Four-pipe heating/cooling unit with auto changeover | Trane N512

Wiring requirements and options

Figure 11. Four-pipe heating/cooling unit with auto changeover

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†

Heating/cooling changeover valve

24 V†

Auxiliary heating valve

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

Entering water

LonTalk 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.

CNT-SVX07C-EN

27

Image 37

Trane N512, Zone Controller, CNT-SVX07C-EN manual Four-pipe heating/cooling unit with auto changeover

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 Product description Overview and specifications Storage environment DimensionsClearances Plastic-cover model dimensions and clearances Additional components Agency listing/compliance Damper actuators Tracer zone temperature sensor optionsZone humidity sensor CO2 sensor Overview and specifications AC-power wiring Input/output terminal wiring General wiring information Communication-link wiring and addressing General wiring information Operating environment requirements Location recommendations Mounting the Tracer ZN521 zone controller Mounting recommendations Application SpeedfanMultiple Dehumidification Typical applications for the Tracer ZN521 zone controllerControlValve Economizing HeatElectric Binary inputs BI1 Low-coil-temperature detectionBI2 Condensate overflow Binary inputs BI4 Fan status BI3 Occupancy or generic binary input Analog inputs ZN Zone temperatureGND Ground terminals Analog inputs AI1 Entering water temperature FAN Fan mode inputSET Local setpoint AI3 Outdoor air temperature or generic temperature AI2 Discharge air temperature Configuration Measurement range AI4 configuration options and associated measurement rangesAI4 Universal 4-20 mA AI4 terminal wiring CO2 measurement Generic binary output Binary outputsBinary output functions Binary output Functions Overriding binary outputs Wiring requirements and optionsRequired controller inputs for proper operation 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 Random start Power-up sequence Unoccupied mode Occupied modeOccupied standby mode Occupancy modes Timed override control Occupied bypass mode Cascade zone control Zone temperature controlSimplified zone control Discharge air tempering Heating or cooling modeMorning warm-up Morning cool-down Fan operation Entering water temperature sampling function Exhaust control Exhaust control Modulating valve operation Valve operationModulating valve calibration Valve control options Two-position valve operation Modulating outdoor/return air dampersIsolation-valve operation Two-pipe operation Modulating outdoor air damper position Ashrae Cycle 2 conformance Ashrae Cycle 1 conformanceEconomizing free cooling Face-and-bypass damper operation Two-position control of a modulating outdoor air damperDX cooling operation Face-and-bypass, isolation-valve operation Baseboard heat operation Electric heat operationDehumidification Unit protection strategies Peer-to-peer communication Low-coil-temperature protection Smart resetFan off delay Condensate overflow Freeze protection discharge air temperature low limit Filter-maintenance timerFreeze avoidance Tracer ZN521 zone controller circuit board Test button Manual output test Output For non Close damper, air Outdoor Open damper, air Outdoor BOP1 BOP2 BOP3 BOP4 BOP5 BOP6 BOP7 BOP8 BOP9 Step Result Red LED Service indicator Service pin buttonInterpreting LEDs LED activity Explanation Yellow LED Communications indicator Green LED Status indicator Types of diagnostics Diagnostics Diagnostics Table of diagnosticsDiagnostic Probable cause Consequences Type Fan unaffected Position Valved unaffected Damper unaffected Status indicators for operation and communication Probable cause Explanation Fan does not energize Valves remain closed Troubleshooting DX or electric heat does not energize Valves remain open Outdoor air damper remains open Outdoor air damper remains closed Outdoor air damper remains open Troubleshooting Numerics Index Index Index Index Page Trane