Peer-to-peer communication, Unit protection strategies | Trane N512

Chapter 5 Sequence of operations

Peer-to-peer communication

Tracer ZN521 zone controllers have the ability to share data with other LonTalk-based controllers. Multiple controllers can be bound as peers, using the Rover service tool, to share:

•Setpoint

•Zone temperature

•Heating/cooling mode

•Fan status

•Unit capacity control

Shared data is communicated from one controller to any other controller that is bound to it as a peer. Applications having more than one unit serv- ing a single zone can benefit by using this feature; it allows multiple units to share a single zone temperature sensor and prevents multiple units from simultaneously heating and cooling.

Unit protection strategies

The following strategies are initiated when specific conditions exist in order to protect the unit or building from damage:

•Smart reset

•Low-coil-temperature protection

•Condensate overflow

•Fan status

•Fan off delay

•Filter-maintenance timer

•Freeze avoidance

•Freeze protection (discharge air temperature low limit)

48	CNT-SVX07C-EN

Image 58

Trane N512, Zone Controller, CNT-SVX07C-EN manual Peer-to-peer communication, Unit protection strategies

Contents

Installation and Operation Tracer ZN521 Zone Controller Page CNT-SVX07C-EN April CNT-SVX07C-EN Tracer ZN521 Zone Controller Installation and Operation CNT-SVX07C-EN Contents Sequence of operations Status indicators for operation and communication Troubleshooting Index Overview and specifications Product description Storage environment DimensionsClearances Plastic-cover model dimensions and clearances Agency listing/compliance Additional components Zone humidity sensor Tracer zone temperature sensor optionsDamper actuators CO2 sensor Overview and specifications Input/output terminal wiring AC-power wiring General wiring information Communication-link wiring and addressing General wiring information Location recommendations Operating environment requirements Mounting recommendations Mounting the Tracer ZN521 zone controller ControlValve Economizing Typical applications for the Tracer ZN521 zone controllerApplication SpeedfanMultiple Dehumidification HeatElectric BI2 Condensate overflow BI1 Low-coil-temperature detectionBinary inputs Binary inputs BI3 Occupancy or generic binary input BI4 Fan status GND Ground terminals ZN Zone temperatureAnalog inputs Analog inputs AI1 Entering water temperature FAN Fan mode inputSET Local setpoint AI2 Discharge air temperature AI3 Outdoor air temperature or generic temperature Configuration Measurement range AI4 configuration options and associated measurement rangesAI4 Universal 4-20 mA AI4 terminal wiring CO2 measurement Binary output functions Binary outputsGeneric binary output Binary output Functions Required controller inputs for proper operation Wiring requirements and optionsOverriding binary outputs Function Input source For more information See Two-pipe hydronic-cooling unit Two-pipe hydronic-heating unit Two-pipe hydronic heating/cooling unit with auto changeover Four-pipe hydronic heating/cooling unit Four-pipe heating/cooling unit with auto changeover Two-pipe heating unit with DX cooling Electric heat unit with DX cooling Electric heat unit Two-pipe heating unit with face-and-bypass damper Two-pipe heating/cooling unit with face-and-bypass damper Four-pipe heating/cooling unit with face-and-bypass damper Input/output functions and wiring for typical applications Power-up sequence Random start Occupied standby mode Occupied modeUnoccupied mode Occupancy modes Occupied bypass mode Timed override control Cascade zone control Zone temperature controlSimplified zone control Morning warm-up Heating or cooling modeDischarge air tempering Morning cool-down Entering water temperature sampling function Fan operation Exhaust control Exhaust control Modulating valve calibration Valve operationModulating valve operation Valve control options Isolation-valve operation Modulating outdoor/return air dampersTwo-position valve operation Two-pipe operation Modulating outdoor air damper position Ashrae Cycle 2 conformance Ashrae Cycle 1 conformanceEconomizing free cooling DX cooling operation Two-position control of a modulating outdoor air damperFace-and-bypass damper operation Face-and-bypass, isolation-valve operation Baseboard heat operation Electric heat operationDehumidification Peer-to-peer communication Unit protection strategies Fan off delay Smart resetLow-coil-temperature protection Condensate overflow Freeze protection discharge air temperature low limit Filter-maintenance timerFreeze avoidance Test button Tracer ZN521 zone controller circuit board Manual output test For non Output Close damper, air Outdoor Open damper, air Outdoor Step Result BOP1 BOP2 BOP3 BOP4 BOP5 BOP6 BOP7 BOP8 BOP9 Interpreting LEDs Service pin buttonRed LED Service indicator LED activity Explanation Green LED Status indicator Yellow LED Communications indicator Diagnostics Types of diagnostics Diagnostic Probable cause Consequences Type Table of diagnosticsDiagnostics Fan unaffected Valved unaffected Position Damper unaffected Status indicators for operation and communication Fan does not energize Probable cause Explanation Troubleshooting Valves remain closed Valves remain open DX or electric heat does not energize Outdoor air damper remains closed Outdoor air damper remains open Outdoor air damper remains open Troubleshooting Index Numerics Index Index Index Page Trane