microtech iii rooftop and self contained unit controller protocol … · ed15112-5 5 introduction...

Engineering Data ED 15112 - 5 Group: Controls Part Number: ED 15112 Date: December 2009 Supersedes: ED 15112-4

© 2009 McQuay International

MicroTech® III Rooftop and Self Contained Unit Controller Protocol Information

BACnet® Networks LONWORKS® Networks

• Applied Rooftop models: RPE, RDE, RPS, RDT, RFS, RDS and RAH • Self-Contained models: SWT, SWP • Maverick II™ Commercial Rooftop model MPS

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Table of Contents

Table of Contents............................................................................. 2 Revision History .............................................................................................3 Software Revision...........................................................................................3 Reference Documents .....................................................................................4 Notice ..............................................................................................................4 Limited Warranty............................................................................................4 Introduction ...................................................................................... 5 Unit Controller Data Points ............................................................................5 Protocol Definitions........................................................................................5 Basic Protocol Information ............................................................. 6 Setting Unit Controller Communications Parameters ....................................6 BACnet Networks...........................................................................................6 MicroTech III Unit Controller Device Object................................................8 Network Considerations .................................................................................9 The BUS LED is green when the BACnet communication module is communicating with the network and is red when it is not communicating with the network. The default data transmission rate is set to 38,400 bps (baud). This rate can be changed to 9,600, 19,200 or 76,800 with the keypad/display. Refer to Setting Unit Controller Communications Parameters in the Basic Protocol Information section of this document............................................................................................10 LONWORKS Networks ..................................................................................11 Typical Application: Minimum Integration .................................. 16 Set up the Unit for Network Control ............................................................16 Display Important Data Points .....................................................................17 Network Off ..................................................................................................17 Network Occupancy Scheduling ..................................................................17 Alarms...........................................................................................................18 Unit Controller Sequence of Operation........................................................19 Comprehensive Data Point Tables............................................... 20 BACnet Standard Objects.............................................................................20 LONWORKS Variables ..................................................................................25 Detailed Data Point Information ................................................... 29 AHU Loc/Net................................................................................................29 Application Mode .........................................................................................29 Airflow Switch (Fault)..................................................................................30 Airflow Switch (Warning)............................................................................30 Application Version......................................................................................31 Building Static Pressure................................................................................31 Building Static Pressure Setpoint .................................................................31 Conductivity..................................................................................................32 Control Temperature.....................................................................................32 Cooling Capacity ..........................................................................................33 Cooling Status...............................................................................................33 Date ...............................................................................................................34 Dew Point Setpoint .......................................................................................34 Dew Point Temperature................................................................................34 Dirty Filter Switch ........................................................................................35 Discharge Air Temperature ..........................................................................35 Duct High Limit Switch................................................................................35 Duct Static Pressure ......................................................................................36 Duct Static Pressure Setpoint .......................................................................36 Economizer Capacity....................................................................................36 Economizer Enable .......................................................................................37 Economizer Status ........................................................................................38 Effective Discharge Air Temperature Setpoint ............................................38 Effective Setpoint Output .............................................................................39 Emergency Off Switch .................................................................................39 Emergency Override .....................................................................................40 Energy Recovery Discharge Air Temperature .............................................40 Energy Recovery Exhaust Air Temperature ................................................41 Energy Recovery Wheel Status ....................................................................41 Energy Recovery Wheel Speed ....................................................................41 Entering Fan Temperature / Leaving Coil Temp .........................................42 Entering Water Temperature ........................................................................42 Exhaust Fan Capacity ...................................................................................43 Exhaust Fan Capacity Input..........................................................................43 Freeze Switch (Fault)....................................................................................43 Freeze Switch (Problem) ..............................................................................44 Heat Fail Input ..............................................................................................44

Heating Capacity ..........................................................................................45 Heating Status ...............................................................................................45 High Pressure Circuit 1 Switch ....................................................................46 High Pressure Circuit 2 Switch ....................................................................46 High Pressure Circuit 3 Switch ....................................................................46 High Pressure Circuit 4 Switch ....................................................................47 High Pressure Circuit 5 Switch ....................................................................47 High Pressure Circuit 6 Switch ....................................................................48 HVAC Unit Type Identifier..........................................................................48 Local OA Temperature .................................................................................49 Local Space Temperature .............................................................................49 Low Pressure Circuit 1 Switch .....................................................................49 Low Pressure Circuit 2 Switch .....................................................................50 Low Pressure Circuit 3 Switch .....................................................................50 Low Pressure Circuit 4 Switch .....................................................................50 Low Pressure Circuit 5 Switch .....................................................................51 Low Pressure Circuit 6 Switch .....................................................................51 Maximum Discharge Air Heating Setpoint..................................................52 McQuay AHU Unit Status............................................................................52 Minimum Discharge Air Cooling Setpoint ..................................................53 Minimum Send Time....................................................................................53 Mixed Air Temperature ................................................................................54 Network Discharge Air Cooling Setpoint ....................................................54 Network Discharge Air Heating Setpoint ....................................................55 Object Request..............................................................................................55 Object Status .................................................................................................56 Occupancy ....................................................................................................57 Occupancy Mode ..........................................................................................58 Occupancy Scheduler Input..........................................................................59 Occupied Cooling Setpoint...........................................................................60 Occupied Heating Setpoint...........................................................................61 Outdoor Air Damper Minimum Position Input............................................61 Outdoor Air Temperature .............................................................................62 Outdoor Air Temperature Input....................................................................62 Outdoor Airflow ...........................................................................................62 Outdoor Airflow Setpoint.............................................................................63 Primary Cool Enable.....................................................................................63 Primary Heat Enable.....................................................................................64 Receive Heartbeat .........................................................................................65 Reheat Capacity ............................................................................................65 Relative Humidity.........................................................................................66 Relative Humidity Input ...............................................................................66 Relative Humidity Setpoint ..........................................................................67 Remote Return/Exhaust Fan Capacity Control Flag ....................................67 Remote Supply Fan Capacity Control Flag..................................................68 Return Air Temperature................................................................................68 Return/Exhaust Fan Capacity .......................................................................68 Exhaust Fan Status........................................................................................69 Return Fan Capacity Input............................................................................69 Send Heartbeat..............................................................................................70 Space CO2 .....................................................................................................70 Space IAQ Input ...........................................................................................71 Space Temperature .......................................................................................71 Space Temperature Input..............................................................................72 Sump Pump Switch.......................................................................................72 Supply Fan Capacity.....................................................................................72 Supply Fan Capacity Input ...........................................................................73 Temperature Setpoint Input ..........................................................................73 Time ..............................................................................................................74 Unit State ......................................................................................................74 Unit Support..................................................................................................75 Unoccupied Cooling Setpoint.......................................................................75 Unoccupied Heating Setpoint.......................................................................76 VAV Box Output ..........................................................................................77 Water Flow Switch .......................................................................................77 Water Regulating Valve ...............................................................................77 Waterflow Switch Input................................................................................78 Alarms .............................................................................................79 Fault Alarms (Highest Priority)....................................................................79 Problem Alarms (Medium Priority) .............................................................80

