Binary outputs
CNT-SVX04A-EN
25
Generic binary output/Baseboard heat output
Terminals TB4-1 and TB4-2 can be configured for either a generic binary output,
or to control baseboard heat.
When configured for a
generic binary output
, the controller does not use the
generic binary output as a part of normal control. This output is only controlled
by a Trane Tracer Summit™ system (when present) that can issue commands,
via communications to the Tracer ZN.520 zone controller, to turn the generic
output on and off.
For all configurations, all other binary outputs can only be used for their defined
function and
cannot
be used for any other function, such as generic
applications. Additionally, if a binary output is defined as Not Used, it
cannot
be applied generically and must remain unused.
When configured for
baseboard heat output
, the controller turns on the
baseboard heat at 2.2°F below the active heating setpoint and turns it off at
0.8°F below the active heating setpoint. The range for activating the baseboard
heat cannot be adjusted; however, the heating setpoint can be changed using a
Rover™ service tool or a Tracer Summit system.
Baseboard heating is most effectively used when the discharge air temperature
control high limit is adjusted to a moderately warm temperature. The unit heat
can maintain the space on light load days, and the baseboard heat will activate
on heavier load days to maintain zone comfort.
Output overrides
The Tracer ZN.520 zone controller includes a manual output test function. This
function can be initiated either by depressing the blue Test push button on the
controller or via communications using the manual test variable. Use this
feature to manually exercise the outputs in a defined sequence. For more
information about the manual output test function, see “Manual output test” on
page 88.
The Tracer ZN.520 zone controller contains a water valve override function that
can be used for water balancing. A communicating device, such as the Rover
service tool, controls this function. The water valve outputs are driven open or
closed. For more information about the water balancing function, see “Water
valve override” on page 71.
Analog outputs
The Tracer ZN.520 zone controller does
not
include analog output capability.
