| Document type | Service Information Letter |
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| Document number | SI0393 |
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| Equipment | YMC2 Magnetic Bearing Centrifugal Chiller |
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| Brand | YORK |
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| File size | 0.2 MB |
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Fault codes in this document
2 of these messages are explained on a page of their own — cause, what to check, reset — written from this manual:
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 |
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. The short table of all YORK YMC2 messages: fault codes.
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.
