Peer-to-peer communication
CNT-SVX12C-EN 61
wire floating point) outputs be used to control the damper actuator. The
minimum damper position will increase as CO
2
levels rise above
500 ppm. The function executes with a 3-minute loop frequency to allow
time for the sensor to respond.
To enable this function, use the Rover service tool to configure the Tracer
ZN517 as follows:
• Configure AI1 as a carbon dioxide sensor
• Enter a minimum CO
2
level (Control Point)
(factory default: 500 ppm).
• Enter a maximum CO
2
threshold (Threshold)
(factory default: 1500 ppm).
When the CO
2
level reaches the threshold, the minimum position is
100% open.
Peer-to-peer communication
Tracer ZN517 unitary controllers have the ability to share data with
other LonTalk-based controllers. Multiple controllers can be bound as
peers, using the Rover service tool, to share:
• Setpoint
• Zone temperature
• Heating/cooling mode
• Fan status
• Unit capacity control
Shared data is communicated from one controller to any other controller
that is bound to it as a peer. Applications having more than one unit serv-
ing a single zone can benefit by using this feature; it allows multiple units
to share a single zone temperature sensor and prevents multiple units
from simultaneously heating and cooling.
Unit protection strategies
The following strategies are initiated when specific conditions exist in
order to protect the unit or building from damage:
• Filter-maintenance timer
• Fan off delay
• Fan status
Filter-maintenance timer
The filter-maintenance timer tracks the amount of time (in hours) that
the fan is enabled. The Maintenance Required Timer Setpoint (Maint Req
Time Setpoint), configured with the Rover service tool, is used to set the
amount of time until maintenance (typically, a filter change) is needed. If
the setpoint is configured to zero, the filter-maintenance timer is dis-
abled.
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