IX. TROUBLESHOOTING GUIDE (cont’d)
| PROBLEM |
| POSSIBLE CAUSE/REMEDY |
6. Condensing unit operates for prolonged | 1. | Shortage Of Refrigerant - Fix Leak, Add Charge | |
| periods or continuously. | 2. | Control Contacts Stock or Frozen Closed - Clean Contacts or |
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| Replace Control |
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| 3. | Excessive Heat Load Placed Into Cabinet - Allow Unit |
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| Sufficient Time For Removal Of Latent Heat |
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| 4. | Prolonged or Too Frequent Door Openings - Plan or |
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| Organize Schedule To Correct Condition |
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| 5. | Evaporator Coil Iced - Defrost |
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| 6. | Restriction In Refrigeration System - Determine Locations & |
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| Remove |
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| 7. | Dirty Condenser - Clean Condenser |
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| 8. | Filter Dirty - Clean or Replace |
7. | Start capacitor open or shorted or blown. | 1. | Relay Contacts Not Opening Properly - Clean Contacts or |
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| Replace Relay If Necessary |
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| 2. | Prolonged Operation On Start Cycle Due To: |
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| a) Low Voltage To Unit - Determine Reason & Correct |
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| b) Improper Relay - Replace |
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| c) Starting Load Too High - Correct By Using Pump Down |
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| Arrangement If Necessary |
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| 3. | Excessive Short Cycling - Determine Reason For Short |
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| Cycling (see #5 above) And Correct |
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| 4. | Improper Capacitor - Determine Correct Size |
8. | Run capacitor open, shorted or blown. | 1. | Improper Capacitor - Determine Correct Size & Replace |
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| 2. | Excessively High Line Voltage (110% of rated max) - |
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| Determine Reason & Correct |
9. | Relay defective or burned out. | 1. | Incorrect Relay - Check & Replace |
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| 2. | Incorrect Mounting Angle - Remount Relay In Correct |
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| Position |
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| 3. | Line Voltage Too High or Too Low - Determine Reason & |
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| Correct |
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| 4. | Excessive Short Cycling - Determine Reason (see #5 above) |
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| & Correct |
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| 5. | Relay Being Influenced By Loose Vibrating Mounting - |
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| Remount Rigidly |
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| 6. | Incorrect Run Capacitor - Replace With Proper Capacitor |
10. Product zone temperature too high. | 1. | Control Setting Too High - Reset Control | |
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| 2. | Inadequate Air Circulation - Rearrange Product Load To |
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| Improve Air Circulation |
11. Suction line frosted or sweating. | 1. | Overcharge of refrigerant - Correct Charge | |
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| 2. | Evaporator Fan Not Running - Determine Reason & Correct |
12. Liquid line frosted or sweating. | 1. | Restriction In Dehydrator or Strainer - Replace Part | |
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| 2. | Liquid |
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| Fully |
13. Noisy condensing unit. | 1. | Loose Parts or Mounting - Find & Tighten | |
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| 2. | Tubing Rattle - Reform To Free Of Contact |
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| 3. | Bent Fan Blade Causing Vibration - Replace Blade |
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| 4. | Fan Motor Bearing Worn - Replace Motor |
