Chapter 6 Applications for the 1 heat/1 cool configuration
34 CNT-SVX06B-EN
Binary inputs for 1 heat/1 cool
applications
The Tracer ZN511 controller includes five binary inputs, three of which
are available for use in 1 heat/1 cool applications. Each binary input asso-
ciates an input signal of 0 Vac with open contacts and 24 Vac with closed
contacts. Table 8 gives the function of each binary input for 1 heat/1 cool
applications. Each function is explained in the succeeding paragraphs.
For an explanation of the diagnostics generated by each binary input, see
“Diagnostics” on page 62. For more information about how the controller
operates, see Chapter 7, “Sequence of operations for the 1 heat/1 cool con-
figuration”.
BI1: Low-temperature detection
The function of low-temperature detection is to protect the coil from freez-
ing. If BI1 is wired to a binary low-temperature detection device (freeze-
protection switch), the Tracer ZN511 will detect a low-temperature condi-
tion and generate a Low Temp Detection diagnostic. If the application
does not warrant the use of BI1, configure the input as Not Used. This
will disable the generation of diagnostics for this function.
BI2: Condensate overflow
The function of condensate overflow is to prevent the condensate drain
pan from overflowing and causing water damage to the building. If BI2 is
wired to a condensate overflow switch and the level of condensate reaches
the trip point, the ZN511 will detect the condition and generate a Con-
densate Overflow diagnostic. If the application does not warrant the use
of BI2, configure the input as Not Used. This will disable the generation
of diagnostics for this function.
Table 8. Binary inputs for 1 heat/1 cool applications
Binary input
terminal label
Function
BI1 Low-temperature detection
BI2 Condensate overflow
BI3 Occupancy or generic binary input
BI4 and V4 Not used
BI5 and V5 Not used
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