Carrier RTU Open v3, OPN-RTUM2 Integration Manual

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RRTTUU OOppeenn vv33

IInntteeggrraattiioonn GGuuiiddee

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Document revision history

Verify that you have the most current version of this document from

or your local Carrier

office.

Important changes are listed in

at the end of this document.

CARRIER CORPORATION ©2016. All rights reserved throughout the world. i-Vu is a registered trademark of Carrier Corporation. BACnet is a registered trademark of ASHRAE. All other trademarks are the property of their respective owners.

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

Wiring inputs and outputs ........................................................................................................................................... 4

Communications wiring .............................................................................................................................................. 6

Start-up ....................................................................................................................................................................... 17

Sequence of Operation ............................................................................................................................................. 18

Troubleshooting ......................................................................................................................................................... 32

Compliance ................................................................................................................................................................ 34

Contents

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

Safety considerations & handling warning ....................................................................................................... 3

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

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

LED's .................................................................................................................................................................... 32

FCC Compliance ................................................................................................................................................. 34

CE Compliance ................................................................................................................................................... 34

BACnet Compliance........................................................................................................................................... 34

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Contents

Appendix A: Network Points List for RTU Open ...................................................................................................... 35

Appendix B: BACnet Protocol Implementation Conformance Statement ........................................................... 46

Appendix C: Modbus Protocol Implementation Conformance Statement........................................................... 47

Appendix D: Johnson N2 Protocol Implementation Conformance Statement .................................................... 49

Appendix E: LonWorks Protocol Implementation Conformance Statement ....................................................... 51

Document revision history ........................................................................................................................................ 52

Index ........................................................................................................................................................................... 53

Network points list for BACnet and Modbus ................................................................................................. 35

Network points list for N2 and LonWorks ...................................................................................................... 43

Page 5

What is the RTU Open controller?

NOTE

The RTU Open supports the following:

ZS Sensors

Third party protocols

Mixed systems

California Title 24

Equipment Touch

Introduction

The RTU Open controller (part# OPN-RTUM2) is available as an integrated component of a Carrier rooftop unit, or as a field-installed retrofit product.

The RTU Open controller is available in both English or Metric units. The metric version has (-M) appended

to the part number. Everything in this document applies to both versions.

Its internal application programming provides optimum rooftop performance and energy efficiency. RTU Open enables the unit to run in 100% stand-alone control mode or it can communicate to the Building Automation System (BAS).

•

IAQ/CO2. Sensors provide:

○ Space setpoint offset adjustment

○ Pushbutton override

○ Occupancy indicator

•

following protocols:

○ BACnet

○ Modbus

○ Johnson N2

○ LonWorks

•

- 3 models are available for monitoring space temperature, space relative humidity, and space

- On-board DIP switches allow you to select the baud rate and choose one of the

- Supports CCN air terminals using Linkage to BACnet RTU Open Air Source

•

accordance with California Title 24 requirements

•

device with a 4.3 in. color LCD display that you connect to the RTU Open (driver v6.00:082 or later) to view or change its property values, schedule equipment, view trends and alarms, and more, without having to access the system's server.

The RTU Open’s application supports detailed color graphics, status, properties, alarms, trends, performance, configuration, and help on the Equipment Touch. In addition, an RTU Open Startup Wizard has specific screens to facilitate the Carrier Controls installation technician in initially configuring the RTU Open.

For more details about the Equipment Touch, see the Equipment Touch Installation and Setup Guide.

- Includes advanced Fault Detection and Diagnostic Logic for Economizer Operation in

- Carrier Commercial Control’s user interface. The Equipment Touch is a touchscreen

Page 6

Introduction

Page 7

Introduction

Safety considerations & handling warning

WARNING

When you handle the RTU Open:

• Do not contaminate the printed circuit board with fingerprints, moisture, or any foreign material.

• Do not touch components or leads.

• Handle the board by its edges.

• Isolate from high voltage or electrostatic discharge.

• Ensure that you are properly grounded.

Page 8

Wiring inputs and outputs

RTU Open Inputs and Outputs Table

Channel Number

Type Signal

Function

Part Number

Wire/Terminal Numbers

Alternate Terminals

Input 1

4-20 mA

CO2

33ZCT55CO2 33ZCT56CO2

N/A

Input 2

4-20 mA

CO2

33ZCT55CO2 33ZCT56CO2

J4 -

N/A

Input 3

24 Vac

N/A

J1 -

Input 4

24 Vac

Safety Chain *

N/A

Input 5

24 Vac

Field-supplied

Input 6

10K

Supply Air Temperature

33ZCSENSAT 33ZCSENDAT

J2 - 1 & 2

N/A

Input 7

10K

Outside Air Temperature

33ZCSENOAT

J2 - 3 & 2

N/A

Input 8

24 Vac

Enthalpy **

33SENTHSW

Input 9

24 Vac

Humidistat **

--HL--38MG-029

J5 - 7 & 8

N/A

Input 10

10K

Space Temperature

33ZCT55SPT 33ZCT56SPT

J20 - 1 & 2

N/A

Input 11

100K

Space Temperature

33ZCT56SPT 33ZCT59SPT

J20 - 3 & 4

N/A Rnet

AI Zone Temperature

SPS / SPPL / SPP

J13

N/A

AO - 1

Economizer

Actuator-Field-supplied

N/A

AO - 2

0-10 Vdc or

Variable Frequency Drive

Field-supplied

J22

N/A BO - 1

N/A - Relay

Fan (G)

N/A

BO - 2

N/A - Relay

Heat 2 (W2) Output

N/A

BO - 3

N/A - Relay

Heat 1 (W1) Output

N/A

BO - 4

N/A - Relay

Cool 2 (Y2) Output

N/A

J1 - 7

N/A

Wiring inputs and outputs

OAQ Space Relative Humidity

Compressor Safety **2 Fan Status Filter Status Remote Occupancy Door Contact

Fire Shutdown **1, 2 Fan Status Filter Status Remote Occupancy Door Contact

Thermistor

33ZCSPTCO2-01 33ZCSPTCO2LCD-01 w/ 33ZCASPCO2

33ZCSENSRH-02

33ZCSPTCO2-01 33ZCSPTCO2LCD-01

w/ 33ZCASPCO2 33ZCSENSRH-02

CRSTATUS005A00 CRSTATUS005A00 Field-supplied Field-supplied

CRSTATUS005A00 CRSTATUS005A00

Field-supplied Field-supplied

- 5 & 6

2 & 3

***

- 9

- 10 ***

- 5 & 6

- 3 & 4

Thermistor

- 6 & 7

Fan Status Filter Status Remote Occupancy Door Contact

Thermistor

2-10 Vdc

Setpoint Adjust

CRSTATUS005A00 CRSTATUS005A00 Field-supplied Field-supplied

33ZCT59SPT

- 1, 2, 3, 4

- 5 & 4

- 1 & 2

- 4

- 5

- 6

***

- 1 & 2

Page 9

Wiring inputs and outputs

Channel Number

Type Signal

Function

Part Number

Wire/Terminal Numbers

Alternate Terminals

BO - 5

N/A - Relay

Cool 1 (Y1) Output

N/A

BO - 6

N/A - Relay

Humidi-MiZer™

N/A

J11

N/A

BO - 7

N/A - Relay

Reversing Valve / High Speed Fan

N/A

J11

N/A BO - 8

N/A - Relay

Power Exhaust

N/A

J11

N/A

Legend

Safety Chain Feedback

Run Enabled

Default input function

***

N.C. contact must be used as a primary safety device for approved fire shutdown operation. N.O. contact for monitoring only. If a function other the default is used, do NOT connect wires from J1-x.

- Analog Input

- Digital Input

no safeties are used. See "To wire inputs and outputs" in the Open wiring harness assembly terminations.

Parallel screw terminal at J5 (J5 - 1 = J2 - 6, J5 - 3 = J1 - 10, J5 - 5 = J1 - 2) may be used in place of the associated flying leads at the harness (Part# OPN-RTUHRN). See "To wire inputs and outputs" in the information.

- Analog Output

- Digital Output

- 24 Vac required at this wire to provide

- 8

- 7 & 8

- 5 & 6

- 2 & 3

status. Provide a jumper from J1 - 1 to

RTU Open Installation Guide for additional information on the RTU

RTU Open Installation Guide for additional

- 9 if

Page 10

Communications wiring

Protocol overview

SW3

MSB

SW1

LSB (SW2

J19

J15

NOTES

MSB (SW1

LSB (SW2

J15

SW3 Switch Settings Table

Protocol Selection

Baud Rate

Protocol

DS8

DS7

DS6

DS5

DS4

DS3

DS2

DS1

BACnet MS/TP

Modbus

Lonworks

Baud Selection Table

Baud Rate

SW3/DS2

SW3/DS1

9,600

19,200

38,400

76,800

Communications wiring

Protocols are the communication languages spoken by the control devices. The main purpose of a protocol is to communicate information in the most efficient method possible. Different protocols exist to provide specific information for different applications.

In the BAS application, many different protocols are used, depending on manufacturer. Different protocols do not change the function of the controller, but they typically require the owner to change systems or components in order to change from one protocol to another. The RTU Open is an effective solution to minimize the amount of controllers that you may need to change in order to communicate with different types of protocols.

You can set the controller to communicate 1 of 4 different protocols:

• BACnet MS/TP (page 7)

• Modbus (page 9)

• N2 (page 12)

• LonWorks (page 14)

The default setting is BACnet MS/TP. Switch 3 ( (

) and

) set the board’s network address. See table below for specific switch settings. The third party connects to the controller through port LonWorks Option Card.

• Changing protocol requires no programming or point assignment by the installer or operator.

) on the board sets protocol and baud rate. Switches

for BACnet MS/TP, Modbus, and N2, and through

for the

• Power must be cycled after changing the

Card to

) -

) settings or connecting the LonWorks Option

Master Unused Off Off Off On Off Select Baud Select Baud

(Default)

Slave Unused Off Off On On Off Select Baud Select Baud

Slave Unused Off Off Off On On Off Off

Unused On On Off On Off Off On

Off Off

On Off

Off On

(Default) On On

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Communications wiring

BACnet MS/TP

To set up the RTU Open for BACnet MS/TP

NOTE

off

NOTE

MSB (SW1

LSB (SW2

MSB (SW1

LSB (SW2

NOTE

EXAMPLE

MSB (SW1

LSB (SW2

SW3

DS1

DS2

NOTE

Baud Selection Table

Baud Rate

SW3/DS2

SW3/DS1

9,600

19,200

38,400

76,800

SW3

DS3

DS6

DS7

DS8

SW3 Protocol Switch Settings for MS/TP

DS8 DS7 DS6 DS5 DS4 DS3

Refer to Appendix B (page 46) for the Protocol Implementation Conformance Statement, or download the latest from BACnet International http://www.bacnetinternational.net/catalog/index.php?m=28.

This controller counts as a full load on the MS/TP bus.

1 Turn

2 Using the rotary switches

the RTU Open's power.

Changes made to the switches when the controller is on will not take effect until the power is cycled!

Set the Valid addresses are 01-99.

The rotary switches also determine the BACnet device instance of the controller on the BACnet network. The BACnet device instance is automatically generated based on the scheme 16101xx, where “16” is the BACnet vendor ID for Carrier Corporation, and xx equals the rotary switch address.

and the arrow on the generated as 1610101.

To set the controller’s MS/TP MAC address to 01, point the arrow on the

) switch to the tens digit of the address, and set the

) and

) switch to 1. Internally, the BACnet device instance is automatically

), set a unique MS/TP MAC address for the RTU Open.

) switch to the ones digit.

) switch to 0

3 Set the

4 Set

5 Leave

Comm Selector DIP switches

19.2k, 38.4k, or 76.8k bps).

Use the same baud rate and communication settings for all controllers on the network segment. The

RTU Open is fixed at 8 data bits, No Parity, and 1 Stop bit for this protocol's communications.

Off Off

On Off

Off On

On On

Comm Selector DIP switches

and

in the OFF position. These switches are not applicable to MS/TP.

and

for the appropriate communications speed (9600,

through

for BACnet MS/TP. See table and example below.

Off Off Off Off On Off

Page 12

Communications wiring

J19

Net+, Net-

SHLD

Wire specifications

NOTE

Troubleshooting BACnet MS/TP

Check the following to troubleshoot your RTU Open:

DS3 - DS6

Network Communications

The following example shows the DIP switches set for 76.8k (Carrier default), and MS/TP.

