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Chapter 2 General wiring information
8 CNT-SVX07C-EN
CAUTION
Complete input/output wiring before applying power to the Tracer
ZN521 zone controller. Failure to do so may cause damage to the con-
troller or power transformer due to inadvertent connections to power
circuits.
IMPORTANT
Do not share 24 Vac between controllers.
All wiring must comply with National Electrical Code and local codes.
The ac-power connections are in the top left corner of the Tracer ZN521
zone controller (see Figure 3).
Figure 3. Connecting ac-power wires to the controller
The Tracer ZN521 may be powered by an existing transformer integral to
the controlled equipment, provided the transformer has adequate power
available and proper grounding is observed. If you are providing a new
transformer for power, use a UL-listed Class 2 power transformer supply-
ing a nominal 24 Vac (19–30 Vac). The transformer must be sized to pro-
vide adequate power to both the Tracer ZN521 zone controller (14 VA)
and its associated output devices, including relays and actuators, to a
maximum of 12 VA per output utilized.
24 Vac
transformer
H
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