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Warning Alarms (Lowest Priority) .............................................................. 81 Alarm Monitoring......................................................................................... 81 Alarm Notification ....................................................................................... 82 Alarm Clearing ............................................................................................. 83 Objects .......................................................................................................... 83 Clear Alarms................................................................................................. 83 Notification Class - Faults............................................................................ 84 Notification Class - Problem........................................................................ 85 Notification Class - Warnings...................................................................... 86 Warning Alarm............................................................................................. 88 Problem Alarm ............................................................................................. 89 Fault Alarm................................................................................................... 90 Airflow Fault ................................................................................................ 91 Airflow Switch Warning .............................................................................. 91 Conductivity Warning .................................................................................. 92 Control Temp Fault ...................................................................................... 92 Dirty Filter Warning..................................................................................... 92 Discharge Sensor Fault................................................................................. 93 Duct High Limit Fault .................................................................................. 93 Emergency Off Fault .................................................................................... 93 Entering Fan Temp / Leaving Coil Temp Problem ..................................... 94 Entering Water Temp Problem .................................................................... 94 Freeze Fault .................................................................................................. 94 Freeze Problem............................................................................................. 95 Heat Fail Problem......................................................................................... 95 High Discharge Temp Fault ......................................................................... 96 High Pressure Circuit 1 Problem ................................................................. 96 High Pressure Circuit 2 Problem ................................................................. 96 High Pressure Circuit 3 Problem ................................................................. 97 High Pressure Circuit 4 Problem ................................................................. 97 High Pressure Circuit 5 Problem ................................................................. 97 High Pressure Circuit 6 Problem ................................................................. 98

High Return Temp Fault .............................................................................. 98 Low Discharge Temp Fault.......................................................................... 99 Low Pressure Circuit 1 Problem .................................................................. 99 Low Pressure Circuit 2 Problem .................................................................. 99 Low Pressure Circuit 3 Problem ................................................................ 100 Low Pressure Circuit 4 Problem ................................................................ 100 Low Pressure Circuit 5 Problem ................................................................ 100 Low Pressure Circuit 6 Problem ................................................................ 101 Mixed Air Temp Problem .......................................................................... 101 Outdoor Temp Problem.............................................................................. 102 Return Temp Problem................................................................................ 102 Space Temp Problem ................................................................................. 102 Sump Pump Fail Problem .......................................................................... 103 Waterflow Switch Problem........................................................................ 103 Water Regulating Valve Problem .............................................................. 104 BACnet Device Management.......................................................105 DeviceCommunicationControl - Disable................................................... 105 DeviceCommunicationControl - Enable.................................................... 105 ReinitializeDevice (Reset) ......................................................................... 105 Appendix A: Protocol Implementation Conformance Statement (PICS) ..................................................106 BACnet Protocol Implementation Conformance Statement ..................... 106 Product Description.................................................................................... 106 BACnet Standardized Device Profile ........................................................ 106 Standard Object Types Supported.............................................................. 108 Data Link Layer Options............................................................................ 111 Segmentation Capability ............................................................................ 111 Device Address Binding ............................................................................ 111 Networking Options ................................................................................... 111 Character Sets Supported ........................................................................... 111 Index ..............................................................................................113

Revision History ED15112 September 2008 Preliminary release. ED15112-1 October 29, 2008 Added 2 notification class objects to BACnet. There are now a total of 3 objects (faults, problems & warnings). ED15112-2 January 22, 2009 The only change was to the Networking Options section of the Protocol Information Conformance Statement

(PICS). The BBMD does support registration by foreign devices. This was previously marked no. Changed the enumeration for the Water Regulating Valve object from 0=Open and 1=Closed to 0=normal and 1=alarm.

ED15112-3 March 11, 2009 The only change was to the Standard Object Types Supported section of the Protocol Information Conformance Statement (PICS). • Present Value, Priority Array were removed from the optional list for Binary Outputs. These properties are

required. • Removed Alarm Value from the optional list for Binary Outputs. This is not a propertie of this object. Also

removed Priority Array from Binary Inputs. This is not a property of this object. • Modified the optional properties for Multi-state Input. • Modified the optional properties for Multi-state Output

ED 15112-4 November, 2009 Added Maverick II (MPS) model. Modified keypad navigation per new global standard. Updated points affected by removal of BACnet heartbeat function (changed points from commandable to writable and removed reference to writing at priority 8). Added the following points: Heat Fail 199, Heat Fail Problem BV, ERDAT (AV), EREhht (AV), ERWhlOnOff (MV), ERWheelSpd (AV), Min OA Flw Spt (AV)

ED 15112-5 December, 2009 Changed ER Discharge Air Temp & ER Exhaust Air Temp BACnet object types from AV to AI.Updated firmware version from 2506017300 to 2506017301 in Software Revision and PICs sections.

