Carrier Aquazone 50PSW Integration Guide PDF

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Summary of Content for Carrier Aquazone 50PSW Integration Guide PDF

W2W Open

Integration Guide

CARRIER CORPORATION 2021 Catalog No. 11-808-538-01 6/15/2021

Verify that you have the most current version of this document from www.hvacpartners.com or

www.accounts.ivusystems.com or your local Carrier office.

Important changes are listed in Document revision history at the end of this document.

CARRIER CORPORATION 2021. All rights reserved throughout the world. i-Vu is a registered trademark of Carrier

Corporation. All other trademarks are the property of their respective owners.

Contents Introduction .................................................................................................................................................................. 1

What is the W2W Open controller? ................................................................................................................... 1 Safety considerations & handling warning ....................................................................................................... 3

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

Communications wiring .............................................................................................................................................. 6 Protocol overview .................................................................................................................................................. 6 BACnet MS/TP ...................................................................................................................................................... 7

To set up the W2W Open for BACnet MS/TP ....................................................................................... 7 Troubleshooting BACnet MS/TP communication ................................................................................ 9 Adjusting BACnet MS/TP properties using an Equipment Touch ....................................................... 9

BACnet ARC156 ................................................................................................................................................. 11 To set up the W2W Open for BACnet ARC156 .................................................................................. 11 Troubleshooting ARC156 communication ......................................................................................... 13

Modbus ................................................................................................................................................................ 13 To set up the W2W Open for Modbus ................................................................................................ 13 Troubleshooting Modbus .................................................................................................................... 15

Johnson N2 ......................................................................................................................................................... 16 To set up the W2W Open for N2 ......................................................................................................... 16 Troubleshooting N2 ............................................................................................................................. 17

LonWorks ............................................................................................................................................................ 18 To set up the W2W Open for the LonWorks Option Card (Part #LON-OC) ....................................... 18 Commissioning the controller for LonWorks communication ........................................................... 20 Troubleshooting LonWorks ................................................................................................................. 20

Start-up ....................................................................................................................................................................... 21

Sequence of Operation ............................................................................................................................................. 22 Occupancy ........................................................................................................................................................... 22 Cooling ................................................................................................................................................................. 23 Additional cooling functions ............................................................................................................................ 23 Heating ................................................................................................................................................................ 24 Additional heating functions ............................................................................................................................ 25 Control modes .................................................................................................................................................... 25 Pump/Valve control functions ......................................................................................................................... 27 Changeover Timeguard ..................................................................................................................................... 28 Shutdown ............................................................................................................................................................ 28 Power fail restart delay ..................................................................................................................................... 28 Demand limiting ................................................................................................................................................ 28 Equipment alarm ............................................................................................................................................... 29 Service Test ......................................................................................................................................................... 29 Multi-unit master ............................................................................................................................................... 29 Alarms ................................................................................................................................................................. 30

Troubleshooting the W2W Open .............................................................................................................................. 32 LED's .................................................................................................................................................................... 32

Compliance ................................................................................................................................................................ 34 FCC Compliance ................................................................................................................................................. 34 CE Compliance ................................................................................................................................................... 34 BACnet Compliance........................................................................................................................................... 34

Appendix A: Network Points List for W2W Open ................................................................................................... 35 Third party access to BACnet points in a controller ..................................................................................... 35 Network points list for BACnet and Modbus ................................................................................................. 38 Network points list for N2 and LonWorks ...................................................................................................... 42

Contents

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

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What is the W2W Open controller?

The Water-to-Water (W2W) Open (part #OPN-WSHPW2WM) controller may be used standalone, or as part of an i-

Vu system, or third-party BACnet-distributed control system. The W2W Open control is designed to heat or cool

the load water and to maintain the leaving water or entering water at the control setpoint. Each W2W Open

controller supports up to 4 stages of capacity and up to 3 compressor stages (with compressor status feedback).

You can have controller slaves for equipment or systems with up to 8 stages of control.

On board DIP switches allow you to select the baud rate and choose one of the following protocols:

BACnet MS/TP

BACnet ARC156

Modbus

Johnson N2

LonWorks

The Equipment Touch is a touchscreen device with a 4.3 in. color LCD display that you connect to the Rnet port of

one of the following controllers to view or change its property values, schedule equipment, view trends and

alarms, and more, without having to access the system's server.

You can use Carriers Equipment Touch user interface with the W2W Open controller using the 5-pin J12 Access

Port. See illustration below.

The W2W Open's application supports detailed color graphics, status, properties, alarms, trends, performance,

configuration, and Help on the Equipment Touch. In addition, the W2W Open Startup Wizard has screens to

facilitate the installation technician to initially configure the W2W Open.

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

Introduction

Introduction

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Introduction

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Safety considerations & handling warning

WARNING

When you handle the W2W 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.

Wiring inputs and outputs

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W2W Open Inputs and Outputs Table

Input/Output Type Part Numbers Type of I/O Connection Pin

Numbers

I/O Channel

Inputs

SPT sensors

ZS sensors

Wireless Adapter for

wireless sensors

Equipment Touch

For detailed information,

see:

Carrier Sensors Installation

Guide (SPT)

ZS Sensors Installation or

Application Guide

Wireless Sensors

Installation or Application

Guide

Equipment Touch

Installation and Setup Guide

Communicating

J13, 1 - 4

Rnet Port

Space Relative Humidity 33ZSENSRH-02 AI (4-20 mA) J4 - 5 & 6 AI - 1

Compressor 2 Status N/A BI (Dry Contacts) J5 - 5 & 6 or J1 - 2 BI - 3

Compressor 1 Status N/A BI (Dry Contacts) J5 - 3 & 4 or J1 - 10 BI - 5

Leaving Source Water

Temperature

10K Type II AI (10K Thermistor) J2 - 1 & 2 AI - 6

Leaving Load Water

Temperature

33ZCSENSAT AI (10K Thermistor) J2 - 3 & 4 AI - 7

Compressor 3 Status N/A BI (Dry Contacts) J5 - 1 & 2 BI - 8

Remote Occupancy Contact N/A BI (Dry Contacts) J5 - 7 & 8 BI - 9

Outdoor Air Temperature 10K Type II AI (10K Thermistor) J20 - 1 & 2 AI - 10

Entering Load Water

Temperature

10K Type II AI (10K Thermistor) J20 - 3 & 4 AI - 11

Safety Shutdown Input** N/A 24 Vac J1 - 9 24 Vac IN

Outputs

Load Pump N/A BO Relay (24 Vac, 3A) * J1 - 4 BO - 1

Y4 - Compressor 4th Stage N/A BO Relay (24 Vac, 3A) * J1 - 5 BO - 2 (Y4)

Y3 - Compressor 3rd Stage N/A BO Relay (24 Vac, 3A) * J1 - 6 BO - 3 (Y3)

Y2-Compressor 2nd Stage N/A BO Relay (24 Vac, 3A) J1 - 7 BO - 4 (Y2)

Y1-Compressor 1st Stage N/A BO Relay (24 Vac, 3A) J1 - 8 BO - 5 (Y1)

Reversing Valve (B or O) N/A BO Relay (24 Vac, 3A) * J11 - 7 & 8 (N.O.) BO - 6 (RV)

Source Water Pump / Iso

Valve

N/A BO Relay (24 Vac, 3A) * J11 - 5 & 6 (N.O.) BO - 7

Alarm Lamp N/A BO Relay (24 Vac, 3A) * J11 - 2 & 3 (N.O.) BO - 8

Wiring inputs and outputs

Wiring inputs and outputs

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Input/Output Type Part Numbers Type of I/O Connection Pin

Numbers

I/O Channel

Legend

AI - Analog Input AO - Analog Output

BI - Digital Input BO - Digital Output

*These outputs are configurable.

**24 Vac required at this terminal to provide unit operation.

Communications wiring

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Protocol overview

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, many different protocols might be 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. communicates different types of protocols.

The W2W Open can communicate 1 of 5 different protocols:

BACnet MS/TP (page 7)

BACnet ARC156 (page 11)

Modbus (page 13)

Johnson N2 (page 16)

LonWorks (page 18)

The default setting is BACnet MS/TP. You set the protocol and baud rate using the SW3 DIP switches. The rotary

switches MSB (SW1) and LSB (SW2) set the boards network address. See table below for specific switch settings.

The third party connects to the controller through port J19 for BACnet MS/TP, BACnet ARC156, Modbus, and N2,

and through J15 for the LonWorks Option Card.

NOTE You must cycle power after changing the rotary switches or after connecting the LonWorks Option Card to

J15.

SW3 DIP switch settings

Unused Comm

Option port

Protocol

Baud rate

8 7 6 5 4 3 2 1

BACnet MS/TP

(Default)

Master N/A Off Off Off On Off Select Baud Select Baud

BACnet ARC156 N/A Off Off Off Off Off N/A N/A

Modbus Slave N/A Off Off On On Off Select Baud Select Baud

N2 Slave N/A Off Off Off On On Off Off

Lonworks N/A On On Off On Off Off On

Communications wiring

Communications wiring

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Baud DIP switch settings

Baud Rate DIP switch 2 DIP switch 1

9,600 bps Off Off

19.2 kbps On Off

38.4 kbps Off On

76.8 kbps (Default) On On

BACnet MS/TP

To set up the W2W Open for BACnet MS/TP

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.

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

1 Turn off the W2W Open's power.

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

2 Using the rotary switches MSB (SW1) and LSB (SW2), set a unique BACnet MS/TP MAC address for the W2W

Open. Set the MSB (SW1) switch to the tens digit of the address, and set the LSB (SW2) switch to the ones

digit. Valid addresses are 01-99.

