This would indicate an open temperature circuit. | Auto reset — the fault automatically clears when the temperature rises above −22°F (−30°C). | 5 |
| MBC - LOW BEARING H2 TEMPERATURE | MBC generated cycling fault | Occurs when the H2 Bearing temperature is lower than −22°F (−30°C). This would indicate an open temperature circuit. | Auto reset — the fault automatically clears when the temperature rises above −22°F (−30°C). | 5 |
| MBC - LOW BEARING K TEMPERATURE | MBC generated cycling fault | Occurs when the K Bearing temperature is lower than −22°F (−30°C). This would indicate an open temperature circuit. | Auto reset — the fault automatically clears when the temperature rises above −22°F (−30°C). | 5 |
| MBC - LOW HEATSINK TEMPERATURE | MBC generated cycling fault | Occurs when the MBC Heatsink temperature is lower than −22°F (−30°C). This would indicate an open temperature circuit. | Auto reset — the fault automatically clears when the temperature rises above −22°F (−30°C). | 5 |
| WARNING - COMPRESSOR - LOW DISCHARGE SUPERHEAT | Manual reset warning | Displayed when the compressor discharge superheat is less than 2.0°F for 5 minutes. It is bypassed for the first 30 minutes of run time. | Manual reset — the warning can be reset when the discharge superheat temperature is greater than 2.0°F and the Warning Reset key is pressed. | 6 |
| WARNING - CONDENSER - LIQUID LEVEL STABILITY | Manual reset warning (YK chillers only) | Displayed after the condenser liquid level minimum and maximum value has been greater than the Liquid Level Stability Threshold for 30 consecutive minutes (three consecutive 10 minute monitoring windows, starting after the chiller has been running for 30 minutes). | Manual reset — the warning can be reset when the difference is less than the threshold for 10 minutes and the Warning Reset key is pressed. | 6 |
Miscellaneous
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| CONDENSER – HIGH PRESSURE | Safety fault (YZ chillers, Condenser Temperature Range set to Extended) | Triggered when the condenser pressure is equal to or higher than 53.7 psia. | Released when the condenser pressure is less than 43.7 psia. | 4 |
| Condenser High Pressure Warning | Warning (YZ chillers, Condenser Temperature Range set to Extended) | Enhanced programmable high limit and default value is now 51.7 psia. | 4 |
YK Low Discharge Superheat
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Low Discharge Superheat | Safety fault (changed behaviour in this software version) | Set when the discharge superheat is less than 1.0°F for 5 minutes; bypassed for the first 30 minutes of run time. | 4 |
Every row above cites the page of this document it came from, and each one is re-read against that page by an automatic check before publication.
Manufacturer document, published here as reference material for equipment we supply. The original lives at docs.johnsoncontrols.com. The rights holder may ask us to take it down — we will.