MicroTech II™ Chiller Unit Controller Protocol Information...Page 4 ED 15063-0 Introduction This...

MicroTech II™ Chiller Unit Controller Protocol Information

MODBUS® Protocol

• WSC Water-Cooled Centrifugal, Single-Compressor• WDC Water-Cooled Centrifugal, Dual-Compressor• WPV Water-Cooled Centrifugal, Single-Compressor• AGZ Air-Cooled Global Scroll, Single- and Dual-Circuit• ACZ Air-Cooled Scroll Condensing Unit, Single- and Dual-Circuit• WGZ Water-Cooled Global Scroll• AGS Air-Cooled Global Screw

Engineering Data ED 15063-0

Group: Controls

Part Number: ED15063-0

Date: May 2003

Supersedes: New

© 2003 McQuay International

ED 15063-0

Table of ContentsReference Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Chiller Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Controller Data Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4MODBUS Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Protocol Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Valid Function Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Valid Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6MODBUS Data Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Example Data Point: Chiller On Off. . . . . . . . . . . . . . . . . . . . . . . . 6Configuring the Unit Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Typical Minimum Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Set up the Unit for Network Control. . . . . . . . . . . . . . . . . . . . . . . . 7Display Important Data Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Comprehensive Data Point Tables . . . . . . . . . . . . . . . . . . . . . . . 8MODBUS Data Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Detailed Data Point Information . . . . . . . . . . . . . . . . . . . . . . . 10Active Setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Actual Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Capacity Limit Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Capacity Limit Setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Chiller Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Chiller Limited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Chiller Local/Remote . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Chiller Mode Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Chiller Mode Setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Chiller On Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Chiller Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Compressor Discharge Temperature . . . . . . . . . . . . . . . . . . . . . . 12Compressor Percent RLA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Compressor Run Hours . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Compressor Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Compressor Starts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Compressor Suction Line Temperature . . . . . . . . . . . . . . . . . . . . 14Condenser Entering Water Temperature . . . . . . . . . . . . . . . . . . . 14Condenser Flow Switch Status . . . . . . . . . . . . . . . . . . . . . . . . . . 14Condenser Leaving Water Temperature . . . . . . . . . . . . . . . . . . . 14

Condenser Pump Run Hours . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Condenser Refrigerant Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 14Condenser Saturated Refrigerant Temperature . . . . . . . . . . . . . . 14Condenser Water Flow Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Condenser Water Pump Status . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Cool Setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Evaporator Entering Water Temperature . . . . . . . . . . . . . . . . . . . 15Evaporator Flow Switch Status . . . . . . . . . . . . . . . . . . . . . . . . . . 15Evaporator Leaving Water Temperature for Unit . . . . . . . . . . . . 15Evaporator Leaving Water Temperature for Compressor . . . . . . 15Evaporator Pump Run Hours . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Evaporator Refrigerant Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 16Evaporator Saturated Refrigerant Temperature . . . . . . . . . . . . . . 16Evaporator Water Flow Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Evaporator Water Pump Status . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Heat Recovery Entering Water Temperature . . . . . . . . . . . . . . . . 16Heat Recovery Leaving Water Temperature . . . . . . . . . . . . . . . . 16Heat Setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Ice Setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Liquid Line Refrigerant Pressure . . . . . . . . . . . . . . . . . . . . . . . . . 17Liquid Line Refrigerant Temperature . . . . . . . . . . . . . . . . . . . . . . 17Oil Feed Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Oil Feed Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Oil Sump Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Oil Sump Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Outdoor Air Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Pump Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Run Enabled. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Alarm Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Fault Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Problem Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Warning Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Alarm Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Alarm Digital Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Clear Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Active Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Limited WarrantyConsult your local McQuay Representative for warranty details. Refer to Form 933-43285Y. To find your local McQuay Representative, go to www.mcquay.com.

Software RevisionThis edition documents all versions of the standard MicroTech IIô Chiller Unit Controller firmware and all subsequent revi-sions until otherwise indicated.

Notice© 2003 McQuay International, Minneapolis MN. All rights reserved throughout the world.

McQuay International reserves the right to change any infor-mation contained herein without prior notice. The user is responsible for determining whether this product is appropriate for his or her application.

™ ® The following are trademarks or registered trademarks of their respective companies. ModBus is a registered trademark of Gould, Inc. Windows is a registered trademark of Microsoft Corporation. McQuay registered is a trademark and MicroTech II is a trademark of McQuay International.

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Reference Documents

Notes: 1. McQuay International documents are available at http://www.mcquay.com/

2. Revisions were current at time of release.

Number Company TitleIOMM WSCWDC-2 McQuay International MicroTech II Self-Contained Unit Controller Installation ManualOM CentrilfMicro II McQuay International MicroTech II Controller for Centrifugal Chillers Operating ManualOM AGS-1 McQuay International MicroTech II Controller for AGS Chillers Operating Manual

IM 743 McQuay International MicroTech II Chiller Unit Controller MODBUS Serial Communication Module

IMM AGS-1 McQuay International MicroTech II Air-Cooled Screw Chiller Installation and Maintenance Manual

IOMM ACZ/AGZ-3 McQuay International MicroTech II Air-Cooled Condensing Unit Installation, Operation, and Maintenance Manual

IOMM ACZ1 McQuay International MicroTech II Air-Cooled Condensing Unit Installation, Operation, and Maintenance Manual

IOMM AGZ-4 McQuay International MicroTech II Air-Cooled Scroll Chiller Installation, Operation, and Maintenance Manual

IOMM WGZ-1 McQuay International MicroTech II Water-Cooled Scroll Chiller Installation Manual

IOMM WPV McQuay International MicroTech II Centrifugal Chiller Installation, Operation, and Maintenance Manual

IOMM WSCWDC-2 McQuay International MicroTech II Chiller Unit Controller Installation, Operation, and Maintenance Manual

OM AGS-2 McQuay International MicroTech II Air-Cooled Screw Chiller Operating Manual

OM CentrilfMicro II McQuay International MicroTech II Unit Controller for Centrifugal Chillers and Templifiers Operating Manual

http://www.modbus.org MODBUS Application Protocolhttp://www.modbus.org MODBUS Over Serial Line

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IntroductionThis document contains the necessary information to incorporate a MicroTech II™ Chiller Unit Controller from McQuay Interna-tional into your Building Automation System (BAS). It includes all necessary MODBUS® variables and corresponding MicroTech II Chiller Unit Controller data points. MODBUS terms and principles are not defined. Refer to the appropriate specifications for definitions and details.

