Installing the RTU Open
RTU Open v3 CARRIER CORPORATION ©2019
Installation and Start-up Guide All rights reserved
15
These RTU Open inputs accept the following signal types:
1, 2 4-20 mA The input resistance on the positive (+) terminal is 250 Ohms.
The Aux Power Out terminal is capable of supplying 24 Vdc to a
4-20 mA transducer, but the total current demanded must not
exceed 40 mA. If the voltage measured from the Aux Power Out
terminal to Gnd is less than 18 Vdc, you need to use an external
power supply.
3, 5, 8, 9 Binary (24 Vac) 24 Vac voltage, resulting in a 25 mA maximum sense current
when the contacts are closed
6, 7, 10 Thermistor 10 kOhm at 77°F (25°C)
11 100k Potentiometer Typically used for 33CZT56SPT Setpoint Offset Potentiometer
The RTU Open has 8 binary outputs. You can connect each output to a maximum of 24 Vac/Vdc. Each output is a
dry contact rated at 3 A, 24 V maximum, and is normally open.
To size output wiring, consider the following:
• Total loop distance from the power supply to the controller, and then to the controlled device
Include the total distance of actual wire. For 2-conductor wires, this is twice the cable length.
• Acceptable voltage drop in the wire from the controller to the controlled device
• Resistance (Ohms) of the chosen wire gauge
• Maximum current (Amps) the controlled device requires to operate
The RTU Open has 2 analog outputs that support voltage or current devices.
2-10 Vdc or 4-20 mA (Configure on jumper J3)
0-10 Vdc or 2-10 Vdc
The controlled output device must share the same ground as the controller. When used as a 4-20 mA
output, the load must have an input impedance of 500 Ohms or less. If the output is used as a voltage type
output, then the load impedance must be 10K ohms or greater.
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