Document revision history
RTU Open v3 CARRIER CORPORATION ©2019
Installation and Start-up Guide All rights reserved
107
Important changes to this document are listed below. Minor changes such as typographical or formatting errors are not
listed.
Troubleshooting > To get the serial
number
As of 2019, serial numbers are laser-etched on the circuit
board
Appendix A > Service Configuration
Fixed error in System Fire / Smoke description
Corrected DCV Max Vent Damper Pos percent
Removed limit on Setpoint Adjustment Range
Appendix A > Service Configuration
VFD Speed Test - correction. Only Service Test muast be set to
Enable. Previously, it stated that both Service Test and Fan Test
What is the RTU Open controller?
J1 Input 5 (SMK) wire color corrected from gray to blue.
Wiring devices to the RTU Open's
Rnet port
Removed star configuration from the first paragraph.
What is the RTU Open controller?
In the drawing, corrected wire color for J1 Input-5 to blue from
dark gray
Added surge CAUTION to Protection specification.
To wire the Wireless Adapter for
wireless sensors
Added warning that the Wireless Adapter must be mounted on
the inside of the building
Removed SPT sensors from space temperature sensors.
Wiring inputs and outputs
Removed SPT sensor from Input wiring table, added TruVu™ ET
Display, and referred user to the device's Installation and Start-
up Guide.
Wiring devices to the RTU Open's
Rnet port
Combined overview and wiring on the zone sensors and
touchscreen devices. Added TruVu™ ET Display.
Reworded Rnet port specification and added power supplied by
Rnet port.
Reworded Protection specification and added first paragraph.
Added information that the unit must be shut down before
running Service Test and how to verify that.
Economizer
Added information on Fault Detection & Diagnostics
Corrected total number of supported wireless sensors to 5.
Added the load impedance when AO channels are used in a
voltage output type application.
Sequence of Operation - Cooling
Correction - OAT added to cooling algorithm re:economizer
Document revision history