NOTE 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.

EXAMPLE To set the controllers MS/TP MAC address to 01, point the arrow on the MSB (SW1) switch to 0

and the arrow on the LSB (SW2) switch to 1. Internally, the BACnet device instance is automatically

generated as 1610101.

10's 1's

1

3

45

2

7 8

9

6

01

3

45

2

7 8

9

6

0 SW1 SW2MSB LSB

Communications wiring

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3 Set the SW3 DIP switches 1 and 2 for the appropriate communications speed (9600, 19.2k, 38.4k, or 76.8k

bps).

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

W2W Open is fixed at 8 data bits, No Parity, and 1 Stop bit for this protocol's communications.

Baud DIP switch settings

Baud rate 2 1

9,600 bps Off Off

19.2 kbps On Off

38.4 kbps Off On

76.8 kbps On On

4 Set the remaining DIP switches as follows:

BACnet MS/TP DIP switch settings

8 7 6 5 4 3

Off Off Off Off On Off

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

5 Connect the BACnet MS/TP network to the controller's J19 Network Comm port. Connect to Net+, Net-, and

SHLD.

Wire specifications

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

NOTE Use the same polarity throughout the network segment.

Communications wiring

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6 Turn on the W2W Open's power.

Troubleshooting BACnet MS/TP communication

For detailed troubleshooting and a list of supported objects, get the controller's BACnet PICS from the Carrier

BACnet PICS website http://www.bacnetinternational.net/catalog/index.php?m=28. You must get your BACnet

Object list from the manufacturer.

The most common communication problems are the result of not properly following the configuration steps

outlined in this manual. Review all of the steps and use the following list to check your settings.

Verify accuracy of the following:

Hardware settings for BACnet MS/TP (8 Data bits, No Parity, and 1 Stop bit):

Baud rate DIP switches DS2 and DS1

BACnet MS/TP protocol DIP switches DS3 - DS6

Jumper set to EIA-485

Proper connection wiring

Unique rotary address switches 1 99. If controllers have duplicate addresses, network communication can

be lost.

Unique BACnet Device Instance numbers. Default is 16101XX, with the rotary address switches defining XX. If

controllers have duplicate device instance numbers, network communication can be lost.

NOTES

The controller recognizes physical changes (DIP switches, rotary switches, and jumpers) upon power up.

If RX LED is solid, then the terminations are incorrect.

If the network has greater than 32 devices or exceeds 2,000 feet, a Repeater should be installed.

If a controller begins or ends a network segment, a terminating resistor may be needed.

Adjusting BACnet MS/TP properties using an Equipment Touch

You may need to adjust the following BACnet MS/TP protocol timing settings using the Equipment Touch.

Max Masters - 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.

Max Info Frames - defines the maximum number of responses that will be sent when the W2W Open receives the

token. The default is 10 and should be ideal for the majority of applications. In cases where the W2W Open is the

target of many requests, this number could be increased as high as 100 or 200.

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NOTES

BACnet 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 for Network Points List.

See Appendix B (page 46) for the BACnet Protocol Implementation Conformance Statement (PICS).

To set the Device Instance number or adjust the Max Masters or Max Info Frames using an Equipment Touch

1 In the Equipment Touch interface, navigate to the Properties Menu screen and click Login.

NOTE The following graphic is generic and not specific to your system.

2 Type Touch for the password and click Done.

3 On the Properties Menu screen, scroll to the bottom of the list and click ET System.

4 On the ET System screen, click Setup.

5 On the Setup screen, click Module Setup.

Communications wiring

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6 On the Module Setup screen, click Communication.

On the Communication screen, edit the fields as needed:

7 Click the property box next to BACnet Device Instance, type the new number, and click Done.

8 Click the property box next to Max Masters and/or Max Info Frames, type a new value (1-127), and click

Done.

9 Click Save.

BACnet ARC156

To set up the W2W Open for BACnet ARC156

The W2W Opens latest supported function codes and capabilities are listed on the associated Protocol

Implementation Conformance Statement (PICS), Carrier BACnet PICS website

http://www.bacnetinternational.net/catalog/index.php?m=28.

1 Turn off the W2W Open's power.

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

2 Using the rotary switches MSB (SW1) and LSB (SW2), set a unique BACnet MS/TP MAC address for the W2W

Open. Set the MSB (SW1) switch to the tens digit of the address, and set the LSB (SW2) switch to the ones

digit. Valid addresses are 01-99.

NOTE 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.

EXAMPLE To set the controllers MAC address to 01, point the arrow on the MSB (SW1) switch to 0 and the

arrow on the LSB (SW2) switch to 1. Internally, the BACnet device instance is automatically generated as

1610101.

10's 1's

1

3

45

2

7 8

9

6

01

3

45

2

7 8

9

6

0 SW1 SW2MSB LSB

Communications wiring

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3 Set the remaining DIP switches as follows:

BACnet ARC156 DIP switch settings

8 7 6 5 4 3

Off Off Off Off N/A N/A

The following example shows the DIP switches set for BACnet ARC156.

4 Connect the BACnet ARC156 network to the controller's J19 Network Comm port. Connect to Net+, Net-, and

SHLD.

Wire specifications

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

NOTE Use the same polarity throughout the network segment.

5 Turn on the W2W Open's power.

Communications wiring

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Troubleshooting ARC156 communication

The most common communication problems result from not properly following the configuration steps outlined

above in this manual. Review all of the steps and use the following list to check your settings.

Verify accuracy of the following:

Protocol DIP switches DS3 - DS6

Proper connection wiring

Unique rotary address switches 1 99. If controllers have duplicate addresses, network communication can

be lost.

Unique BACnet Device Instance numbers. Default is 16101XX, with the rotary address switches defining XX. If

controllers have duplicate device instance numbers, network communication can be lost.

NOTES

The controller recognizes physical changes (DIP switches, rotary switches, and jumpers) upon power up.

If RX LED is solid, then the terminations are incorrect.

If the network has greater than 32 devices or exceeds 2,000 feet, a Repeater should be installed.

If a controller begins or ends a network segment, a terminating resistor may be needed.

Software settings defined through the Equipment Touch device. To confirm settings, obtain a Modstat of the

device. On the Equipment Touch, click the link to the Modstat.

Modbus

To set up the W2W Open for Modbus

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

1 Turn off the W2W Open's power.

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

2 Using the rotary switches, set a unique Modbus slave address for the W2W Open. Set the MSB (SW1) switch

to the tens digit of the address, and set the LSB (SW2) switch to the ones digit. Valid Modbus slave

addresses are 01-99.

EXAMPLE To set the controller's Modbus slave address to 01, point the arrow on the MSB (SW1) switch to 0

and the arrow on the LSB (SW2) switch to 1.

10's 1's

1

3

45

2

7 8

9

6

01

3

45

2

7 8

9

6

0 SW1 SW2MSB LSB

Communications wiring

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3 Set the SW3 DIP switches 1 and 2 for the appropriate communications speed (9600, 19.2k, 38.4k, or 76.8k

bps).

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

W2W Open is fixed at 8 data bits, No Parity, and 1 Stop bit for this protocol's communications.

Baud DIP switch settings

Baud rate 2 1

9,600 bps Off Off

19.2 kbps On Off

38.4 kbps Off On

76.8 kbps On On

4 Set the remaining DIP switches as follows:

Modbus DIP switch settings

8 7 6 5 4 3

Off Off Off On On Off

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

5 Connect the Modbus EIA-485 network to the W2W Open's J19 Network Comm port. Connect to Net+, Net-,

and SHLD.

Wire specifications

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

NOTE Use the same polarity throughout the network segment.

6 Turn on the W2W Open's power.

Communications wiring

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Troubleshooting Modbus

Check the following to troubleshoot your W2W Open:

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

switches DS3 - DS6.

2 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 Network Communications to view

the active protocol and baud rate.

3 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 The BAS and the controller have the same communication settings (8 data bits, No Parity, and 1 stop bit).

Proper connection wiring between the BAS and the controller.

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

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

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

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

Modbus Exception Codes that might be returned from this controller

Codes Name Description

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

supported by the controller.

02 Illegal Data

Address

The register address used in the query is not supported

by the controller.

04 Slave Device

Failure

The Modbus Master has attempted to write to a non-

existent register or a read-only register in the

controller.

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Johnson N2

To set up the W2W Open for N2

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

1 Turn off the W2W Open's power.

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

2 Using the rotary switches, set a unique N2 slave address for the W2W Open. Set the MSB (SW1) switch to the

tens digit of the address, and set the LSB (SW2) switch to the ones digit. Valid N2 slave addresses are 01-99.

EXAMPLE To set the N2 slave address to 01, point the arrow on the MSB (SW1) switch to 0 and the arrow on

the LSB (SW1) switch to 1.

10's 1's

1

3

45

2

7 8

9

6

01

3

45

2

7 8

9

6

0 SW1 SW2MSB LSB

3 Set the DIP switches 1 and 2 for 9600 bps baud.

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

W2W Open is fixed at 9600 bps baud, 8 data bits, No Parity, and 1 Stop bit.

4 Set the remaining DIP switches as follows:

N2 DIP switch settings

8 7 6 5 4 3 2 1

Off Off Off Off On On On On

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

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5 Connect the N2 EIA-485 network to the controller's J19 Network Comm port. Connect to Net+, Net-, and

SHLD.

Wire specifications

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

NOTE Use the same polarity throughout the network segment.

6 Turn on the W2W Open's power.

Troubleshooting N2

Check the following to troubleshoot your W2W Open:

1 Verify that the BAS and controller are both set to speak N2 protocol on the Comm Selector DIP switches DS3 -

DS6.