Software Revision Keypad Menu Path Version Information\App Version= The software part number is encoded in the controller’s memory and is available for display on the keypad/display. The part number is available via BACnet® system integration tools. The software part number codification is as follows:

250 6017 3 01 Implied digits on all MicroTech III Air Handling software Base part number (6017 indicates standard software) Version Revision

This edition documents Network Protocols for version 2506017301 of the standard MicroTech® III Unit Controller application and all subsequent versions until otherwise indicated. However, if your software is of a later version (for example, 2506017302), some of the information in this document may not completely describe your application.

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You can determine the revision of the application software from the keypad/display. The path for this information from the main menu is Version Information\App Version=.

Reference Documents Company Number Title Source

McQuay International OM 920 MicroTech III Unit Controls for Applied Rooftop and Self-Contained Systems Operation Manual

www.mcquay.com

American Society of Heating, Refrigerating and Air-Conditioning Engineers

ANSI/ ASHRAE 135-2004

BACnet® A Data Communication Protocol for Building Automation and Control Networks

www.ashrae.org

LonMark Interoperability Association

078-0120-01G LonMark® Layers 1-6 Interoperability Guidelines, Version 3.4

www.lonmark.org


078-0120-01G LonMark Application Layer Interoperability Guidelines, Version 3.4

www.lonmark.org


8500_10 LonMark Functional Profile: Space Comfort Controller, Version 1.0

www.lonmark.org


8600_10 LonMark Functional Profile: Discharge Air Controller, Version

www.lonmark.org

McQuay International ED 15113 MicroTech III Rooftop and Self-Contained Systems BACnet Protocol Implementation and Conformance Statement (PICS)

www.mcquay.com

Echelon Corporation 078-0156-01G LONWORKS FTT-10A Free Topology Transceiver Users Guide

www.echelon.com

Notice © 2009 McQuay International, Minneapolis MN. All rights reserved throughout the world McQuay International reserves the right to change any information 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: BACnet from American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. Echelon, LONWORKS, LONMARK, and LonTalk from Echelon Corporation, Windows from Microsoft Corporation, and McQuay, Maverick II and MicroTech III from McQuay International.

Limited Warranty Consult your local McQuay Representative for warranty details. Refer to Form 933-430285Y. To find your local McQuay Representative, go to www.mcquay.com.

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Introduction

This document contains the necessary information you need to incorporate a MicroTech III Unit Controller (i.e. Applied Roofto, Self-Contained, or Maverick II™ Unit) from McQuay International into a building automation system (BAS). It lists all BACnet® properties, LONWORKS variables, and corresponding MicroTech III Unit Controller data points. It also contains the BACnet Protocol Implementation Conformance Statement (PICS). BACnet and LONWORKS terms are not defined. Refer to the respective specifications for definitions and details.

Unit Controller Data Points The MicroTech III Unit Controller contains data points or unit variables that are accessible from three user interfaces: the unit keypad, a BACnet network (BACnet/IP or MS/TP), or a LONWORKS network. Not all points are accessible from each interface. This manual lists all important data points and the corresponding path for each applicable interface. Refer to OM 920 (available on www.mcquay.com) for keypad details. This document contains the network details necessary to incorporate the MicroTech III Unit Controller into the network.

Protocol Definitions The MicroTech III Unit Controller can be configured in either an interoperable BACnet or LONWORKS network. The controller must have the corresponding communication module installed for network integration (see Reference Document section for corresponding part numbers). There are three communication modules: BACnet/IP, BACnet MS/TP (Master/Slave Token Passing), and LONWORKS. There are two LONWORKS modules: one in accordance with the LonMark Space Comfort Controller (General) functional profile and one in accordance with the Discharge Air Controller functional profile.

BACnet Protocol BACnet is a standard communication protocol for Building Automation and Control Networks developed by the American National Standards Institute (ANSI) and American Society of Heating, Refrigeration and Air-conditioning Engineers (ASHRAE) specified in ANSI/ASHRAE standard 135-2004. It addresses all aspects of the various systems that are applied to building control systems. BACnet provides the communication infrastructure needed to integrate products manufactured by different vendors and to integrate building services that are now independent.

LONWORKS Networks A control network specification for information exchange built upon the use of LonTalk for transmitting data developed by the Echelon Corporation.

LonTalk Protocol A protocol developed and owned by the Echelon Corporation. It describes how information should be transmitted between devices on a control network.

LonMark Certification LonMark certification is an official acknowledgement by the LonMark Interoperability Association that a product communicates using the LonTalk protocol and transmits and receives data per a standard LonMark functional profile. The LONWORKS communication modules are LonMark 3.4 certified in accordance with the Space Comfort Controller (SCC) and Discharge Air Controller (DAC) functional profiles.

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Basic Protocol Information

Setting Unit Controller Communications Parameters There are 12 communication parameters involved in setting up the unit controller for proper communication with the four communication module options (BACnet IP, BACnet MS/TP, LONWORKS SCC or LONWORKS DAC). These parameters are set differently depending on which communication module is ordered and shipped with the unit. The table below lists the three possible sets of default parameter settings. Not all the parameters apply to all the module options. The bold parameters can be changed using the keypad display located on the unit controller.

