Two-pipe heating unit with DX cooling | Trane CNT-SVX07C-EN, N512

Chapter 4 Input/output functions and wiring for typical applications

Figure 12. Two-pipe heating unit with DX cooling

Fan status (closed=on)*

Occupancy (open=occupied)*

Condensate overflow (closed=normal)*

Low-coil-temperature detection (closed=normal)*

24 Vac H N

24 V†

Fan, high speed

24 V†

Exhaust (or fan, medium speed)

24 V†

Fan, low speed

24 V†

DX cooling

		24 V†
		Heating valve
			24 V†
			Outdoor air damper actuator
	Open Close	Open Close	24 V†
	Open Close	Open Close	Generic/baseboard heat
			Generic/baseboard heat

GND 24V 24V 24V BI1	BI2	BI3	BI4	1 2 3 4 5 6 7 8 9 10 STATUS
				LED
AC POWER	BINARY INPUTS			BINARY OUTPUTS

ZONE SENSOR	ANALOG INPUTS		COMM5
SERVICE				COMM5
PIN LED ZN GND SET FAN GND AI1	AI2	AI3 +20 AI4 GND A	B A B	LED

On

Cancel

1
2
3
4
5 LonTalk	Entering water
6	temperature

Discharge air temperature

	}	LonTalk
	AI4 input: See	in
	Figures 5 and 6	in
	Figures 5 and 6
	on page 20 for
	wiring options	out
		out

Outdoor air or generic temperature

* All binary inputs are configurable.

†Connect 24 V to an AC POWER (24V) terminal.

28	CNT-SVX07C-EN

Image 38

Trane CNT-SVX07C-EN, Zone Controller, N512 manual Two-pipe heating unit with DX cooling

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 Clearances DimensionsStorage environment 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 SET Local setpoint FAN Fan mode inputAI1 Entering water temperature AI2 Discharge air temperature AI3 Outdoor air temperature or generic temperature AI4 Universal 4-20 mA AI4 configuration options and associated measurement rangesConfiguration Measurement range 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 Simplified zone control Zone temperature controlCascade 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 Economizing free cooling Ashrae Cycle 1 conformanceAshrae Cycle 2 conformance DX cooling operation Two-position control of a modulating outdoor air damperFace-and-bypass damper operation Face-and-bypass, isolation-valve operation Dehumidification Electric heat operationBaseboard heat operation Peer-to-peer communication Unit protection strategies Fan off delay Smart resetLow-coil-temperature protection Condensate overflow Freeze avoidance Filter-maintenance timerFreeze protection discharge air temperature low limit 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