Trane CAB-PRC001-EN manual Controls Features, Control Features, ZN.520 Additional Features

Controls Features

Control Features

The following control functions are standard features on units with Tracer ZN.010, ZN.510, or ZN.520.

Occupied/Unoccupied Operation The occupancy input utilizes a binary switch (i.e. motion sensor, timeclock, etc.) that allows the zone sensor to utilize it’s unoccupied internal setpoints.

Random Start

This feature randomly staggers multiple unit start-up to reduce electrical demand spikes.

Warm-up

The two-position fresh air damper option closes during the occupied mode when the space temperature is three degrees or more below the heating setpoint tem- perature. The damper remains closed during warm-up until the space tempera- ture is within two degrees of the heating setpoint temperature.

Manual Output Test Function

This feature is an invaluable tool for troubleshooting a unit. By simply pressing the controller’s test button, service personnel can manually exercise outputs in a pre-defined sequence.

Peer to Peer Communication (ZN.510 and ZN.520)

Peer to peer communication allows multiple units in one space to share the same zone sensor and provide simulta- neous heating. The ZN.510 or ZN.520 controller can share information between units on the same communication link using a twisted pair wire in the field. Unit

configuration must be modified with Rover service tool.

ZN.520 Additional Features

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.

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.

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