2 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 Network Communications to view

the active protocol and baud rate.

3 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 The BAS and the controller have the same communication settings (8 data bits, No Parity, and 1 stop bit).

Proper connection wiring between the BAS and the controller.

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

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

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

NOTES

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

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

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LonWorks

WARNING

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.

Ensure that you are properly grounded.

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

To set up the W2W Open for the LonWorks Option Card (Part #LON-OC)

1 Turn off the W2W Open's power.

NOTES

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

cycled!

The controllers rotary address switches are not used when the LON-OC is installed. Thats because each

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

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2 Set the SW3 DIP switches for LonWorks as follows:

8 7 6 5 4 3 2 1

Off On On Off On Off Off On

3 Plug the LonWorks Option Card's ribbon cable into Comm Option port J15 on the controller. See illustration

below.

CAUTION! The controller must be OFF before being connected.

4 Connect the LonWorks network to the LonWorks Option Card's 2-pin Net port.

NOTE The 2-pin Net port provides TP/FT-10 channel compatibility. The TP/FT-10 or "Free Topology" network

type is polarity insensitive. Use 24 to 16 AWG twisted pair wire.

5 Turn on the W2W Open's power.

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

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Commissioning the controller for LonWorks communication

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 systems network layout diagram. This is

done using the devices unique Neuron ID.

A network management tool such as Echelons 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.

When a new device is first commissioned onto the LonWorks network, the system integrator must upload the

devices External Interface File (XIF) information. LonWorks uses the XIF to determine the points (network

variables) that are available from a device. The W2W Open has a set of predefined network variables. These

variables can be bound or accessed by the Network Management Tool.

The Browse feature of the Network Management Tool allows you to read real-time values from the W2W Open.

The Network Management Tool allows you to test integration prior to binding the controller's network variables to

other LonWorks nodes.

Troubleshooting LonWorks

Check the following to troubleshoot your W2W Open:

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

switches DS3 - DS6.

2 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 Network Communications 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

SW3 (switch DS7). 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 20).

6 Use the Browse 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.

Start-up

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Use one of the following interfaces to start up, access information, read sensor values, and test the controller.

This interface... Provides a...

Field Assistant application -

Runs on a laptop that connects to controller's Local Access port 1

Temporary interface

Equipment Touch device -

Connects to controller's Rnet port 2

Temporary or permanent

interface

i-Vu application

Available for BACnet systems only

Permanent interface

System Touch device

Available only for BACnet MS/TP systems.

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

Temporary or permanent

interface

1 Requires a USB Link (Part #USB-L). 2 See the Equipment Touch Installation and Setup Guide for detailed instructions. 3 See the System Touch Installation and Setup Guide for detailed instructions.

CAUTION 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.

Start-up

Sequence of Operation

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he W2W Open may be used standalone, or as part of an i-Vu system, or third-party BACnet control system. The

control is designed to heat or cool the load water and to maintain the leaving or entering water at the control

setpoint. Each controller supports up to 4 stages of capacity and up to 3 compressor stages (with compressor

status feedback). Also, you can have controllers that are slaves if you have equipment or systems with up to 8

stages of control.

The following sections describe the multi-protocol controller's functions. All point objects mentioned in this

sequence of operation reference the touchscreen interface. Points in Field Assistant and the i-Vu application are

the same or similar.

Occupancy

Occupancy settings are used to start and stop the unit, based on a time period. When occupied, the leaving water

temperature or entering water temperature is controlled to the specified heating or cooling setpoints. By default,

the control is continuously occupied and is enabled to maintain the water temperature at the water supply

setpoint. During unoccupied periods, no heating or cooling operation is allowed.

You can determine occupancy using any of the 4 methods defined below:

Local Time Schedules - Each controller has local time schedules. Time schedules are configured using an

Equipment Touch, Field Assistant, or the i-Vu application. See the product's documentation for instructions.

Note that the controller's local time and date must be set for these functions to operate properly.

System Occupancy - System Occupancy provides a means for W2W controls, installed as part of an i-Vu

Control System, to have their occupancy determined by another controller on the controls network. A Binary

Network input (BNI2) object reads the present_value of the Occupancy Status variable of another controller.

You must setup System Occupancy in Field Assistant or the i-Vu application.

BAS (Building Automation System) On/Off - BAS On/Off provides a means for the control, installed as part of

a third-party BACnet system, to have their occupancy determined by another device on the controls network.

A Network Visible, BACnet Multi-state Value object may be written to by the third-party device to set the

control's occupied state, as required. Determining the occupancy using this method takes precedence over

all others. No special configuration is necessary to use this function. Object address information is also

described in this Integration Guide

Remote Occupancy Contact - The control can use an external dry contact closure to determine the occupancy

status of the unit. The external contact may be normally closed or normally opened. Assuming a normally

open contact, the controller is unoccupied when the remote contact is open, and occupied when the contact

is closed. A normally closed contact is unoccupied when the remote contact is closed, and occupied when the

remote contact is open.

Sequence of Operation

Sequence of Operation

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Cooling

When configured for Single/Slave Unit operation, the control operates up to 4 stages to maintain the desired

chilled water setpoint. The control point can be selected by setting the Control Type to either the leaving water

temperature sensor (default) or the entering water temperature sensor. While in the cooling mode, the

compressor outputs are controlled by the PI (Proportional-integral) cooling loop and cooling stages capacity

algorithm. The algorithms calculate the desired number of stages needed to satisfy the load water setpoint by

comparing the actual water temperature sensor value to the chilled water setpoint.

An independent leaving load water temperature safety check is included to verify that sufficient load water flow is

provided. Regardless of the control type, as the leaving load water temperature exceeds the configured Chilled

Water Supply Setpoint, the compressor stages start to be reduced as required.

The following conditions must be true in order for the cooling algorithm to run:

Unit is occupied (see Occupancy (page 22))

The lockout temperature (OAT, SPT, or T1) is greater than the Cooling lockout temperature setpoint

Cooling mode is set to Enable

Heat mode is not active and the compressor time guard has expired

The Changeover time guard has elapsed

Load water temp is above the Chilled Water Supply Setpoint

If all the above conditions are met, the compressor(s) is energized as required to satisfy the cooling requirements.

While cooling, the reversing valve output is held in the cooling position (either type B or O, as configured) even

after compression is stopped. The valve does not switch position until the heating mode is required.

During cooling operation, the control employs a 5 minute time delay before each subsequent stage of

compression is energized to allow the leaving water temperature (LWT) to achieve a stable temperature and avoid

overshoot. Once energized, a stage of compression will have to run for at least 180 seconds before being staged

off, to avoid short-cycling. Once a compressor is staged off, it may not be restarted again until a 5-minute time

guard delay period expires.

The controller provides 3 binary compressor status inputs to monitor compressor operation. These inputs are

monitored to determine if the compressor status matches its commanded state. These inputs determine if a

refrigerant safety switch or other safety device has tripped and has caused the compressor to stop operating

normally. If this occurs, an alarm is generated to indicate the faulted compressor condition. The Compressor

Status Alarm includes a 6 minute delay to avoid nuisance alarms.

Additional cooling functions

Cooling Setpoint OA Reset - You can configure the control to reset the chilled water setpoint, proportionally based

upon OAT. You can configure the amount of reset and the reset range. This feature can provide energy savings by

operating the unit at a higher load water temperature setpoint when the minimum chilled water temperature is not

required. You can also use it to better match the chilled water temperature to the cooling load requirements.

The following conditions must be true in order for the Cooling Setpoint OA Reset algorithm to run:

The preconditions for cooling operation have been met

The controller has a valid Outdoor Air Temperature

Cooling Setpoint OA Reset is Enabled

Sequence of Operation

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RH Cooling Setpoint Reset - When the OAT Cooling Setpoint Reset function is enabled, the control can limit the

(OAT) chilled water setpoint reset, based on the difference between the High RH setpoint and the measured RH

value (Space RH or Outdoor Air RH).

The RH Cooling Setpoint reset override uses a PI function to determine the limit applied to the Cooling Setpoint OA

Reset function.

The following conditions must be true in order for the RH Cooling Setpoint Reset algorithm to run:

The preconditions for cooling operation have been met

The preconditions for Cooling Setpoint OA Reset operation have been met

The controller has a valid Relative Humidity value

RH Cooling Setpoint OA Reset is Enabled

Heating

When configured for Single/Slave Unit operation, the control operates up to 4 stages of compression to maintain

the desired hot water supply setpoint. You select the control point by setting the Control Type to the leaving water

temperature sensor (default) or the entering water temperature sensor. While in the heating mode, the

compressor outputs are controlled by the PI (Proportional-integral) heating loop and heating stages capacity

algorithm. The algorithms calculate the number of stages needed to satisfy the load water setpoint by comparing

the actual water temperature sensor value to the hot water supply setpoint.

In addition, an independent leaving load water temperature safety check is included to verify that sufficient load

water flow is provided. Regardless of the control type, as the leaving load water temperature exceeds the

configured Hot Water Supply Setpoint, the compressor stages are reduced as required.

The following conditions must be true in order for the heating algorithm to run:

Unit is occupied (see Occupancy (page 22))

The lockout temperature (OAT, SPT, or T1) is less than the Heating lockout temperature setpoint

Heat Enable is set to Enable

Cool mode is not active and the compressor time guard has expired

The Changeover time guard has elapsed

Load water temp is below the Hot Water Supply Setpoint

If all the above conditions are met, the compressors satisfy the heating requirements. While heating, the reversing

valve output is held in the heating position (type B or O, as configured), even after compression stops. The valve

does not switch position until the cooling mode is required.

