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Chapter 5 Sequence of operations

48 CNT-SVX07C-EN

Peer-to-peer communication

Tracer ZN521 zone 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:

• Smart reset

• Low-coil-temperature protection

• Condensate overflow

• Fan status

• Fan off delay

• Filter-maintenance timer

• Freeze avoidance

• Freeze protection (discharge air temperature low limit)

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