44
YORK INTERNATIONAL
TABLE 1 – CAUSES OF NORMAL AND SAFETY SYSTEM SHUTDOWNS IN ACCORDANCE WITH THE MICROCOMPUTER CONTROL, CENTER DISPLAY
| SHUTDOWN CAUSE |
| GOVERNING CONTROL FUNCTION |
|
|
| ||||
| CONTROL CENTER DISPLAY |
|
|
|
| |||||
|
|
|
|
| PROGRAMMED | PROBABLE CAUSE | ||||
|
|
|
|
|
|
|
| |||
|
|
|
|
|
| OPERATING | ||||
|
|
|
|
|
| SETPOINTS | SYSTEM AFTER | AND SERVICE | ||
DAY OF | TIME OF | CAUSE OF |
| METHOD OF |
| POINT | ||||
| DESCRIPTION | BY OPERATOR | SHUTDOWN | REQUIRED | ||||||
WEEK | DAY | SHUTDOWN |
| RESTART | ON | ON | ||||
|
|
|
|
| ||||||
|
|
|
|
|
| RISE | FALL |
|
|
|
MON. | 10:00 AM | Low Water |
| Autostart | Low Water | Chilled | 4°F below | 4°F below chilled | Automatic Restart | System load is less |
|
| Temp. |
|
| (LWT) | water | chiller | water setpoint | when water reaches | than minimum |
|
|
|
|
|
| setpoint | water | (If set to 40°F | setpoint; if system | capacity |
|
|
|
|
|
|
| setpoint | would be 36°F) | is running and set- |
|
|
|
|
|
|
|
|
| (36°F minimum | point is increased |
|
|
|
|
|
|
|
|
|
| 4°F, system will |
|
|
|
|
|
|
|
|
|
| continue to run, as |
|
|
|
|
|
|
|
|
|
| LWT cutout shifts |
|
|
|
|
|
|
|
|
|
| to a fixed 36°F for |
|
|
|
|
|
|
|
|
|
| 10 minutes. |
|
|
|
|
|
|
|
|
|
|
|
|
MON. | 10:00 AM | Flow Switch |
| Autostart | Flow Switch |
|
|
| Automatic Restart | Lack of water flow. |
|
|
|
|
|
|
|
|
| when water flow is | Check operation of |
|
|
|
|
|
|
|
|
| Restored to close | chilled water pump |
|
|
|
|
|
|
|
|
| flow switch. |
|
|
|
|
|
|
|
|
|
|
|
|
MON. | 10:00 AM | System |
| Autostart | A remote com- |
|
|
| Automatic Restart | |
|
| Cycling |
|
| mand (computer |
|
|
| upon remote | the Remote/Local |
|
|
|
|
| relay contact or |
|
|
| command. | cycling input of the |
|
|
|
|
| manual switch) |
|
|
|
| Digital input board |
|
|
|
|
|
|
|
|
|
|
|
MON. | 10:00 AM |
| Autostart | (Optional) Lead- |
|
|
| Automatic Restart | ||
|
|
|
|
| Lag Sequence |
|
|
| upon remote | the |
|
|
|
|
| Control |
|
|
| command. | input of the Digital |
|
|
|
|
|
|
|
|
|
| input board |
|
|
|
|
|
|
|
|
|
|
|
MON. | 10:00 AM | Internal |
| Autostart | Internal Clock |
|
| Daily Schedule | Will automatically | Pressing Compressor |
|
| Clock |
|
|
|
|
| Programmed to | restart when pro- | Start Switch over- |
|
|
|
|
|
|
|
| Shutdown Unit | grammed schedule | rides the program |
|
|
|
|
|
|
|
|
| permits |
|
|
|
|
|
|
|
|
|
|
|
|
MON. | 10:00 AM | AC under- |
| Autostart | <15% FLA for |
|
|
|
| Cycling shutdown oc- |
|
| voltage |
|
| 25 continuous |
|
|
|
| curs when motor cur- |
|
|
|
|
| seconds |
|
|
|
| rent is >15% FLA for |
|
|
|
|
|
|
|
|
|
| 25 seconds during |
|
|
|
|
|
|
|
|
|
| chiller operation |
MON. | 10:00 AM | Power Fault |
| Autostart |
|
|
| Will start automatic- | Motor Controller con- | |
|
|
|
|
| Module or |
|
|
| tically following | tacts opening and |
|
|
|
|
| Solid State |
|
|
| coastdown | closing in less than 3 |
|
|
|
|
| Starter |
|
|
|
| seconds due to a power |
|
|
|
|
|
|
|
|
|
| fault condition |
|
| Remote Stop |
|
| Energy manage- |
|
|
| Start up by start | Remote Stop Contact |
|
|
|
|
| ment System |
|
|
| signal from remote | Closure |
|
|
|
|
|
|
|
|
| start switch |
|
|
|
|
|
|
|
|
|
|
|
|
MON. |
|
|
|
|
| Will not start | Will restart when | Min.Time between | ||
|
| 20 Min. Left |
|
| timer |
|
| until 30 Min. | time left = 00 Min. | successive compres- |
|
|
|
|
|
|
|
| timer is timed |
| sor starts is 30 min. |
|
|
|
|
|
|
|
|
|
|
|
TROUBLESHOOTING | SECTION 6 |
