| Document type | Service Information Letter |
|---|---|
| Document number | SI0271 |
| Equipment | YK Centrifugal Chiller |
| Brand | YORK |
| File size | 0.6 MB |
Fault codes in this document
Warning – DC Bus Active
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Warning – VSD – DC Bus Active | Non-annunciating warning, displayed in yellow text, alerting the user that the MVVSD, VSD or Harmonic Filter DC bus voltage is above 50 VDC, posing a potential safety issue if the cabinet is opened. | MVVSD, VSD or Harmonic Filter DC bus voltage above 50 VDC while the chiller is in the Stopped State. Only applies when the Motor Drive Type is VSD 50Hz, VSD 60Hz, or MVVSD (VSD 50 and 60Hz includes Vyper and Raptyr designed drives). | Active only when the chiller is in the Stopped State; automatically cleared in any other state. The Warning Relay is not activated for this warning. | 2 |
Subcooler Tube Failure
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Warning – Liquid Level Setpoint not Achieved | Automatic Reset Warning. | Set when all of the following are true for 10 continuous minutes: • Chiller is Running • Run Time > 30 minutes • Refrigerant Level > (Refrigerant Level setpoint +15%) OR Refrigerant Level < (Refrigerant Level setpoint -15%) |
Automatic reset — released when: • Chiller is not Running • (Refrigerant Level setpoint -15%) < Refrigerant Level < (Refrigerant Level setpoint +15%) When this warning occurs, it shall be added to the security log. |
3 |
| Warning - Loss of Subcooler Liquid Seal | Warning indicating loss of the subcooler liquid seal. | The chiller has been running for 30 minutes or more and the Drop Leg Temperature is less than the Return Condenser Liquid Temperature continuously for two minutes. | This warning requires a manual reset when the above conditions are no longer true. The message "Loss of Subcooler Liquid Seal Warning Reset" is added to the Security Log when the warning is reset. | 3 |
Faults
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Isolation Valves - Not Closed | Cycling fault (Isolation Valves option). | Set when the following conditions exist for 3 continuous seconds: Isolation Valves Close Output is energized > 40 seconds, but Isolation Valves Closed Feedback is not energized. | Released when Isolation Valves Closed input is energized. | 5 |
| Isolation Valves - Not Opened | Safety fault (Isolation Valves option). | Set when the following conditions exist for 3 continuous seconds: Isolation Valves Open Output is energized > 40 seconds, but Isolation Valves Opened Feedback is not energized. | Released when the Compressor is in stopped state and the Compressor switch is placed into the stop position. | 5 |
Seal Lubrication Timer and Warning
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Warning – Seal Lubrication In Progress | Non-annunciating warning (changed to be a non-annunciating warning in this software version). | When Standby Lube is enabled, seal lubrication is performed by running the Oil Pump for two minutes, once every twenty-four hours since the Oil Pump was last run for at least two minutes. | 9 |
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.