Chiller ModelsThe following table lists the model designators of McQuay International Chiller units and the corresponding description.

Controller Data PointsThe MicroTech II Chiller Unit Controller contains data points or unit variables that are accessible from different user interfaces: the unit keypad/display, the Operator Interface Touch Screen, a MODBUS serial network. Not all points are accessible from each inter-face. This manual lists all important data points and the corresponding network path. Refer to the applicable Operation Manual for keypad/display and Operator Interface Touch Screen details. See Reference Documents on page 3 for manual part numbers.

WSC Water-Cooled Single-Compressor CentrifugalWDC Water-Cooled Dual-Compressor CentrifugalWPV Water-Cooled Single-Compressor CentrifugalAGZ Air-Cooled Global ScrollACZ Air-Cooled Scroll Condensing UnitWGZ Water-Cooled Global ScrollAGS Air-Cooled Global Screw

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MODBUS Protocol

CompatibilityThe MicroTech II Chiller Unit Controller can be configured in an interoperable MODBUS network. The controller must have the corresponding network communication module installed.

The MicroTech II Chiller Unit Controller conforms to the MODBUS Standards published on the MODBUS.ORG website (http://www.modbus.org). See the Reference Documents on page 3.

Protocol DefinitionsThe MODBUS protocol is a standardized Application Level (OSI Level 7) protocol used in interoperable Industrial Control net-works. MODBUS provides the communication infrastructure necessary to integrate products manufactured by different vendors and to integrate control services that are now independent.

It specifies how requests from the client are sent to a server and how servers reply. The client constructs a PDU (protocol data unit) and sends it to a specific server or broadcasts it to all servers. The PDU contains a function code that defines the action the client is requesting from the server(s). The PDU also includes a data field that further defines the action to the server, for example the loca-tion of the data to be read.

A normal reply from a server includes the same function code and a response data field. In the case of a read operation, the response data field contains the requested data. In the case of a write operation, the response data field contains an echo of the write data of the request command.

If the server detects an error in the transmission, the reply to the client includes and exception function code and the response data field contains an exception code.

Controllers can communicate on standard MODBUS networks using one of two transmission modes: ASCII or RTU. Users select the serial port communication parameters (baud rate, parity mode, etc), during configuration of the controller. The mode and serial parameters must be the same for all devices on a MODBUS network. Transmission mode determines how information is packed into the message fields and decoded. In RTU mode, each byte contains two hexadecimal characters, and in ASCII mode, each byte contains one ASCII character. The MicroTech II Chiller Unit Controller uses the RTU mode only.

The MicroTech II Chiller Unit Controller uses the following data structure: 8 data bits, 2 stop bits, and no parity bit. It uses data transmission rates from 1200 to 19200 bps.

Valid Function CodesThe MicroTech II Chiller Unit Controller supports eight public function codes.

Function Code Description Definition01 (0x01) Read Coils This function code reads status from 1 to 2000 contiguous coils in a remote device. 02 (0x02) Read Discrete Inputs This function code reads status from 1 to 2000 contiguous discrete inputs in a

remote device. 03 (0x03) Read Holding Registers This function code reads the contents of a contiguous block of holding registers in a

remote device. 04 (0x04) Read Input Registers This function code reads from 1 to approx. 125 contiguous input registers in a

remote device. 05 (0x05) Write Single Coil This function code writes a single output to either ON or OFF in a remote device.06 (0x06) Write Single Register This function code writes a single holding register in a remote device.15 (0x0F) Write Multiple Coils This function code forces each coil in a sequence of coils to either ON or OFF in a

remote device. 16 (0x10) Write Multiple Registers This function code writes a block of contiguous registers (1 to approx. 120 regis-

ters) in a remote device.

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Valid Error CodesThe MicroTech II Chiller Unit Controller supports three error or exception codes.

MODBUS Data PointEach data point accessible from a MODBUS network is described with a table that gives the data type and index. If the data point represents an enumerated variable, the enumerations are also listed.

Example Data Point: Chiller On OffThis output network variable indicates the current state of the chiller. The OFF state is represented by 0, and the ON state is repre-sented by 1. (D2)

Data TypeData is represented as either single-bit elements or 16-bit elements. A single-bit element is referred to as a Discrete Input when it refers to read-only data and as a Coil when it refers to read-write data. A 16-bit element is referred to as an Holding Register when it refers to read-only data and as a Input Register when it refers to read-write data.

IndexThere can be as many as 65,536 elements of each data type in a MODBUS device. Data elements are numbered from 1 to 65,536 in each type. Data elements are addressed with an index in the range from 0 to 65,535. The index is not the address of the data element in the unit controller memory. The index is used in MODBUS PDUs to specify the location the data in the unit controller. This means, for example, that data element number 1 is addressed using index 0 in the PDU.

Valid RangeSome properties are standard data types and some are enumerated sets. If the property value represents a range of values, e.g., tem-perature or pressure, a range of values is given. If the property value is an enumerated set, all enumerated values and corresponding meaning are given.

Configuring the Unit ControllerThe MicroTech II Chiller Unit Controller and the MicroTech II MODBUS Communication Module together are designed, pro-grammed, and configured at the factory to be a chiller unit controller accessible over a MODBUS network. No additional program-ming is required to make this a chiller unit controller. The unit controller is ready to operate with the default values of the various parameters set at the factory. Default values may be changed with the unit keypad or via the network. Parameters must be adjusted to accommodate your particular network. See the appropriate operation manual for default values and keypad operating instructions and the MicroTech MODBUS Communication Module Installation Manual. See Reference Documents for part numbers.

Error Codes Description Definition01 Illegal Function The function code received in the query is not an allowable action for the server (or slave). 02 Illegal Data Address The data address received in the query is not an allowable address for the server (or slave). 03 Illegal Data Value A value contained in the query data field is not an allowable value for server (or slave).

Data Type Index Measurement Units Valid RangeDiscrete Input 2 Chiller State NA 0 = Off

1 = On

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Typical Minimum IntegrationWhen you have integrated the unit into your network, you can monitor and control unit operation from your workstation. At a mini-mum, you can:

• Display and monitor data points• Turn the unit on or off• Operate the unit safely

Note:The following integration details apply to MicroTech II Centrifugal Chillers (Models WSC, WDC, and WPV) only.

Set up the Unit for Network ControlTo setup the MicroTech II Unit Controller for network control1. Disable the chiller. The chiller should not be operating while performing this setup.2. At the unit controller keypad,

a. In the SET UNIT SPs (1) screen, set the setpoint "Source" equal to "Local" . Use the Operator Password of "100".b. In the SET UNIT SPs (1) screen, set the "Enable" setting equal to "Off" .c. In the SET UNIT SPs (13) screen, set the protocol parameters . Use the Manager Password of "2001".