Communication Setup Parameter Settings Parameter Name BACnet IP BACnet MS/TP LON (DAC or SCC)

DHCP On N/A N/A IP Address DHCP Enabled N/A N/A

IP Subnet Mask DHCP Enabled N/A N/A

Given IP Address1 127.0.0.1 N/A N/A

Given IP Subnet Mask1 255.255.255.0 N/A N/A

Given Gateway Address1 127.0.0.1 N/A N/A

UDP Port Number 47808 N/A N/A MSTP MAC Address2 N/A 18 N/A MSTP Baud Rate N/A 38400 N/A

Device Instance Number variable variable N/A Max APDU Length 1476 480 N/A Device Object Name POL908_FF2BEE3 POL904_AD45EC284 N/A Receive Heartbeat 0Sec 0Sec 0Sec Max Master N/A 127 N/A Max Info Frames N/A 1 N/A Term Resistor N/A No5 N/A

Notes: 1. These addresses are used if DHCP is set to Off. For changes to these parameters to take effect, use the keypad display and set Apply IP Chg on the IP

Setup menu to Yes and cycle power. 2. The MSTP MAC Address is set via the keypad/display. You must cycle power after changing it for the changes to take effect. 3. The last 6 digits are the last 6 digits of the MAC address. The MAC address is printed a sticker affixed to the BACnet communication module. 4. The last 8 digits are computed from the production number and date code. 5. Term Resistor is only changeable via the keypad/display. This item must be set to Yes for the first and last unit on the MS/TP network. On all other

units, this variable should be set to No (default).

BACnet Networks Compatibility The MicroTech III Unit Controller conforms to the BACnet Standard (ANSI/ASHRAE 135-2004) as stated in the Protocol Implementation and Conformance Statement (PICS). See BACnet Protocol Implementation Conformance Statement on page 91.

BACnet Objects MicroTech III Unit Controllers incorporate standard BACnet object types (i.e., object types defined in the BACnet Standard) that conform to the BACnet Standard. Each object has properties that control unit variables or data points. Some object types occur more than once in the MicroTech III Unit Controller; each occurrence or instance has different properties and controls different unit variables or data points. Each instance is designated with a unique instance index. Some properties can be adjusted (read/write properties, e.g., setpoints) from the network and others can only be interrogated (read-only properties, e.g., status information). Each data point accessible from a BACnet network is described with a table that gives the Object Identifier, Property Identifier, Full BACnet Reference or path, and the Name enumeration of the property.

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Example of BACnet Data Point Keypad Menu Path Standard Menus\Flow Summary\Ret/Exh Fan=

Object Identifier Property Object Type Type ID Instance Name ID

Binary Output 4 1 Present_Value 85 Full Reference .ExhFanState.Present_Value Enumeration 0 = Off 1 = On

Object Identifier Object Identifiers are each designated with an Object type as defined in the BACnet specification. The first column of the data point definition gives the object type. This object happens to be Return/Exhaust Fan Status (See page 69.) The object identifier is a property of the object that you can read from the object. The name of the property is “Object_Identifier” and the property identifier is 75. Each object in the unit controller has a unique identifier. BACnet object identifiers are two-part numbers of BACnet Object Identifier data type. The first part identifies the object type (the first 10 bits of the 32-bit BACnet Object Identifier [See ANSI/ASHRAE 135-2004 BACnet A Data Communication Protocol for Building Automation and Control Networks]). The first column of the data point definition gives the object type. The second part identifies the instances of that particular object type (the last 22 bits of the 32-bit BACnet Object Identifier). The object identifier is shown in the data points listing as two numbers. The first number is shown in the Type ID column and designates the Object type enumeration. The second number is shown in the Instance column and designates the instance of that particular object type. The object identifier is a property of the object that you can read from the object code. The name of the property is “Object_Identifier” and the property identifier is 75. The ASHRAE BACnet specification reserves the first 128 numbers for ASHRAE defined objects. Manufacturers may define additional object types and assign a number above 127 as long as they conform to the requirements of the ASHRAE BACnet specification. Each object also has a name. Object names are character strings. The object name is a property of the object that you can read from the object. The name of the property is “Object_Name” and the property identifier is 77. Objects are sometimes referred to as an object type and instance number as they are in the BACnet specification. The example object above would be: Binary Output, Instance 1.

Property Identifier Each object has a number of properties or attributes. Each property has a unique identifier of BACnet Property Identifier data type. Property identifiers are an enumerated set; a number identifies each member. The Property Identifier enumeration number is shown in the Property ID column. In the example above the property identifier is 85.

Property Name Each property also has a unique name. Property names are character strings and shown in the Property Name column. In the example above the property name is Present Value.

Full Reference The full reference is the path of the property within the network where the MicroTech III Unit Controller resides. It is a character string equivalent to the object identifier and the property identifier. In the example above the full reference is .ExhFanState.Present_Value.

Enumerated Values Some properties are standard data types and some are enumerated sets. If the property value is an enumerated set, all enumerated values and corresponding meaning are given in the Enumeration column of the data point listing.

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MicroTech III Unit Controller Device Object Each BACnet compatible device must have one and only one BACnet Device Object.

Device Object Identifier The MicroTech III Unit Controller Device Object Identifier uniquely specifies the unit within the network. The device object type for all devices is fixed by ASHRAE at 8. Therefore the device object instance number must be unique. The initial Device Object identifier is set at manufacturing. The device object identifier can be read from the unit controller. The name of the property is “Object_Identifier” and the property identifier is 75. The initial device object instance number is 1579312. This number must be unique on the entire BACnet network. The object instance number can be changed via the keypad display. You must cycle power for the change to take effect.

! CAUTION

If another device in the network already has this object identifier (instance number), you must change the instance number of one device object, so that all devices in the network have a unique device identifier.

Device Object Name The Device Object Name uniquely specifies a device in the network. It must be unique in the network. The device name for the MicroTech III Unit Controller device is to be determined. The device name is the “prefix” of all object names in the MicroTech III Unit Controller. All objects include the device name and a period “.” preceding the object name. The Device Object name is also available to the network in the device. The property name is “Object_Name” and property identifier is 77. For a BACnet IP card, the default Object Name is POL908_###### where ###### is the last 6 digits of the MAC address. For a BACnet MS/TP card, the default Object Name is POL904_######## where ######## is computed from the production number and date code.

