CNT-SVX04A-EN
15
Configurations
The Tracer ZN.520 zone 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.
Trane configures the Tracer ZN.520 zone controller at the factory per unit
configuration. The controller is applied to fan coil, unit ventilator, and blower
coil configurations that support modulating valves, 2-position valves,
economizer damper(modulating only), direct expansion (DX) cooling, 1- and 2 -
stage electric, face and bypass damper, baseboard heat, dehumidification, and
generic binary output. The controller also supports 1-, 2-, and 3-speed fans with
exhaust fan output on 1- and 2-speed fan applications (medium fan speed
output). See Table 7 for actuator types supported for different configurations.
Table 7
Typical applications supported
Note
1
:
Isolation valves are 2-position only.
Configuration
Type of valve
Options
Modulating
2 position
Electric heat
(1 or 2 stage)
Economizer
damper
Baseboard
heat
2-pipe cooling only
ü
ü
ü
ü
2-pipe heating only
ü
ü
ü
ü
2-pipe changeover
ü
ü
ü
ü
ü
4-pipe
ü
ü
ü
ü
4-pipe changeover
ü
ü
ü
ü
2-pipe face bypass heating only
ü
1
ü
ü
2-pipe face bypass changeover
ü
1
ü
ü
4-pipe face bypass
ü
1
ü
ü
DX cooling only
NA
NA
ü
DX cooling, 2-pipe heating
ü
ü
ü
ü
DX cooling, electric heating
NA
NA
ü
ü
ü
Electric heat only (1 or 2 stage)
NA
NA
ü
ü
ü
