Installation & Service Manual | N5D, N5DH, N5DL, N5DSC |
SERVICE INSTRUCTIONS
Troubleshooting Self-Contained Units
WARNING
Never work on electrically powered equipment while it is energized! Electrical shock could cause personal injury and/or death.
TROUBLE | COMMON CAUSE | REMEDY | |
1. | Unit will not run | Blown fuse | Replace fuse. |
|
| Low voltage | Check outlet with voltmeter. Voltage |
|
|
| should be 115V or 220V (±10%). |
|
| Inoperative motor or | Check connections. |
|
| temperature control |
|
2. | Refrigerated section | Shelves overloaded; | Make sure items do not block the |
| is too warm | blocked air flow | air flow. |
|
| Thermostat set incorrectly | Check setting. |
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| Pressure control set | Check setting. |
|
| incorrectly |
|
|
| Case fans not operating | Check terminal block connections. |
3. | Refrigerated section | Thermostat set incorrectly | Check setting. |
| too cold |
|
|
|
| Pressure control set | Check setting. |
|
| incorrectly |
|
4. | Unit runs all the time | Inadequate air circulation | Relocate cabinet or remove obstruc- |
|
|
| tion. Check installation requirements. |
|
| Room temperature | Ventilate room appropriately. |
|
| too warm |
|
|
| Thermostat set incorrectly | Reset thermostat. |
|
| Refrigerant charge low | Have unit serviced by a qualified |
|
|
| service technician. |
5. | Noisy operation | Loose baffles | Tighten or brace baffles. |
|
| Tubing contacting cabinet | Move tubing. |
|
| or other tubing |
|
|
| Cabinet not level | Level cabinet. |
6. | Frost or ice on | Defrost clock doesn’t work | Check electrical conections. Have |
| evaporator coil |
| unit serviced by a qualified service |
|
|
| technician. |
7. | Water dripping from | Condensate drain clogged | Clear drain. |
| case drain |
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|
|
| Dissipator not functioning | Check electrical supply. Check |
|
|
| float assembly. |
January, 2001 | Page 15 |