6 Connect the MS/TP network to the controller's

port. Connect to

, and

○ A dedicated 22 AWG shielded twisted pair wire (EIA 485)

○ Maximum wire length 2000 feet (610 meters) or 32 nodes

○ Devices should be daisy-chained and not star-wired

○ Attach the drain/shield wire to both ends of the network segment and through every controller

Use the same polarity throughout the network segment.

7 Turn on the RTU Open's power.

1 Verify that the BAS and controller are both set to speak the BACnet MS/TP protocol on the Comm Selector

DIP switches

2 Verify that the BAS and the controller are both set for the same baud rate:

○ Baud rate DIP switches DS2 and DS1

○ Obtain a Modstat of the controller. Scroll to the bottom of the page to

the active protocol and baud rate.

3 Verify that the BAS is configured to speak 2-wire EIA-485 to the controller. The BAS may have to configure

jumper or DIP switches on their end.

4 Verify that the BAS and the controller have the same communication settings (8 data bits, No Parity, and 1

stop bit).

5 Verify proper connection wiring between the BAS and the controller.

6 Verify that the controller has a unique MAC address on the MS/TP bus. The controller’s MS/TP MAC address

is set by its rotary address switches.

to view

Page 13

Communications wiring

It may be necessary to adjust the following MS/TP protocol timing settings through the Equipment Touch device:

Max Masters

Max Info Frames

NOTES

Modbus

To set up the RTU Open for Modbus

off

NOTE

MSB (SW1

LSB (SW2

7 Verify that the BAS is reading or writing to the proper BACnet objects in the controller. Refer to Appendix A for

the points list for the controller.

8 Verify that the BAS is sending his requests to the proper MS/TP MAC address of our controller.

9 Present the BAS company with a copy of the controller’s BACnet PICS so that they know which BACnet

commands are supported. The PIC statements are updated regularly. Please refer to the BACnet website http://www.bacnetinternational.net/catalog/index.php?m=28 for the latest information. In certain

situations, it may be necessary to adjust the MS/TP Protocol timing settings through the Equipment Touch device.

- defines the highest MS/TP Master MAC address on the MS/TP network.

For example, if there are 3 master nodes on an MS/TP network, and their MAC addresses are 1, 8, and 16, then Max Masters would be set to 16 (since this is the highest MS/TP MAC address on the network).

This property optimizes MS/TP network communications by preventing token passes and “poll for master” requests to non-existent Master nodes.

In the above example, MAC address 16 knows to pass the token back to MAC address 1, instead of counting up to MAC address 127. Each MS/TP master node on the network must have their Max Masters set to this same value. The default is 127.

- defines the maximum number of responses that will be sent when the RTU Open receives the token. Any positive integer is a valid number. The default is 10 and should be ideal for the majority of applications. In cases where the RTU Open is the target of many requests, this number could be increased as high as 100 or

200.

• MS/TP networks can be comprised of both master and slave nodes. Valid MAC addresses for master nodes

are 0 – 127 and valid addresses for Slave nodes are 0 - 254.

• If the third party attempts to communicate to the controller but does not get a response, make sure the

controller is set as a BACnet MS/TP (m) master. The BACnet software asks the controllers, “Who Is?” This is to auto-locate devices on the network. Only controllers set as masters will answer this request.

• See Appendix A (page 35) for Points Mapping tables.

Refer to Appendix C (page 47) for the Modbus Protocol Implementation Conformance Statement (PICS).

1 Turn

2 Using the rotary switches, set a unique Modbus slave address for the RTU Open. Set the

the RTU Open's power.

Changes made to the switches when the controller is on will not take effect until the power is cycled!

the tens digit of the address, and set the are 01-99.

) switch to

) switch to the ones digit. Valid Modbus slave addresses

Page 14

Communications wiring

EXAMPLE

MSB (SW1

LSB (SW2

SW3

DS1

DS2

NOTE

Baud Selection Table

Baud Rate

SW3/DS2

SW3/DS1

9,600

19,200

38,400

76,800

SW3

DS3

DS6

DS7

DS8

SW3 Protocol Switch Settings for Modbus

DS8 DS7 DS6 DS5 DS4 DS3

J19

Net+, Net-

SHLD

and the arrow on the

To set the controller's Modbus slave address to 01, point the arrow on the

) switch to 1.

3 Set the

Comm Selector DIP switches

and

for the appropriate communications speed (9600,

19.2k, 38.4k, or 76.8k bps).

Use the same baud rate and communication settings for all controllers on the network segment. The

RTU Open is fixed at 8 data bits, No Parity, and 1 Stop bit for this protocol's communications.

Off Off

On Off

Off On

On On

through

for Modbus. See example below.

4 Set

5 Leave

Comm Selector DIP switches

and

in the OFF position. These switches are not applicable to Modbus.

) switch to 0

Off Off Off On On Off

The following example shows the DIP switches set for 9600 baud and Modbus.

6 Connect the Modbus EIA-485 network to the RTU Open's

port. Connect to

, and

Page 15

Communications wiring

Wire specifications

NOTE

Troubleshooting Modbus

Check the following to troubleshoot your RTU Open:

DS3 - DS6

Network Communications

NOTES

Modbus Exception Codes that might be returned from this controller

Codes

Name

Description

○ A dedicated 22 AWG shielded twisted pair wire (EIA 485)

○ Maximum wire length 2000 feet (610 meters) or 32 nodes

○ Devices should be daisy-chained and not star-wired

○ Attach the drain/shield wire to both ends of the network segment and through every controller

Use the same polarity throughout the network segment.

7 Turn on the RTU Open's power.

1 Verify that the BAS and controller are both set to speak the Modbus RTU protocol on the Comm Selector DIP

switches

2 Verify that the BAS and the controller are both set for the same baud rate:

○ Baud rate DIP switches DS2 and DS1

○ Obtain a Modstat of the controller. Scroll to the bottom of the page to

3 Verify that the BAS is configured to speak 2-wire EIA-485 to the controller. The BAS may have to configure

jumper or DIP switches on their end.

4 Verify that the BAS and the controller have the same communication settings (8 data bits, No Parity, and 1

stop bit).

5 Verify proper connection wiring between the BAS and the controller.

6 Verify that the rotary address switches are set for the controller's unique slave address.

7 BAS must be reading or writing to the proper point addresses on the controller.

8 BAS is sending requests to the proper slave address of the controller.

• Refer to Appendix A (page 35) for the Network Points list.

the active protocol and baud rate.

to view

• Refer to Appendix C (page 47) for the Protocol Implementation Conformance Statement.

01 Illegal Function The Modbus function code used in the query is not

02 Illegal Data

Address

04 Slave Device

Failure

supported by the controller.

The register address used in the query is not supported by the controller.

The Modbus Master has attempted to write to a nonexistent register or a read-only register in the controller.

Page 16

Communications wiring

Johnson N2

To set up the RTU Open for N2

off

NOTE

MSB (SW1

LSB (SW2

EXAMPLE

MSB (SW1

LSB (SW1

DS1

DS2

NOTE

SW3

DS3

DS6

DS7

DS8

SW3 Protocol Switch Settings for N2

DS8 DS7 DS6 DS5 DS4 DS3

J19

Net+, Net-

SHLD

Refer to Appendix D (page 49) for the N2 Protocol Implementation Conformance Statement (PICS).

1 Turn

2 Using the rotary switches, set a unique N2 slave address for the RTU Open. Set the

3 Set the Comm Selector DIP switches

4 Set

5 Leave

the RTU Open's power.

Changes made to the switches when the controller is on will not take effect until the power is cycled!

tens digit of the address, and set the

the

RTU Open is fixed at 9600 baud, 8 data bits, No Parity, and 1 Stop bit.

To set the N2 slave address to 01, point the arrow on the

Use the same baud rate and communication settings for all controllers on the network segment. The

) switch to 1.

Comm Selector DIP switches

and

in the OFF position. These switches are not applicable to N2.

) switch to the ones digit. Valid N2 slave addresses are 01-99.

and

through

for the 9600 baud.

for N2. See example below.

) switch to 0 and the arrow on

) switch to the

Off Off Off Off On On

The following example shows the DIP switches set for 9600 baud and N2.

6 Connect the N2 EIA-485 network to the controller's

port. Connect to

, and

Page 17

Communications wiring

Wire specifications

NOTE

Troubleshooting N2

Check the following to troubleshoot your RTU Open:

DS3 -

DS6

Network Communications

NOTES

○ A dedicated 22 AWG shielded twisted pair wire (EIA 485)

○ Maximum wire length 2000 feet (610 meters) or 32 nodes

○ Devices should be daisy-chained and not star-wired

○ Attach the drain/shield wire to both ends of the network segment and through every controller

Use the same polarity throughout the network segment.

7 Turn on the RTU Open's power.

1 Verify that the BAS and controller are both set to speak N2 protocol on the Comm Selector DIP switches

2 Verify that the BAS and the controller are both set for the same baud rate:

○ 9600 for N2

○ Baud rate DIP switches DS2 and DS1

○ Obtain a Modstat of the controller. Scroll to the bottom of the page to

to view

the active protocol and baud rate.

3 Verify that the BAS is configured to speak 2-wire EIA-485 to the controller. The BAS may have to configure

jumper or DIP switches on their end.

4 Verify that the BAS and the controller have the same communication settings (8 data bits, No Parity, and 1

stop bit).

5 Verify proper connection wiring between the BAS and the controller.

6 Verify that the rotary address switches are set for the controller's unique slave address.

7 BAS must be reading or writing to the proper point addresses on the controller.

8 BAS is sending requests to the proper slave address of the controller.

• Refer to Appendix A (page 35) for the Network Points list.

• Refer to Appendix D (page 49) for the Protocol Implementation Conformance Statement.

Page 18

Communications wiring

LonWorks

Ensure that you are properly grounded.

To set up the RTU Open for the LonWorks Option Card (Part #LON-OC)

off

NOTES

DS1

DS2

SW3

DS3

DS6

SW3

DS7

SW3

DS8

SW3

SW3 Protocol Switch Settings for LonWorks

DS8 DS7 DS6 DS5 DS4 DS3

When you handle the LonWorks Option Card:

• Do not contaminate the printed circuit board with fingerprints, moisture, or any foreign material.

• Do not touch components or leads.

• Handle the board by its edges.

• Isolate from high voltage or electrostatic discharge.

•

Refer to Appendix E (page 51) for the LonWorks Protocol Implementation Conformance Statement (PICS).

1 Turn

2 Set the Comm Selector DIP switches

3 Set the Comm Selector DIP switches

4 Set the Comm Selector DIP switch

5 Leave Comm Selector DIP switch

the RTU Open's power.

○ Changes made to the switches when the controller is on will not take effect until the power has been

cycled!

○ The controller’s rotary address switches are not used when the LON-OC is installed. That’s because each

LON-OC has a 48-bit Neuron ID that makes it unique on the LonWorks network.

and

for 38.4k Communications speed. This is the

speed at which the LON-OC speaks to the RTU Open. It is fixed at 38.4k.

through

for LonWorks. See example below.

to the ON position to enable the LON-OC.

in the OFF position since it is not used.

Off On On Off On Off

Page 19

Communications wiring

J15

CAUTION!

OFF

Net

NOTE

Net

polarity insensitive

Commissioning the controller for LonWorks communication

The following example shows the DIP switches set for 38.4k baud and the LON-OC enabled.

6 Plug the LON-OC's ribbon cable into Comm Option Port

The controller must be

before being connected.

on the controller. See illustration below.

7 Connect the LonWorks network to the LON-OC via the 2-pin

The 2-pin

type is

port provides TP/FT-10 channel compatibility. The TP/FT-10 or "Free Topology" network

. Use 24 to 16 AWG twisted pair wire.

port.

8 Turn on the RTU Open's power.

9 Commission the controller for LonWorks communication. See instructions below.

Before a device can communicate on a LonWorks network, it must be commissioned. Commissioning allows the system integrator to associate the device hardware with the LonWorks system’s network layout diagram. This is done using the device’s unique Neuron ID.

A network management tool such as Echelon’s LonMaker is used to commission each device, as well as, to assign addressing. Specific instructions regarding the commissioning of LonWorks devices should be obtained from documentation supplied with the LonWorks Network Management Tool.

Page 20

Communications wiring

Browse

Troubleshooting LonWorks

Check the following to troubleshoot your RTU Open:

DS3 - DS6

Network Communications

SW3

DS7

Browse

When a new device is first commissioned onto the LonWorks network, the system integrator must upload the device’s External Interface File (XIF) information. LonWorks uses the XIF to determine the points (network variables) that are available from a device. The RTU Open has a set of predefined network variables. These variables can be bound or accessed by the Network Management Tool.

The

feature of the Network Management Tool allows you to read real-time values from the RTU Open. The Network Management Tool allows you to test integration prior to binding the controller's network variables to other LonWorks nodes.