During heating operation, the control employs a 5 minute time delay before each subsequent stage of

compression, to allow the leaving water temperature (LWT) to achieve a stable temperature and avoid overshoot.

Once energized, a stage of compression has to run for at least 180 seconds before being staged off, to avoid

short-cycling.

Sequence of Operation

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Once a compressor is staged off, it may not be restarted again until a 5 minute time guard delay period expires.

The controller provides 3 binary compressor status inputs to monitor compressor operation. These inputs are

monitored to determine if the compressor status matches its commanded state. These inputs are used to

determine if a refrigerant safety switch or other safety device has tripped and caused the compressor to stop

operating normally. If this happens, an alarm is generated to indicate the faulted compressor condition. The

Compressor Status Alarms include a 6 minute delay to avoid nuisance alarms.

Additional heating functions

Heating Setpoint OA Reset - You can configure the control to reset the hot water supply setpoint, proportionally

based upon OAT. You can configure the amount of reset and the reset range. This feature provides energy savings

by operating the unit at a lower load water temperature setpoint when the maximum hot water supply

temperature is not required. It can also be used to more closely match the hot water temperature to the heating

load requirements.

The following conditions must be true in order for the Heating Setpoint OA Reset algorithm to run:

The preconditions for heating operation have been met (see Heating (page 24))

The controller has a valid Outdoor Air Temperature

Heating Setpoint OA Reset is Enabled

Control modes

The following control modes are available for unit operation. Any mode may be selected by the installer or by an

authorized operator using an Equipment Touch, Field Assistant, or the i-Vu application.

Manual Cool - Configuring the Control Mode Selection for Manual Cool places the control in a cooling-only mode

and the machine operates as a chiller. When you enable Manual Cool, the controller operates as described in

Cooling (page 23). The Outdoor Air and Relative Humidity Cooling setpoint reset functions are available if the

preconditions are met.

When the Control Mode Selection is set to Manual Cool, the lockout temperature (OAT, SPT, or T1) is overridden,

even when the input is available. The control operates as required to maintain the Chilled Water Supply

Temperature setpoint, regardless of any previously configured lockout temperature.

The following conditions must be true in order for the cooling algorithm to run in Manual Cool:

Control Mode Selection is set to Manual Cool

Cool Enable is set to Enable

Unit is occupied (see Occupancy (page 22))

Load water temp is above the Chilled Water Supply Setpoint

Sequence of Operation

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Manual Heat - Configuring the Control Mode Selection for Manual Heat places the control in a heating-only mode.

When you enable Manual Heat, the controller operates as described in Heating (page 24). The Heating Setpoint

OA Reset function is available if the preconditions are met.

When the Control Mode Selection is set to Manual Heat, the lockout temperature (OAT, SPT, or T1) is overridden,

even when the input is available. The control operates as required to maintain the Hot Water Supply Temperature

setpoint, regardless of any previously configured lockout temperature.

The following conditions must be true in order for the heating algorithm to run in the Manual Heat control mode:

Control Mode Selection is set to Manual Heat

Heat Enable is set to Enable

Unit is occupied (see Occupancy (page 22))

Load water temp is below the Hot Water Supply Setpoint

OAT - Configuring the Control Mode Selection for OAT sets the control to change modes between heating and

cooling automatically, based on the Outdoor Air Temperature (OAT). The control compares the OAT to the

configured lockout temperatures for heating and cooling and selects the appropriate operating mode. This mode

requires a valid outdoor air temperature reading (hardware or network). Once enabled, equipment control is as

described for heating & cooling.

When conditions require cooling, the controller operates as described in Cooling (page 23). The Outdoor Air and

Relative Humidity Cooling setpoint reset functions are available if the preconditions are met.

The following conditions must be true in order for the cooling algorithm to run in the OAT control mode:

A valid Outdoor Air Temperature is present

Control Mode Selection is set to OAT

Cool Enable is set to Enable

Unit is occupied (see Occupancy (page 22))

The OAT is greater than the Cooling lockout temperature setpoint

Heat mode is not active and the compressor time guard has expired

The Changeover time guard has elapsed

Load water temp is above the Chilled Water Supply Setpoint

SPT - Configuring the Control Mode Selection for SPT sets the control to change modes between heating and

cooling based on the Space Temperature sensor located in the space or return air plenum (SPT). The control will

compare the SPT to the configured lockout temperatures for heating and cooling and select the appropriate

operating mode. For this mode, a valid space temperature reading (hardware or network) is required. Once

enabled, equipment control is as described for heating & cooling.

When conditions require cooling, the controller operates as described in Cooling (page 23). The Outdoor Air and

Relative Humidity Cooling setpoint reset functions are available if the preconditions are met.

The following conditions must be true in order for the cooling algorithm to run in the SPT control mode:

A valid SPT is present

Control Mode Selection is set to SPT

Cool Enable is set to Enable

Unit is occupied (see Occupancy (page 22))

The SPT is greater than the Cooling lockout temperature setpoint

Sequence of Operation

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Heat mode is not active and the compressor time guard has expired

The Changeover time guard has elapsed

Load water temp is above the Chilled Water Supply Setpoint

System T1 Temp - Configuring the Control Mode Selection for System T1 Temp sets the control to change modes

between heating and cooling, based on a network temperature. The control compares the network temperature to

the configured lockout temperatures for heating and cooling and selects the appropriate operating mode. The

System T1 Temperature network input object must be addressed to read the desired temperature and

communicate for this mode. Once enabled, equipment control is as described for heating and cooling.

When conditions require cooling, the controller operates as described in Cooling (page 23). The Outdoor Air and

Relative Humidity Cooling setpoint reset functions are available if the preconditions are met.

The following conditions must be true in order for the cooling algorithm to run in the T1 control mode:

A valid network T1 temperature is present

Control Mode Selection is set to T1

Cool Enable is set to Enable

Unit is occupied (see Occupancy (page 22))

The T1 Temperature is greater than the Cooling lockout temperature setpoint

Heat mode is not active and the compressor time guard has expired

The Changeover time guard has elapsed

Load water temp is above the Chilled Water Supply Setpoint

Pump/Valve control functions

Load Pump - There is a dedicated binary output to control a load pump. The load pump output is energized when

the unit is occupied. When power is first applied to the control, or reapplied after a power outage, the pump output

is energized after the Power Fail Restart Delay (page 28) expires.

The pump control includes a configurable Pump Stop Delay. The stop delay defines the time the pump continues

to operate after heating or cooling stops, if the unit transitions to unoccupied. The Pump Stop Delay default value

is 45 seconds and may be adjusted between 0 and 180 seconds. Note that on a request for unit shutdown, the

pump continues to operate until all compression is disabled and the configured pump delay expires.

Source Water Isolation Valve/Source Water Pump Output - There is a dedicated binary output to control a source

water isolation valve or dedicated source water pump. The output is energized prior to starting any compression

stage.

The output includes a configurable close/off delay. The delay defines the time the isolation valve remains open or

the pump continues to operate after the last stage of compression stops. The Iso Valve Close Delay default value

is 45 seconds and may be adjusted between 0 and 180. Note that on a request for unit shutdown, the valve

remains open until all compression is disabled and the configured valve close delay expires.

Sequence of Operation

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Changeover Timeguard

The control uses a fixed 5 minute Changeover Timeguard to protect the equipment, in the event of any immediate

mode change between heating and cooling. The timeguard stops compressor operation for 5 minutes to allow

water temperatures and refrigerant pressures to normalize before restarting the compressor. You can see the

status (Inactive / Active) of the Changeover Timeguard in the controllers Maintenance expander.

Shutdown

The control includes a unit shutdown function. Shutdown is a software switch that allows an operator to stop unit

operation. Shutdown is a BACnet binary value (object name shutdown) and is accessed in the Status expander via

the Shutdown variable. Setting Shutdown to Active immediately stops compressor operation. The pump and valve

outputs remain energized until their off-delays have expired (see Pump/Valve control functions).

The equipment remains off as long as Shutdown is active. Shutdowns default state is inactive. Shutdown may be

enabled from the UI, or accessed via the network, when the controller is part of a BACnet MS/TP network.

Power fail restart delay

The control includes an adjustable Power Fail Restart Delay (PFRD). The PFRD holds off the equipment startup

until the configured delay time has expired and may be used to stagger equipment starts after a power outage.

The PFRD default value is 60 seconds, but may be adjusted from 0 to 600 seconds.

Demand limiting

The control has the ability to accept a demand limit signal from the network. The demand limit function provides a

means for W2W Open controls, installed as part of an i-Vu Control System, to have their heating and chilled

water setpoints expanded (lowered and raised) to lower the equipment's electricity consumption. You can adjust

the setpoint for each of the 3 demand levels for both heating and cooling. The configured demand level values are

cumulative. A level 3 demand limit incorporates the reset values of demand level 1 + demand level 2 + demand

level 3.

If both outdoor air setpoint reset and demand level limiting are simultaneously active, the reset value applied is

the greater of the 2 individual reset functions that are in effect, but NOT the cumulative total of both.

Sequence of Operation

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Equipment alarm

The control provides an alarm output that illuminates an equipment-mounted alarm lamp, and generates a

generic Equipment Alarm, under certain alarm conditions configured by an operator. See Alarms (page 30) for

configuration instructions related to Equipment Alarm.

Service Test

There is a built-in Service Test function to test the controller's outputs independently.

The Isolation Valve Test energizes the control's Isolation Valve Binary Output.

The Water Pump Test energizes the control's Water Pump Binary Output.

The Compressor Test energizes the control's Compressor Binary Outputs.

The Alarm Indicator Test energizes the control's Alarm Indicator Binary Output.

