Carrier 11-808-427-01 User Manual

RTU Open

Table of Contents

Introduction .................................................................................................................................................................. 1

What is the RTU Open controller? ...................................................................................................................... 1

Specifications ........................................................................................................................................................ 3

Safety considerations........................................................................................................................................... 4

Installation ................................................................................................................................................................... 5

Field-supplied hardware ...................................................................................................................................... 5

To mount the RTU Open ....................................................................................................................................... 6

To wire the controller for power.......................................................................................................................... 7

Using the rooftop equipment control power transformer ................................................................... 7

Using an auxiliary control power transformer ...................................................................................... 8

To set the RTU Open's address ........................................................................................................................... 9

To set the RTU Open's communications protocol and baud rate ............................................................... 10

Wiring the RTU Open to the MS/TP network ................................................................................................. 10

Wiring specifications ........................................................................................................................... 11

To wire the controller to the network ................................................................................................. 11

Wiring inputs and outputs ................................................................................................................................ 12

Input wiring specifications .................................................................................................................. 13

Inputs ................................................................................................................................................... 13

Binary outputs ..................................................................................................................................... 14

Analog output ...................................................................................................................................... 14

To wire inputs and outputs ................................................................................................................. 14

Wiring sensors to inputs ................................................................................................................................... 18

Field-supplied sensor hardware ......................................................................................................... 19

Wiring an SPT sensor .......................................................................................................................... 20

Rnet wiring specifications ........................................................................................................ 20

To wire the SPT sensor to the controller ................................................................................. 21

Wiring a Supply Air Temperature sensor ............................................................................................ 21

Wiring specifications ................................................................................................................ 22

To wire the SAT sensor to the controller ................................................................................. 22

Wiring a Duct Air Temperature sensor ............................................................................................... 22

Wiring specifications ................................................................................................................ 22

To wire a duct sensor to the controller ................................................................................... 23

Wiring an Outdoor Air Temperature sensor ....................................................................................... 23

Wiring specifications ................................................................................................................ 23

To wire an OAT sensor to the controller .................................................................................. 23

Wiring a CO2 sensor ............................................................................................................................ 24

Wiring specifications ................................................................................................................ 24

To wire the CO2 sensor to the controller ................................................................................ 24

Wiring an Outdoor Air Quality sensor ................................................................................................. 25

Wiring specifications ................................................................................................................ 26

To wire the OAQ sensor to the controller ................................................................................ 26

Wiring a Relative Humidity sensor ..................................................................................................... 26

Wiring specifications ................................................................................................................ 27

To wire the RH sensor to the controller................................................................................... 27

Wiring a Humidistat ............................................................................................................................. 27

Wiring specifications ................................................................................................................ 27

To wire a humidistat to the controller ..................................................................................... 28

Wiring an enthalpy switch ................................................................................................................... 28

Wiring specifications ................................................................................................................ 28

To wire an enthalpy switch (outdoor air) to the controller ..................................................... 29

To wire an enthalpy switch (differential) to the controller...................................................... 30