1 Verify that the BAS and controller are both set to speak the LonWorks protocol by theComm Selector DIP

switches

2 Verify that the BAS and the controller are both set for the same baud rate:

○ 38.4k for LonWorks

○ Baud rate DIP switches DS2 and DS1

○ Obtain a Modstat of the controller. Scroll to the bottom of the page to

to view

the active protocol and baud rate.

3 BAS must be reading or writing to the proper point addresses on the controller.

4 Verify that the Comm Option Port is enabled on the controller. The Comm Option Port setting must be set via

(switch

). It should be in the ON position to enable LonWorks communication.

5 Verify that controller has been properly commissioned onto the LonWorks network. See Commissioning the

controller for LonWorks communication (page 15).

6 Use the

feature of the network management tool to verify that you can communicate and get real-

time values from the controller before connecting the BAS.

7 Once you have confirmed communications with the controller using the network management tool, connect

the BAS.

8 Verify that the BAS is connected properly to the LonWorks Option Card's 2-wire TP/FT-10 Net port, which is

polarity insensitive. The BAS may have to configure jumper or DIP switches on their end to support TP/FT-10.

Page 21

Start-up

This interface...

Provides a...

Field Assistant

Equipment Touch

i-Vu®

System Touch

CAUTION

Start-up

To start up the RTU Open, you need one of the following user interfaces to the controller. These items let you access the controller information, read sensor values, and test the controller.

application -

Runs on a laptop that connects to controller's Local Access port

device -

Connects to controller's Rnet port

application

Available for BACnet systems only

device

Available for BACnet systems only

Temporary or permanent interface

Permanent interface

Temporary or permanent interface

Temporary interface

Wire to an MS/TP network connector and a 24 Vac power supply 3

Requires a USB Link (Part #USB-L).

See the Equipment Touch Installation and Setup Guide for detailed instructions.

See the System Touch Installation and Setup Guide for detailed instructions.

If multiple controllers share power but polarity was not maintained when they were wired, the difference between the controller's ground and the computer's AC power ground could damage the USB Link and the controller. If you are not sure of the wiring polarity, use a USB isolator between the computer and the USB Link. Purchase a USB isolator online from a third-party manufacturer.

Page 22

Sequence of Operation

Occupancy

Occupied/Unoccupied

Occupied

NOTE

Occupancy Source

Always Occupied

BACnet Schedule

BAS On/Off

Remote Occ Input

Unit Configuration

Occupancy Source

Remote Occ Input

Input Switch Configuration

Remote Occupancy

Sequence of Operation

The RTU Open supports various types of constant volume air source configurations:

• Standard heat/cool unit types with up to 2-stages of mechanical cooling and gas or electric heating

• Heat pump units utilizing a reversing valve output for heating and cooling control

• Heat pump unit (Carrier) with an OEM defrost control board

• Economizer, CO2, Demand Limiting, and RH control strategies are available for appropriately equipped units

• LC WeatherExpert™ unit with 3-stage compressor control and variable speed supply fan control.

The RTU Open may operate as part of a VVT system using Airside Linkage or as a stand-alone controller.

The RTU Open’s operation depends upon its occupancy state ( continuously in the

mode until you configure an occupancy schedule.

). The RTU Open operates

An occupancy schedule may be:

• A local schedule configured in the controller using an Equipment Touch or Field Assistant

• A BACnet schedule configured in the i-Vu® application, networked through an i-Vu® Open Router

• A BACnet or local schedule configured for subordinate VVT Zones, networked through an i-Vu® Open

Router(s) and employing Linkage

To set up occupancy schedules, see the documentation for your user interface.

A BACnet schedule, downloaded from the i-Vu® application will overwrite a local schedule that was set up

with an Equipment Touch or Field Assistant.

- the following settings determine occupancy.

Options:

•

– (default) Controller operates continuously, regardless of any configured schedule

– Uses a local BACnet occupancy schedule configured within the controller

– Occupancy is set over the network by another device or a third party BAS. Refer to the RTU

Open Integration Guide for additional instructions in communication protocols.

•

configured to receive it. You must set

– Controller monitors an input contact connected to one of the available binary inputs

and one

Page 23

Sequence of Operation

Supply fan

Fan Control modes

Single

Two Speed

Variable Speed

Fan Modes

Auto

Continuous

Always On

Fan Off Delay

Fire Shutdown Safety chain Supply Air Temp Sensor Space Temp Sensor

Supply Fan Status

Supply Fan Alarm Service Timer

Cooling

Outdoor Air Temperature

Cooling Lockout Temperature

Supply Air Temperature

Space Temperature

The RTU Open supply fan may be configured for 1 of 3

•

- The fan operates at one speed only and provides on/off operation

•

- The fan operates at 1 of 2 speeds depending on the mode of operation and load conditions.

During fan only or single stage cooling, the fan operates at low speed. During heating, second stage cooling, dehumidification, or if maximum economizer operation is required, the fan operates at high speed.

•

- The fan operates at a variable speed to meet the load conditions and SAT safety requirements to provide maximum energy savings by minimizing fan horsepower consumption. Fan speed is NOT controlled by static pressure.

The RTU Open supply fan may be configured for 1 of 3

•

- The fan cycles on/off in conjunction with heating or cooling

•

- The fan runs continuously during occupancy and intermittently during unoccupied periods with

heating or cooling

•

- The fan runs continuously regardless of occupancy or calls for heating and cooling

Occupancy can be determined by Linkage, BACnet schedules, BAS schedules, or in response to a remote occupancy switch.

allows the supply fan to continue operating after heating or cooling stops.

If the following alarms are active, the fan turns off immediately, regardless of the occupancy state or demand:

•

alarm

The RTU Open does not include smoke-control functions such as smoke-purge, zone-pressurization, or smokeventilation.

The RTU Open may be configured to accept a

input to provide proof the supply fan is operating.

When enabled, a loss or lack of fan status will stop heating and cooling operation.

function is available to track the number of supply fan run hours and generate

an alarm when the accumulated runtime exceeds the set threshold.

The RTU Open's application and configuration determines the specific cooling sequence. The RTU Open can control up to 2 stages of cooling with an additional output for a reversing valve (heat pump applications). The number of stages is configurable or is defined by unit type.

The following conditions must be true for the cooling algorithm to operate:

•

• The indoor fan is on

• The unit has a valid

, if valid, is greater than the

input

setpoint

Page 24

Sequence of Operation

Minimum Cooling SAT

Effective

Cooling Setpoint

Space Temperature

Effective Occupied Cooling Setpoint

Effective Unoccupied Cooling Setpoint

Minimum Cooling SAT Setpoint

Supply Air Temperature

Minimum Cooling SAT Setpoint

Compressor Service Alarm Timer

Economizer

Outdoor Air Temperature

Space Temperature

Economizer High OAT

Lockout Temp

Supply Air Temperature

Space Temperature

Vent Dmpr Pos / DCV Min Pos

Low Fan Econ Min Pos

Minimum Cooling

SAT

• Heat mode is not active and the 5-minute time guard between modes has expired

• Economizer is unavailable, or if the Economizer is active, mechanical cooling is available if the economizer is

open > 90% for at least 7.5 minutes, the SAT > [

+ 0.5 °F (.27 °C)].

+ 5 °F (2.7 °)] and SPT > [

The cooling relays are controlled by the Cooling Control PID Loop and Cooling Capacity algorithm. They calculate the desired number of stages needed to satisfy the space by comparing the

•

when occupied

when unoccupied

to the:

When the cooling algorithm preconditions have been met, the compressors are energized in stages, as applicable. Anti-recycle timers are employed to protect the equipment from short-cycling. There are fixed 3 minute minimum on-times, and 5 minute off-times for each compressor output.

During compressor operation, the RTU Open may reduce the number of active stages if the rooftop supply air temperature falls below the started again after the normal time-guard period has expired, if the the

. A compressor staged off in this fashion may be

has increased above

functions are available (1 for each stage of compression). This function tracks the number of compressor run hours and generates an alarm when the accumulated runtime exceeds the threshold set by the adjustable compressor service alarm timers.

The RTU Open provides an analog economizer output for rooftop units with economizer dampers. Economizer dampers may be used to provide indoor air quality control and free cooling when outside air conditions are suitable.

The following conditions must be true for economizer operation:

• The

• The indoor fan is on

• The unit has a valid

If the RTU Open is configured for VFD or 2-speed fan, the economizer minimum position is adjusted to provide a constant amount of outdoor air. If the fan is on high speed or is configured for single-speed fan, the economizer minimum position will be set to the fan, and the fan is on low speed, the economizer minimum position will be set to the

If all preceding conditions are true, the economizer PID loop modulates the damper between the minimum position and 100% open..

During economizer operation, the economizer position is reduced as the SAT falls below the

The RTU Open provides FDD (Fault Detection and Diagnostics) for economizer operation in compliance with California Title 24. The FDD logic will detect an economizer that fails to close, fails to open, is stuck fully open, and fails to fully open. Each condition will cause an Economizer Operation alarm to occur and the specific fault condition will be displayed.

+ 5 °F (2.8 °C), but never closes below the applicable minimum position.

is less than the

setpoint

input

and less than the

setpoint. If it is configured for VFD or 2-speed

Page 25

Sequence of Operation

Power Exhaust

Fan Control

Two Speed

Variable Speed

Power Exhaust

Setpoint

Calculated PE Setpoint

Maintenance

Continuous Occupied Exhaust

Yes

Power Exhaust

Continuous Occupied Exhaust

Power Exhaust

Calculated Power Exhaust (PE) Setpoint

Power Exhaust Setpoint

Pre-Occupancy Purge

Pre Occupancy Purge

Pre-Occupancy Purge

Enable

Economizer Exists

Yes

Purge

Time

Economizer Purge Min Pos

Pre-Occ Purge

Maintenance

Unoccupied Free Cooling

Unocc Free Cool Enable

Enable

Economizer High OAT Lockout Temp

Enthalpy

Low

The RTU Open may enable and disable an exhaust fan, based on either the controller’s occupancy or its economizer damper position. If the

displayed in the

is automatically adjusted based on the fan’s air delivery. The

section.

, the

is set to

, the

used for control is

binary output (BO-8) is energized while the RTU Open

is occupied and de-energized when unoccupied.

If damper output exceeds the economizer output falls below the

is No, the

binary output (BO-8) is energized when the economizer

value by a fixed hysteresis of 10%.

value. The output remains energized until the

allows the rooftop equipment with an economizer damper to use outdoor air to purge the

space of contaminants just prior to the beginning of the occupied period.

The following conditions must be true for pre-occupancy purge to operate:

•

set to

• A local time schedule is configured

• The local time schedule is currently unoccupied and the remaining time is less than the configured

When the RTU Open schedule is unoccupied and the remaining unoccupied time is less than the purge time, the supply fan starts. The economizer damper opens to the configured continues to operate in this mode until the occupied start time is reached. The the

section.

during unoccupied periods.

The following conditions must be true for unoccupied free cooling to operate:

•

allows rooftop equipment with an economizer damper to use outdoor air for free cooling

set to

. The RTU Open

state is displayed in

• The system is unoccupied

• The outside air temperature is below the

• The outside air temperature is less than the space temperature

•

(if enabled) is

setpoint

Page 26

Sequence of Operation

Occupied Cooling Setpoint

Optimal Start

Learning Adaptive Optimal Start

Properties

Equipment

Configuration

Setpoints

Optimal Start

0 (0.00

Optimal Start

NOTE

Learning Adaptive Optimal Start

NOTE

Learning Adaptive Optimal Start

Properties

Equipment

Configuration

Setpoints

When the RTU Open schedule is unoccupied and the space temperature rises at least 1 °F (.5 °C) above the

, the supply fan starts. The economizer damper opens as necessary to cool the space. The RTU Open continues to operate in this mode until the space is satisfied or the outside air conditions are no longer suitable for free cooling.

The RTU Open may use either of 2 different

methods.

is used for heat pump applications and adjusts the effective setpoints to achieve the occupied setpoints by the time scheduled occupancy begins. This prevents or minimizes the need for auxiliary heat. The Optimal Start recovery period may begin as early as 4 hours prior to occupancy. The algorithm works by moving the unoccupied setpoints toward the occupied setpoints. The rate at which the setpoints move is based on the outside air temperature, design temperatures, and capacities.

The following conditions must be true for learning adaptive optimal start to operate:

• On the

page >

to 1 and must be set greater than

tab >

disables

) and less than or equal to 4.

, the default value is set

• The system is unoccupied

If the controller does not have a valid outside air temperature, then a constant of 65°F (18.3°C) is used.

