Tracer® ZN.520

to expose the damper stop screw on the control panel end. Relocate the stop screw to the appropriate position. Then loosen the stop screw wingnut and adjust the linkage.

Economizer Damper

With a valid outdoor air temperature (either hardwired or communi- cated), Tracer® ZN.520 uses the modulating economizer damper as the highest priority source of cooling. Economizer operation is only possible through the use of a modulating damper.

Economizing is possible during the occupied, occupied standby, unoccupied, and occupied bypass modes.

The controller initiates the economizer function if the outdoor air temperature is cold enough to be used as free cooling capacity. If the outdoor air temperature is less than the economizer enable setpoint (absolute dry bulb), the controller modulates the outdoor air damper (between the active minimum damper position and 100%) to control the amount of outdoor air cooling capacity. When the outdoor air temperature rises 5 F above the economizer enable point, the control- ler disables economizing and moves the outdoor air damper back to its predetermined minimum position based on the current occupancy mode or communicated minimum damper position.

Table 25. Relationship Between Outdoor Temperature Sensors

and Damper Position

Outdoor Air Temp.

Modulating Outdoor Air Damper

 

Occ. or

Occ. standby

Unocc.

 

Occ. bypass

 

 

None or invalid

Open to occ.

Open to occ.

Closed

 

min.pos.

standby

 

 

 

min. pos.

 

Failed

Open to occ.

Open to occ.

Closed

 

min.pos.

standby

 

 

 

min. pos.

 

Present and econ.

Economizing:

Economizing:

Open and

feasible

min pos.-100%

between occ.

econ. only

 

 

standby min.

when unit

 

 

pos.-100%

operating,

 

 

 

closed

 

 

 

otherwise

 

 

 

 

Present and econ.

Open to occ.

Open to occ.

Closed

not feasible

min. pos.

standby

 

 

 

min. pos.

 

UNT-IOM-6

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Trane LO manual Economizer Damper

LO specifications

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