Device Object Properties The device object contains many other informative properties as shown in Table 1.

Table 1. MicroTech III Air Handling Unit Controller Device Object Properties

Property Identifier Default Value Data Type

Object Identifier 75 Device, variable BACnetObjectIdentifier Object Name 77 POL908_FF2BEE1

Character String

Object Type 79 8 BACnetObjectType System Status 112 BACnetDeviceStatus Vendor Name 121 McQuay Character String Vendor Identifier 120 3 Unsigned 16 Model Name 70 AHU Character String Firmware Version 44 variable Character String Application Software Revision 12 variable Character String Location 58 Character String Description 28 MTech III AHU Character String Protocol Version 98 1 Unsigned Protocol Revision 139 4 Unsigned Protocol Services Supported 97 BACnetServicesSupported Protocol Object Types Supported2 96 AI, AO, AV, BI, BO, BV, Cal,

Device, MSI, MSO, NC, Sch, MSV

BACnetObjectTypesSupported

Object List 76 Sequence of BACnetObjectIdentifer Max APDU Length Accepted 62 1476 (IP) / 480 (MS/TP) Unsigned 16

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Property Identifier Default Value Data Type

Segmentation Supported 107 None BACnetSegmentation Max Segments Accepted 167 16 Unsigned Local Time3 57 variable Time Local Date3 56 variable Date UTC Offset 119 -120 (Range: –780 .. 780) Integer Daylight Savings Status 24 variable Boolean APDU Segment Timeout 10 2000 Unsigned APDU Timeout 11 3000 Unsigned Number of APDU Retries 73 3 Unsigned Device Address Binding 30 Sequence of BACnetAddressBinding Database Revision 115 1 Unsigned Active COV Subscriptions 152 List of BACnetCOVSubsriptions

1. For BACnet IP, the last 6 digits are the last 6 digits of the MAC address. The MAC address is printed a sticker affixed to the BACnet communication module. For BACnet MS/TP, the last 8 digit are computed from the production number printed on the bar code label affixed to the side of the module.

2. While the MicroTech III Unit Controller supports the entire set of object types, not all object types are used. See the Object List for details.

3. The BACnet communication module and the MicroTech III Unit Controller both have their own time clocks. The date and time read via BACnet could differ from the date and time in the unit controller the date or time is changed via the keypad display. The two time clocks resynchronize approximately every 60-68 minutes and after every power cycle of the unit controller or BACnet communication module.

Network Considerations Access to Properties Object properties are accessible from the network by specifying the device object identifier, object identifier, and the property identifier. To access a property, you must specify the object identifier including the device object identifier or the object name including the device object name and the property identifier. BACnet/IP Addressing The BACnet/Internet Protocol (BACnet/IP) address of the MicroTech III Unit Controller in a BACnet/IP network consists of the four-octet Internet Protocol address followed by the two-octet UDP (User Datagram Protocol) port number. The BACnet/IP address is a six-octet value analogous to a MAC address. The IP address portion of the BACnet/IP address must be unique in the BACnet/IP network segment. The default UDP port number in the MicroTech III Unit Controller is 47808 (BAC0 in hexadecimal). The device object of the MicroTech III Unit Controller contains a Given Internet Protocol Subnet Mask (Default is 255.255.255.0) and a default Given IP address of 127.0.0.1. The controller does support DHCP (Dynamic Host Configuration Protocol) IP addressing which is enabled by default. The keypad/display can be used to configure the BACnet/IP addressing. The keypad will display the current IP address only when the network is connected. The MicroTech III Unit Controller can be incorporated into a BACnet/IP network dedicated to BACnet devices only or an Ethernet network shared with BACnet devices and other devices.

Shared Ethernet Networks Integrating the MicroTech III Unit Controller into a shared Ethernet LAN requires close cooperation with the network administrator of the shared Ethernet network. First, verify whether DHCP should or should not be enabled. If not, obtain the IP Subnet Mask of the shared network from the network administrator. Then, obtain static IP Addresses for all MicroTech III Unit Controllers you are integrating into the shared network. Finally obtain the address of an IP Router to use for sending IP messages to and from the BACnet IP subnets. Once you have these, refer to Setting Unit Controller Communication Parameters in the Basic Protocol Information section found previously in this document.

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Configuring the Unit Controller The MicroTech III Unit Controller is designed, programmed, and configured to be a MicroTech III Rooftop or Self-Contained Unit Controller. The unit is ready to operate with the default values of the various parameters set at the factory. Default values may be changed with the unit’s keypad or via the network. See the MicroTech III Unit Controller Operation Manual (OM 920).

BACnet MS/TP Network Addressing The BACnet MS/TP device address (Media Access Control [MAC] address) of the MicroTech III Air Handling Unit Controller in a BACnet Master Slave/Token Passing (MS/TP) Local Area Network (LAN) is set using the keypad/display. Navigate to the Advanced Menus\MSTP Setup menu to change this value. You must cycle power (turn the unit controller off and then on again) in order for the new address to take effect. The BUS LED is green when the BACnet communication module is communicating with the network and is red when it is not communicating with the network. The default data transmission rate is set to 38,400 bps (baud). This rate can be changed to 9,600, 19,200 or 76,800 with the keypad/display. Refer to Setting Unit Controller Communications Parameters in the Basic Protocol Information section of this document.

