| Document type | Service Information Letter |
|---|---|
| Document number | SI0212 |
| Equipment | YK Centrifugal Chiller |
| Brand | YORK |
| File size | 0.3 MB |
Fault codes in this document
VSD High Instantaneous Current Fault
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| VSD-High Phase X Instantaneous Current (VSD) VSD-High Instaneous Current (MVVSD) |
High instantaneous current fault on the variable speed drive; reported per phase (“Phase X”) on VSD units and as a general fault on MVVSD units. | Shutdown behaviour changed in software V21: previously a Cycling shutdown. In this version, the fault becomes a Safety shutdown if the same fault (on any phase) occurs 3 times in 90 minutes. The first 2 shutdowns within the 90-minute window remain Cycling shutdowns; if a third occurs within 90 minutes of the first, the third is a Safety shutdown that requires a manual restart. The 90-minute window applies to a High Instantaneous Fault on any phase: three faults on any phase in 90 minutes, or one fault on each of the three phases, results in the 3rd fault becoming a Safety shutdown. | 3 |
Oil Sump Enhancements
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Oil – Low Temperature Differential | Condition that prevents a chiller start. | Arises after the chiller has been running at low load conditions for extended periods, when the oil temperature gets too low. | Avoided in software V21 on P, Q and H9 compressor chillers: while the compressor is running, the Oil Return Solenoid (1SOL) is now cycled closed (de-energizing K12 relay) when the Oil Sump Temperature < OIL RETURN MIN Setpoint (programmable 80.0ºF to 110.0ºF, default 95.0ºF), and opened (energizing K12 relay) when Oil Sump Temperature > OIL RETURN MIN + 7°F, so the condition no longer prevents a chiller start. During coastdown and startup, solenoid operation is unchanged from standard logic (remains closed). | 4 |
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