This value is not adjustable.

The actual equation that the controller uses to calculate

is nonlinear. An

approximation of the result is shown below.

The values in the graph below are Fahrenheit.

To change

1 In the navigation tree, select the equipment that you want to change.

2 Click

page >

settings:

tab >

Page 27

Sequence of Operation

Temperature Compensated Optimal Start

Properties

Equipment

Configuration

Setpoints

Optimal Start

0 (0.00

Optimal Start

Properties

Equipment

Configuration

Setpoints

Heat Start K factor

Cool Start

K factor

Enthalpy control

Enthalpy

Status

High

Enthalpy Status

Low

Indoor Air CO2

switches from unoccupied to the occupied setpoints at a calculated time prior to occupancy. This minimizes the operation of the unit’s fan. The Optimal Start recovery period may begin as early as 4 hours prior to occupancy. The time at which the setpoints move is based on the difference between the current space temperature and the desired setpoint, multiplied by the "K" factor, or recovery rate, for the required mode of operation.

The following conditions must be true for Temperature Compensated Optimal Start to operate:

• On the

to 1 and must be set greater than

• The system is unoccupied

To change Temperature Compensated Optimal Start settings:

1 In the navigation tree, select the equipment that you want to change.

2 On the

. This defines the equipment’s recovery rate in minutes / deg.

You may use an enthalpy switch to indicate the suitability of outdoor air for economizer cooling. You can use either an outdoor air or differential enthalpy switch. A differential enthalpy switch has a sensing device in both the outdoor and return air streams. A differential enthalpy switch indicates when outside air is more suitable to be used than the return air and is available for economizer cooling. If no enthalpy switch is configured, a network point (Object Name: oae) is available. This point is displayed in the i-Vu® application and an Equipment Touch as

The sequence of operation for economizer cooling is the same with or without an enthalpy switch, except that an enthalpy switch imposes one more validation on the suitability of outside air for economizer cooling. An

met.

(BACnet).

that is

is a second start method used for gas or electric heating applications. It

page >

tab >

disables

) and less than or equal to 4.

, click

, the default value is set

disables the economizer and the outside air damper goes to its minimum position. An

enables the economizer if a call for cooling exists and the remaining preconditions are

installing an air quality (CO2) sensor. A CO2 sensor may be terminated at the RTU Open, or a subordinate zone controller, when part of a zoned system.

An outdoor air quality sensor may also be installed and terminated at the RTU Open, but it is not required. When an outdoor air quality sensor is not installed, the algorithm uses 400ppm as the fixed outdoor air CO2 level.

The following conditions must be true for the

• The system is occupied

• The supply fan has been started for at least 30 seconds

• The CO2 sensor has a valid reading

is controlled on rooftop equipment with an economizer.

algorithm to operate:

sequence is enabled by

Page 28

Sequence of Operation

Indoor Air CO2

Vent Dmpr Pos / DCV Min Pos

Indoor Air CO2

DCV

Max Vent Damper Pos

Heating

Reversing Valve

Outdoor Air Temperature

Heating Lockout Temperature

Supply Air Temperature

Space Temperature

Effective Occupied Heating Setpoint

Effective Unoccupied Heating Setpoint

Supply Air

Temperature

Maximum Heating SAT

Supply Air Temperature

Maximum Heating SAT

Heat Pump operation

HP O/B

Y1/W1

HP O/B

(B)

Y1/W1

As the air quality within the space changes, the minimum position of the economizer damper changes, which allows more or less outdoor air into the space, depending on the relationship of the indoor air CO2 level to the differential setpoint.

The position is then compared against the

algorithm calculates a minimum position value using a PID loop. The CO2 minimum damper

setpoint and the greatest value becomes the

final minimum damper position of the economizer output.

The degree to which the outside air damper may be opened by the

setpoint, which is adjustable between ten and sixty percent (10 – 60%).

algorithm is limited by the

The specific heating sequence is determined by the controller's application and configuration. The RTU Open controls up to two stages of gas or electric heating with an additional output for a applications).

The following conditions must be true for the heating algorithm to operate:

• The

is less than the

• The indoor fan has been ON for at least 30 seconds

setpoint

(Heat Pump

• The unit has a valid

• Neither Cool mode nor economizer are active and the time guard between modes has expired

The heating relays are controlled by the Heating Control PID Loop and Heating Stages Capacity algorithm, which calculate the desired number of stages to satisfy the space by comparing the

•

When the heating algorithm preconditions have been met, the heating is energized in stages. Anti-recycle timers are employed to protect the equipment from short-cycling. There are fixed one minute minimum on and off times for each heating output.

During heating operation, the RTU Open may reduce the number of active stages if the rooftop

exceeds the

again after the normal time-guard period has expired, if the

setpoint.

The RTU Open can control heat pumps

provides a separate output (BO-7) to control a reversing valve. The reversing valve control may be

configured to be energized with a call for heating

The sequence of operations are as previously described for heating and cooling except that the Y1 and are compressor outputs, energizing mechanical heating or cooling, depending on the state of the reversing valve.

and W2 are used for auxiliary heat. Up to two stages are available.

Selection sequences of operations are as described for Heating (page is not used in this application.

is for heat pumps that do not require a O terminal to energize the reversing valve. The

input

when occupied

when unoccupied

setpoint. A heat stage turned off in this fashion may be started

and

, or energized with a call for cooling (O).

has decreased below the

24) and Cooling (page 19). The reversing valve output

and W2 are used for auxiliary heat. Up to two stages are available.

to the:

outputs

Page 29

Sequence of Operation

Dehumidification

Outside Air Temperature

Cooling Lockout Temperature

Indoor Fan

Supply Air Temperature

Space Temperature

Space Relative Humidity Sensor

Humidistat

Demand Limiting

Demand Level Setpoints

Demand Level

Demand 1

Demand 2

Demand 3

Demand Limit

Level 0

Door switch

Door Contact

The RTU Open provides occupied and unoccupied dehumidification on units that are equipped with the Carrier Humidi-MiZer™ option from the factory. This requires a space relative humidity sensor or a humidistat for control.

The following conditions must be true for the dehumidification control to operate:

• The

has been on for at least 30 seconds

is greater than the

setpoint

• The unit has a valid

• Heat mode is not active and the time guard between modes has expired

When using a relative humidity sensor to control dehumidification, occupied and unoccupied dehumidification setpoints are used.

When using a humidistat, the setpoints are not used. The humidistat indicates a high-humidity condition.

When a high indoor relative humidity condition is indicated and the above conditions are satisfied, the RTU Open enters the dehumidification mode, energizing the Humidi-MiZer™ output.

The mode continues until the space relative humidity falls below the active setpoint by a 5% fixed Hysteresis when a humidity sensor is used, or when there is no longer a call for dehumidification where a humidistat is used.

See the base unit / Humidi-MiZer™ operations manual for additional information.

The RTU Open may employ a demand limit strategy. Demand limiting in the RTU Open works through setpoint expansion. The controller’s heating and cooling setpoints are expanded in steps or levels. The degree to which the setpoints are expanded is defined by the

Each yields a 1 (2.2

The BACnet leaves the standard occupied and unoccupied heating and cooling setpoints in effect. Levels 1 through 3 expands occupied heating and cooling setpoints.

°F (.5 °C) expansion,

°C) expansion.

input

(1 through 3) adjusts the heating and cooling setpoints outwards. By default,

yields a 2 °F (1.1 °C) expansion, and

variable sets the desired level of setpoint expansion in the receiving controller.

yields a 4 °F

A mounted within the space served by a single zone rooftop. The heating, when active (an open door or window is detected). Economizer cooling, if available, continues to operate. The input provides a configurable alarm delay (60 second default) before heating and cooling is disabled.

may be configured on any unused binary input. A typical application is a door or window contact

disables mechanical cooling and any

Page 30

Sequence of Operation

Remote Occupancy

Remote occupancy

Remote

Occupancy

Remote Occupancy

Occupancy Source

Remote Occ Input

Remote Occupancy

Fire Shutdown

Compressor Safety

Compressor Safety Alarm

Properties

Equipment

Alarms

Fan Status

may be configured on any unused binary input channel. A typical application is a remote

contact, controlled by a third party, or an occupancy sensor to set the controller's occupied mode. The

function requires both an input configured for

to operate.

Once configured, the controller will operate in the occupied or unoccupied mode, as determined by the state of the

shutdown contact, which, when active, immediately shuts down equipment operation.

may be configured on Binary Input 5. A typical application involves a smoke detector or fire

on most Carrier rooftop equipment.

A equipment requires attention.

Cooling, heating, and supply fan outputs are not interrupted except where the RTU Open is configured for Heat Pump operation. When configured for Heat Pump, and in the heating mode, a compressor safety fault will cause the available stages of electric heating to be enabled in place of mechanical heating.

Normal operation resumes when the compressor safety circuit is de-energized.

may be configured on Binary Input 3. A compressor safety tripped indicator circuit is available

input.

is shown on

page >

tab >

, and

and indicates that the

set to

switch, current sensing relay, or other device that provides a supply fan running verification.

Enabling this function displays the supply fan’s status on the equipment graphic.

If the controller loses fan status during operation, heating and cooling are disabled, the economizer damper (if available) is closed, and an alarm for loss of status is indicated.

If the fan status is on when the controller is commanding the fan off, the unit remains in the off state. An alarm is generated indicating that the fan is running when it should be off.

may be configured on any unused binary input channel. A typical application would be an airflow

Page 31

Sequence of Operation

Filter status

Filter

Dirty

Alarms

NOTE

Alarms

Properties

Equipment

Alarms

Safety Chain

Fire/Smoke Shutdown

Fire Shutdown

Gas Valve

Compressor Status

Space Temperature

Alarming Temperature

Space Temperature

Alarm Limit Exceeded

Space Temperature

SPT Sensor

Shutdown

Active

status may be configured on any unused binary input channel. A typical application is a differential pressure

switch that senses the pressure drop across a filter bank.

When the pressure across the filter bank exceeds the setpoint of the differential pressure switch, the is displayed as

on the controller graphic. An alarm indicates a dirty filter.

status

Some of the

tab >

not configured.

Examples: Low or High Temperature Cutouts (Freezestat / Firestat). This alarm indicates the safety chain circuit (Input 4) is open. Cooling, heating, and supply fan operation stop after appropriate time guards. Normal operation resumes when the safety chain circuit is complete.

Examples: Smoke detectors or fire shutdown relays. This alarm indicates this device (Input 5) has tripped. Cooling, heating, and supply fan operation immediately stop. Reset fire shutdown contact to resume normal operation.

– If configured for the IGC input function, the RTU Open will compare the state of this input with the requirement for heat (W1 or W2). If the IGC input, which detects an active flame in the gas heat section, is present 1 minute after any call for heating has ended, a gas valve failure alarm will occur, indicating a stuck gas valve.

alarm indicates the base unit's compressor safety circuit is energized. Cooling, heating, and supply fan outputs are not interrupted except when the RTU Open is configured for Heat Pump. Normal operation resumes when the compressor safety circuit is de-energized.

If the Heat Pump is a HP O/B Ctrl type and is in the heating mode, it will automatically replace the compressor stage(s) with the equivalent number of auxiliary heat stages, as available.

• If it's a Carrier Heat Pump HP Y1/W1 Ctrl, there is only 1 auxiliary heat stage output and the staging is done

by the machine itself. The RTU Open control does not take any action.

• For a non-Carrier Heat Pump, when configured for 2 stages of aux heat and two compressors, Compressor 1

is replaced by Aux Heat Stage 1 and Compressor 2 is replaced by Aux Heat Stage 2.

The compressor output stays on when the safety alarm is present. For cooling, the alarm indicates the compressors are not operating. See Heat Pump operation (page 24) for further information.

active (Alarm), displays additional values for the space temperature when the alarm condition occurred and the alarm limit exceeded.

The following values are related to the

•

occur and is only visible when the

•

temperature and is only visible when the

actively communicating. The alarm is reset when normal SPT sensor communications resume, if power is cycled to the controller, or if the

functions described in this section will only be visible on the

when the appropriate inputs are configured. Alarms are not initiated when the input is

page >

- You may use the RTU Open's safety chain circuit to shut down the unit for a safety condition.

- You may configure the RTU Open to accept a

contact on Input 5.

– You may configure the RTU Open to monitor the base unit’s compressor safety circuit. This

– This alarm indicates if the space temperature is outside the configured alarm limits. If

alarm:

– Displays the value of the space temperature that caused the alarm condition to

is in an alarm state.

– Displays the value of the alarm setpoint that was exceeded by the alarming

is in an alarm state.