Using Service Test disables normal equipment operation. Service Test operates in accordance with the control's

configuration. For example, initiating the Compressor Test function of Service Test on a 2-stage heat pump, that is

configured to provide both heating and cooling, energizes the stages of compression by staging up in Cooling, then

changing the reversing valve, before staging down in Heating. Although the isolation valve and water pump

outputs may be tested independently, they are automatically energized when the Compressor Test is enabled.

Service Test times out (disables) automatically after 60 minutes if the technician does not disable it after

completing the test.

Multi-unit master

On installations having multiple W2W Opens serving a common load, the heat pumps may be controlled as a

single heating or cooling source, utilizing the Multi-unit Master Operating Mode.

For these installations, the controllers are networked together. One of the installed heat pumps operates as a

Master control, with the remaining controllers operating as Slaves. The number of stages required to meet load

conditions are determined by the Master control. Slave controllers receive the number of stages required from the

Master and energize their compressor outputs appropriately, in sequence.

In this fashion, a Multi-unit Master system can provide up to 8 total stages of control. A Multi-unit Master system

provides coordinated heat pump operation with the same feature set and sequences of operation as a Single Unit

configuration.

In this configuration, an independent leaving load water temperature safety check at each unit is included to verify

that sufficient load water flow is provided. Should the leaving load water temperature fall below the configured

Chilled Water Setpoint in cooling or the Hot Water Setpoint in heating, the compressor stages for any unit (master

or slave) are reduced as needed without reducing the system staging requirements.

IMPORTANT Be sure to configure each slave unit for standalone operation as a fail-safe. Many individual

configuration parameters that are not required or used during slave operation, such as the chilled water and hot

water setpoints, are hidden once the slave is linked to a master unit.

Sequence of Operation

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Alarms

Equipment Alarm The Alarm Lamp binary output sets to the alarm state when any point, specified to

initiate an Equipment Alarm, is currently in alarm.

Compressor Status Indicates an alarm when any Compressor Alarm is active. The control generates a

compressor failure alarm if the compressor status input detects the compressor is OFF after the associated

compressor output has been energized. A 6 minute alarm delay is used to allow the compressor to start

(prevents alarms due to timeguard operation) before an alarm condition is detected. The control monitors

the compressor output and, if the compressor output is energized, the compressor status input must detect

the compressor operation.

SPT Sensor (if SPT sensor was active) The control generates an SPT sensor failure alarm if the SPT

sensor fails to communicate with the control for 5 minutes or longer. The update status is monitored and, if

it fails to be updated, then an SPT sensor alarm is generated.

System T1 Sensor (if System T1 Temperature was active) The control generates a T1 Sensor failure alarm

if the value of the T1 sensor fails to be updated through the network after once being active. The update

status is monitored and, if it fails to be updated, then a T1 sensor alarm is generated. There is an alarm

delay (approximately 10 minutes) to prevent alarms, while minimizing the required update rate.

NOTE You can reset this alarm by momentarily setting the Shutdown point to Active.

Leaving Load Water Temperature Indicates an alarm if the Leaving Load Water Temp falls below the low,

or exceeds the high, alarm limits for more than 1 minute. The equipment (load pump) must be operating for

more than 3 minutes before the load water conditions above are evaluated. A 2 F hysteresis is applied

after an alarm condition is detected.

Leaving Load Water Temperature Sensor The control generates an alarm if the value of Leaving Load

Water Temp fails to be updated through the network after once being active, or if the local sensor fails

(measures a sensor temperature greater than 200 or less than -50 F, indicating a shorted or open

sensor). The update status is monitored and, if it fails to be updated, a Leaving Load Water Temp Sensor

alarm is generated. There is an alarm delay of approximately 10 minutes for network sensors to prevent

false alarms, while minimizing the required update rate. Local sensors connected directly to the controller

have a 1 minute alarm delay.

NOTE You can reset this alarm by momentarily setting the Shutdown point to Active.

Entering Load Water Temperature Indicates an alarm if the Entering Load Water Temp falls below the

low, or exceeds the high, alarm limits for more than 1 minute. The equipment (load pump) must be

operating for more than 3 minutes before the load water conditions above are evaluated. A 2 F hysteresis

is applied after an alarm condition is detected.

Entering Load Water Temperature Sensor The control generates an alarm if the value of Entering Load

Water Temp fails to be updated through the network after once being active, or if the local sensor fails

(measures a sensor temperature greater than 200 or less than -50 F, indicating a shorted or open

sensor). The update status is monitored and if it fails to be updated, then a Entering Load Water Temp

Sensor alarm is generated. There is an alarm delay (approximately 10 minutes for network sensors) to

prevent false alarms, while minimizing the required update rate. Local sensors connected directly to the

controller have a 1 minute alarm delay.

NOTE You can reset this alarm by momentarily setting the Shutdown point to Active.

Source Water Temperature Indicates an alarm if the Source Water Temp falls below the minimum, or

exceeds the maximum heating or cooling limits. The control has 4 configurable alarm limits for source

water temperature. The control verifies that the water temperature is within operating range (between high

and low limits) for the specific operating mode (heating or cooling) before energizing the compressor. Once

the compressor is started, the source water temperature is further monitored to verify that it is within limits

to ensure sufficient water is flowing through the coil. If the leaving source water temperature rises above or

falls below the appropriate limits, an alarm is generated and the compressors shut down immediately.

Sequence of Operation

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Leaving Source Water Temp Sensor Indicates an alarm if the Leaving Source Water Temp sensor fails

(measures a local sensor temperature greater than 200 or less than -50 F, indicating a shorted or open

sensor).

System Entering Source Water Temp Fail (if System Entering Source Water Temperature was active) The

control generates an alarm if the value of System Entering Source Water Temp fails to be updated through

the network after once being active. The update status is monitored and if it fails to be updated, then a

System Entering Source Water Temp Fail alarm is generated. There is an alarm delay (approximately 10

minutes) to prevent false alarms, while minimizing the required update rate. (BACnet Only)

NOTE You can reset this alarm by momentarily setting the Shutdown point to Active.

Outdoor Air Temperature Indicates an alarm if the outdoor air temperature falls below the low, or

exceeds the high, alarm limits for more than 1 minute and the controller is receiving a valid OAT value. If

the controller is operating as a slave unit, this alarm is not generated. A 1 F hysteresis is applied after an

alarm condition is detected.

Outdoor Air Temp Sensor (if System Outdoor Air Temperature was active) The control generates an OAT

Sensor failure alarm if the value of OAT fails to be updated through the network after once being active. The

update status is monitored, and if it fails to be updated, then an OAT sensor alarm is generated. There is an

alarm delay (approximately 1 hour) to prevent false alarms, while minimizing the required update rate for

OAT.

NOTE You can reset this alarm by momentarily setting the Shutdown point to Active.

Space Relative Humidity The control can generate an alarm when the space relative humidity exceeds

the alarm setpoint. There are separate occupied and unoccupied high humidity alarm setpoints. The control

has a 5 minute alarm delay during unoccupied periods. During occupied periods, the controller uses the

occupied high RH alarm limit. When an occupancy transition from unoccupied to occupied occurs, or the

occupied high alarm limit is lowered, causing an alarm condition to occur, the control automatically

calculates an alarm delay (equivalent to the configured delay time in minutes/% RH, times the humidity

error condition that occurred, plus 15 minutes). This prevents nuisance alarms when an occupancy change

occurs and allows time for the unit to correct an alarming humidity condition.

Source Water Linkage (if Source Water Linkage was active) The control generates a Source Water

Linkage failure alarm if Linkage fails after once being active. The Linkage status is monitored and if it fails

to be updated from the Loop controller, then a Source Water Linkage alarm is generated. There is a 6

minute alarm delay to prevent false alarms.

NOTE You can reset this alarm only by re-establishing Linkage and correcting the condition that caused the

Linkage failure, or by momentarily setting the Shutdown point to Active (BACnet Only).

Troubleshooting the W2W Open

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The W2W Open controller acts as an intelligent embedded thermostat to the water source heat pump, but can be

monitored and controlled from a third party network.

You must determine which of the following needs troubleshooting:

The W2W Open controller

The mechanical systems of the WSHP unit

The third party connected network

The W2W Open controller can troubleshoot itself with Service Test, communicating LEDs, and built-in alarms. See

the unit's Controls and Troubleshooting instructions.

Disconnecting the W2W 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. When disconnected from the

unit control inputs, you can use simple 24V signals to activate G, Y1, Y2, W1, W2, etc. to verify proper unit

operation. If the problem occurs without the W2W Open connected, then you should begin troubleshooting the

unit/equipment rather than the W2W Open or network.

LED's

The LEDs indicate if the controller is speaking to the other devices on the network. The LEDs should reflect

communication traffic based on the baud rate set. The higher the baud rate, the more solid the LEDs will appear.

The LED's on the W2W Open show the status of certain functions.

If this LED is on... Status is...

Power The W2W Open has power.

Rx The W2W Open is receiving data from the network segment

Tx The W2W Open is transmitting data over the network segment

BO# The binary output is active

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

The Run and Error LED's indicate controller and network status.

If Run LED shows... And Error LED shows... Status is..

2 flashes per second Off Normal

2 flashes per second 2 flashes,

alternating with Run LED

Five minute auto-restart delay after

system error

2 flashes per second 3 flashes, then off Controller has just been formatted

Troubleshooting the W2W Open

Troubleshooting the W2W Open

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If Run LED shows... And Error LED shows... Status is..

2 flashes per second On Two or more devices on this network

have the same network address

2 flashes per second On Firmware halted after frequent

system errors or control programs

halted

5 flashes per second Off Firmware transfer in progress, Boot is

running

7 flashes per second 7 flashes per second,

alternating with Run LED

Ten second recovery period after

brownout

14 flashes per second 14 flashes per second, alternating with

Run LED

Brownout

On On Failure. Try the following solutions:

Turn the W2W Open off, then

on.