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LONWORKS Networks LONWORKS technology, developed by Echelon Corporation, is the basis for LonMark interoperable systems. This technology is independent of the communications media. The LonMark Interoperable Association has developed standards for interoperable LONWORKS technology systems. In particular they have published standards for HVAC equipment including the Discharge Air Controller functional profile and the Space Comfort Controller functional profile. These profiles specify a number of mandatory and optional standard network variables and standard configuration parameters. This manual defines these variables and parameters available in the MicroTech III Unit Controller. Compatibility The MicroTech III Unit Controller with LONWORKS communication module operates in accordance with the Discharge Air Controller (DAC) functional profile or the Space Comfort Controller (SCC) functional profile of the LonMark Interoperability standard. LONWORKS Variables MicroTech III Unit Controllers incorporate LONWORKS network variables to access unit data points. The unit controller uses LONWORKS Standard Network Variable Types (SNVT) from each profile. Some data points can be adjusted (input network variables, nvi) (read/write attributes, e.g., setpoints) from the network and others can only be interrogated (output network variables, nvo) (read only attributes, e.g., status information). Configuration variables (nci) are included with the read/write attributes. Each data point accessible from a LONWORKS network is described with a table that gives the LONWORKS Name, Profile, SNVT Type, and SNVT Index. If the variable is a configuration variable the table also includes the SCPT Reference and the SCPT Index. Example of LONWORKS Data Point LonWorks

LonWorks Name Profile SNVT Type SNVT Index nvoBldgStatPress DAC, SCC SNVT_press_p 113

LONWORKS Name Each network variable has a name that you use to access the data point. This is the name of the variable from the profile. In the example above the name network variable is nvoBldgStatPress. Profile The profile column designates the MicroTech III LONWORKS Communication Module that incorporates this network variable. The variable itself may not be a standard component of that particular profile, but the communications module does implement and it is available to the network. SNVT Type This column gives the name of the standard network variable type from the master list. SNVT Index This column gives the number of the standard network variable type from the master list. SCPT Reference This column gives the name of the Standard Configuration Parameter Type (SCPT) from the master list. SCPT Index This column gives the number of the Standard Configuration Parameter Type (SCPT) from the master list.

Network Considerations Network Topology Each LONWORKS Communication Module is equipped with an FTT-10A transceiver for network communications. This transceiver allows for (1) free topology network wiring schemes using twisted pair (unshielded) cable and (2) polarity insensitive connections at each node. These features greatly simplify installation and reduce network commissioning problems. Additional nodes may be added with little regard to existing cable routing.

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Free Topology Networks A LONWORKS “free topology network“ means that devices (nodes) can be connected to the network in a variety of geometric configurations. For example, devices can be daisy-chained from one device to the next, connected with stub cables branching off from a main cable, connected using a tree or star topology, or any of these configurations can be mixed on the same network as shown in Figure 1. Free topology segments require termination for proper transmission performance. Only one termination is required. It may be placed anywhere along the segment. Refer to Echelon LONWORKS FTT-10A Transceiver User’s Guide for further details (see Reference Documents section). Free topology networks may take on the following topologies: • Bus • Ring • Star • Mixed - Any combination of Bus, Ring, and Star

Note: Limitations to wire lengths apply and must be observed.

Figure 1. Singly Terminated Free Topology

Termination

Star Topology

Termination

Ring Topology

Termination

Singly Terminated Bus TopologyStub

}

Termination

Mixed Topology

A network segment is any part of the free topology network in which each conductor is electrically continuous. Each of the four diagrams is a illustration of a network segment. Some applications may require two or more segments; see “Free Topology Restrictions.” If necessary, segments can be joined with FTT-10A-to-FTT-10A physical layer repeaters. See Figure 2. Refer to Echelon LONWORKS FTT-10A Transceiver User’s Guide for further details.

Figure 2. Combining Network Segments with a Repeater

Termination Termination

FTT-

10A

FTT-

10A

ED15112-5 13

Free Topology Restrictions Although free topology wiring is very flexible, there are restrictions. A summary follows, refer to the Echelon FTT-10A User’s Guide for details. 1. The maximum number of nodes per segment is 64. 2. The maximum total bus length depends on the wire size:

Wire Size Maximum Node-to-Node Length Maximum Cable Length

24 AWG 820 ft (250 m) 1476 ft (450 m) 22 AWG 1312 ft (400 m) 1640 ft (500 m) 16 AWG 1640 ft (500 m) 1640 ft (500 m)

The longest cable path between any possible pair of nodes on a segment must not exceed the maximum node-to-node distance. If two or more paths exist between a pair of nodes (e.g., a loop topology), the longest path should be considered. Note that in a bus topology, the longest node-to-node distance is equal to the total cable length. a. The total length of all cable in a segment must not exceed the maximum total cable length.

3. One termination is required in each segment. It may be located anywhere along the segment.

Doubly Terminated Networks You can extend the maximum total cable length without using a repeater by using doubly-terminated network topology. See Figure 3. The trade-offs are (1) this network topology must be rigorously followed during the installation and subsequent retrofits and (2) two terminations must be installed at the ends of the bus for proper transmission performance. Refer to Echelon LONWORKS FTT-10A Transceiver User’s Guide.

Note: Limitations to wire lengths apply and must be observed.

Figure 3. Doubly Terminated Network Topology

Termination Termination

Doubly Terminated Topology Restrictions The restrictions on doubly-terminated bus topology are as follows: 1. The maximum number of nodes per segment is 64. 2. The maximum total bus length depends on the wire size:

Wire Size Maximum Cable Length

24 AWG 2952 ft (900 m) 22 AWG 4590 ft (1400 m) 16 AWG 8855 ft (2700 m)

3. The maximum stub length is 9.8 ft (3 m). The length of the MicroTech III Air Handling LONWORKS cable harness stub is 7.2 ft (2.19 m). A stub is a piece of cable that is wired between the node and the bus. See Figure 1. Note that if the bus is wired directly to the node, there is no stub, and thus the stub length is zero. If you are wiring to a field terminal strip on a unit, be sure to account for any factory wiring between the terminal strip and the controller. This wiring is considered part of the stub.