– This alarm indicates a communication failure of a connected SPT sensor that previously had been

point is set to

Page 32

Sequence of Operation

ZS Sensor

Shutdown

Active

ZS Configuration

Space Temp Sensor

Supply Air Temperature

Supply Air Temp Sensor

Indoor Air Quality

Indoor Air Quality Sensor

Space Relative Humidity

Space Relative Humidity Sensor

Filter Filter

Input

Switch

Configuration

Unit Configuration

Filter Service Alarm Timer

Maintenance > Reset Filter Runtime Alarm

Off

Unit Configuration

Filter Service Alarm Timer

Local OAT Sensor

Outdoor Air Temp Sensor

Economizer Operation

Shutdown

Active

Economizer

Failed to Fully Open, Failed to Open, Failed to Close

Stuck Open

– This alarm indicates a communication failure of a connected ZS sensor that had previously been actively communicating. The alarm is reset when normal ZS sensor communications resume, if power is cycled to the controller, or if the

point is set to

– This alarm indicates that at least 1 ZS sensor is configured in the Sensor Binder properties and is not communicating. The alarm is reset when the configured ZS sensor is communicating or the configuration is changed to reflect the sensor is no longer connected to the Rnet.

– This alarm indicates an invalid sensor condition in a physically connected space temperature sensor (SPT Sensor/T5*). Cooling, heating, and supply fan operation stop after the appropriate time guards. Normal operation resumes when the controller detects a valid sensor.

– This alarm indicates that the supply air temperature is outside the configured alarm limits. The alarm is reset to normal when the supply air temperature returns within the configured alarm limits plus a 5

°F (2.7 °C) hysteresis. This alarm is inhibited until the fan has been running for 15 minutes to allow for

system stabilization after startup.

– This alarm indicates a shorted or open circuit in the SAT input. Cooling, heating, and supply fan operation stops after the appropriate time guards. Normal operation resumes when the controller detects a valid sensor.

– The RTU Open generates an

alarm if the CO2 level exceeds the configured

alarm limits. (This alarm is only shown when a valid indoor air quality sensor value is available).

– The RTU Open generates an

alarm if a valid sensor value is no longer available. For locally connected sensors, the mA input at the associated channel falls below 3.5 mA or rises above 21 mA. For network sensors, the controller is no longer receiving a value from the network. Cooling, heating, and supply fan continue to operate. However, the controller’s IAQ control function is disabled until the fault condition is corrected.

– The RTU Open generates a

alarm if the space humidity level exceeds the configured low or high alarm limits. (This alarm is only shown when a valid relative humidity sensor value is available).

– The RTU Open generates a

alarm if a valid sensor value is no longer available. For locally connected sensors, the mA input at the associated channel falls below 3.5 mA or rises above 21 mA. For network sensors, the controller is no longer receiving a value from the network. Cooling, heating, and supply fan operation continues, however, the controller’s Humidi-MiZer™ binary output is disabled until the fault condition is corrected.

– If the RTU Open is configured to monitor the filter through a hardware input switch contact, it generates a alarm if the associated input channel detects a dirty filter condition (opposite state of the

the accumulated runtime exceeds the

). Otherwise, if no hardware switch monitoring is used, the RTU Open generates a filter alarm when

value (when not set to 0).

“x”

This alarm is most commonly used to indicate a filter replacement is due. Reset the filter service runtime accumulator by setting the each setting. Set

value to 0 to disable the filter service alarm

to On, back to

, and clicking OK after

function.

– This alarm indicates a shorted or open circuit in the locally connected OAT input.

– This alarm indicates a valid OAT sensor value is no longer available. An alarm condition can occur from a failed locally connected sensor or if a network OAT value is no longer being received by the controller. Cooling, heating, and supply fan operation continues. OAT lockouts will not operate while the sensor is in alarm. Normal operation resumes when the controller detects a valid sensor.

24 Economizer FDD logic. Once detected, this alarm will stay active until the

– This alarm is active when an economizer fault is detected, as required by the CEC Title

input is set to

or the

fan is stopped.

above. Detected fault conditions include

– This point indicates the specific fault detected and announced by the Economizer Operation alarm

, and

Page 33

Sequence of Operation

Outdoor Air Quality Sensor

Setpoint Slider

Configuration

Unit Configuration

Input Configuration

Space Sensor Type

Unit Configuration

Setpoint Adjustment Range

Switch Configuration

Unit Configuration

Input

Functions 3, 5, 8,

Analog Input Configuration

Unit Configuration

Input Functions 1

Supply Fan Runtime

Unit

Configuration

Supply Fan Service Alarm Timer

Maintenance

Reset Supply Fan Runtime Alarm

Clear

Run

Unit Configuration

Supply Fan Service Timer

Compressor 1 Runtime

Unit

Configuration

Compressor 1 Service Alarm Timer

Compressor 1 Runtime

Maintenance

Reset Comp 1 Runtime Alarm

Clear

Run

Unit Configuration

Compressor 1 Service Timer

Compressor 1 Runtime

Compressor 2 Runtime

Unit

Configuration

Compressor 2 Service Alarm Time

Maintenance

Reset Comp 2 Runtime Alarm

Clear

Run

Unit Configuration

Compressor 2 Service Timer

Service

Configuration

Compressor States

Two Stages

Airside Linkage Alarm

Linkage

– The RTU Open generates an

alarm if the mA input at the associated channel falls below 3.5 mA or rises above 21 mA. For network sensors, the controller is no longer receiving a value from the network. Cooling, heating, and supply fan operation continues. However, the controller’s IAQ control function uses 400ppm as the fixed outdoor air CO

Open

– The RTU Open generates this alarm when an open circuit is detected at Input 11 and the RTU

level until the fault condition is corrected.

is set to T56. Note that only an open circuit results in an alarm. A short across this input offsets the setpoints negatively by the amount configured in the

- The RTU Open generates this alarm when any two of the

or 9 are configured identically. Neither input may work reliably and downstream control may be affected, depending on the function duplicated. The alarm clears and normal control is restored when the input function duplication is corrected.

and

are configured identically. Neither input may work reliably and downstream control may be affected,

- The RTU Open generates this alarm when the

depending on the function duplicated. The alarm clears and normal control is restored when the input function duplication is corrected.

- The RTU Open generates a this alarm when the accumulated runtime exceeds the

value (when not set to 0). This alarm is most commonly used to indicate an equipment maintenance interval is due. The supply fan runtime accumulator may be reset by setting the selection by clicking the to

disables the supply fan runtime alarm function.

to indicate an equipment maintenance interval is due. The setting the selection by clicking the value to

button when it appears. Setting

- The RTU Open generates this alarm when the accumulated runtime exceeds the

disables the

button when it appears. Setting

- The RTU Open generates this alarm when the accumulated runtime exceeds the

, and then back to

– acknowledging each

value (when not set to 0). This alarm is most commonly used

, and then back to

accumulator may be reset by

– acknowledging each

alarm function.

r value (when not set to 0). This alarm is most commonly used

value

to indicate an equipment maintenance interval is due. The Compressor 2 runtime accumulator may be reset by setting the selection by clicking the value to

disables the Compressor 2 runtime alarm function. Note that this function is unavailable if the

button when it appears. Setting

value is not set to

, and then back to

– acknowledging each

- An RTU Open may act as an air source in a zoned system. Carrier systems use a function called Linkage™ to pass data between a master zone and its air source over an MS/TP network connection. When the RTU Open is part of a linked system, it will indicate an airside linkage alarm if it loses communications with its linkage master or if it receives data from more than 1 master zone.

The RTU Open may serve as an air source to an Open Variable Volume Terminal (VVT) system. When the RTU Open is part of a VVT system and the controllers are wired together to form a network, the controllers may use a method of communication known as Linkage™. Linkage is a method by which an air source and its subordinate zone terminals exchange data to form a coordinated HVAC system. The system's air source controller, zone controllers, and bypass controller are linked so that their data exchange can be managed by one zone controller configured as the VVT Master.

Page 34

Sequence of Operation

NOTE

Linkage Callers

The VVT Master gathers the following information from the slave zone controllers:

• occupancy status

• setpoints

• zone temperature

• relative humidity

• CO

level

• damper position

• optimal start data

The VVT Master performs mathematical calculations and algorithms on the data and then sends the composite information to the air source. The VVT Master receives information from the air source such as System Mode, Supply Air Temperature, and Outside Air Temperature (if available), and passes that information to all linked controllers.

The following paragraphs describe the interaction between the air source (RTU Open) and its subordinate zones. Additional information regarding Open Zoned Systems may be found in the VVT Zone and VVT Bypass Controller Installation Guides.

The VVT Master determines system operation by prioritizing heating and cooling requirements from all the zones based on their occupancy and demand. The VVT Master scans the system continuously to determine if any zones are occupied. Occupied zones are a higher priority than unoccupied zones. The VVT Master evaluates all the occupied zones' heating or cooling demands and sends a request to the air source (RTU Open) for:

• Cooling, if the number of occupied zones with cooling demands exceeds the number of occupied zones with

heating demands, and the demand is greater than or equal to the number of configured

• Heating, if the number of occupied zones with a heating demand exceeds or is equal to the number of

If no zones are occupied or no occupied zones require heating or cooling, the VVT Master performs the evaluation described above for the unoccupied zones.

The VVT Master then gathers the following information and sends it to the air source (RTU Open):

• The setpoints and zone temperature from the zone with the greatest demand for the requested air source

mode (heating or cooling). (This zone is called the reference zone.)

• The system occupancy status

• Most open damper position from any zone

• RH and CO2 values (if applicable)

The air source responds by sending the air source mode, supply air temperature, and outside air temperature. The air source verifies the mode by comparing its supply air temperature to the space temperature received through Linkage. See the air source documentation for operation and parameters used to verify its mode. This verification allows the VVT system to determine if the desired air source mode is actually being provided. For example, if the VVT Master sends a request for heating and the air source does not have heat or it’s heat has failed, the air source's actual mode indicates that and it's current mode is sent to the zones so that they can control accordingly.

The system remains in that mode until all zones of that demand are satisfied or until the system mode reselect timer (default 30 minutes) causes a forced re-evaluation of the system. If there is no demand for the opposite mode, the reselect timer starts again and the current mode continues until all zones are satisfied or until the reselect timer expires, repeating the process. If there is a demand for the opposite mode, the VVT Master sends the reference zone's space temperature and setpoints to the air source and restarts the reselect timer. The air source re-evaluates its demand based on the new information and goes to the Vent mode until the new mode can be verified as described above. The amount of time this takes is determined by the air source’s operating parameters.

The VVT Master continuously evaluates the system and updates the air source with the most current system demand. Based on the evaluation, the reference zone can change from one zone to another. The evaluation process continues until there is no demand from any zone or the system mode reselect timer causes a reevaluation of the system conditions.

Page 35

Sequence of Operation

Air source mode determination

Linked air source modes

OFF

WARMUP

HEAT

FREECOOL

COOL

PRESSURIZATION

EVACUATION/SHUTDOWN

VENT

If no heating or cooling is required or the current air source mode is satisfied, the VVT Master calculates the weighted average of the occupied and unoccupied heating and cooling setpoints. It also calculates a zone temperature that is midway between the setpoints (occupied or unoccupied based on the system’s current occupancy status). This information, plus the occupancy status, is sent to the air source so that its current mode is disabled and the unit ceases heating or cooling operation. If the system is occupied, the air source fan and OA damper, if applicable, operate to maintain proper ventilation.

– In a linked system, the air source determines its operating mode and qualifies that mode based on its own SAT and the referenced zone's temperature. The following modes can be sent by the air source depending on its configuration:

•

– Air source fan is off.

•

– Air source fan is on and providing first cycle of heat when changing from unoccupied to occupied.

– Air source fan is on and providing heat.

– Air source fan is on and providing cooling using economizer only.

– Air source fan is on, and cooling is provided by economizer and mechanical cooling.

– Fire-Life safety override input is active. Air source fan is on providing 100 percent

outside air. Mechanical heating and cooling may be disabled.

•

– Air source fan is on, economizer providing ventilation without heating or cooling, providing neutral

– Fire-Life safety override input is active. Air source fan is off.

supply air temperature.

See the air source’s Installation manual for specific operation.

Page 36

Troubleshooting

LED's

If this LED is on...

Status is...

Power

The RTU Open has power

The RTU Open is receiving data from the network segment

The RTU Open is transmitting data over the network segment

BO#

The binary output is active

NOTE

Run

Error

If Run LED shows...

And Error LED shows...

Status is..

