Trane Tracer Unit Ventilator, ZN.520 manual Configuration, Configurable parameters, Cooling source

Configuration

Note: The Tracer Zn.520 unit controller only supports cascade control by controlling the discharge air temperature. Therefore, the controller requires both a space temperature input and a discharge air temperature input.

Table 9: Typical applications supported

Trane configures the Tracer® ZN.520 Unit Controller at the fac- tory per the selected unit configu- ration. The controller is applied classroom unit ventilator configu- rations that support modulating valves, 2-position valves, econo- mizer damper (modulating only), direct expansion (DX) cooling, 1-

and 2 -stage electric heat, face- and-bypass damper, baseboard heat, dehumidification, and ge- neric I/O. The controller also sup- ports HIGH and LOW fan speeds with exhaust fan output on 1- and 2-speed fan applications.

Configuration

2-pipe cooling only

2-pipe heating only

2-pipe changeover

4-pipe

4-pipe changeover

2-pipe face bypass heating only

2-pipe face bypass changeover

4-pipe face bypass DX cooling only

DX cooling, 2-pipe heating

DX cooling, electric heating

Electric heat only (1 or 2 stage)

1. Isolation valves are 2-position only.

Type of valve			Options
		Electric Heat	Economizer	Baseboard
Modulating	2 position	(1 or 2 stage)	Damper	Heat
ü	ü	ü	ü
ü	ü		ü	ü
ü	ü	ü	ü	ü
ü	ü		ü	ü
ü	ü		ü	ü
	ü1		ü	ü
	ü1		ü	ü
	ü1		ü	ü
NA	NA		ü
ü	ü		ü	ü
NA	NA	ü	ü	ü
NA	NA	ü	ü	ü

Configurable parameters

Rover service tool uses the unit type to determine and download many other aspects of the unit con- figuration, such as the default ana- log input configuration, the default binary input configuration, and the default binary output configura- tion.

Cooling source

qNone

qHydronic (main coil changeover)

qDedicated hydronic

qDX

Heating source

qNone

qHydronic

qDedicated hydronic

qSteam

qElectric heat

qHydronic (main coil changeover) + dedicated hydronic (auxiliary coil)

qHydronic (main coil changeover)

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