Configurable Parameters - Trane Tracer ZN.520 Installation Owner Diagnostics

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
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.

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
q None
q Hydronic (main coil
changeover)
q Dedicated hydronic
q DX
32
Configuration
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-
Type of valve
Modulating 2 position
ü
ü
ü
ü
ü
NA
ü
NA
NA
Heating source
q None
q Hydronic
q Dedicated hydronic
q Steam
q Electric heat
q Hydronic (main coil
changeover) + dedicated
hydronic (auxiliary coil)
q Hydronic (main coil
changeover)
and 2 -stage electric heat, face-
®
and-bypass damper, baseboard
heat, dehumidification, and ge-
neric I/O. The controller also sup-
ports
HIG H
with exhaust fan output on 1- and
2-speed fan applications.
Electric Heat Economizer
(1 or 2 stage)
ü ü
ü
ü ü
ü
ü
ü
1
ü
1
ü
1
NA
ü
ü
NA
ü
NA
and fan speeds
LO W
Options
Baseboard
Damper Heat
ü
ü ü
ü ü
ü ü
ü ü
ü ü
ü ü
ü ü
ü
ü ü
ü ü
ü ü
UV-SVP01A-EN