3. Verify with the chiller technician that the chiller is operational.4. At the unit controller keypad,

a. In the SET UNIT SPs (1) screen, set the setpoint "Source" equal to "BAS". Use the Operator Password of "100".

Display Important Data PointsTypical workstation displays of MicroTech II Unit Controller attributes include the following significant data points (page number of detailed description in parenthesis). Each data point is identified with a number that also identifies it in the Comprehensive Data Point Tables. These data points are also shaded in the comprehensive tables so that you can distinguish them . References in the text of this section also identify these data points with a number and shading.

Table 1: Significant Data Points

You can display any number of additional data points based on job requirements or individual preference. See MODBUS Data Points on page 6 for lists of all MODBUS Variables available to the network. For a more detailed description of all available data points, see the Detailed Data Point Information section on page 10 of this document.

No Configuration No Temperatures No Setpoints No Alarms1 Chiller Status (12) 5 Evaporator Enter ing

Water Temperature (15)9 Cool Setpoint (15) 11 Alarm Digital Output

(19)2 Chil ler Mode Set-

point (12)6 Evapora to r Leav ing

Water Temperature (15)10 Capacity Limit Setpoint

(11)12 Clear Alarms (19)

3 Actual Capacity (11) 7 Condense r En te r ing Water Temperature (14)

13 Active Alarms (19)

4 Chiller Enable (11) 8 Condense r Leav ing Water Temperature (14)

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Comprehensive Data Point Tables

MODBUS Data PointsChiller Variables

Note: See the appropriate Operation Manual for specific data ranges and default values.

Network Control Property Page

Read or

Read/Write

Data Type Description

Active Setpoint 11 R Holding Register -40°-199°FActual Capacity (3) 11 R Holding Register 0-160%Capacity Limit (Output) (10) 11 R Holding Register 0-160%Capacity Limit Setpoint (10) 11 W Input Register 0 to 160%; Chiller Enable (Input) (4) 11 R/W Coil 0=Off, 1=On; Chiller Limited 11 R Discrete Input 0=Not Limited, 1=LimitedChiller Local/Remote 12 R Discrete Input 0=Remote, 1=LocalChiller Mode Output 12 R Discrete Input 1=ICE, 2=COOL, 3=HEATChiller Mode Setpoint 12 R/W Input Register 1=ICE, 2=COOL, 3=HEATChiller On Off 12 R Discrete Input 0=Chiller Off, 1=Chiller OnChiller Status (1) 12 R Holding Register 1 = Off, 2 = Start, 3 = Run, 4 = Pre Shutdown, 5 = ServiceCompressor Discharge Temperature 12 R Holding Register -460°-621°FCompressor Percent RLA 13 R Holding Register 0-110% Compressor Run Hours 13 R Holding Register 0 -65,535Compressor Select 13 R/W Input Register See page 13Compressor Starts 13 R Holding Register 0 -65,535Compressor Suction Line Temperature 14 R Holding Register -40°-244°FCondenser Entering Water Temperature (7) 14 R Holding Register -40°-244°FCondenser Flow Switch Status 14 R Discrete Input 0=No Flow, 1=FlowCondenser Leaving Water Temperature (8) 14 R Holding Register -40°-244°FCondenser Pump Run Hours 14 R Holding Register 0 -65,535Condenser Refrigerant Pressure 14 R Holding Register -3276.8-3276.7Condenser Saturated Refrigerant Tempera-ture

14 R Holding Register -40°-244°F

Condenser Water Flow Rate 15 R Holding Register 0 -65,535Condenser Water Pump Status 15 R Discrete Input 0= Pump Off Request, 1=Pump On RequestCool Setpoint (9) 15 R/W Input Register 10 - 120°FEvaporator Entering Water Temperature (5) 15 R Holding Register -40°-244°FEvaporator Flow Switch Status 15 R Discrete Input 0=No Flow, 1=FlowEvaporator Leaving Water Temperature for Unit(6)


Evaporator Leaving Water Temperature for Compressor


Evaporator Pump Run Hours 16 R Holding Register 0 -65,535Evaporator Refrigerant Pressure 16 R Holding Register -3276.8-3276.7Evaporator Saturated Refrigerant Tempera-ture


Evaporator Water Flow Rate 16 R Holding Register 0 -65,535Evaporator Water Pump Status 16 R Discrete Input 0=Pump Off Request, 1=Pump On RequestHeat Recovery Entering Water Temperature 16 R Holding Register -40°-244°FHeat Recovery Leaving Water Temperature 16 R Holding Register -40°-244°FHeat Setpoint 17 R/W Input Register 50-120°F

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Chiller Alarm Variables


Read or

Read/Write


Ice Setpoint 17 R/W Input Register 15 - 35°F, Default=25°FLiquid Line Refrigerant Pressure 17 R Holding Register -22592-22591 psi Liquid Line Refrigerant Temperature 17 R Holding Register -40°-244°FOil Feed Pressure 17 R Holding Register -22592-22591 psi Oil Feed Temperature 17 R Holding Register -40°-244°FOil Sump Pressure 17 R Holding Register -22592-22591 psi Oil Sump Temperature 18 R Holding Register -40°-244°FOutdoor Air Temperature 18 R Holding Register -40°-244°FPump Select 18 R/W Coil 0=Pump No. 1, 1=Pump No. 2Run Enabled 18 R Input Register 0=OFF, 1=Run Allowed


Read or

Read/Write


Alarm Digital Output (11) 19 R Coil 0-No Alarm, 1=AlarmClear Alarms (12) 19 R/W Coil 0=Normal, 1=Clear AlarmActive Alarms (13) 19 R Holding Register 16 Holding Registers: Each bit representing an alarm condition

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Detailed Data Point InformationThis section lists the information (the data) that is available to the Industrial Control System via the MODBUS RTU protocol. This information is used to safely operate and log the performance of the chiller. The systems integrator also uses this information when creating custom graphics.

