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Terminal Unit
Control (TUC)
106 UNT-IOM-6
Table 42Continued. Operating Control Mode LED Sequences and Codes
Sequence 1 Sequence 2 Sequence 3
1 2 3 4 1 2 3 4 1 2 3 4 Code Control Definition
Mode
¡¡¡ ¡ ¡¡¡l ¡¡l¡ 18 Cool Occupied cooling with the
water coil
¡¡¡ ¡ ¡¡¡l ¡l¡¡ 20 Cool Occupied cooling with water
econo- and 100% economizer
mize
¡¡¡ ¡ ¡¡¡l ¡ll¡ 22 Preheat Unoccupied heating with hot
water (main or auxiliary), or
electric heat.
¡¡¡ ¡ ¡¡¡l l¡¡¡ 24 Preheat Two-pipe only, unoccupied
EWT heating with electric heat
sampling while sampling for hot water.
¡¡¡ ¡ ¡¡¡l l¡l¡ 26 Preheat Unoccupied heating with
electric 100% hot water (main or
heat auxiliary) or with electric
heat augmentation. Or,
unoccupied heating with
100% main coil hot water
with auxiliary coil hot water
augmentation.
¡¡¡ ¡ ¡¡¡l l l¡¡ 28 Heat Occupied heating with
hot water (main or auxiliary
coil)
¡¡¡¡ ¡¡¡l lll¡ 30 Electric Occupied heating with
heat electric heat
¡¡¡ ¡ ¡¡l¡ ¡¡¡¡ 32 Heat Electric heat available:
electric occupied heating with 100%
heat hot water (main or auxiliary)
¡¡¡ ¡ ¡¡l¡ ¡¡l¡ 34 Electric Two-pipe only, occupied
heat heating with electric heat
EWT while purging for hot water.
sampling
Electric heat not available: Occupied heating with 100% main coil hot water with auxiliary coil hot water
augmentation.