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CNT-SVX07C-EN 13
Chapter 4
Input/output functions and
wiring for typical applications
This chapter provides information about the function of inputs and out-
puts and examples of wiring for typical applications. Applications sup-
ported by the Tracer ZN521 zone controller are shown in Table 2.
Figures 7 through 17 (pages 23 through 33) show typical wiring diagrams
that include all required and all optional components for typical applica-
tions.
Table 2. Typical applications for the Tracer ZN521 zone controller
Application
Multiple fan speed
Dehumidification
Auto minimum damper adjust
Face and bypass damper
Valve control
Economizing
Auxiliary (baseboard) heat
Electric heat
2-pipe hydronic cooling only x x x x x x
2-pipe hydronic heating only x x x x x x
2-pipe changeover xxxxxxxx
2-pipe steam only x x x x x x
4-pipe hydronic heating and cooling x x x x x x x
4-pipe changeover x x x x x x x
4-pipe steam/chilled water x x x x x
Electric heat only (single- and two-stage) x x ×
DX/hydronic heating x x x x x
DX/steam heating x x x x x
DX cooling only xxx