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Carrier Aquazone 50PSW Integration Guide PDF
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.
Communications wiring
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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.
Communications wiring
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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.
Communications wiring
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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.
Communications wiring
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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.
Communications wiring
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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.
Communications wiring
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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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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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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
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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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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
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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
W2W Open CARRIER CORPORATION 2021
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
W2W Open CARRIER CORPORATION 2021
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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