Chapter 3 Applications for the 2-heat/2-cool configuration
10 CNT-SVX12C-EN
Wiring requirements and options
Table 3 shows required controller inputs for minimal proper operation of
all 2-heat/2-cool applications.
Table 4 shows optional controller inputs and outputs for specific
applications.
Figure 4 on page 11 shows a wiring diagram for the Tracer ZN517 that
includes all required and all optional components for 2-heat/2-cool appli-
cations.
Table 3. Required controller inputs for all 2-heat/2-cool applications
Function Input source
For more information,
see:
24 Vac power Terminals: GND, 24 V “AC power wiring” on
page 85
Zone temperature Terminals: ZN, GND
or communicated
“ZN: Zone tempera-
ture” on page 18
Table 4. Optional controller inputs and outputs for specific applications
Application Input/Output
For more information,
see:
Economizing Input:
DAT (discharge air temperature)
“Economizing” on
page 23
Input:
AI2 (outdoor air temperature)
Outputs:
24 V (24 Vac common)
OPN (binary output)
CLS (binary output)
Discharge air
tempering*
Input: DAT “Discharge air tem-
pering” on page 24
Demand control
ventilation*
Input:
AI1 (CO
2
sensor)
“Demand control
ventilation” on
page 24
Cascade control Input: DAT “Cascade zone con-
trol” on page 20
* In order to use this function, the economizing function must be enabled.
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