Terminal Unit
Control (TUC)
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| Sequence 1 |
| Sequence 2 |
| Sequence 3 |
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| Sequence 1 |
| Sequence 2 |
| Sequence 3 |
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| 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 |
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| ϒ ϒ ϒ ϒ ϒ ϒ ϒ ϒ ϒ ϒ λ ϒ | |||||||||||
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| ϒ ϒ |
| ϒ | λ ϒ |
| ϒ | ϒ λ |
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| 5 | 6 |
| 7 | 5 | 6 |
| 7 | 5 | 6 |
| 7 |
Table 42. Operating Control Mode LED Sequences and Codes |
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Sequence 1 | Sequence 2 | Sequence 3 |
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1 2 3 4 | 1 2 3 4 | 1 2 | 3 | 4 | Code Control |
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| Definition |
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ϒ ϒ ϒ ϒ | ϒ ϒ ϒ ϒ | ϒ ϒ ϒ ϒ | 0 | Stop |
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| Diagnostic, user switch, | ||||||
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| Tracer® command or interlock | |||
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| has stopped the unit | |||
ϒ ϒ ϒ ϒ | ϒ ϒ ϒ ϒ | ϒ ϒ λ ϒ | 2 | Purge |
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| Incorrect entering water temp. | ||||||
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| The TUC cannot meet the | |||
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| demand. There is no other | |||
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| capacity available. | |||
ϒ ϒ ϒ ϒ | ϒ ϒ ϒ ϒ | ϒ λ ϒ ϒ | 4 | Tracer® |
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| The TUC received a Tracer® | ||||||
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| Override |
| verride. Follow Tracer® output | |||||
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| commands. |
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ϒ ϒ ϒ ϒ | ϒ ϒ ϒ ϒ | λ ϒ ϒ ϒ | 8 | Precool |
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| Unoccupied cooling with | ||||||
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| economizer, or water; | |||
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| occupied cooling feasibility | |||
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| check. |
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ϒ ϒ ϒ ϒ | ϒ ϒ ϒ ϒ | λ ϒ λ ϒ | 10 | Precool |
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| Unoccupied cooling with | ||||||
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| EWT economizer while purging | |||
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| for sampling cold water. | |||
ϒ ϒ ϒ ϒ | ϒ ϒ ϒ ϒ | λ λ ϒ ϒ | 12 | Precool |
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| Unoccupied cooling with 100% | ||||||
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| cool economizer with water or | |||
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| compressor augmentation. | |||
ϒ ϒ ϒ ϒ | ϒ ϒ ϒ ϒ | λ λ λ ϒ | 14 | Econo- |
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| Occupied cooling with econo- | ||||||
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| mizer |
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| mizer |
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ϒ ϒ ϒ ϒ | ϒ ϒ ϒ λ | ϒ ϒ ϒ ϒ | 16 | Econo- |
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| Occupied cooling with econo- | ||||||
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| mizer |
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| mizer while sampling for cold | ||||
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| EWT |
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| water. |
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| sampling |
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105 |
