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