FORM
PROBLEM |
| CAUSE | SOLUTION |
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“MP / HPCO” FAULT | 1. Compressor internal motor | 1. Verify refrigerant charge is |
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| protector (MP) open. | not low. Verify superheat |
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| setting of ° 10 - 15° F (5.6° - |
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| 8.3°C). Verify correct com- |
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| pressor rotation. Verify |
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| compressor is not over |
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| loaded. |
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| 2. | External overload tripped. | 2. Determine cause and reset. |
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| 3. | HPCO switch open | 3. See “High Press. Disch.” |
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| Fault |
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| 4. | Defective HPCO switch | 4. Replace HPCO switch |
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| 5. | Defective CR relay | 5. Replace relay |
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COMPRESSOR(S) WON’T | 1. Demand not great enough. | 1. No problem. Consult |
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| 3 | ||||
START |
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| “Installation” Manual to aid |
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| in understanding compres- |
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| sor operation and capacity |
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| control. |
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| 2. | Defective water temperature | 2. Compare the display with a |
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| sensor. | thermometer. Should be |
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| within +/- 2 degrees. Refer |
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| to Service section for RWT/ |
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| LWT temp./voltage table. |
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| 3. | Contactor/Overload failure | 3. Replace defective part. |
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| 4. | Compressor failure | 4. Diagnose cause of failure |
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| and replace. |
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LACK OF COOLING EFFECT | 1. Fouled evaporator surface. | 1. Contact the local YORK |
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| Low suction pressure will | service representative. |
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| be observed. |
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| 2. | Improper flow through the | 2. Reduce flow to within chiller |
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| evaporator. | design specs. See Limita- |
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| tions in Installation section. |
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| 3. | Low refrigerant charge. | 3. Check subcooling and add |
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| Low suction pressure will | charge as needed. |
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| be observed. |
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YORK INTERNATIONAL | 107 |
