Analog inputs for heat pump applications
CNT-SVX12C-EN 51
Analog inputs for heat pump
applications
The Tracer ZN517 controller has five analog inputs. Table 19 describes
the function of each input for heat pump applications. Each function is
explained in the succeeding paragraphs. For an explanation of the diag-
nostics generated by each analog input, see “Table of diagnostics” on
page 79. For more information about how the controller operates, see
Chapter 8, “Sequence of operations for the heat pump configuration”.
AI1: Universal 4–20 mA
The AI1 analog input can be configured in one of the three ways shown in
Table 20.
If this input is not needed for an application, configure it as Not Used.
This disables the generation of diagnostics.
For the generic input configuration, a 4–20 mA sensor must be hard-
wired to the AI1 terminal. (Wiring is dependent on the specific applica-
Table 19. Analog inputs for heat pump applications
Analog input
terminal label
Function
AI1 Universal analog input
AI2 Outdoor air temperature
DAT Discharge air temperature
ZN Zone temperature (required)
SET Temperature setpoint
Note:
Use a GND terminal as the common ground for all zone sensor
analog inputs. See Figure 14 on page 47.
Table 20. AI1 configuration options and associated measurement
ranges
Configuration Measurement range
Generic 4–20 mA input 0–100%
(4 mA=0%; 20 mA=100%)
CO
2
measurement 0–2000 ppm
(4 mA=0 ppm; 20 mA=2000 ppm)
Relative humidity (RH) measurement 0–100%
(4 mA=0% RH; 20 mA=100% RH)
Note:
AI1 is polarity sensitive.
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