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UNT-PRC001-EN36
Features
ZN.520 Additional Features
Automatic Ventilation Reset
To ensure proper ventilation rates, the
controller is configured with two fresh air
damper minimum position setpoints for
occupied operation. As the fan speed
changes to low or high, the damper
modulates to maintain the correct
ventilation rate for the space. The
damper position does not change when
the fan speed changes to medium.
Fan Status
The ZN.520 controller monitors the fan
output status to determine if the fan is
operating.
Filter Maintenance Status
The controller has an adjustable timer
that indicates through Summit or Rover
when filter maintenance is necessary.
Filter maintenance status is based on
cumulative fan run hours.
Dehumidification
When the fan-coil unit is equipped with a
reheat coil and humidity sensor, the
controller will keep humidity levels within
an acceptable range. This feature helps
reduce the risk of microbial growth and
damage to building interiors.
Water Valve Override
Using Summit or Rover, the water valve
override function drives all water valves
in every unit fully open simultaneously.
This helps reduce the time required for
waterside balancing.
Cascade Control
The controller maintains discharge air
temperature using a cascade control
algorithm. The discharge air temperature
is based on the difference between the
space temperature and setpoint. Unit
capacity modulates to achieve the
discharge air temperature.
Interoperability
The ZN.520 controller can be used with a
Tracer Summit system or on other
control systems that suport LonTalk and
the SCC profile. For more information on
specific inputs and outputs, see the
Installation, Owner, and Maintenance
Manual, UNT-IOM-6
.