Table 2: Data Points for Chiller ModelsData Point WSC/WDC/WPV AGZ ACZ WGZ AGSActive Alarms X X X X XActive Setpoint X X X XActual Capacity X X X XAlarm Digital Output X X X X XCapacity Limit Output X X* X* X XCapacity Limit Setpoint X X* X* X XChiller Enable X X X X XChiller Limited X X* X* XChiller Local/Remote X X X X XChiller Mode Output X X X X XChiller Mode Setpoint X X X XChiller On Off X X X X XCompressor Discharge Temperature X XCompressor Percent RLA XCompressor Run Hours X X X X XCompressor Select X X X X XCompressor Starts X X X X XCompressor Suction Line Temperature X X XCondenser Entering Water Temperature XCondenser Flow Switch Status XCondenser Leaving Water Temperature XCondenser Pump Run Hours XCondenser Refrigerant Pressure X X X X XCondenser Saturated Refrigerant Temperature X X X X XCondenser Water Flow Rate XCondenser Water Pump Status XCool Setpoint X X X XEvaporator Entering Water Temperature X XEvaporator Flow Switch Status X X X X XEvaporator Leaving Water Temperature for Compressor XEvaporator Leaving Water Temperature for Unit X X X XEvaporator Pump Run Hours XEvaporator Refrigerant Pressure X X X X XEvaporator Saturated Refrigerant Temperature X X X X XEvaporator Water Flow Rate XEvaporator Water Pump Status X X X XHeat Recovery Entering Water Temperature XHeat Recovery Leaving Water Temperature XHeat Setpoint XIce Setpoint X X X XLiquid Line Refrigerant Pressure XLiquid Line Refrigerant Temperature X XNetwork Clear Alarm X X X X XOil Feed Pressure XOil Feed Temperature XOil Sump Pressure XOil Sump Temperature XOutdoor Air Temperature X X X XPump Select XRun Enabled X X X X* Dual circuit models only

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Active SetpointThis output network variable indicates the current value of the setpoint temperature used to control the temperature of the Leaving Chilled Water or Leaving Hot Water. Based on the operating mode of the chiller, this value is derived from the Cooling Setpoint or the optional Heating Setpoint. The default mode is Cooling and is used unless changed by the Mode input. (A2)

Actual CapacityThis output network variable indicates the percent of capacity the chiller is currently producing. It may be more or less than the nominal capacity of the chiller. (A10)

Capacity Limit OutputThis output variable is a measure of the ratio of operating capacity to full capacity expressed in percent. This level may be adjusted via an operator workstation or other network device, but cannot be adjusted above a factory-specified limit. It indicates the current value of the Capacity Limit (Input) data point. (A42)

Capacity Limit SetpointCapacity Limit is a measure of the ratio of operating capacity to full capacity expressed in percent. The variable can set the operat-ing value (input). This input network variable sets the maximum capacity level of the chiller. This level may be adjusted via an operator workstation or other network device, but cannot be adjusted above a factory-specified limit. (A3).

Chiller EnableThe Chiller Enable data point starts the chiller in a particular way. (D1)

Chiller LimitedThis output network variable indicates the main running mode and states of the Chiller. The Limited network variable indicates whether conditions may exist that prevent the chiller from reaching setpoint. (D6)

Data Type Index Measurement Units Valid RangeHolding Register 40003 Temperature °F x 10 -40°-199°F

Data Type Index Measurement Units Valid RangeHolding Register 40011 Percent of chiller capacity % x 10 0% to 160%

Data Type Index Measurement Units Valid RangeHolding Register 40043 Percent of maximum capacity % x 10 0% to 160%.

Data Type Index Measurement Units Valid RangeInput Register 40004 Percent of maximum capacity % x 10 0% to 160%.

Data Type Index Measurement Units Valid RangeCoil 2 Chiller State NA 0 = Off (disable)

1 = On (enable)

Data Type Index Measurement Units Valid RangeDiscrete Input 7 Status NA 0 = Not Limited

1 = Limited

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Chiller Local/RemoteThe Local/Remote network variable indicates whether the chiller is in local control or allowed to be controlled remotely over the network. (D5)

Chiller Mode OutputThis output data point indicates the current operating mode of the chiller. (I19)

Chiller Mode SetpointThe Chiller Mode data point sets the mode of operation of the chiller and provides the ability for another node on the network to place a chiller in another mode. (I17)

Chiller On OffThis output network variable indicates the current state of the chiller. The OFF state is represented by 0, and the ON state is repre-sented by 1. (D2)

Chiller StatusThis output network variable indicates the main running mode and states of the Chiller. The mode provides the primary running states of a chiller and the state provides an indicator of other conditions present. (I18)

Compressor Discharge TemperatureThis output network variable indicates the current compressor refrigerant temperature of the compressor selected with Compressor Select on page 16. (A19)

Data Type Index Measurement Units Valid RangeDiscrete Input 6 Mode NA 0 = Remote

1 = Local

Data Type Index Measurement Units Valid RangeDiscrete Input 40148 HVAC Mode NA 1. ICE

2. COOL3. HEAT

Data Type Index Measurement Units Valid RangeInput Register 40146 HVAC Mode NA 1. ICE

2. COOL3. HEAT

Data Type Index Measurement Units Valid RangeDiscrete Input 3 Chiller State NA 0 = Off

1 = On

Data Type Index Measurement Units Valid RangeHolding Register 40163 Chiller State NA 1. Off

2. Start3. Run4. Pre Shutdown5. Service


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Compressor Percent RLAThis output network variable indicates the current percent RLA for the compressor motor of the compressor selected with Compres-sor Select on page 16. (A25)

Compressor Run HoursThis output network variable indicates the number of hours that the compressor motor of the compressor selected with Compressor Select on page 16 has been turned on. (I46)

Note: Value returned must be multiplied by 10 to give run hours.

Compressor SelectThis input network variable selects the compressor (number 1, 2, 3 or 4) that is interrogated. The controller returns the information for the selected compressor. You must first select a compressor then interrogate the selected compressor. This variable selects a compressor for the following variables. (I32)

Compressor StartsThis output network variable indicates the number of times the compressor motor of the compressor selected with Compressor Select on page 13 has been started. (I45)

Data Type Index Measurement Units Valid RangeHolding Register 40026 Percent RLA % x 10 0 -110%

Data Type Index Measurement Units Valid RangeHolding Register 40175 Time hours/10 0 -65,535

Name PageCompressor Discharge Temperature 12Compressor Percent RLA 13Compressor Run Hours 13Compressor Starts 13Compressor Suction Line Temperature 14Condenser Refrigerant Pressure 14Condenser Saturated Refrigerant Temperature 14Evaporator Leaving Water Temperature for Compressor 15Evaporator Refrigerant Pressure 16Evaporator Saturated Refrigerant Temperature 16Oil Feed Pressure 17Oil Feed Temperature 17Oil Sump Pressure 17Oil Sump Temperature 18