4. Two terminations are required in each segment. One must be located at each end of the bus.

Network Cable Termination LONWORKS network segments require termination for proper data transmission performance. The type and number of terminations depend on network topology. Refer to Echelon LONWORKS FTT-10A Transceiver User’s Guide. LonWorks Network Addressing Every Neuron Chip has a unique 48-bit Neuron ID or physical address. This address is generally used only at initial installation or for diagnostic purposes. For normal network operation, a device address is used.

14 ED15112-5

Device addresses are defined at the time of network configuration. All device addresses have three parts. The first part is the Domain ID, designating the domain. Devices must be in the same domain in order to communicate with each other. The second part is the Subnet ID that specifies a collection of up to 127 devices that are on a single channel or a set of channels connected by repeaters. There may be up to 255 subnets in a domain. The third part is the Node ID that identifies an individual device within the subnet. A group is a logical collection of devices within a domain. Groups are assembled with regard for their physical location in the domain. There may be up to 256 groups in domain. A group address is the address that identifies all devices of the group. There may be any number of devices in a group when unacknowledged messaging is used. Groups are limited to 64 devices if acknowledged messaging is used. A broadcast address identifies all devices within a subnet or domain. LONWORKS network variables for both the Discharge Air Controller and the Space Comfort Controller are defined below. Variables are used in both the Space Comfort Controller and Discharge Air Controller profiles unless marked otherwise. Commissioning the Network Pressing the service pin, switch on the LONWORKS Communication Module, generates a service pin message, which contains the Neuron ID and the program code identification of the node. A service pin message is a network message that is generated by a node and broadcast on the network. It can be used to commission the LONWORKS network. A network configuration tool maps device Neuron IDs to the domain/subnet/node logical addressing scheme when it creates the network image, the logical network addresses and connection information for all devices (nodes) on the network.

External Interface File (XIF) LonMark guidelines specify exact documentation rules so that proprietary configuration tools are not required to commission and configure LONWORKS devices. The MicroTech III LONWORKS Communication Module is self-documenting so that any network management tool can obtain all the information needed over the network to connect it into the system and to configure and manage it. An External Interface File (a specially formatted PC text file with an extension .XIF) is also available so that any network tool can design and configure it prior to installation. XIF files are available on www.mcquay.com.

Configuring the Unit Controller 1. The MicroTech III Unit Controller is designed, programmed, and configured to be a rooftop or self-contained unit

controller in accordance with either the LONMARK Discharge Air Controller (DAC) or LonMark Space Comfort Controller (SCC) functional profile. The unit is ready to operate with the default values of the various parameters set at the factory. Default values may be changed with the unit’s keypad or via the network. See the MicroTech III Unit Controller Operation Manual (OM 920).

Data Integrity The integrity of some data depends on a valid network connection to maintain current values. The following data points require a valid network connection if bound. If data points listed in Table 2 do not change after a given time, the controller reverts to local control. In the case of the LonWorks module, the variables will revert to their default values.

ED15112-5 15

Table 2. Receive Heartbeat Variables Data Point LonWorks Variable

Occupancy Scheduler Input nviOccSchedule Application Mode nviApplicCmd Supply Fan Capacity Input nviSupFanCap Outdoor Air Temperature nviOutdoorTemp Space Temperature nviSpaceTemp Primary Cool Enable nviPriCoolEnable Primary Heat Enable nviPriHeatEnable Economizer Enable nviEconEnable Exhaust Fan Capacity Input nviExhFanCap Return Fan Capacity Input nviRetFanCap Water Flow Switch Input nviCWFlow Space Indoor Air Quality (IAQ) Input nviSpaceIAQ Relative Humidity Input nviSpaceRH

16 ED15112-5

Typical Application: Minimum Integration

When you have integrated the unit into your network, you can monitor and control unit operation from your workstation. At a minimum, you can: • Display and monitor a minimum of important data points on your workstation display • Turn the unit on or off from your workstation • Set the schedule from your workstation and • Operate the unit safely This section gives you the basic information and outlines a procedure to set up the unit for network control.

Set up the Unit for Network Control To control the MicroTech III Unit Controller over the network, follow the setup steps below. 2. Set the S7 switch on the control panel to AUTO. Figure 4 shows the general location of a typical installation. Some

models use variations of this switch panel, but all are in the same general location.

Figure 4. Location of Switch S7

3. On the unit keypad, set the Control Mode function to AUTO. The keypad password (2526) is required to edit this function. For a detailed description of how to use the keypad, refer to MicroTech III Unit Controller Operation Manual (OM 920).

S7 Switch

ED15112-5 17

Display Important Data Points Typical workstation displays of MicroTech III 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 from the rest of the data points in the table. References in the text of this section also identify these data points with a number and shading.

Table 3. Significant Data Points

No Configuration No Temperatures/Pressures No Setpoints No Clear Alarms 1 Unit State (74) 5 Discharge Air Temperature

(35) 9 Duct Static Pressure Setpoint

(36) 14 Clear Alarms (83)

2 Application Mode (29)

6 Return Air Temperature (68)

10 Unoccupied Cooling Setpoint (75)

3 Occupancy (57) 7 Outdoor Air Temperature (62)

11 Occupied Cooling Setpoint (60)

4 Occupancy Mode (58)

8 Duct Static Pressure (35) 12 Occupied Heating Setpoint (61)

13 Unoccupied Heating Setpoint (76)

You can display any number of additional data points based on job requirements or individual preference. See LONWORKS Variables on page 25 for lists of all LONWORKS Variables available to a LONWORKS network. See BACnet Standard Objects on page 20 for a list of all Standard BACnet Objects available to a BACnet network. For a more detailed description of all available data points, see the Detailed Data Point Information section on page 29.