2 flashes per second

Off

Normal

2 flashes per second

2 flashes,

Run

Five minute auto-restart delay after

Troubleshooting

The RTU Open controller acts as an intelligent embedded thermostat to the rooftop unit, but can be monitored and controlled from a third party network. For this reason, there are 3 distinct components for troubleshooting.

The three parts to the system are:

• The mechanical systems of the rooftop unit

• The RTU Open controller

• The third party network connected

Determining which component needs troubleshooting is the first step.

The RTU Open controller can be used to troubleshoot itself with service test, communicating LED’s, and built-in alarms, which are discussed in the unit Controls and Troubleshooting instructions. Disconnecting the RTU Open from the unit control inputs can be valuable in determining whether the problem is related to the unit/equipment, the controller/equipment, or the controller/network. Generally, this should be the first step in troubleshooting operational problems. When disconnected from the unit control inputs, simple 24V signals can be used to activate the units G, Y1, Y2, W1, W2, etc. and verify proper unit operation. If the problem occurs without the RTU Open connected, then the operator should begin troubleshooting the unit/equipment rather than the RTU Open or network.

Third party network may also help in troubleshooting the controller and rooftop unit. Third party network troubleshooting may also be required.

The LED’s indicate if the controller is speaking to the other devices on the network. The LED’s should reflect communication traffic based on the baud rate set. The higher the baud rate, the more solid the LED’s will appear.

The LED's on the RTU Open show the status of certain functions.

If Tx is not lit, the MS/TP token is not being passed between controllers.

The

and

LED's indicate controller and network status.

alternating with

LED

system error

Page 37

Troubleshooting

If Run LED shows...

And Error LED shows...

Status is..

2 flashes per second

3 flashes, then off

Controller has just been formatted

2 flashes per second

Two or more devices on this network

2 flashes per second

Firmware halted after frequent 5 flashes per second

Off

Firmware transfer in progress, Boot is

7 flashes per second

7 flashes per second,

Run

Ten second recovery period after

14 flashes per second

14 flashes per second, alternating with

Run

Brownout

Failure. Try the following solutions:

Replace the RTU Open.

alternating with

LED

have the same network address

system errors or control programs halted

running

brownout

• Turn the RTU Open off, then on.

•

Page 38

Compliance

FCC Compliance

CAUTION

CE Compliance

WARNING

BACnet Compliance

Compliance

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

void the user’s authority to operate the equipment.

Changes or modifications not expressly approved by the responsible party for compliance could

This is a Class A product. In a domestic environment, this product may cause radio interference

in which case the user may be required to take adequate measures.

BACnet® is a registered trademark of ASHRAE. ASHRAE does not endorse, approve or test products for compliance with ASHRAE standards. Compliance of listed products to requirements of ASHRAE Standard 135 is the responsibility of BACnet International. BTL

is a registered trademark of BACnet International.

Page 39

Appendix A: Network Points List for RTU Open

Network points list for BACnet and Modbus

BACnet

Modbus

Point Name

Point

Units

Default

BACnet Point Name

BACnet Object

Modbus Register Type

Modbus

Active Heat

Effective Cool

High Space

0=Normal

Low Space

0=Normal Input_6

°F ai_6

AI:1006

Supply Fan Relay

0=Off

Economizer

Outdoor Air

0=Normal

DCV Max Vent

Holding Register

Space HP Rev Cycle

Holding Register

System Outdoor

Holding Register

Economizer Purge

Holding Register

Active

1=Off

12=Pre-occ Purge

Appendix A: Network Points List for RTU Open

Stages

Setpoint

Temperature

State

Supply Fan Status R

Output

Quality Sensor

Damper Pos

Temperature Prime Variable

Lockout Temp

Air Temperature

Min Pos

Access

R heat_run AV:2003 Input Register (Float) 33

R °F eff_cl_stpt AV:3005 Input Register (Float) 55

R %Open econ_output AV:2022 Input Register (Float) 51

R/W %Open 50 iaq_dpr_max AV:9011

R °F space_temp AV:2007 Input Register (Float) 107

R/W °F -3 hp_rev_cycle_lockout AV:9004

R/W °F -999 system_oat AV:1901

R/W %Open 40 econ_purge_min AV:9029

1=Alarm

1=On

1=Alarm

Value

spt_hi_alarm BV:7011 Discrete Input 35

spt_lo_alarm BV:7012 Discrete Input 39

sfan BV:2001 Discrete Input 23

sfan_status BV:1003 Discrete Input 24

oaq_fail BV:7006 Discrete Input 41

(Float)

119

Compressor Stages

System Mode R

R comp_run AV:2020 Input Register (Float) 31

2=Fan Only 3=Economizer Cooling 4=Cooling 5=Heating 6=Dehumidificati on 7=Test 8=Shutdown 9=Unocc Free Cooling 10=Fire Shutdown 11=IAQ Override

run_status MSV:2002

Input Register (Signed)

Page 40

Appendix A: Network Points List for RTU Open

BACnet

Modbus

Point Name

Point

Units

Default

BACnet Point Name

BACnet Object

Modbus Register Type

Modbus 13=IGC Override

Supply Air

DCV Max Ctrl

Holding Register

Occ Relative

Holding Register

0=Unoccupied 1=Occupied

1=None

Holding Register Economizer Test

R/W

%Open

econ_test

AV:81001

Space Relative

0=Normal

Setpoint

Effective Heat Setpoint

Low Fan Econ Min

Holding Register

Fire / Smoke

0=Normal

0=Off

Holding Register

ZS Sensor

0=Normal

Space Relative

Outdoor Air

Cooling Lockout

Holding Register

Power Exhaust

Holding Register

1=Inactive Holding Register

Holding Register

Compressor

0=Normal

Filter Service Alarm Timer

Holding Register (Float)

Indoor Air Quality

0=Normal

Heating Lockout

Holding Register Dehumidification

0=Inactive

dehum

BV:2006

Discrete Input

Temperature

Setpoint

Humidity Setpoint

Occupancy Status R

Optimal Start Type

Access

R °F sa_temp AV:1008 Input Register (Float) 109

R/W ppm 650 iaq_stpt_max AV:3013

R/W %rh 60 occ_dehum_stpt AV:3011

2=Temp

R/W

Compensated 3=Learning Adaptive

Value

occ_status BV:2008 Discrete Input 18

2 start_type MSV:2009

Setpoint R/W °F unocc_ht_stpt AV:3004

Humidity Sensor

Adjustment

1=Alarm

R °F stpt_adj AV:1006 Input Register (Float) 99

sprh_sensor_fail BV:7022 Discrete Input 45

R °F eff_ht_stpt AV:3006 Input Register (Float) 57

Pos

Shutdown

Reset Filter Alarm R/W

R/W %Open 33 econ_min_2 AV:9030

1=Alarm

1=On

fire_alarm BV:7007 Discrete Input 32

Inactive (0) filter_rntm_clr BV:7517 Coil 22

Setpoint R/W °F unocc_cl_stpt AV:3003

Configuration

Humidity

Temperature

Setpoint

R %rh space_rh AV:1011 Input Register (Float) 103

R °F oa_temp AV:1003 Input Register (Float) 87

R/W °F 45 oat_cl_lockout AV:9002

R/W %Open 50 pexh_stpt AV:3010

BAS On / Off R/W

1=Alarm

2=Occupied 3=Unoccupied

zs_config_fail BV:7055 Discrete Input 63

1 keypad_ovrde MSV:1001

System Space AQ R/W ppm -999 system_iaq AV:1903

System Space RH R/W % -999 system_rh AV:1904

Status

1=Alarm

comp_alarm BV:7013 Discrete Input 30

R/W hr 600 filter_service_hrs AV:2019

(Float)

Holding Register (Signed)

(Float)

Holding Register (Signed)

(Float)

154

133

149

151

Sensor

Temperature

1=Alarm

R/W °F 65 oat_ht_lockout AV:9003

iaq_sensor_fail BV:7039 Discrete Input 37

(Float)

Page 41

Appendix A: Network Points List for RTU Open

BACnet

Modbus

Point Name

Point

Units

Default

BACnet Point Name

BACnet Object

Modbus Register Type

Modbus 1=Active

Reversing Valve

0=Off

Password Vent Dmpr Pos /

Holding Register

0=Clean

0=Normal

Unocc Relative

Holding Register

Holding Register (Float)

Supply Air Temp

0=Normal

Override Time

Setpoint

0=Disable

System Space

Holding Register

Space System Outdoor

Holding Register

Outdoor Air Temp

0=Normal

1=Off

5=On

Setpoint

Holding Register

0=High

Holding Register (Float)

System Cooling

System Heating

System OAT

T5x Override VFD Speed Test

R/W % 0

vfd_spd_test

AV:81002

0=Off

Relay State

Protected Output Variable

DCV Min Pos

Filter R

Safety Chain R

Humidity Setpoint

Access

1=On

R/W 0 ppo AV:90000

R/W %Open 20 econ_min AV:9005

1=Dirty

1=Alarm

R/W %rh 95 unocc_dehum_stpt AV:3012

Value

aux_1 BV:2007 Discrete Input 20

filter_alarm BV:7017 Discrete Input 31

safety_alarm BV:7024 Discrete Input 43

Setpoint R/W °F occ_ht_stpt AV:3002

Sensor

Remaining

Adjustment

Temperature

Temperature Offset Pot

Sensor

SPT Sensor R

1=Alarm

R min ovrde_time AV:2016 Input Register (Float) 93

R/W

1=Enable

R/W °F -999 system_spt AV:1902

R °F stpt_adj_offset AV:91006

R/W ppm -999 system_oaq AV:1908

1=Alarm

loc_sat_sensor_fail BV:7020 Discrete Input 51

Active (1) stpt_adj_enable BV:1013 Coil 26

oat_fail BV:7029 Discrete Input 27

spt_sensor_fail BV:7032 Discrete Input 38

(Float)

131

129

123

155

2=Low

Fan / Speed R

3=Med

fan_run MSV:2004

4=High

Adjustment Range

Enthalpy (BACnet) R/W

R/W °^F 5 stpt_adj_range AV:9015

1=Low

Active (1) oae BV:1901 Coil 6

Optimal Start R/W hr 1 optm_start AV:9026

Demand Level

Master

Duration

input_3 R

input_4 R

R cool_demand_level AV:9006

R heat_demand_level AV:9036

R °F mstr_oa_temp AV:80001

R/W hr 1 ovr_dur AV:9023

1=On

di_3 BI:1003

di_4 BI:1004

Input Register (Signed)

(Float)

175

101

147

Page 42

Appendix A: Network Points List for RTU Open

BACnet

Modbus

Point Name

Point

Units

Default

BACnet Point Name

BACnet Object

Modbus Register Type

Modbus

0=Off

0=Normal

Analog Input

0=Normal

Compressor 1

0=Normal

Compressor 1

0=Off

Compressor 1

0=Disable

Compressor 2

0=Off

Compressor 2

0=Normal

Compressor 2 Test

0=Disable 1=Enable

Compressor

0=Normal

Continuous

0=No DCV Control

R/W Inactive (0)

dcv_enable

BV:1027

Dehumidification

0=Disable

Door Contact

0=Off

0=No

0=High

0=Off 1=On

Factory Test Relay

0=Off

Factory Test Relay

0=Off

Factory Test Relay

0=Off

Factory Test Relay

0=Off

Factory Test Relay

0=Off

Factory Test Relay

0=Off

Factory Test Relay

0=Off

Factory Test Relay

0=Off

0=Clean Fire Shutdown

0=Run Enabled

firedown_status

BV:1005

input_5 R

input_8 R

input_9 R

Airside Linkage R

Configuration

Runtime

Relay State

Test

Relay State

Runtime

Safety Status

Occupied Exhaust

Access

R/W

1=On

1=Alarm

1=On

1=Enable

1=On

1=Alarm

1=Trouble

1=Yes

Value

di_5 BI:1005

di_8 BI:1008

di_9 BI:1009

air_linkage_fail BV:7030

ai_cfg_alarm BV:7026

comp1_rntm_alarm BV:7014

comp_1 BV:2005

Inactive (0) comp1_test BV:81005

comp_2 BV:2004

comp2_rntm_alarm BV:7015

Inactive (0) comp2_test BV:81004

comp_status BV:1008

Inactive (0) occ_exh BV:9002

Test

Status

R/W

Economizer Exists R/W

Enthalpy Status R

Factory Test R/W

1 Control

2 Control

3 Control

4 Control

5 Control

6 Control

7 Control

8 Control

R/W

Filter Status R

1=Enable

1=On

1=Yes

1=Low

1=On

1=Dirty

Inactive (0) dehum_test BV:81006

door_contact_status BV:1010

Inactive (0) econ_exist BV:99001

enthalpy_status BV:1002

Inactive (0) fac_test_enable BV:91000

Inactive (0) relay1_fac_test BV:91001

Inactive (0) relay2_fac_test BV:91002

Inactive (0) relay3_fac_test BV:91003

Inactive (0) relay4_fac_test BV:91004

Inactive (0) relay5_fac_test BV:91005

Inactive (0) relay6_fac_test BV:91006

Inactive (0) relay7_fac_test BV:91007

Inactive (0) relay8_fac_test BV:91008

filter_status BV:1004

Page 43

Appendix A: Network Points List for RTU Open

BACnet

Modbus

Point Name

Point

Units

Default

BACnet Point Name

BACnet Object

Modbus Register Type

Modbus Status

1=Shutdown

0=Disable

Heat Stage 1

0=Off

Heat Stage 2 Relay State

0=Off 1=On

0=Electric

High Speed Fan

0=Disable

Humidistat Input Status

0=High 1=Low

0=Off

0=Normal

Occupancy

0=Off

Power Exhaust

0=Off

Power Exhaust

0=Disable

Reset Comp 1

0=Run

Reset Comp 2

0=Run

Reset Supply Fan

0=Run

Reversing Valve RH Control

R/W Inactive (0)

