Terminal Unit
Control (TUC)
Table
Sequence 1 | Sequence 2 | Sequence 3 |
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1 2 3 4 | 1 2 3 4 | 1 2 3 4 | Code | Control | Definition |
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| Mode |
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ϒ ϒ ϒ ϒ | ϒ ϒ ϒ λ | ϒ ϒ λ ϒ | 18 | Cool | Occupied cooling with the |
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| water coil |
ϒ ϒ ϒ ϒ | ϒ ϒ ϒ λ | ϒ λ ϒ ϒ | 20 | Cool | Occupied cooling with water |
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| econo- | and 100% economizer |
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| mize |
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ϒ ϒ ϒ ϒ | ϒ ϒ ϒ λ | ϒ λ λ ϒ | 22 | Preheat | Unoccupied heating with hot |
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| water (main or auxiliary), or |
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| electric heat. |
ϒ ϒ ϒ ϒ | ϒ ϒ ϒ λ | λ ϒ ϒ ϒ | 24 | Preheat | |
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| EWT | heating with electric heat |
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| sampling | while sampling for hot water. |
ϒ ϒ ϒ ϒ | ϒ ϒ ϒ λ | λ ϒ λ ϒ | 26 | Preheat | Unoccupied heating with |
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| electric | 100% hot water (main or |
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| heat | auxiliary) or with electric |
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| heat augmentation. Or, |
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| unoccupied heating with |
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| 100% main coil hot water |
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| with auxiliary coil hot water |
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| augmentation. |
ϒ ϒ ϒ ϒ | ϒ ϒ ϒ λ | λ λ ϒ ϒ | 28 | Heat | Occupied heating with |
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| hot water (main or auxiliary |
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| coil) |
ϒ ϒ ϒ ϒ | ϒ ϒ ϒ λ | λ λ λ ϒ | 30 | Electric | Occupied heating with |
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| heat | electric heat |
ϒ ϒ ϒ ϒ | ϒ ϒ λ ϒ | ϒ ϒ ϒ ϒ | 32 | Heat | Electric heat available: |
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| electric | occupied heating with 100% |
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| heat | hot water (main or auxiliary) |
ϒ ϒ ϒ ϒ | ϒ ϒ λ ϒ | ϒ ϒ λ ϒ | 34 | Electric | |
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| heat | heating with electric heat |
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| EWT | while purging for hot water. |
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| sampling |
Electric heat not available: Occupied heating with 100% main coil hot water with auxiliary coil hot water augmentation.
106 |
