46
YORK INTERNATIONAL
TABLE 1 – CAUSES OF NORMAL AND SAFETY SYSTEM SHUTDOWNS IN ACCORDANCE WITH THE MICROCOMPUTER CONTROL, CENTER DISPLAY
| SHUTDOWN CAUSE |
| GOVERNING CONTROL FUNCTION |
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| CONTROL CENTER DISPLAY |
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| PROGRAMMED | PROBABLE CAUSE | ||||
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| OPERATING |
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| SETPOINTS | SYSTEM AFTER | AND SERVICE | ||
DAY OF | TIME OF | CAUSE OF |
| METHOD OF |
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| DESCRIPTION |
| BY OPERATOR | SHUTDOWN | REQUIRED | ||||||
WEEK | DAY | SHUTDOWN |
| RESTART | ON |
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| RISE |
| FALL |
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MON. | 10:00 AM | Oil Pressure |
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| High Oil Press. | 100 PSID (Dur- |
| 59 |
| Will start at 59 | This Shutdown is provided |
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| Transducer |
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| Transducer | ing first 7 min. of |
| PSID |
| PSID when compr. | to check on Oil Pressure |
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| Error |
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| Compr. Oper.) |
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| switch is placed to | Transducers for failure in |
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| 60 PSID (After |
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| STOP/RESET and | the high state. Replace |
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| first 7 min. of |
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| then START | Oil Press.Transducer in |
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| Compr. Oper.) |
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| oil sump or compressor |
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| Vane Motor |
| Autostart | Vane Motor |
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| Restart automatically | Vanes are set improperly, |
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| Switch Open |
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| Switch |
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| after Vane Motor arm | reset vane linkage check |
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| linkage is set pro- | vane positions using |
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| perly. Press STOP/ | the SERVICE key switch |
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| RESET and then | and proper keys on the |
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| START switch | MicroComputer Control |
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| Center |
MON. | 10:00 AM | Starter |
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| Motor Current > |
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| Press compressor | Check motor starter |
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| Malfunction |
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| 15% for 10 swc. |
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| STOP/RESET | operation. Motor current |
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| Detected |
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| with Control Cen- |
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| switch and then | value greater than 15% |
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| ter not calling for |
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| FLA |
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| motor to run |
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MON. | 10:00 AM | Program |
| Autostart | Micro Board |
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| Watchdog timer circuit |
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| Initiated |
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| has reset software pro- |
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| Reset |
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| gram – Chiller will |
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| automatically restart. |
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| Replace RTC |
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| Reprogram the Con- | Weak battery | |
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| IC chip |
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| trol Center Setponts | Replace |
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| Reprogram |
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| & proceed with | U16 |
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| Normal |
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MON. | 10:00 AM | Low Oil |
| Autostart | Oil Temp. | 71.0°F |
| 55°F |
| Press STOP/ | Oil Temp.Thermistor |
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| Temperature |
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| Thermistor |
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| RESET switch & | disconnected from |
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| (RT3) |
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| then START | Analog Input Board. |
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| switch | Reconnect or replace |
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| open sensor. |
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MON. | 10:00 AM | Faulty Dis- |
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| Discharge Temp. | 30.0°F |
| 29.9°F |
| Press STOP/ | Faulty Discharge Temp. |
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| charge Temp. |
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| Thermistor |
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| START switch & | Thermistor (RT2) or dis- |
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| Sensor |
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| (RT2) discon- |
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| then START | connected from Analog |
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| nected or faulty |
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| switch | Input Board. Connect or |
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| operating temp. |
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| replace open sensor. |
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| = 32°F |
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MON. | 100.00 AM | Low Line |
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| SSS Logic | See legend on wiring |
| Chiller will automa- | Low AC Line Voltage | ||
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| Voltage (SSS |
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| Board | diagram |
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| tically restart when |
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| Units only) |
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| all phases of line vol- |
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| tage increase to the |
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| minimum required |
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| starting level. |
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MON. | 10:00 AM | MTR Phase |
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| SSS Logic | See “Section 2” |
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| Press STOP/START | Motor Phase Current | |
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| Current |
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| Board |
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| switch then START | Unbalance |
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| unbalance |
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| switch |
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| (SSS Units |
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| only) |
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