Trane Tracer ZN521, Инструкция по установке и эксплуатации

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CNT-SVX07D-EN 17
Input/output functions and wiring for typical applications
The generic temperature input can be used with any Trane 10 k
Ω
thermistor. The thermistor can be
placed in any location and has no effect on the operation of the controller. The controller will
generate a Generic Temperature Failure diagnostic if the input becomes invalid or goes out of
range.
Note: AI3 is not polarity sensitive; you can connect either terminal to either sensor lead.
AI4: Universal 4–20 mA
The AI4 analog input can be configured in one of the three ways shown in Table 5 .
If this input is not needed for an application, configure it as Not Used. This will disable the
generation of diagnostics.
Note: AI4 is polarity sensitive.
For the generic input configuration, a 4–20 mA sensor must be hard-wired to the AI4 terminal.
(Wiring is dependent on the specific application.) The sensor communicates a value of 0–100% to
the BAS. This configuration has no direct effect on Tracer ZN521 operation. If a valid value is
established and then is no longer present, the controller generates a Generic AIP Failure diagnostic.
For the CO
2
measurement configuration, a 4–20 mA sensor must be hard-wired to the AI4 terminal
as shown in Figure 5 . The sensor will transmit a 0–2000 ppm value to the BAS. This configuration
has no direct effect on Tracer ZN521 operation. If a valid value is established and then is no longer
present, the controller generates a CO
2
Sensor Failure diagnostic.
Figure 5. AI4 terminal wiring: CO
2
measurement
For the RH measurement configuration, either a hard-wired 4–20 mA zone humidity sensor (see
Figure 2 ) must provide a value to the controller or a BAS communicates a value to the controller.
The controller uses this value to support the dehumidification function. (For more information, see
“Dehumidification,” p. 40 .) If a valid hard-wired or communicated relative humidity value is
established and then is no longer present, the controller generates a Humidity Input Failure
diagnostic and disables the dehumidification function.
Table 5. AI4 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)
Tracer ZN521
24 Vac
CO
2
sensor
(Trane 5010 0828 shown)
24 Vac
GND
Signal