rh_enable

BV:1025

Safety Chain

0=Off

0=Unoccupied

0=Disable

0=Normal

0=Inactive

Supply Fan

0=Normal

Supply Fan in

0=Normal

Supply Fan

0=Normal

Switch Configuration

0=Normal 1=Alarm

System is shut

0=No

0=Disable

Access

Heat 1Test R/W

Heat 2Test R/W

Relay State

Heat Type R/W

Test

R/W

IGC Override R

Local OAT Sensor R

Contact

Relay State

Test

Runtime Alarm

Output

R/W

R/W Inactive (0) rev_vlv_type BV:1026

1=Enable

1=On

1=Gas

1=Enable

1=Active

1=Alarm

1=On

1=Enable

1=Clear

Value

Inactive (0) heat1_test BV:81003

Inactive (0) heat2_test BV:81002

heat_1 BV:2003

heat_2 BV:2002

Inactive (0) heat_type BV:99002

Inactive (0) hi_spd_test BV:81010

humstat_status BV:1006

igcovr_status BV:1022

loc_oat_sensor_fail BV:7003

occ_contact_status BV:1007

pexh BV:2010

Inactive (0) pexh_test BV:81008

Inactive (0) comp1_rntm_clr BV:7514

Inactive (0) comp2_rntm_clr BV:7515

Inactive (0) sfan_rntm_clr BV:7510

Feedback

Schedule R/W

Service Test R/W

Setpoint Slider R

Shutdown R/W

Failure

Hand

Runtime

down

Unocc Free Cool R/W

1=On

1=Occupied

1=Enable

1=Alarm

1=Active

1=Alarm

1=Yes

1=Enable

safety_status BV:1009

0 schedule BV:8000

Inactive (0) test_enable BV:81000

slidepot_alarm BV:7002

Inactive (0) shutdown BV:9001

sfan_fail_alarm BV:7008

sfan_hand_alarm BV:7009

sfan_rntm_alarm BV:7010

di_cfg_alarm BV:7025

shutdown_status BV:2011

Inactive (0) ntfc_ena BV:80001

Page 44

Appendix A: Network Points List for RTU Open

BACnet

Modbus

Point Name

Point

Units

Default

BACnet Point Name

BACnet Object

Modbus Register Type

Modbus

1=Off

Compressor

1=One Stage

1=Disabled

1=Single Speed 1=Auto

1=No Sensor

1=No Function

Input 3 Switch

1=NO

1=No Function

Input 5 Switch

1=NO

1=No Function

Input 8 Switch

1=NO

1=No Function 2=HumidiStat

Access

Air Source Mode R

Stages

R/W

Equipment Status R

Fan Control R/W

Fan Mode R/W

Input 1 Function R/W

Input 2 Function R/W

2=Warmup 3=Heating 4=Cooling 5=Freecool 6=Pressure 7=Evac 8=Vent

2=Two Stages

2=Test 3=Run

2=Two Speed 3=Variable Speed

2=Continuous 3=Always On

2=IAQ Sensor 3=OAQ Sensor 4=Space RH Sensor

Value

link_ahu_mode MSV:2005

2 comp_stages MSV:91003

mode_status MSV:2001

3 fan_type MSV:9031

2 fan_mode MSV:9032

1 ai1_function MSV:81001

1 ai2_function MSV:81002

Input 3 Function R/W

Configuration

R/W

Input 5 Function R/W

Configuration

R/W

Input 8 Function R/W

Configuration

R/W

Input 9 Function R/W

2=Compressory Safety 3=Fan Status 4=Filter Status 5=Remote Occupancy 6=Door Contact

2=NC

2=Fire Shutdown 3=Fan Status 4=Filter Status 5=Remote Occupancy 6=Door Contact

2=NC

2=Enthalpy Switch 3=Fan Status 4=Filter Status 5=Remote Occupancy 6=Door Contact

2=NC

2 di3_function MSV:81003

1 di3_type MSV:81013

2 di5_function MSV:81005

1 di5_type MSV:81015

2 di8_function MSV:81008

1 di8_type MSV:81018

2 di9_function MSV:81009

Page 45

Appendix A: Network Points List for RTU Open

BACnet

Modbus

Point Name

Point

Units

Default

BACnet Point Name

BACnet Object

Modbus Register Type

Modbus

3=Fan Status

Input 9 Switch

1=NO

1=1

3=0

1=Always

Input

1=T55

1=Sensor Failure 1=Heat / Cool

0=Normal

Economizer

0=Normal

Space zone_temp_zone_

zone_temp_override_ input_10

°F ai_10

AI:1010

Factory Test

Economizer High Maximum Heating

Compressor 2

Linkage Max

Air Source Supply Max VFD Output

R/W % 100

max_vfd_spd

AV:3026

Dehum Min VFD

R/W % 100

dehum_min_vfd

AV:3028

Access

Configuration

Number Of Heat Stages

Occupancy Source

R/W

Space sensor type R/W

Space Temp Source

4=Filter Status 5=Remote Occupancy 6=Door Contact

2=NC

2=2

Occupied 2=BACnet Schedule 3=BAS On/Off 4=Remote Occ

2=T56 3=SPT Sensor 4=None

2=SPT Sensor 3=T55 / T56 4=Network 5=Airside Linkage 6=Locked Value

Value

1 di9_type MSV:81019

2 heat_stages MSV:91004

1 occ_source MSV:1002

1 spt_type MSV:9001

spt_status MSV:2003

2=LC

Unit Type R/W

WeatherExpert 3=HP O/B Ctrl

ZS Temp Sensor R

Operation

Temperature Alarm Status

4=HP Y1/W1 Ctrl

1=Alarm

1=Fault Detected

0=Normal 1=Alarm

SPT Sensor R °F

SPT Sensor R min

Analog 1 Control

OAT Lockout Temp

SAT

Runtime

Damper Position

Air Temp

R/W % 0 ao1_fac_test AV:91001

R/W °F 75 oat_ec_lockout AV:9008

R/W °F 120 sat_ht_max AV:83004

R hr comp2_rntm AV:2018

R % link_max_dmpr AV:2611

R °F link_sat AV:2608

2 unit_type MSV:9018

zst_sensor_fail BV:7051

econ_opr BV:7054

spt_alrm_status BV:7056

temp

time_remaining

AI:1

AV:1

Page 46

Appendix A: Network Points List for RTU Open

BACnet

Modbus

Point Name

Point

Units

Default

BACnet Point Name

BACnet Object

Modbus Register Type

Modbus Output

Air Source Stage 3 SAT Stpt

R/W

°F

stg_3_sat

AV:83010

Stage 1 SAT Stpt

R/W

°F

stg_1_sat

AV:83008

HP Aux Heat input_1

ai_1

AI:1001

Factory Test

Compressor 2

Compressor 1 Compressor 1 Min VFD Output

R/W % 40

min_vfd_spd

AV:3027

Stage 2 SAT Stpt

R/W

°F

stg_2_sat

AV:83009

slidepot voltage Filter Runtime

hr filter_rntm

AV:2015

Fan Off Delay

R/W

seconds

fan_delay_off

AV:9024

input_7

°F ai_7

AI:1007

input_11

ai_11

AI:1011

input_2

ai_2

AI:1002

Minimum Cooling

Power Fail Restart

Holding Register

Supply Fan Supply Fan

Indoor Air Quality CO2 (ppm)

Supply Fan VFD

R %

vfd_output

AV:2027

0=Normal

Supply Air

0=Normal

Space Relative

0=Normal

Space Temp

0=Normal

Outdoor Air

0=Normal

Holding Register

Outdoor Air Temp

Lockout Temp

Analog 2 Control

Service Alarm Timer

Runtime

reading

Access

Value

R °F link_ahu_oat AV:2609

R/W °F 40 oat_auxht_lockout AV:3025

R/W V 0 ao2_fac_test AV:91002

R/W hr 0 comp2_service_hrs AV:83007

R/W hr 0 comp1_service_hrs AV:83006

R hr comp1_rntm AV:2017

R slidepot_volts AI:1012

SAT

Delay

Service Alarm Timer

Runtime

R/W °F 50 sat_cl_min AV:83003

R/W seconds 5 start_delay AV:9007

R/W hr 0 sfan_service_hrs AV:83005

R hr sfan_rntm AV:2014

R ppm iaq AV:1009 Input Register (Float) 73

Indoor Air Quality R

Temperature

Humidity

Sensor

Quality CO2 (ppm)

Gas Valve R

1=Alarm

R ppm oaq AV:1012 Input Register (Float) 85

1=Alarm

iaq_alarm BV:7005 Discrete Input 33

sat_alarm BV:7004 Discrete Input 47

sprh_hi_alarm BV:7018 Discrete Input 34

spt_fail BV:7001 Discrete Input 46

igc_alarm BV:7050 Discrete Input 40

Setpoint R/W °F occ_cl_stpt AV:3001

(Float)

127

Page 47

Appendix A: Network Points List for RTU Open

Network points list for N2 and LonWorks

N2 Lonworks

Point Name

Point

Units

Default

N2 Network

SNVT Type

SNVT Name

Active Heat Stages

ADF

SNVT_count_inc(9)

nvoHtStgs

Effective Cool Setpoint

°F ADF

SNVT_temp_p(105)

nvoEffCoolSP

0=Normal

0=Normal 1=Alarm

0=Off

0=Off Economizer Output

%Open

ADF

SNVT_lev_percent(81)

nvoEconOut

Outdoor Air Quality

0=Normal

DCV Max Vent Damper

Space Temperature -

HP Rev Cycle Lockout

System Outdoor Air

Economizer Purge Min

Active Compressor

1=Off

occ Purge

Supply Air Temperature

°F ADF

SNVT_temp_p(105)

nvoSAT

DCV Max Ctrl Setpoint

R/W

ppm

650

ADF

SNVT_ppm(29)

nviDCVMaxPPM

Occ Relative Humidity

0=Unoccupied

1=None

Setpoint

R/W

°F ADF 8 SNVT_temp_p(105)

nviUnoccHtSP

Space Relative Humidity

0=Normal

SNVT_switch(95)

nvoSpRHSenr

High Space Temperature R

Low Space Temperature R

Supply Fan Relay State R

Supply Fan Status R

Sensor

Pos

Prime Variable

Temp

Temperature

Pos

Stages

Access

1=Alarm

1=On

R/W %Open 50 ADF 18 SNVT_lev_percent(81) nviDCVMaxPos

R °F ADF 48 SNVT_temp_p(105) nvoSpaceTemp

R/W °F -3 ADF 30 SNVT_temp_p(105) nviHPRvClLk

R/W °F -999 ADF 54 SNVT_temp_p(105) nviSysOAT

R/W %Open 40 ADF 5 SNVT_lev_percent(81) nvoEcnPrgMin

R ADF 10 SNVT_count_inc(9) nvoCmpStages

1=Alarm

Value

BI 35 SNVT_switch(95) nvoHiSpTemp

BI 39 SNVT_switch(95) nvoLoSpTmp

BI 23

BI 24 SNVT_switch(95) nvoFanStatus

BI 41 SNVT_switch(95) nvoOAQSensor

Point Type

Network Point Address

2=Fan Only 3=Economizer Cooling 4=Cooling 5=Heating 6=Dehumidification

System Mode R

Setpoint

Occupancy Status R

Optimal Start Type R/W

R/W %rh 60 ADF 36 SNVT_lev_percent(81) nviOcRHSP

7=Test 8=Shutdown 9=Unocc Free Cooling 10=Fire Shutdown 11=IAQ Override 12=Pre13=IGC Override

