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| Installation and Operations Manual | |
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| Table 5. |
| System Troubleshooting Chart |
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| PROBLEM |
| POSSIBLE CAUSES |
| POSSIBLE CORRECTIVE STEPS |
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| Compressor | 1. | Main switch open. | 1. | Close switch. |
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| will not run |
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| 2. | Fuse blown. | 2. | Check electrical circuits and motor winding for shorts or grounds. |
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| Investigate for possible overloading. Replace fuse after fault is corrected. |
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| 3. | Thermal overloads tripped. | 3. | Overloads are automatically reset. Check unit closely when unit comes |
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| back on line. |
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| 4. | Defective contactor or coil. | 4. | Repair or replace. |
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| 5. | System shut down by safety devices. | 5. | Determine type and cause of shutdown and correct it before resetting |
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| safety switch. |
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| 6. | No cooling required. | 6. | None. Wait until calls for cooling. |
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| 7. | Motor electrical trouble. | 7. | Check motor for open windings, short circuit or burn out. |
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| 8. | Loose wiring. | 8. | Check all wire junctions. Tighten all terminal screws. |
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| Compressor | 1. | Flooding of refrigerant into crankcase. | 1. | Check setting of expansion valves. |
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| noisy or vibrating |
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| 2. | Worn compressor. | 2. | Replace. |
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| High | 1. | 1. | Remove the |
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| discharge |
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| 2. | Fan not running. | 2. | Check electrical circuit. Replace if motor fails. |
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| pressure | 3. | Dirty condenser coil. | 3. | Clean. |
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4.InformationService |
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| 4. | System overcharged with refrigerant. | 4. | Reclaim refrigerant and recharge proper amount. |
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Low | 1. | Lack of refrigerant. | 1. | Check for leaks. Repair and add charge (see refrigerant charge chart pg 2). |
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| Low discharge | 1. | Insufficient refrigerant in system. | 1. | Check for leaks. Repair and add charge. |
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| pressure | 2. | Low suction pressure. | 2. | See corrective steps for low suction pressure. |
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| High suction | 1. | Excessive load. | 1. | Reduce load or add additional equipment. |
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| pressure |
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| 2. | Expansion valve overfeeding. | 2. | Check remote bulb. Regulate superheat. |
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| suction |
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| 2. | Evaporator dirty or iced. | 2. | Clean. |
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| pressure | 3. | Expansion valve malfunctioning. | 3. | Check and reset for proper superheat. |
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| 4. | Condensing temperature too low. | 4. | Check ambient temperature 50°F to 100°F. |
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| Compressor | 1. | Operating beyond design conditions. | 1. | Add equipment so that conditions are within allowable limits. |
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| thermal protector |
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| 2. | Dirty condenser coil. | 2. | Clean coil. |
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| switch open |
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| 3. | Overcharged system. | 3. | Reduce charge (see refrigerant charge chart, pg 2). |
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| Fan(s) will | 1. | Main switch open. | 1. | Close switch. |
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| not operate | 2. | Blown fuses. | 2. | Replace fuses. Check for short circuits or overload conditions. |
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| 3. | Defective motor. | 3. | Replace motor. |
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| 4. | Defective defrost control. | 4. | Replace defective component. |
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| 5. | Unit in defrost cycle. | 5. | Wait for completion of cycle. |
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| 6. | Coil does not get cold enough to reset thermostat | 6. | Adjust fan delay setting of control. |
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| Room | 1. | Control cut out set too high. | 1. | Adjust control. |
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| temperature | 2. | Superheat too high. | 2. | Adjust thermal expansion valve. |
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| too high |
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| 3. | System low on refrigerant. | 3. | Add refrigerant. See refrigerant charge chart pg. 2. |
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| 4. | Coil | 4. | Manually defrost coil. Check defrost controls for malfunction. |
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| Ice accumulating | 1. | Defrost duration is too long. | 1. | Adjust defrost termination temperature on control. | |||
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| on ceiling around | 2. | Fan delay not delaying fans after defrost period. | 2. | Adjust fan delay setting or replace bad sensor. |
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| evaporator and/or |
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| 3. | Defective defrost control or sensor. | 3. | Replace defective control or sensor. |
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| on fan guards' | 4. | Too many defrosts. | 4. | Adjust number of defrosts. |
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| venturi or blades |
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| Coil not clearing | 1. | Coil temperature not getting above freezing | 1. | Check heater operation. |
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| of frost during |
| point during defrost. |
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| defrost cycle. | 2. | Not enough defrost cycles per day. | 2. | Adjust control for more defrost cycles. |
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| 3. | Defrost cycle too short. | 3. | Adjust defrost control, defrost duration setting. |
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| 4. | Defective defrost control or sensor. | 4. | Replace defective component. |
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| Ice accumulating | 1. | Defective heater. | 1. | Replace heater. |
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| in drain pan | 2. | Unit not installed properly (out of level) | 2. | Check and adjust if necessary. |
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| 3. | Drain line plugged. | 3. | Clean drain line. |
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| 4. | Defective control. | 4. | Replace defective component. |
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