Replace the W2W Open.

Compliance

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34

FCC 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.

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

void the users authority to operate the equipment.

CE Compliance

WARNING 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 Compliance

Compliance of listed products to requirements of ASHRAE Standard 135 is the responsibility of BACnet

International. BTL is a registered trademark of BACnet International.

Compliance

Appendix A: Network Points List for W2W Open

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35

Third party access to BACnet points in a controller

BACnet system points in the i-Vu Open controllers match physical I/O points to data, such as Outside Air Temp,

to be written to the controller through the network, rather than by using a local hardwired sensor.

When a BACnet system point is written to, the controller uses the network value, even when there is a local

sensor, as long as it is within the Min/Max refresh times noted below.

BACnet writes to system points

The following table lists all of the writeable system points that could be present in an i-Vu Open controller. The

list of points is application-specific, therefore not all points are present in all i-Vu Open controllers. This

information applies whether the system point is being accessed by another i-Vu Open controller or by a third

party system.

In the i-Vu interface, select the controller in the navigation tree and go to Properties > BACnet Objects tab. When

an i-Vu Open controller or a third party system writes to any of the system points, you must use BACnet Priority

Level 16 and the value must not be written to or refreshed more than once per minute (60 seconds).

CAUTION If any other Priority Level is used, the value will not be recognized by the controller.

BACnet System

Points Display

Name

Valid Range BACnet/

Modbus

/N2 Default Value*

LonWorks

Default Value*

Recommended Write

Rrefresh

Time

(min/max)

System Space

Temperature

-50 150F -999 ~180F 1 min/5 min

System Space RH 1 100% -999 -15.96 5 min / 10 min

System Space AQ 200 9999 ppm -999 64537 5 min / 10 min

System OA

Temperature

-50 150F -999 ~180F 5 min / 60 min

[OA] Enthalpy

(BACnet)

High (0) / Low (1) Low (1) Low (1) On change of state

System Outdoor AQ 200 9999 ppm -999 -999 5 min / 60 min

System Water

Temperature

-50 150F -999 ~180F 5 min / 60 min

System

Fire/Smoke

Inactive (0) / Active (1) Inactive (0) N/A On change of state

System Inactive (0) / Active (1) Inactive (0) N/A On change of state

Appendix A: Network Points List for W2W Open

Appendix A: Network Points List for W2W Open

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Integration Guide All rights reserved

36

BACnet System

Points Display

Name

Valid Range BACnet/

Modbus

/N2 Default Value*

LonWorks

Default Value*

Recommended Write

Rrefresh

Time

(min/max)

Pressurization

Occupancy control

configuration

1 = Always Occupied

2 = BACnet Schedule

(WebCTRL only)

3 = BAS On/Off (third

party control)*

4 = Remote Occ Input

1 = Always

Occupied

(Only available

through BACnet)

N/A N/A

BAS On/Off*

(Occupancy)

Occupancy control

configuration ust be

set for 3 = BAS

On/Off

1=Inactive

2=Occupied

3=Unoccupied

Inactive (1) Inactive (1) On change of state

* Modbus, N2, and LonWorks default values only apply to multi-protocol controllers.

Points do not apply to multi-protocol controllers.

Reading System Points

To verify that the system point is being written to within the refresh time specified (value varies by point), the i-

Vu Open controller clears any value that is written, once it has been processed by the controller and returned

the system point to its default value. Therefore, a BAS should never read back the system point's value to confirm

the commanded value was successfully received. To confirm a write, refer to the table below for the corresponding

control point that should be read.

NOTE A confirming read should take place at least 30 seconds following the write to verify that the write has

been processed by the controller.

Commanded Points Control Points

Display Name Type /

Instance Object Name Display Name

Type /

Instance Object Name

System Space

Temperature

av:1902 system_spt Space Temperature

- Prime Variable

av:2007 space_temp

System Space

RH

av:1904 system_rh Space Relative

Humidity

av:1011 space_rh

System Space

AQ

av:1903 system_iaq Indoor Air Quality

CO2 (ppm)

av:1009 iaq

System OA

Temperature

av:1901 system_oat Outdoor Air

Temperature

av:1003 oa_temp

Appendix A: Network Points List for W2W Open

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Integration Guide All rights reserved

37

Commanded Points Control Points

Display Name Type /

Instance Object Name Display Name

Type /

Instance Object Name

[OA] Enthalpy

(BACnet)

bv:1901 oae [OA] Enthalpy

Status

bv:1002 enthalpy_status

System Outdoor

AQ

av:1908 system_oaq Outdoor Air Quality

CO2 (ppm)

av:1012 oaq

System Water

Temperature

av:1905 system_water_t

emp

Changeover Mode av:1014 chgovr_mode

System

Fire/Smoke

bv:1907 fire_shutdown Fire/Smoke

Shutdown

bv:7007 fire_alarm

System

Pressurization

bv:1906 press_override Pressurization bv:7038 press_alarm

BAS On/Off

[Occupancy]

msv:1001 keypad_ovrde Occupancy Status bv:2008 occ_status

Points do not apply to multi-protocol controllers.

Appendix A: Network Points List for W2W Open

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Integration Guide All rights reserved

38

Network points list for BACnet and Modbus

BACnet Modbus

Point Name Point

Access

Units Default Value BACnet Point Name BACnet Object

ID

Modbus

Register

Type

Modbus

Register #

Active Compressor

Stages

R no units comp_stages AV:2020 Input

Register

(Float)

31

Chilled Water

Supply Setpoint

R/W F 44 chws_setpoint AV:3024 Holding

Register

(Float)

1

Compressor

Capacity

R % comp_cap AV:5001 Input

Register

(Float)

165

Cooling Lockout

Temperature

R/W F 45 oat_cl_lockout AV:9002 Holding

Register

(Float)

43

Effective Cool

Setpoint

R F eff_cl_stpt AV:3005 Input

Register

(Float)

55

Effective Heat

Setpoint

R F eff_ht_stpt AV:3006 Input

Register

(Float)

57

Entering Load

Water Temp

R F ent_load_wtr_temp AV:1019 Input

Register

(Float)

35

Heating Lockout

Temperature

R/W F 65 oat_ht_lockout AV:9003 Holding

Register

(Float)

69

Leaving Load Water

Temp

R F lvg_load_wtr_temp AV:1020 Input

Register

(Float)

39

Maximum OA CHW

Reset

R/W F 10 max_cw_reset AV:9037 Holding

Register

(Float)

49

Outdoor Air

Temperature

R F oa_temp AV:1003 Input

Register

(Float)

87

Power Fail Restart

Delay

R/W seconds 5 start_delay AV:9007 Holding

Register

(Float)

127

Space Relative

Humidity

R %rh space_rh AV:1011 Input

Register

(Float)

103

System Entering

Load Water Temp

R/W deg -999 system_elwt AV:1910 Holding

Register

(Float)

79

System Entering

Source Water Temp

R/W deg -999 system_ecwt AV:1911 Holding

Register

(Float)

77

System OAT Master R F mstr_oa_temp AV:80001 Input

Register

(Float)

91

System Outdoor Air

Temperature

R/W F -999 system_oat AV:1901 Holding

Register

(Float)

119

Appendix A: Network Points List for W2W Open

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Integration Guide All rights reserved

39

BACnet Modbus

Point Name Point

Access

Units Default Value BACnet Point Name BACnet Object

ID

Modbus

Register

Type

Modbus

Register #

System T1

Temperature

R/W F -999 system_t1_temp AV:1909 Holding

Register

(Float)

95

Total System Cmpr

Capacity

R % total_comp_cap AV:5002 Input

Register

(Float)

113

Cool Enable R/W (0) Disable

(1) Enable

Active (1) cl_enable BV:1011 Coil 36

Cooling Setpoint OA

Reset

R/W (0) Disable

(1) Enable

Inactive (0) clg_stpt_oa_rst_ena BV:1023 Coil 2

Entering Load

Water Temp Sensor

R (0) Normal

(1) Alarm

ent_lwt_fail BV:7041 Discrete

Input

11

Entering Load

Water Temperature

R (0) Normal

(1) Alarm

elwt_alarm BV:7040 Discrete

Input

10

Heat Enable R/W (0) Disable

(1) Enable

Active (1) ht_enable BV:1012 Coil 37

Heating Setpoint OA

Reset

R/W (0) Disable

(1) Enable

Inactive (0) htg_stpt_oa_rst_ena BV:1024 Coil 3

Leaving Load Water

Temperature

R (0) Normal

(1) Alarm

llwt_alarm BV:7043 Discrete

Input

15

Leaving Source

Water Temp Sensor

R (0) Normal

(1) Alarm

lvg_cwt_fail BV:7042 Discrete

Input

14

Load Water Pump R (0) Off

(1) On

load_pump BV:1019 Discrete

Input

8

Occupancy Status R (0) Unoccupied

(1) Occupied

occ_status BV:2008 Discrete

Input

18

Outdoor Air

Temperature

R (0) Normal

(1) Alarm

oat_alarm BV:7036 Discrete

Input

19

RH Cooling Setpoint

Reset

R/W (0) Normal

(1) Alarm

Inactive (0) rh_clg_stpt_rst BV:1020 Coil 5

Shutdown R/W (0) Normal

(1) Alarm

Inactive (0) shutdown BV:9001 Coil 1

Source Water Pump R (0) Off/Close

(1) On/Open

pump_iso_vlv BV:1021 Discrete

Input

3

Source Water

Temperature

R (0) Normal

(1) Alarm

cwt_alarm BV:7027 Discrete

Input

61

Space Relative

Humidity

R (0) Normal

(1) Alarm

sprh_hi_alarm BV:7018 Discrete

Input

34

Space Relative

Humidity Sensor

R (0) Normal

(1) Alarm

sprh_sensor_fail BV:7022 Discrete

Input

45

SPT Sensor R (0) Normal

(1) Alarm

spt_sensor_fail BV:7032 Discrete

Input

38

System T1 Sensor R (0) Normal

(1) Alarm

t1_fail BV:7046 Input

Register

(Signed)

