Tracer® ZN.520

Zone Sensor

Space Temperature Measurement

The Tracer® ZN.520 controller accepts the following zone sensor module inputs:

•Space temperature measurement (10kW thermistor)

•Local setpoint (either internal or external on the zone sensor module)

•Fan switch

•Timed override (On) and Cancel timed override

•Communication jack

Trane zone sensors use a 10kW thermistor to measure the space temperature. Typically, zone sensors are wall-mounted in the room and include a space temperature thermistor. As an option, the zone sensor can be unit-mounted with a separate space temperature thermistor located in the unit’s return air stream. If both a hardwired and communicated space temperature value exist, the controller ignores the hardwired space temperature input and uses the commu- nicated value.

External Setpoint Adjustment

Zone sensors with an external setpoint adjustment (1kW) provide the

 

Tracer® ZN.520 controller with a local setpoint (50 to 85 F or 10 to

 

29.4 C). The external setpoint is exposed on the zone sensor’s front

 

cover.

 

When the hardwired setpoint adjustment is used to determine the

 

setpoints, all unit setpoints are calculated based on the hardwired

 

setpoint value, the configured setpoints, and the active mode of the

 

controller. The hardwired setpoint is used with the controller’s occu-

 

pancy mode (occupied, occupied standby, or unoccupied), the

 

heating or cooling mode, the temperature deadband values, and the

 

heating and cooling setpoints (high and low limits) to determine the

 

controller’s active setpoint.

When a building automation system or other controller communicates a setpoint to the controller, the controller ignores the hardwired setpoint input and uses the communicated value. The exception is the unoccupied mode, when the controller always uses the stored default unoccupied setpoints. After the controller completes all setpoint calculations, based on the requested setpoint, the occu- pancy mode, the heating and cooling mode, and other factors, the calculated setpoint is validated against the following setpoint limits:

•Heating setpoint high limit

•Heating setpoint low limit

•Cooling setpoint high limit

•Cooling setpoint low limit

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Trane LO manual Zone Sensor, Space Temperature Measurement, External Setpoint Adjustment
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LO specifications

Trane LO is a cutting-edge solution in the HVAC sector, designed with advanced engineering and smart technologies to meet diverse climate control needs. Renowned for its reliability and efficiency, Trane LO offers a wide array of features that set it apart in the market.

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The Trane LO also emphasizes durability. Constructed with high-quality materials, including weather-resistant finishes, these units are built to withstand various environmental conditions, ensuring they maintain peak performance over the years.

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