Carrier RTU Open v3 Integration Guide

Contents
Introduction .................................................................................................................................................................. 1
What is the RTU Open controller? ...................................................................................................................... 1
Safety considerations & handling warning ....................................................................................................... 3
Wiring inputs and outputs ........................................................................................................................................... 4
Communications wiring .............................................................................................................................................. 6
Protocol overview .................................................................................................................................................. 6
BACnet MS/TP ...................................................................................................................................................... 7
To set up the RTU Open for BACnet MS/TP ......................................................................................... 7
Troubleshooting BACnet MS/TP ........................................................................................................... 8
Modbus ................................................................................................................................................................... 9
To set up the RTU Open for Modbus .................................................................................................... 9
Troubleshooting Modbus .................................................................................................................... 11
Johnson N2 ......................................................................................................................................................... 12
To set up the RTU Open for N2 ........................................................................................................... 12
Troubleshooting N2 ............................................................................................................................. 13
LonWorks ............................................................................................................................................................ 14
To set up the RTU Open for the LonWorks Option Card (Part #LON-OC) ......................................... 14
Commissioning the controller for LonWorks communication ........................................................... 15
Troubleshooting LonWorks ................................................................................................................. 16
Start-up ....................................................................................................................................................................... 17
Sequence of Operation ............................................................................................................................................. 18
Occupancy ........................................................................................................................................................... 18
Supply fan ........................................................................................................................................................... 19
Cooling ................................................................................................................................................................. 19
Economizer ......................................................................................................................................................... 20
Power Exhaust .................................................................................................................................................... 21
Pre-Occupancy Purge ........................................................................................................................................ 21
Unoccupied Free Cooling .................................................................................................................................. 21
Optimal Start ...................................................................................................................................................... 22
Enthalpy control ................................................................................................................................................. 23
Indoor Air CO2 .................................................................................................................................................... 23
Heating ................................................................................................................................................................ 24
Heat Pump operation ........................................................................................................................................ 24
Dehumidification ............................................................................................................................................... 25
Demand Limiting ............................................................................................................................................... 25
Door switch ......................................................................................................................................................... 25
Remote Occupancy ........................................................................................................................................... 26
Fire Shutdown .................................................................................................................................................... 26
Compressor Safety ............................................................................................................................................ 26
Fan Status ........................................................................................................................................................... 26
Filter status ......................................................................................................................................................... 27
Alarms ................................................................................................................................................................. 27
Linkage ................................................................................................................................................................ 29
Air source mode determination....................................................................................................................... 31
Troubleshooting ......................................................................................................................................................... 32
LED's .................................................................................................................................................................... 32
Compliance ................................................................................................................................................................ 34
FCC Compliance ................................................................................................................................................. 34
CE Compliance ................................................................................................................................................... 34
BACnet Compliance........................................................................................................................................... 34

Carrier RTU Open v3 Specifications

General

Brand	Carrier
Model	RTU Open v3
Category	Controller
Language	English