Catalogue

48 UV-PRC004-EN
Controls
3. When in the unoccupied mode the Tracer ZN520 has an adjustable freeze avoidance setpoint.
If the outside air temperature is below the setpoint the unit will open the valves to allow water
to flow through the coils.
Interoperability. Interoperability allows the owner freedom to select multiple vendors, and
multiple products. With this advantage, the owner can choose the best products, the best
application, and the best service from a variety of suppliers to meet their evolving building control
needs in a cost effective manner.
Generic Binary Input/Output. The three generic binary inputs/outputs are not part of the
normal control, but are actually controlled through he Tracer Summit system (when present) to
issue commands to the Tracer ZN520 control to turn the generic inputs/outputs of add-on
equipment (such as baseboard heating, exhaust fans, occupancy sensor, lighting, etc.) on and off.
This binary port is not affected when other binary diagnostics interrupt unit operation.
Tracer ZN520
UV-PRC004-EN.book Page 48 Monday, February 4, 2013 11:01 AM