Data Type Index Measurement Units Valid RangeHolding Register 40161 Event Count NA 0 -65,535

Data Type Index Measurement Units Valid RangeInput Register 40174 Count Starts 0 -65,535

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Compressor Suction Line TemperatureThis output network variable indicates the current suction line refrigerant temperature. There is a separate output for each compres-sor. See Compressor Select on page 13. (A15)

Condenser Entering Water TemperatureThis output network variable indicates the current temperature of the entering condenser water. (A7)

Condenser Flow Switch StatusThis output network variable indicates the status of the water flow through the condenser. (D8)

Condenser Leaving Water TemperatureThis output network variable indicates the current temperature of the leaving condenser water. (A8)

Condenser Pump Run HoursThis output network variable indicates the number of hours that the selected condenser pump motor has been turned on. See Pump Select on page 18. (I48)

Condenser Refrigerant PressureThis output network variable indicates the current refrigerant pressure in the selected condenser. There is a separate output for each compressor. See Compressor Select on page 13. (A21)

Condenser Saturated Refrigerant TemperatureThis output network variable indicates the current saturated refrigerant temperature in the condenser. There is a separate output for each compressor. See Compressor Select on page 13. (A20)



Data Type Index Measurement Units Valid RangeDiscrete Input 9 Flow State NA 0 = No Flow

1 = Flow


Data Type Index Measurement Units Valid RangeHolding Register 40177 Time hours 0 -65,535

Data Type Index Measurement Units Valid RangeHolding Register 40022 Pressure (gauge) psi -22592-22591 psi


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Condenser Water Flow RateThis output network variable indicates the rate of water flow through the condenser. (A24)

Condenser Water Pump StatusThis output network variable indicates whether the selected pump has been commanded On or Off. See Pump Select on page 18. (D31)

Cool SetpointThis input property sets the temperature of the Leaving Chilled Water when the chiller is operating in the Cooling Mode. The Cool-ing mode is the normal mode of chiller operation, unless overridden by using the optional Mode variable to change to another mode. (A1)

Note: See the appropriate Operation Manual for specific data range and default value.

Evaporator Entering Water TemperatureThis output attribute indicates the temperature of the evaporator entering water temperature. (A4)

Evaporator Flow Switch StatusThis output network variable indicates the status of water flow through the evaporator. (D7)

Evaporator Leaving Water Temperature for UnitThis output network variable indicates the current temperature of the Evaporator leaving chilled water. (A6)

Evaporator Leaving Water Temperature for CompressorThis output network variable indicates the current temperature of the Evaporator leaving chilled water temperature of the compres-sor selected with Compressor Select on page 13. (A14)

Data Type Index Measurement Units Valid RangeHolding Register 40025 Water Flow Rate gallons per minute 0 -65,535

Data Type Index Measurement Units Valid RangeDiscrete Input 32 Flow State NA 0 = Pump Off Request

1 = Pump On Request

Data Type Index Measurement Units Valid RangeInput Register 40002 Temperature °F x 10 10 - 120°F

Data Type Index Measurement Units Valid RangeHolding Register 40005 Temperature °F x 10 -40-245°F

Data Type Index Measurement Units Valid RangeDiscrete Input 8 Flow State NA 0 = No Flow

1 = Flow



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Evaporator Pump Run HoursThis output network variable indicates the number of hours that the selected evaporator pump has been turned on. There is a sepa-rate output for each pump. See Pump Select on page18. (I47)

Evaporator Refrigerant PressureThis output network variable indicates the current refrigerant pressure in the evaporator. There is a separate output for each com-pressor. See Compressor Select on page 13. (A17)

Evaporator Saturated Refrigerant TemperatureThis output network variable indicates the current saturated refrigerant temperature in the evaporator. There is a separate output for each compressor. See Compressor Select on page 13. (A16)

Evaporator Water Flow RateThis output network variable indicates the rate of water flow through the evaporator. (A18)

Evaporator Water Pump StatusThis output network variable indicates whether the selected pump has been commanded On or Off. See Pump Select on page 18. (D29)

Heat Recovery Entering Water TemperatureThis output network variable indicates the current temperature of the water entering the heat recovery section. (A22)

Heat Recovery Leaving Water TemperatureThis output network variable indicates the current temperature of the water leaving the heat recovery section. (A23)

Data Type Index Measurement Units Valid RangeHolding Register 40176 Event Count Hours 0 -65,535

Data Type Index Measurement Units Valid RangeHolding Register 40018 Pressure (gauge) psi -22592-22591 psi


Data Type Index Measurement Units Valid RangeHolding Register 40019 Water Flow Rate gallons per minute 0 -65,535

Data Type Index Measurement Units Valid RangeDiscrete Input 30 Flow State NA 0 = Pump Off Request

1 = Pump On Request



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Heat SetpointThis input network variable provides the heating setpoint when the chiller is operating in the heat mode. The value is ignored if the controller is in cooling mode. (A5)


Ice SetpointThis input network property sets the temperature of the Leaving Chilled Water when the chiller is operating in the ice mode. (A50)


Liquid Line Refrigerant PressureThis output network variable indicates the current liquid line refrigerant pressure. (A38)

Liquid Line Refrigerant TemperatureThis output network variable indicates the current liquid line refrigerant temperature. (A36)

Oil Feed PressureThis output network variable indicates the current compressor oil feed pressure. There is a separate output for each compressor. See Compressor Select on page 13. (A32)

Oil Feed TemperatureThis output network variable indicates the current compressor oil feed temperature. There is a separate output for each compressor. See Compressor Select on page 13. (A34)

Oil Sump PressureThis output network variable indicates the current compressor oil sump pressure. There is a separate output for each compressor. See Compressor Select on page 13. (A33)

Data Type Index Measurement Units Valid RangeInput Register 40006 Temperature °F x 10 50-120°F

Data Type Index Measurement Units Valid RangeInput Register 40051 Temperature °F x 10 15 - 35°F

Data Type Index Measurement Units Valid RangeHolding Register 40039 Pressure psi -22592-22591 psi


Data Type Index Measurement Units Valid Rangeholding Register 40033 Pressure psi -22592-22591 psi


Data Type Index Measurement Units Valid RangeHolding Register 40034 Pressure psi -22592-22591 psi

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Oil Sump TemperatureThis output network variable indicates the current compressor oil sump temperature. There is a separate output for each compressor. See Compressor Select on page 13. (A35)

