| Document type | Service Information Letter |
|---|---|
| Document number | SI0393 |
| Equipment | YMC2 Magnetic Bearing Centrifugal Chiller |
| Brand | YORK |
| File size | 0.2 MB |
Fault codes in this document
MOTOR COOLING
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| MOTOR – LOW WINDING TEMPERATURE | New low winding temperature fault added to prevent the chiller from running. | If resistor R261 on the 2911 VSD logic board fails open, all of the motor winding temperatures register at their minimum value (32°F); motor cooling control then closes the valve, allowing the windings and rotor to overheat. | Fault prevents the chiller from running; this message is displayed should the condition exist. | 1 |
RAPTYR VSD FAULTS
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| VSD - HIGH INTERNAL AMBIENT TEMPERATURE | Changed at the request of Field and PTS; previously this fault condition required a manual reset. Now a Cycling Fault, but if 3 occur within a 90 minute period it becomes a Safety Fault which will require user intervention and a manual clearing of the Fault Button. | 2 | ||
| VSD - LINE VOLTAGE PHASE ROTATION | Changed at the request of Field and PTS; previously this fault condition required a manual reset. Now changed to a Cycling Fault. | 2 | ||
| VSD - PHASE LOCKED LOOP | Changed at the request of Field and PTS; previously this fault condition required a manual reset. Now changed to a Cycling Fault. | 2 |
LOSS OF SUBCOOLER LIQUID SEAL WARNING
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| LOSS OF SUBCOOLER LIQUID SEAL WARNING | Program changed to only check for Loss of Subcooler Liquid Seal when the chiller is loaded above 40%FLA; there is no threat to the subcooler tubes when the chiller is loaded below 40% FLA, and previous versions of the software caused nuisance alarms at light loads. | 2 |
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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.