28

BAS On / Off R/W (1) Inactive

(2) Occupied

(3) Unoccupied

2 keypad_ovrde MSV:1001 Holding

Register

(Signed)

133

Appendix A: Network Points List for W2W Open

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Integration Guide All rights reserved

40

BACnet Modbus

Point Name Point

Access

Units Default Value BACnet Point Name BACnet Object

ID

Modbus

Register

Type

Modbus

Register #

System Mode R (1) Off

(2) Fan Only

(3) Economize

(4) Cooling

(5) Heating

(6) Cont Fan

(7) Test

(8) Start Delay

(9) Temer SAT

(10) Safety

Shutdown

(11) Shutdown

(12) IAQ

Override

(13)

Dehumidify

(15) Pump Only

run_status MSV:2002 Input

Register

(Signed)

1

Hot Water Supply

Setpoint

R/W F 120 hws_setpoint AV:3023 Holding

Register

(Float)

3

System Leaving

Load Water Temp

R/W deg -999 system_llwt AV:1912 Holding

Register

(Float)

81

Leaving Load Water

Temp Sensor

R (0) Normal

(1) Alarm

lvg_lwt_fail BV:7044 Discrete

Input

16

Leaving Source

Water Temp

R F cwl_temp AV:1017 Input

Register

(Float)

167

Outdoor Air Temp

Sensor

R (0) Normal

(1) Alarm

oat_fail BV:7029 Discrete

Input

27

Maximum OA HW

Reset

R/W F 20 max_hw_reset AV:9038 Holding

Register

(Float)

59

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

Register

(Float)

151

Water Temperature

Setpoint

R F eff_stpt AV:3016 Input

Register

(Float)

115

Occ Relative

Humidity Setpoint

R/W %rh 60 occ_dehum_stpt AV:3011 Holding

Register

(Float)

83

Total Req Sys Comp

Stgs

R no units total_comp_stg AV:88001 Input

Register

(Float)

111

ZS Sensor

Configuration

R (0) Normal

(1) Alarm

zs_config_fail BV:7055 Discrete

Input

63

Compressor Status R (0) Normal

(1) Alarm

comp_alarm BV:7013 Discrete

Input

30

Loop Pump Status R (0) Off

(1) On

loop_pump BV:2702

Source Water Flow R (0) Normal

(1) Alarm

sw_flow_alarm BV:7049 Discrete

Input

65

Load Water Flow R (0) Normal

(1) Alarm

load_flow_alarm BV:7057 Discrete

Input

64

System Entering

Source Water Temp

Fail

R (0) Normal

(1) Alarm

sys_ecwt_fail BV:7045

Appendix A: Network Points List for W2W Open

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Integration Guide All rights reserved

41

BACnet Modbus

Point Name Point

Access

Units Default Value BACnet Point Name BACnet Object

ID

Modbus

Register

Type

Modbus

Register #

System Cooling

Demand Level

R no units cool_demand_level AV:9006

System Heating

Demand Level

R no units heat_demand_level AV:9036

Demand Level 1

Heat Adj

R/W F 3 h_dmd1_adj AV:3020

Source Water

Linkage

R (0) Inactive

(1) Active

cw_link_status BV:2701

Demand Level 1

Cool Adj

R/W F 3 c_dmd1_adj AV:3017

Demand Level 2

Cool Adj

R/W F 3 c_dmd2_adj AV:3018

Demand Level 3

Cool Adj

R/W F 4 c_dmd3_adj AV:3019

Communications

with Master

R (0) Normal

(1) Alarm

mr_comm_fail BV:7047

Demand Level 2

Heat Adj

R/W F 5 h_dmd2_adj AV:3021

Water Loop Temp R F link_cwt AV:2701

Source Water

Linkage

R (0) Normal

(1) Alarm

cond_water_linkage_f

ail

BV:7031

Demand Level 3

Heat Adj

R/W F 7 h_dmd3_adj AV:3022

Load Water Flow

Comm

R (0) Normal

(1) Alarm

load_pmp_comm_fail BV:7056

Loop Pump Request R no units loop_request AV:2024

Source Water Flow

Comm

R (0) Normal

(1) Alarm

src_pmp_comm_fail BV:7058

Equipment Alarm R (0) Normal

(1) Alarm

equip_alarm BV:7048 Discrete

Input

12

Safety R (0) Normal

(1) Alarm

safety_alarm BV:7024 Discrete

Input

43

Fan / Speed R (1) Off

(2) Low

(3) Med

(4) High

(5) On

fan_run MSV:2004 Input

Register

(Signed)

175

Optimal Start Type R/W (1) None

(2) Temp

Compensated

(3) Learning

Adaptive

(2) Temp

Compensated

start_type MSV:2009 Holding

Register

(Signed)

154

Space Temp Source R (1) Sensor

Failure

(2) SPT Sensor

(3) RAT / T55

(4) Network

(5) Airside

Linkage

(6) Locked

Value

(7) T-Stat

Linkage

(8) ZS Sensor

spt_status MSV:2003

Appendix A: Network Points List for W2W Open

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Integration Guide All rights reserved

42

BACnet Modbus

Point Name Point

Access

Units Default Value BACnet Point Name BACnet Object

ID

Modbus

Register

Type

Modbus

Register #

System Mode R (1) Off

(2) Fan Only

(3) Economize

(4) Cooling

(5) Heating

(6) Cont Fan

(7) Test

(8) Start Delay

(9) Temper SAT

(10) Fire

Shutdown

(11) Shutdown

(12) IAQ

Override

(13) Pre-Occ

Purge

run_status MSV:2002 Input

Register

(Signed)

1

Network points list for N2 and LonWorks

N2 LonWorks

Point Name Point

Access

Units Default Value N2 Network

Point Type

N2

Network

Point

Address

SNVT Type SNVT Name

Active

Compressor

Stages

R no units ADF 10 SNVT_count_inc(9) nvoCmpStages

Chilled Water

Supply Setpoint

R/W F 44 ADF 1 SNVT_temp_p(105) nviChilWtrSP

Compressor

Capacity

R % ADF 72 SNVT_lev_percent(81) nvoCmpCap

Cooling Lockout

Temperature

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

Effective Cool

Setpoint

R F ADF 22 SNVT_temp_p(105) nvoEffCoolSP

Effective Heat

Setpoint

R F ADF 23 SNVT_temp_p(105) nvoEffHeatSP

Entering Load

Water Temp

R F ADF 25 SNVT_temp_p(105) nvoEntLdWtr

Heating Lockout

Temperature

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

Leaving Load

Water Temp

R F ADF 27 SNVT_temp_p(105) nvoLvgLdWtr

Maximum OA

CHW Reset

R/W F 10 ADF 34 SNVT_temp_p(105) nviMxOaCWRst

Outdoor Air

Temperature

R F ADF 38 SNVT_temp_p(105) nvoOAT

Appendix A: Network Points List for W2W Open

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Integration Guide All rights reserved

43

N2 LonWorks

Point Name Point

Access

Units Default Value N2 Network

Point Type

N2

Network

Point

Address

SNVT Type SNVT Name

Active

Compressor

Stages

R no units ADF 10 SNVT_count_inc(9) nvoCmpStages

Power Fail

Restart Delay

R/W seconds 5 ADF 58 SNVT_time_sec(107) nviUntStrDly

Space Relative

Humidity

R %rh ADF 46 SNVT_lev_percent(81) nvoSpaceRH

System Entering

Load Water

Temp

R/W deg -999 ADF 52 SNVT_temp_p(105) nviEntLdWtr

System Entering

Source Water

Temp

R/W deg -999 ADF 51 SNVT_temp_p(105) nviSyEntCdWt

System OAT

Master

R F ADF 55 SNVT_temp_p(105) nvoOATMstr

System Outdoor

Air Temperature

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

System T1

Temperature

R/W F -999 ADF 57 SNVT_temp_p(105) nviSysT1Temp

Total System

Cmpr Capacity

R % ADF 65 SNVT_lev_percent(81) nvoSysCmpCap

Cool Enable R/W (0) Disable

(1) Enable

Active (1) BO 36 SNVT_switch(95) nviClEnb

Cooling Setpoint

OA Reset

R/W (0) Disable

(1) Enable

Inactive (0) BO 2 SNVT_switch(95) nviClSpOARst

Entering Load

Water Temp

Sensor

R (0) Normal

(1) Alarm

BI 11 SNVT_switch(95) nvoELWtmpSen

Entering Load

Water

Temperature

R (0) Normal

(1) Alarm

BI 10 SNVT_switch(95) nvoLdWtrAlm

Heat Enable R/W (0) Disable

(1) Enable

Active (1) BO 37 SNVT_switch(95) nviHtEnb

Heating Setpoint

OA Reset

R/W (0) Disable

(1) Enable

Inactive (0) BO 3 SNVT_switch(95) nviHtSPOARst

Leaving Load

Water

Temperature

R (0) Normal

(1) Alarm

BI 15 SNVT_switch(95) nvoLvgLwtAlm

Leaving Source

Water Temp

Sensor

R (0) Normal

(1) Alarm

BI 14 SNVT_switch(95) nvoLvgCWTFl

Load Water

Pump

R (0) Off

(1) On

BI 8 SNVT_switch(95) nvoLdWtrPmp

Occupancy

Status

R (0) Unoccupied

(1) Occupied

BI 18 SNVT_switch(95) nvoOccStatus

Outdoor Air

Temperature

R (0) Normal

(1) Alarm

BI 19 SNVT_switch(95) nvoOatAlm

RH Cooling

Setpoint Reset

R/W (0) Normal

(1) Alarm

Inactive (0) BO 5 SNVT_switch(95) nviRHClSPRst

Shutdown R/W (0) Normal

(1) Alarm

Inactive (0) BO 1 SNVT_switch(95) nviShutdown

Source Water

Pump

R (0) Off/Close

(1) On/Open

BI 3 SNVT_switch(95) nvoCndWtrPmp

Appendix A: Network Points List for W2W Open

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Integration Guide All rights reserved