Outdoor Air TemperatureThis output network variable indicates the current outdoor air temperature. (A39)

Pump SelectThis input network variable selects which pump (Number 1 or Number 2) supplies the data. The controller returns the information for the appropriate Condenser or Evaporator pump. You must first select a pump then interrogate the selected pump. See Condenser Pump Run Hours on page 14 and Evaporator Pump Run Hours on page 16. (D19)

Run EnabledThis output network variable indicates the main running mode and states of the Chiller. See Chiller Status on page 12 for details. The Run Enabled output network variable indicates that the chiller can start if operating conditions are met. (D2)



Data Type Index Measurement Units Valid RangeCoil 20 Event Count NA 0 = Pump #1

1 = Pump #2

Data Type Index Measurement Units Valid RangeInput Register 3 Chiller State NA 0 = Off

1 = Run Allowed

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AlarmsAlarm ClassesMODBUS alarms in a MicroTech II unit controller are divided into three classes: Faults, Problems, and Warnings. Fault alarms have the highest severity level. Problem alarms have medium severity level. Warning alarms have the lowest severity level.

Fault AlarmsFault alarms require an acknowledgment from the operator. These alarms indicate that the compressor is shut down.

Problem AlarmsProblem alarms do not cause compressor shutdown but limit operation of the chiller in some way.

Warning AlarmsA warning is enunciated whenever an abnormal condition exists which does not affect chiller operation.

Alarm HandlingOne MODBUS network variable indicates an alarm condition and one network variable clears alarms. To determine the particular alarm condition, you must read the status of the 16 Active Alarms Holding Registers.

Alarm Digital OutputThis network output variable indicates whether an alarm condition has occurred. This variable must be polled for alarm notification. (D3)

Clear AlarmsThis input network variable clears all active alarms. It cannot clear all alarms in the Fault category (alarms that shut down the chiller). They would have to be cleared at the chiller panel. The alarms that cannot be cleared over the network (but can be cleared at the chiller) are: (D24)

• Low Evaporator Pressure• High Condenser Pressure (by pressure sensor)• High Condenser Pressure (by pressure switch)• Low Oil Pressure• Freeze Protection• High Motor Temperature

Active AlarmsThe Active Alarms Holding Registers contain a single bit for each alarm condition. You must read the status of these registers to determine the particular alarm condition indicated by the Alarm Digital Output. Table 3 defines the bit location for each alarm con-dition. (I1-I16)

Data Type Index Measurement Units Valid RangeDiscrete Input 4 NA NA 0 = No Alarm

1 = Alarm

Data Type Index Measurement Units Valid RangeCoil 25 NA NA 0 = Normal

1 = Clear Alarm

Data Type Index Measurement Units Valid RangeHolding Registers 40130-40145 Alarm Condition NA 0 = No Alarm

1 = Alarm

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Table 3: MODBUS Alarms

Description WSC/WDC/WPV AGZ ACZ WGZ AGS Holding Register Bit

1 Warnings2 Entering Condenser Water Temperature Sensor Fault X 40130 13 Entering Evaporator Water Temperature Sensor Fault X X 40130 24 Liquid Line Refrigerant Temperature Sensor Fault X 40130 35 Leaving Condenser Water Temperature Sensor Fault X 40130 46 Repower After Power Loss 1 40130 57 Repower After Power Loss 2 40130 68 Repower After Power Loss 3 40130 79 Repower After Power Loss 4 40130 810 (Expansion Alarm - Warning) 40130 911 Problems12 Low Ambient Temperature Lockout X X X X 40130 1013 High Condenser Pressure - Inhibit Loading Circuit 1 X X X X 40130 1114 High Condenser Pressure - Inhibit Loading Circuit 2 X X X X 40130 1215 High Condenser Pressure - Inhibit Loading Circuit 3 X 40130 1316 High Condenser Pressure - Inhibit Loading Circuit 4 40130 1417 High Condenser Pressure - Unload X X 40130 1518 High Condenser Pressure - Unload Circuit 1 X X X X 40131 019 High Condenser Pressure - Unload Circuit 2 X X X X 40131 120 High Condenser Pressure - Unload Circuit 3 X 40131 221 High Condenser Pressure - Unload Circuit 4 40131 322 Condenser Water Freeze Protect Comp 1 X 40131 423 Condenser Water Freeze Protect Comp 2 X 40131 524 Condenser Water Freeze Protect Comp 3 40131 625 Condenser Water Freeze Protect Comp 4 40131 726 Condenser Pump #1 Fault X 40131 827 Condenser Pump #2 Fault X 40131 928 High Discharge Temperature Comp 1 X 40131 1029 High Discharge Temperature Comp 2 X 40131 1130 High Discharge Temperature Comp 3 40131 1231 High Discharge Temperature Comp 4 40131 1332 Entering Evap Temperature Sensor Fault (EWT reset active) X 40131 1433 Low Evaporator Pressure - Inhibit Loading X X X 40131 1534 Low Evaporator Pressure - Inhibit Loading Circuit 1 X X X X X 40132 035 Low Evaporator Pressure - Inhibit Loading Circuit 2 X X X X X 40132 136 Low Evaporator Pressure - Inhibit Loading Circuit 3 X 40132 237 Low Evaporator Pressure - Inhibit Loading Circuit 4 40132 338 Low Evaporator Pressure - Unload X X X 40132 439 Low Evaporator Pressure - Unload Circuit 1 X X X X X 40132 540 Low Evaporator Pressure - Unload Circuit 2 X X X X X 40132 641 Low Evaporator Pressure - Unload Circuit 3 X 40132 742 Low Evaporator Pressure - Unload Circuit 4 40132 843 High Motor Current On Compressor #1 X 40132 944 High Motor Current On Compressor #2 X 40132 1045 High Motor Current On Compressor #3 40132 1146 High Motor Current On Compressor #4 40132 1247 Evaporator Freeze Protect Comp 1 X 40132 1348 Evaporator Freeze Protect Comp 2 X 40132 1449 Evaporator Freeze Protect Comp 3 40132 1550 Evaporator Freeze Protect Comp 4 40133 051 Evaporator Pump #1 Fault X 40133 152 Evaporator Pump #2 Fault X 40133 253 (Expansion Alarm - Problem) 40133 3

