Binary outputs for heat pump applications
CNT-SVX12C-EN 49
Binary outputs for heat pump
applications
This configuration supports heat pump applications that have the follow-
ing components:
• Economizer
• Supply fan
• One or two compressors
• Reversing valve
• Auxiliary heat
• Exhaust fan
The Tracer ZN517 controller has eight binary outputs. Each binary out-
put is a relay with a rating of 12 VA. Table 17 describes the function of
each output for heat pump applications.
Binary output 5
Use the Rover service tool to configure binary output 5 (5NO/5COM/5NC)
in one of the following ways. It is the only output that can be configured
as a generic binary output.
• Not used.
• Exhaust fan: Will energize when the economizer outside air damper
position is greater than the user-defined control point.
• Occupancy: Will energize when the Tracer ZN517 is in the occupied
mode.
• Generic: Can be monitored only by a BAS and has no direct effect on
Tracer ZN517 operation.
Overriding binary outputs
Use the manual output test to manually control the outputs in a defined
sequence. For more information about the manual output test, see “Man-
ual output test” on page 74.
Table 17. Binary outputs for 2-heat/2-cool applications
Binary output terminal label Function
OPN Economizer, drive open
CLS Economizer, drive closed
G Supply fan
1 (Y1) Compressor 1
2 (Y2) Compressor 2
3 (O) Reversing valve
4 (W1) Auxiliary heat
5NO/5COM/5NC (binary output 5) Exhaust fan/generic/occupancy
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