1=Occupied

2=Temp Compensated 3=Learning Adaptive

ADI 13 SNVT_count_inc(9) nvoOpMode

BI 18 SNVT_switch(95) nvoOccStatus

2 ADI 20 SNVT_count_inc(9) nviOptStType

Page 48

Appendix A: Network Points List for RTU Open

N2 Lonworks

Point Name

Point

Units

Default

N2 Network

SNVT Type

SNVT Name

Sensor

1=Alarm

Setpoint Adjustment

°F ADF

SNVT_temp_p(105)

nvoSPAdjust

Effective Heat Setpoint

°F ADF

SNVT_temp_p(105)

nvoEffHeatSP

Low Fan Econ Min Pos

R/W

%Open

ADF

SNVT_lev_percent(81)

nviLwFnEcnMn

0=Normal

0=Off

Inactive Setpoint

R/W

°F ADF 7 SNVT_temp_p(105)

nviUnoccClSP

0=Normal Space Relative Humidity

%rh ADF

SNVT_lev_percent(81)

nvoSpaceRH

Outdoor Air Temperature

°F ADF

SNVT_temp_p(105)

nvoOAT

Cooling Lockout Power Exhaust Setpoint

R/W

%Open

ADF

SNVT_lev_percent(81)

nviPwrExhSP

1=Inactive

System Space AQ

R/W

ppm

-999

ADF

SNVT_count_inc(9)

nviSysSpAQ

System Space RH

R/W % -999

ADF

SNVT_lev_percent(81)

nviSysSpRH

0=Normal

Filter Service Alarm

0=Normal

Heating Lockout

0=Inactive

Reversing Valve Relay

0=Off

Vent Dmpr Pos / DCV

0=Clean

0=Normal

Unocc Relative Humidity Setpoint

R/W

°F ADF 9 SNVT_temp_p(105)

nviOccHeatSP

0=Normal

Override Time

0=Disable

Active

System Space System Outdoor AQ

R/W

ppm

-999

ADF

Outdoor Air Temp

0=Normal

Access

Fire / Smoke Shutdown R

Reset Filter Alarm R/W

ZS Sensor Configuration R

Temperature

R/W °F 45 ADF 16 SNVT_temp_p(105) nviClLckTemp

BAS On / Off R/W

Compressor Status R

Timer

R/W hr 600 ADF 28 SNVT_count_inc(9) nviFltAlmTm

Indoor Air Quality Sensor R

Temperature

R/W °F 65 ADF 29 SNVT_temp_p(105) nviHtLckTmp

Dehumidification R

State

Min Pos

R/W %Open 20 ADF 60 SNVT_lev_percent(81) nviDCVMinPos

Filter R

Safety Chain R

Setpoint

R/W %rh 95 ADF 59 SNVT_lev_percent(81) nviUnoccRHSP

1=Alarm

1=On

1=Alarm

2=Occupied 3=Unoccupied

1=Alarm

1=Active

1=On

1=Dirty

1=Alarm

Value

Point Type

Network Point Address

BI 32 SNVT_switch(95) nvoFrShtdwn

(0)

BO 22 SNVT_switch(95) nviRstFilAlm

BI 63 SNVT_switch(95) nvoZsCfgFail

1 ADI 1 SNVT_count_inc(9) nviBASOnOff

BI 30 SNVT_switch(95) nvoCmpSafety

BI 37 SNVT_switch(95) nvoIAQSensor

BI 9

BI 20

BI 31 SNVT_switch(95) nvoFilter

BI 43 SNVT_switch(95) nvoSftyChain

Supply Air Temp Sensor R

Remaining

R min ADF 41 SNVT_count_inc(9) nvoOvrTmRem

Setpoint Adjustment R/W

Temperature

Sensor

R/W °F -999 ADF 56 SNVT_temp_p(105) nviSysSpTmp

1=Alarm

1=Enable

1=Alarm

BI 51 SNVT_switch(95) nvoSATSensor

(1)

BO 26 SNVT_switch(95) nviSPAdjEnbl

BI 27

Page 49

Appendix A: Network Points List for RTU Open

N2 Lonworks

Point Name

Point

Units

Default

N2 Network

SNVT Type

SNVT Name

0=Normal

1=Off

Setpoint Adjustment

0=High

Active Optimal Start

R/W

hr 1 ADF

SNVT_count_inc(9)

nviOptmStart

Power Fail Restart Delay

R/W

seconds

ADF

SNVT_count_inc(9)

nviUntStrDly

Indoor Air Quality CO2

0=Normal

Outdoor Air Quality CO2

0=Normal Setpoint

R/W

°F ADF 4 SNVT_temp_p(105)

nviOccCoolSP

Access

SPT Sensor R

Fan / Speed R

Range

R/W °^F 5 ADF 45 SNVT_count_inc(9) nviSPAdjRng

Enthalpy (BACnet) R/W

(ppm)

R ppm ADF 31 SNVT_ppm(29) nvoIAQ

Indoor Air Quality R

Supply Air Temperature R

Space Relative Humidity R

Space Temp Sensor R

(ppm)

R ppm ADF 37 SNVT_ppm(29) nvoOAQ

Gas Valve R

1=Alarm

2=Low 3=Med 4=High 5=On

1=Low

1=Alarm

Value

Point Type

Network Point Address

BI 38

ADI 4

(1)

BO 6 SNVT_switch(95) nviSysEnth

BI 33 SNVT_switch(95) nvoIAQAlm

BI 47 SNVT_switch(95) nvoSATAlm

BI 34 SNVT_switch(95) nvoHiSPRHAlm

BI 46 SNVT_switch(95) nvoSPTmpSen

BI 40 SNVT_switch(95) nvoGasVlvAlm

Page 50

Appendix B: BACnet Protocol Implementation Conformance Statement

The PIC statements are updated regularly. Please refer to the BACnet website http://www.bacnetinternational.net/catalog/index.php?m=28 for the latest information.

Page 51

Appendix C: Modbus Protocol Implementation Conformance Statement

Carrier

RTU Open

Serial Transmission Mode:

Supported?

RTU

Slave only

ASCII

Not supported

Communication Types:

Baud rates:

Data Bits:

Parity:

Stop Bits:

2-wire EIA-485,

9600, 19200,

None

Function Codes:

Purpose:

Used with Register Numbers:

01 – Read Coil Status

Read Discrete Outputs

00001 - 65535

02 – Read Input Status

Read Discrete Inputs

00001 - 65535

03 – Read Holding Registers

Read Holding Registers

00001 - 65535

04 – Read Input Registers

Read Input Registers

00001 - 65535

05 – Force Single Coil

Write Discrete Outputs (single)

00001 - 65535

06 – Preset Single Register

Write Holding Registers (single)

00001 - 65535

15 – Force Multiple Coils

Write Discrete Outputs

00001 - 65535

16 – Preset Multiple Coils

Write Holding Registers

00001 - 65535

Range:

Function Codes Used with this Register Type:

3 – Read Holding Register

16 – Preset Multiple Register

Appendix C: Modbus Protocol Implementation Conformance Statement

Date: 11/12/2013

Vendor Name:

Product Names:

Product Model Number:

Protocol Description:

The RTU Open controller speaks the Modicon Modbus RTU/ASCII Protocol as described in the Modicon Modbus Protocol Reference Guide, PI-MBUS-300 Rev.J. Further details on the Modbus implementation are described

below.

Product Description:

The RTU Open is a factory-installed rooftop controller that is capable of speaking multiple protocols.

Float Value (FLOAT)

38400, 76800

Single-Precision IEEE floating point value

6 – Preset Single Register

Page 52

Appendix C: Modbus Protocol Implementation Conformance Statement

3 – Read Holding Register

Discrete Input (DI)

0 = Off, 1 = On

2 – Read Input Status

1 – Read Coil Status

Unsigned Integer (UINT) 0 - 65535

Signed Integer (SINT) -32768 - 32767

Discrete Output (DO) 0 = Off, 1 = On

6 – Preset Single Register 16 – Preset Multiple Register

5 – Force Single Coil 15 – Force Multiple Coils

Page 53

Appendix D: Johnson N2 Protocol Implementation Conformance Statement

Carrier

RTU Open

Communication Types:

Baud rates:

Data Bits:

Parity:

Stop Bits:

2-wire EIA-485

9600

None

Network Point Types:

Analog Inputs (AI)

Binary Inputs (BI)

Analog Outputs (AO)

Binary Outputs (BO)

Internal Floats (ADF)

Internal Integers (ADI)

Internal Bytes (BD)

Protocol Commands:

Identify Device Type

Sync Time

Poll Without Acknowledge

Poll With Acknowledge

Read Analog Input

Read Binary Input

Read Analog Output

Read Binary Output

Read Internal Parameter

Write Analog Input

Write Binary Input

Write Analog Output

Write Binary Output

Appendix D: Johnson N2 Protocol Implementation Conformance Statement

Vendor Name:

Product Names:

Product Model Number:

Protocol Description:

N2 is not a standard protocol, but one that was created by Johnson Controls, Inc. that has been made open and available to the public. The speed of N2 network is limited to only 9600 baud. The N2 slave address can be set from 01 to 99.

Product Description:

The RTU Open is a factory-installed rooftop controller that is capable of speaking multiple protocols. The RTU Open controller speaks the Johnson N2 Open Protocol as described in the Metasys N2 System Protocol Specification (for Vendors) document, revision 6/13/96. Further details on the N2 supported implementation are described below.

Page 54

Appendix D: Johnson N2 Protocol Implementation Conformance Statement

Write Internal Parameter

Override Analog Input

Override Binary Input

Override Internal Parameter

Override Release Request

Page 55

Appendix E: LonWorks Protocol Implementation Conformance Statement

Carrier

RTU Open

J15

DS1

DS2

SW3

SW1

SW2

Transceiver Type

Appendix E: LonWorks Protocol Implementation Conformance Statement

Vendor Name:

Product Names:

Product Model Number:

Product Description:

The RTU Open is a factory-installed rooftop controller that is capable of speaking multiple protocols. When the LonWorks Option Card (LON-OC), is installed in the field, it enables the RTU Open to communicate over a LonTalk network. The RTU Open does not conform to a standard LonWorks profile, but is self-documenting and any network management tool can manage and configure it over the network. An external interface file (.XIF), is also available so that any network management tool can design and configure the RTU Open prior to installation. Contact your Carrier representative for this .XIF file.

LonWorks is an open protocol that requires the use Echelon's Neuron microprocessor to encode and decode the LonWorks packets. In order to reduce the cost of adding the Echelon chip to every module, a separate LonWorks Option Card (LON-OC) was designed to connect to the RTU Open.

This accessory card must be ordered separately and is connected by attaching its ribbon cable into the connector on the RTU Open. The RTU Open’s baud rate ( communicate with the LON-OC. The address switches (

: TP/FT 10

and

) must be set to 38.4k to

) are not used with LonWorks.

Page 56

Document revision history

Date

Topic

Change description

Code*

2/22/16

Start-up

Added USB Link wiring caution.

C-TS-RD-E-JH 1/8/16

Configuring for BACnet MS/TP

Added note that controller counts as a full load on the MS/TP bus.

C-TS-RD-E

Document revision history

Important changes to this document are listed below. Minor changes such as typographical or formatting errors are not listed.

* For internal use only

Page 57

Index

BACnet compliance • 34 BACnet MS/TP • 7

Compliance • 34

FCC compliance • 34

Johnson N2 • 12, 49

LED's • 32 LonWorks • 14, 15, 51 LonWorks Option Card • 14

Modbus • 9, 11, 47

Network Points List • 35

Sequence of operation

Air source mode determination • 31 Alarms • 27 Compressor Safety • 26 Cooling • 19 Dehumidification • 25 Demand limiting • 25 Door switch • 25 Economizer • 20 Enthalpy control • 23 Fan Status • 26 Filter Status • 27 Fire Shutdown • 26 Heat Pump operation • 24 Heating • 24 Indoor Air CO2 • 23 Indoor Air Quality • 23 Linkage • 29 Occupancy • 18 Optimal Start • 22 Power Exhaust • 21 Pre Occupancy Purge • 21 Remote occupancy • 26 Supply fan • 19 Unoccupied Free Cooling • 21

Start-up • 17

Troubleshooting

Troubleshooting for LonWorks • 16 Troubleshooting for Modbus • 11

Troubleshooting for N2 • 13

Page 58

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A member of the United Technologies Corporation family · Stock symbol UTX · Catalog No. 11-808-521-01 · 2/22/2016

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