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54 Faults55 Outside Ambient Temperature Sensor Fault X X X 40133 456 Compressor Current Overload Trip #1 X 40133 557 Compressor Current Overload Trip #2 X 40133 658 Compressor Current Overload Trip #3 40133 759 Compressor Current Overload Trip #4 40133 860 Motor Current Imbalance On Compressor #1 X X 40133 961 Motor Current Imbalance On Compressor #2 X X 40133 1062 Motor Current Imbalance On Compressor #3 40133 1163 Motor Current Imbalance On Compressor #4 40133 1264 Low Motor Current Comp 1 X X 40133 1365 Low Motor Current Comp 2 X X 40133 1467 Low Motor Current Comp 3 40133 1567 Low Motor Current Comp 4 40134 067 Motor Protection X X 40134 167 Motor Protection Circuit 1 X X X X 40134 267 Motor Protection Circuit 2 X X X X 40134 367 High Motor Temperature Comp 1 X 40134 467 High Motor Temperature Comp 2 X 40134 568 High Motor Temperature Comp 3 40134 669 High Motor Temperature Comp 4 40134 770 Phase Loss At Compressor 1 X 40134 871 Phase Loss At Compressor 2 X 40134 972 Phase Loss At Compressor 3 40134 1073 Phase Loss At Compressor 4 40134 1174 Phase Reversal At Compressor 1 X 40134 1275 Phase Reversal At Compressor 2 X 40134 1376 Phase Reversal At Compressor 3 40134 1477 Phase Reversal At Compressor 4 40134 1578 Overvoltage On Compressor 1 X 40135 079 Overvoltage On Compressor 2 X 40135 180 Overvoltage On Compressor 3 40135 281 Overvoltage On Compressor 4 40135 382 Undervoltage On Compressor 1 X 40135 483 Undervoltage On Compressor 2 X 40135 584 Undervoltage On Compressor 3 40135 685 Undervoltage On Compressor 4 40135 786 Condenser Pressure Sensor Fault X X X 40135 887 Condenser Pressure Sensor Fault Circuit 1 X X X X X 40135 988 Condenser Pressure Sensor Fault Circuit 2 X X X X X 40135 1089 Condenser Pressure Sensor Fault Circuit 3 X 40135 1190 Condenser Pressure Sensor Fault Circuit 4 40135 1291 No Condenser Water Flow X X 40135 1392 High Condenser Pressure X X X 40135 1493 High Condenser Pressure Circuit 1 X X X X X 40135 1594 High Condenser Pressure Circuit 2 X X X X X 40136 095 High Condenser Pressure Circuit 3 X 40136 196 High Condenser Pressure Circuit 4 40136 297 No Compressor Stop Comp 1 X 40136 398 No Compressor Stop Comp 2 X 40136 499 No Compressor Stop Comp 3 40136 5100 No Compressor Stop Comp 4 40136 6101 Discharge Temperature Sensor Fault Circuit 1 X X 40136 7

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102 Discharge Temperature Sensor Fault Circuit 2 X X 40136 8103 Discharge Temperature Sensor Fault Circuit 3 X 40136 9104 Discharge Temperature Sensor Fault Circuit 4 40136 10105 High Discharge Temperature Circuit 1 X 40136 11106 High Discharge Temperature Circuit 2 X 40136 12107 High Discharge Temperature Circuit 3 40136 13108 High Discharge Temperature Circuit 4 40136 14109 Entering Condenser Water Temperature Sensor Fault X 40136 15110 No Evaporator Water Flow X X X X X 40137 0111 Evaporator Water Freeze Protect X X X 40137 1112 Low Evaporator Pressure X X X 40137 2113 Low Evaporator Pressure Circuit 1 X X X X X 40137 3114 Low Evaporator Pressure Circuit 2 X X X X X 40137 4115 Low Evaporator Pressure Circuit 3 X 40137 5116 Low Evaporator Pressure Circuit 4 40137 6117 Evaporator Pressure Sensor Fault X X X 40137 7118 Evaporator Pressure Sensor Fault Circuit 1 X X X X X 40137 8119 Evaporator Pressure Sensor Fault Circuit 2 X X X X X 40137 9120 Evaporator Pressure Sensor Fault Circuit 3 X 40137 10121 Evaporator Pressure Sensor Fault Circuit 4 40137 11122 Ground Fault Protection 1 X 40137 12123 Ground Fault Protection 2 X 40137 13124 Ground Fault Protection 3 40137 14125 Ground Fault Protection 4 40137 15126 Below Minimum Lift Pressure Circuit 1 X 40138 0127 Below Minimum Lift Pressure Circuit 2 X 40138 1128 Below Minimum Lift Pressure Circuit 3 X 40138 2129 Below Minimum Lift Pressure Circuit 4 40138 3130 Liquid Line Pressure Sensor Fault Circuit 1 X 40138 4131 Liquid Line Pressure Sensor Fault Circuit 2 X 40138 5132 Liquid Line Pressure Sensor Fault Circuit 3 X 40138 6133 Liquid Line Pressure Sensor Fault Circuit 4 40138 7134 Liquid Line Refrigerant Temperature Sensor Fault Circuit 1 X 40138 8135 Liquid Line Refrigerant Temperature Sensor Fault Circuit 2 X 40138 9136 Liquid Line Refrigerant Temperature Sensor Fault Circuit 3 X 40138 10137 Liquid Line Refrigerant Temperature Sensor Fault Circuit 4 40138 11138 Re-Start Fault X X 40138 12139 Re-Start Fault Circuit 1 X X X X 40138 13140 Re-Start Fault Circuit 2 X X X X 40138 14141 Re-Start Fault Circuit 3 40138 15142 Re-Start Fault Circuit 4 40139 0143 Leaving Evaporator Water Temperature Sensor Fault X X X X 40139 1144 Leaving Evaporator Water Temperature Sensor Fault Comp 1 X X 40139 2145 Leaving Evaporator Water Temperature Sensor Fault Comp 2 X X 40139 3146 Leaving Evaporator Water Temperature Sensor Fault Comp 3 40139 4147 Leaving Evaporator Water Temperature Sensor Fault Comp 4 40139 5148 Mechanical High Pressure X X X 40139 6149 Mechanical High Pressure Circuit 1 X X X X X 40139 7151 Mechanical High Pressure Circuit 2 X X X X X 40139 8152 Mechanical High Pressure Circuit 3 X 40139 9153 Mechanical High Pressure Circuit 4 40139 10154 Low Oil Net Pressure Comp 1 X 40139 11155 Low Oil Net Pressure Comp 2 X 40139 12

