CNT-SVX07D-EN
13
Input/output functions and wiring for typical
applications
This chapter provides information about the function of inputs and outputs and examples of wiring
for typical applications. Applications supported by the Tracer ZN521 zone controller are shown in
.
Figures
through
(pages 20 through 30) show typical wiring diagrams that include
all required and all optional components for typical applications.
Binary inputs
The Tracer ZN521 controller includes four binary inputs. Each binary input associates an input
signal of 0 Vac with open contacts and 24 Vac with closed contacts. You can use the Rover service
tool to configure each of the inputs as normally open or normally closed. If an application does not
warrant the use of a particular input, configure the input as Not Used. This will disable the
generation of diagnostics for this function.
gives the function of each binary input.
Table 2.
Typical applications for the Tracer ZN521 zone controller
Application
M
u
ltip
le fa
n
sp
eed
Dehu
mi
di
fic
a
tion
Auto minimum
da
mper ad
just
Fa
ce and by
pass da
mper
Va
lv
e c
o
ntro
l
Econ
omizi
n
g
Aux
ilia
ry
(b
ase
b
oa
rd
) hea
t
E
lec
tric hea
t
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
x
x
x
x
x
x
x
x
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
x
x
x
Table 3.
Binary inputs
Binary input
terminal label
Function
BI1
Low-coil-temperature detection
BI2
Condensate overflow
Summary of Contents for Tracer ZN521
Page 59: ......
