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BCXC-SVX01B-EN 43
Controls Interface
Control Options
Blower coil air handlers are available without controls or with one of four different control options:
• Control interface
• Tracer™ ZN010
• Tracer ZN510
• Tracer ZN520
Units without controls have a junction box mounted on the drive side for motor power wire
terminations. The controller is easily accessible in the control box for service. Control option
descriptions follow below.
Control Interface
The control interface is for use with a field–supplied low voltage thermostat. It includes a control
box with a transformer, motor contactor, and disconnect switch. All hot leads to the motor are
disconnected at the contactor and disconnect switch to eliminate the risk of shock during service.
The end devices are mounted with the wires pulled and terminated inside the two-sided terminal
strip. All customer connections other than power are on the outside of the two-sided terminal strip.
Tracer Controllers
The Tracer™ family of controllers—ZN010, ZN510, and ZN520—offer the combined advantages of
simple and dependable operation with the latest Trane-designed controller. Standard control
features include options normally available on more elaborate control systems. All control options
are available factory-configured or can be field-configured using Rover™ service software. For
more detailed information, refer to Trane publication CNT-IOP-1, Installation, Operation, and
Programming Guide (for ZN010 or ZN510), or CNT-SVX04A-EN, Installation, Operation, and
Programming Guide (for ZN520).
Trac er Z N010
Tracer™ ZN010 is a stand-alone microprocessor controller.
Tracer ZN510 and ZN520
The Tracer™ ZN510 controller can be used as either a standalone or as part of a Trane Integrated
Comfort™ System (ICS).
In the stand-alone configuration, ZN510 or 520 receives operation commands from the zone sensor
and/or the auto changeover sensor (on auto changeover units). ZN520 also receives commands
from the discharge air sensor. The entering water temperature is read from the auto changeover
sensor and determines if the unit is capable of cooling or heating. The zone sensor module is
capable of transmitting the following information to the controller:
• Timed override on/cancel request
Figure 12. ZN510 control board Figure 13. ZN520 control board