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156 Low Oil Net Pressure Comp 3 40139 13157 Low Oil Net Pressure Comp 4 40139 14158 High Oil Feed Temperature Comp 1 X 40139 15159 High Oil Feed Temperature Comp 2 X 40140 0160 High Oil Feed Temperature Comp 3 40140 1161 High Oil Feed Temperature Comp 4 40140 2162 Low Oil Feed Temperature Comp 1 X 40140 3163 Low Oil Feed Temperature Comp 2 X 40140 4164 Low Oil Feed Temperature Comp 3 40140 5165 Low Oil Feed Temperature Comp 4 40140 6166 Oil Feed Temperature Sensor Fault Comp 1 X 40140 7167 Oil Feed Temperature Sensor Fault Comp 2 X 40140 8168 Oil Feed Temperature Sensor Fault Comp 3 40140 9169 Oil Feed Temperature Sensor Fault Comp 4 40140 10170 Low Oil Level Circuit 1 X 40140 11171 Low Oil Level Circuit 2 X 40140 12172 Low Oil Level Circuit 3 X 40140 13173 Low Oil Level Circuit 4 40140 14175 High Oil Pressure Difference Circuit 1 X 40140 15176 High Oil Pressure Difference Circuit 2 X 40141 0177 High Oil Pressure Difference Circuit 3 X 40141 1178 High Oil Pressure Difference Circuit 4 40141 2179 Oil Feed Pressure Sensor Fault Comp 1 X 40141 3180 Oil Feed Pressure Sensor Fault Comp 2 X 40141 4181 Oil Feed Pressure Sensor Fault Comp 3 40141 5182 Oil Feed Pressure Sensor Fault Comp 4 40141 6183 Oil Sump Pressure Sensor Fault Comp 1 X 40141 7184 Oil Sump Pressure Sensor Fault Comp 2 X 40141 8185 Oil Sump Pressure Sensor Fault Comp 3 40141 9186 Oil Sump Pressure Sensor Fault Comp 4 40141 10187 Oil Sump Temperature Sensor Fault Comp 1 X 40141 11188 Oil Sump Temperature Sensor Fault Comp 2 X 40141 12189 Oil Sump Temperature Sensor Fault Comp 3 40141 13190 Oil Sump Temperature Sensor Fault Comp 4 40141 14191 Phase Voltage Protection X 40141 15192 Starter Fault Compressor 1 X X 40142 0193 Starter Fault Compressor 2 X X 40142 1195 Starter Fault Compressor 3 X 40142 2196 Starter Fault Compressor 4 40142 3197 No Starter Transition Comp 1 X 40142 4198 No Starter Transition Comp 2 X 40142 5199 No Starter Transition Comp 3 40142 6200 No Starter Transition Comp 4 40142 7211 No Oil Pressure Start Comp 1 X 40142 8212 No Oil Pressure Start Comp 2 X 40142 9213 No Oil Pressure Start Comp 3 40142 10214 No Oil Pressure Start Comp 4 40142 11215 Low Subcooling Circuit 1 40142 12216 Low Subcooling Circuit 2 40142 13217 Low Subcooling Circuit 3 40142 14218 Low Subcooling Circuit 4 40142 15219 Surge High Suct SH-Running Comp 1 X 40143 0220 Surge High Suct SH-Running Comp 2 X 40143 1

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221 Surge High Suct SH-Running Comp 3 40143 2223 Surge High Suct SH-Running Comp 4 40143 3224 Surge High Suct SH-Starting Comp 1 X 40143 4225 Surge High Suct SH-Starting Comp 2 X 40143 5226 Surge High Suct SH-Starting Comp 3 40143 6227 Surge High Suct SH-Starting Comp 4 40143 7228 Suction Temperature Sensor Fault Circuit 1 X 40143 8229 Suction Temperature Sensor Fault Circuit 2 X 40143 9230 Suction Temperature Sensor Fault Circuit 3 40143 10231 Suction Temperature Sensor Fault Circuit 4 40143 11232 Vanes Open No Start Comp 1 X 40143 12233 Vanes Open No Start Comp 2 X 40143 13234 Vanes Open No Start Comp 3 40143 14235 Vanes Open No Start Comp 4 40143 15236 (Expansion Alarm- Fault) X 40144 0

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IndexAActive Alarms 19Active Setpoint 11Actual Capacity 11Alarm Classes 19Alarm Digital Output 19Alarm Handling 19Alarms 19CCapacity Limit Output 11Capacity Limit Setpoint 11Chiller Alarm Variables 9Chiller Enable 11Chiller Limited 11Chiller Local/Remote 12Chiller Mode Output 12Chiller Mode Setpoint 12Chiller Models 4Chiller On Off 12Chiller Status 12Chiller Variables 8Clear Alarms 19Compatibility 5Comprehensive Data Point Tables 8Compressor Discharge Temperature 12Compressor Percent RLA 13Compressor Run Hours 13Compressor Select 13Compressor Starts 13Compressor Suction Line Temperature 14Condenser Entering Water Temperature 14Condenser Flow Switch Status 14Condenser Leaving Water Temperature 14Condenser Pump Run Hours 14Condenser Refrigerant Pressure 14Condenser Saturated Refrigerant Temperature 14Condenser Water Flow Rate 15Condenser Water Pump Status 15Configuring the Unit Controller 6Controller Data Points 4Cool Setpoint 15DData Type 6Detailed Data Point Information 10Display Important Data Points 7EEvaporator Entering Water Temperature 15Evaporator Flow Switch Status 15

Evaporator Leaving Water Temperature for Com-pressor 15Evaporator Leaving Water Temperature for Unit 15Evaporator Pump Run Hours 16Evaporator Refrigerant Pressure 16Evaporator Saturated Refrigerant Temperature 16Evaporator Water Flow Rate 16Evaporator Water Pump Status 16Example Data Point: Chiller On Off 6FFault Alarms 19HHeat Recovery Entering Water Temperature 16Heat Recovery Leaving Water Temperature 16Heat Setpoint 17IIce Setpoint 17Introduction 4LLiquid Line Refrigerant Pressure 17Liquid Line Refrigerant Temperature 17MMODBUS Data Point 6, 8MODBUS Protocol 5OOil Feed Pressure 17Oil Feed Temperature 17Oil Sump Pressure 17Oil Sump Temperature 18Outdoor Air Temperature 18PProblem Alarms 19Protocol Definitions 5Pump Select 18RReference Documents 3Run Enabled 18SSet up the Unit for Network Control 7TTable of Contents 2Typical Minimum Integration 7VValid Error Codes 6Valid Function Codes 5WWarning Alarms 19

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