3. Rail Cooling
Problem | Possible Cause |
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| Remedy | |||
[1] | Rail temperature too | a) Warm Food | 1. | Warm food recently | 1. | ||
| high. |
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| placed in rail area. |
| for unit to return to setpoint |
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| temperature. |
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| b) Rail Pans/Dividers | 1. | Missing, not in place. | 1. | Replace. Pans must cover | |
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| entire rail for proper cooling. |
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| c) Outside Heat Source | 1. | Too close to unit. | 1. | Separate unit from heat | |
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| source. |
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| d) Rail Switch | 1. | "OFF" position. | 1. | Move to "NORMAL" or | |
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| "LOW" position. |
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| 2. Bad contacts. | 2. Check for continuity and | ||
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| replace. |
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| e) Rail Thermistor | 1. | Defective. | 1. | See "II.E. Thermistor | |
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| Check." |
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| f) | Setpoint and/or | 1. | Incorrect. | 1. | Correct setting(s). |
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|
| Temperature |
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| See "II.D.4.c) Temperature |
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| Correction Factor |
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| Setpoint" or |
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| "II.D.4.f) Temperature |
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| Correction Factor" for |
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| defaults. |
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| g) Air Filter or Condenser | 1. | Clogged, dirty. | 1. | Clean. | |
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| h) Rail Liquid Line Valve | 1. | Does not open. | 1. | Check and replace. | |
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| i) | Service Valve(s) | 1. | Partially or completely | 1. | Confirm service valve is |
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| closed. |
| open. |
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| j) | Refrigerant | 1. | Leak. | 1. | Recover, repair leak, |
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| replace drier, evacuate, and |
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| recharge. |
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| k) Expansion Valve | 1. | Operating erratically. | 1. | Check and replace. | |
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| l) | Compressor | 1. | Defective. | 1. | See "1.[3] Compressor will |
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| not start or stops operating." |
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| m)Control Board | 1. | Defective. | 1. | Replace. | |
[2] | Rail temperature too | a) Setpoint and/or | 1. | Incorrect. | 1. | Correct setting(s). | |
| low. |
| Temperature |
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|
| See "II.D.4.c) Temperature |
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| Correction Factor |
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| Setpoint" or |
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| "II.D.4.f)Temperature |
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| Correction Factor" for |
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| defaults. |
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| b) Frozen Food | 1. | Frozen food recently | 1. | Allow time for unit to return | |
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| placed in refrigerator. |
| to setpoint temperature. |
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| c) Rail Thermistor | 1. | Defective. | 1. | Check and replace. | |
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| d) Rail Liquid Line Valve | 1. | Does not close. | 1. | Check and replace. | |
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| e) Rail Fan Motor | 1. | Defective. | 1. | Check and replace. | |
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| f) | Control Board | 1. | Defective. | 1. | Replace. |
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