44

N2 LonWorks

Point Name Point

Access

Units Default Value N2 Network

Point Type

N2

Network

Point

Address

SNVT Type SNVT Name

Active

Compressor

Stages

R no units ADF 10 SNVT_count_inc(9) nvoCmpStages

Source Water

Temperature

R (0) Normal

(1) Alarm

BI 61 SNVT_switch(95) nvoCWTempAlm

Space Relative

Humidity

R (0) Normal

(1) Alarm

BI 34 SNVT_switch(95) nvoHiSPRHAlm

Space Relative

Humidity Sensor

R (0) Normal

(1) Alarm

BI 45 SNVT_switch(95) nvoSpRHSenr

SPT Sensor R (0) Normal

(1) Alarm

BI 38 SNVT_switch(95) nvoSptSnsFl

System T1

Sensor

R (0) Normal

(1) Alarm

BI 28 SNVT_switch(95) nvoSysT1Fail

BAS On / Off R/W (1) Inactive

(2) Occupied

(3) Unoccupied

2 ADI 1 SNVT_count_inc(9) nviBASOnOff

System Mode R (1) Off

(2) Fan Only

(3) Economize

(4) Cooling

(5) Heating

(6) Cont Fan

(7) Test

(8) Start Delay

(9) Temper SAT

(10) Safety

Shutdown

(11) Shutdown

(12) IAQ

Override

(13)

Dehumidify

(14) Pump Only

ADI 13 SNVT_count_inc(9) nvoOpMode

Hot Water

Supply Setpoint

R/W F 120 ADF 2 SNVT_temp_p(105) nviHotWtrSP

System Leaving

Load Water

Temp

R/W deg -999 ADF 53 SNVT_temp_p(105) nviLvgLdWtr

Leaving Load

Water Temp

Sensor

R (0) Normal

(1) Alarm

BI 16 SNVT_switch(95) nvoLvgLwtFl

Leaving Source

Water Temp

R F ADF 73 SNVT_temp_p(105) nvoLvgCWTemp

Outdoor Air

Temp Sensor

R (0) Normal

(1) Alarm

BI 27 SNVT_switch(95) nvoOatFail

Maximum OA

HW Reset

R/W F 20 ADF 35 SNVT_temp_p(105) nviMxOaHWRst

System Space

RH

R/W % -999 ADF 40 SNVT_lev_percent(81) nviSysSpRH

Water

Temperature

Setpoint

R F ADF 66 SNVT_temp_p(105) nvoWtrTempSP

Occ Relative

Humidity

Setpoint

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

Appendix A: Network Points List for W2W Open

W2W Open CARRIER CORPORATION 2021

Integration Guide All rights reserved

45

N2 LonWorks

Point Name Point

Access

Units Default Value N2 Network

Point Type

N2

Network

Point

Address

SNVT Type SNVT Name

Active

Compressor

Stages

R no units ADF 10 SNVT_count_inc(9) nvoCmpStages

Total Req Sys

Comp Stgs

R no units ADF 64 SNVT_temp_p(105) nvoTlRqCpStg

ZS Sensor

Configuration

R (0) Normal

(1) Alarm

BI 63 SNVT_switch(95) nvoZsCfgFail

Compressor

Status

R (0) Normal

(1) Alarm

BI 30 SNVT_switch(95) nvoCmpSafety

Source Water

Flow

R (0) Normal

(1) Alarm

BI 65 SNVT_switch(95) nvoSWFlowAlm

Load Water Flow R (0) Normal

(1) Alarm

BI 64 SNVT_switch(95) nvoLWFlowAlm

Equipment

Alarm

R (0) Normal

(1) Alarm

BI 12 SNVT_switch(95) nvoEquipAlm

Safety R (0) Normal

(1) Alarm

BI 43 SNVT_switch(95) nvoSftyChain

Appendix B: BACnet Protocol Implementation Conformance Statement

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Integration Guide All rights reserved

46

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.

Appendix B: BACnet Protocol Implementation Conformance Statement

Appendix C: Modbus Protocol Implementation Conformance Statement

W2W Open CARRIER CORPORATION 2021

Integration Guide All rights reserved

47

Date: 11/12/2013

Vendor Name: Carrier

Product Names: W2W Open

Product Model Number: #OPN-WSHPW2WM

Protocol Description:

The W2W 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 W2W Open is a factory-installed rooftop controller that is capable of speaking multiple protocols.

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,

38400, 76800

8 None 1

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

Register Type: Range: Function Codes Used with this

Register Type:

Float Value (FLOAT) Single-Precision IEEE floating point

value

3 Read Holding Register

6 Preset Single Register

16 Preset Multiple Register

Appendix C: Modbus Protocol Implementation Conformance Statement

Appendix C: Modbus Protocol Implementation Conformance Statement

W2W Open CARRIER CORPORATION 2021

Integration Guide All rights reserved

48

Unsigned Integer (UINT) 0 - 65535

3 Read Holding Register

6 Preset Single Register

16 Preset Multiple Register

Signed Integer (SINT) -32768 - 32767

3 Read Holding Register

6 Preset Single Register

16 Preset Multiple Register

Discrete Input (DI) 0 = Off, 1 = On 2 Read Input Status

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

1 Read Coil Status

5 Force Single Coil

15 Force Multiple Coils

Appendix D: Johnson N2 Protocol Implementation Conformance Statement

W2W Open CARRIER CORPORATION 2021

Integration Guide All rights reserved

49

Vendor Name: Carrier

Product Names: W2W Open

Product Model Number: #OPN-WSHPW2WM

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 W2W Open is a factory-installed rooftop controller that is capable of speaking multiple protocols. The W2W

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.

Communication Types: Baud

rates: Data Bits: Parity: Stop Bits:

2-wire EIA-485 9600 8 None 1

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

Appendix D: Johnson N2 Protocol Implementation Conformance Statement

Appendix D: Johnson N2 Protocol Implementation Conformance Statement

W2W Open CARRIER CORPORATION 2021

Integration Guide All rights reserved

50

Write Binary Output

Write Internal Parameter

Override Analog Input

Override Binary Input

Override Internal Parameter

Override Release Request

Appendix E: LonWorks Protocol Implementation Conformance Statement

W2W Open CARRIER CORPORATION 2021

Integration Guide All rights reserved

51

Date: 10/09/2012

Vendor Name: Carrier

Product Names: W2W Open

Product Model Number: #OPN-WSHPW2WM

Product Description:

The W2W 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 W2W Open to communicate over a LonTalk

network. The W2W 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 W2W 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 controller, a separate

LonWorks Option Card (LON-OC) was designed to connect to the W2W Open.

This accessory card must be ordered separately and is connected by attaching its ribbon cable into the J15

connector on the W2W Open. The W2W Opens baud rate (1 and 2 on SW3) must be set to 38.4k to communicate

with the LON-OC. The address switches (SW1 and SW2) are not used with LonWorks.

Tranceiver Type: TP/FT 10

Appendix E: LonWorks Protocol Implementation Conformance Statement

Document revision history

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Integration Guide All rights reserved

52

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

listed.

Date Topic Change description Code*

11/20/19 Appendix A: Network Points List >

Third party access to BACnet points in

a controller

New topic C-TS-JN-E-RD

5/22/18 Troubleshooting BACnet MS/TP

Troubleshooting ARC156

Corrected BACnet Device Instance number C-TS-RD-F

1/9/18 Network points list for N2 and

LonWorks

Updated C-AE-BR-E

2/8/17 Wiring inputs and outputs Added Wireless sensors and references to appropriate sensor

guides.

C-AE-WB-O

Sequence of operation - Linkage air

source mode determination

Clarified reason and method for generating a particular mode.

Evacuation/Shutdown changed to Evacuation.

C-AE-WB-E

BACnet ARC156 Added instructions C-D

All Troubleshooting sections Reformatted and information on Static Binding removed since

we only use Dynamic Binding now.

C-D

2/23/16 Start-up Added USB Link wiring caution C-TS-RD-E-JH

5/27/15 To wire inputs and outputs Correction - added ZS sensors C-TS-RD-E-WB

3/10/15

Start-up Removed BACview and added Equipment Touch and System

Touch

C-AE-BR-O-WB

Adjusting MS/TP properties using an

Equipment Touch

New topic C-AE-BR-O-WB

Appendix A: Network points list for

W2W Open

Network points list updated for BACnet, Modbus, N2, and

LonWorks

C-AE-BR-O-WB

Entire document All references to BACview removed and Equipment Touch

added.

C-AE-BR-O-WB

6/5/14 Configuring for BACnet MS/TP Added note that controller counts as a full load on the MS/TP

bus.

C-TS-RD-E

* For internal use only

Document revision history

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