Terminal Unit

Control (TUC)

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

 

ϒ ϒ ϒ ϒ

ϒ ϒ ϒ λ

ϒ ϒ λ ϒ

18

Cool

Occupied cooling with the

 

 

 

 

 

water coil

ϒ ϒ ϒ ϒ

ϒ ϒ ϒ λ

ϒ λ ϒ ϒ

20

Cool

Occupied cooling with water

 

 

 

 

econo-

and 100% economizer

 

 

 

 

mize

 

ϒ ϒ ϒ ϒ

ϒ ϒ ϒ λ

ϒ λ λ ϒ

22

Preheat

Unoccupied heating with hot

 

 

 

 

 

water (main or auxiliary), or

 

 

 

 

 

electric heat.

ϒ ϒ ϒ ϒ

ϒ ϒ ϒ λ

λ ϒ ϒ ϒ

24

Preheat

Two-pipe only, unoccupied

 

 

 

 

EWT

heating with electric heat

 

 

 

 

sampling

while sampling for hot water.

ϒ ϒ ϒ ϒ

ϒ ϒ ϒ λ

λ ϒ λ ϒ

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.

ϒ ϒ ϒ ϒ

ϒ ϒ ϒ λ

λ λ ϒ ϒ

28

Heat

Occupied heating with

 

 

 

 

 

hot water (main or auxiliary

 

 

 

 

 

coil)

ϒ ϒ ϒ ϒ

ϒ ϒ ϒ λ

λ λ λ ϒ

30

Electric

Occupied heating with

 

 

 

 

heat

electric heat

ϒ ϒ ϒ ϒ

ϒ ϒ λ ϒ

ϒ ϒ ϒ ϒ

32

Heat

Electric heat available:

 

 

 

 

electric

occupied heating with 100%

 

 

 

 

heat

hot water (main or auxiliary)

ϒ ϒ ϒ ϒ

ϒ ϒ λ ϒ

ϒ ϒ λ ϒ

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.

106

UNT-IOM-6

Page 106
Image 106
Trane LO manual Operating Control Mode LED Sequences and Codes Definition

LO specifications

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