Terminal Unit
Control (TUC)
106 UNT-IOM-6
Table 42—Continued. 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
18 Cool Occupied cooling with the
water coil
20 Cool Occupied cooling with water
econo- and 100% economizer
mize
22 Preheat Unoccupied heating with hot
water (main or auxiliary), or
electric heat.
24 Preheat Two-pipe only, unoccupied
EWT heating with electric heat
sampling while sampling for hot water.
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.
28 Heat Occupied heating with
hot water (main or auxiliary
coil)
30 Electric Occupied heating with
heat electric heat
32 Heat Electric heat available:
electric occupied heating with 100%
heat hot water (main or auxiliary)
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.
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