Network Off The unit can be turned off over the network by writing to the (2) Application Mode (see page 29). Writing AUTO to Application Mode allows the unit controller to determine its mode of operation based on input conditions. Writing OFF to Application Mode shuts down the unit, etc. The Emergency Override Mode Flag (see page 40) can also be used to shut down the unit from the network.

Network Occupancy Scheduling Using the keypad, set the Occupancy Mode to Auto. Schedule unit operation over the network with the Occ Scheduler input. Switching from OCC, UNOCC, BYPASS (TntOvrd), or AUTO commands the unit into the mode you select.

18 ED15112-5

Alarms Alarms in a MicroTech III Unit Controller are divided into three classes: Faults, Problems, and Warnings. • Fault Alarms have the highest priority. • Problem Alarms have medium priority. • Warning Alarms have the lowest priority.

Notification BACnet MicroTech III Unit Controllers may have their alarms monitored by one of four methods: 1) individually by BACnet Binary Values, 2) Alarm value using one BACnet Analog Value, 3) Alarm class, or 4) Notification Classes. 1. To monitor alarms individually, read the Present_Value of the desired Binary Value object. Each alarm has its own

Binary Value object. If the Present_Value is Inactive (0), the alarm is not active. If the Present_Value is Active (1), the alarm is active.

2. To monitor alarms by alarm value, read the Present_Value property of the Alarm Value Analog Value object. The Present_Value displays a value that corresponds to the highest priority alarm that is active. It is possible to have multiple active alarms, but only the highest priority is displayed. For example, if there is a simultaneous Dirty Filter Warning (value of 24) and a Freeze Fault (value of 252), then the Freeze Fault value of 252 will display in the Present_Value because it is the higher priority alarm of the two. Once the Freeze Fault condition is corrected and the fault is cleared, the next priority active alarm value (in this example, value of 24 for Dirty Filter alarm) is displayed. The values for all alarms are described in the Alarms section tables. If the Present_Value displays a zero, there are no active alarms.

3. To monitor alarms by alarm class, read the Present_Value of the appropriate Analog Value object (Warnings, Problems and Faults). The Present_Value displays a value that corresponds to the highest priority alarm that is active for that particular alarm class. It is possible to have multiple active alarms, but only the highest priority is displayed.

4. To monitor alarms using the Notification Class objects, see the Alarm Notification section.

LONWORKS MicroTech III Unit Controllers may have their alarms monitored by one of two methods: 1) by using the In_alarm attribute of nvoUnitStatus or 2) by alarm class. 1. Alarms within MicroTech III Unit Controllers can be monitored individually by using the In Alarm attribute of the Unit

Status Network Variable Output (i.e. nvoUnitStatus_in_alarm). This attribute displays a value that corresponds to the highest priority alarm that is active. It is possible to have multiple active alarms, but only the highest priority is displayed in this attribute. For example, if there is a simultaneous Dirty Filter Warning (value of 24) and a Freeze Fault (value of 252), then the Freeze Fault value of 252 will display in nvoUnitStatus_in_alarm because it is the higher priority alarm of the two. Once the Freeze Fault condition is corrected and the fault is cleared, the next priority active alarm value (in this example, value of 24 for Dirty Filter alarm) is displayed. The values for all alarms are described in the Alarms section tables. If the attribute nvoUnitStatus_in_alarm displays a zero, there are no active alarms. When the nvoUnitStatus_in_alarm attribute reads a value in the range of 1 to 99, a Warning Alarm is active. When the attribute reads a value in the range of 100 to 199, a Problem Alarm is active. When the attribute reads a value in the range of 200 to 255, a Fault Alarm is active.

2. To monitor alarms by alarm class, read nvoWarnAlarm, nvoProbAlarm and nvoFaultAlarm. The value corresponds to the highest priority alarm that is active. It is possible to have multiple active alarms, but only the highest priority is displayed.

Clearing BACnet MicroTech III Unit Controllers have one Multi-State Value objects that can be used to clear alarms; ClearAlarms (See page 83). All alarms of a particular class may be cleared by writing the appropriate value to the Present Value property of ClearAlarms (2=ClearAllFaults, 3=ClearAllProblems, 4=ClearAllWarnings). All alarms of all three classes can be cleared by writing a 5 (ClearAllAlarms) to Present_Value. Once the alarms are cleared, the Present_Value of this object goes back to None (1).

ED15112-5 19

LONWORKS MicroTech III Unit Controllers have one variable that can be used to clear alarms; nviClearAlarms. All alarms of a particular class may be cleared by writing the appropriate value to nviClearAlarms (1=ClearAllFaults, 2=ClearAllProblems, 3=ClearAllWarnings). All alarms of all three classes can be cleared by writing a 4 (ClearAllAlarms) to nviClearAlarms. Once the alarms are cleared, this variable goes back to None (0).

Unit Controller Sequence of Operation The sequence of operation for a MicroTech III Unit Controller depends on the control type. Refer to the MicroTech III Unit Controller Operation Manual (OM 920) for sequence of operation details, including keypad operation.

20 ED15112-5

Comprehensive Data Point Tables

These comprehensive data point tables contain the significant parameters of specific data points. The shaded data points with numbers are the data points listed in Table 3.

BACnet Standard Objects Network Control Property (Keypad attributes available as BACnet Standard Objects for network control of the unit) Pa

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Unit Status/Settings Unit State 74 R MSV 15 1=Off, 2=Start, 3=Recirc, 4=FanOnly, 5=MinDAT, 6=Htg,

7=Econo, 8=Clg McQuay AHU Unit Status 52 R MSV 1 Mode: 1=Enabled, 2=OffMan, 3=OffManCtrl, 4=OffNet,

5=OffAlm, 6=OffFanRetry Cooling Status 33 R MSV 2 1=Enabled, 2=None, 3=OffAmb, 4=OffAlarm, 5=OffNet,

6=OffMan Heating Status 45 R MSV 4 1=Enabled, 2=None, 3=OffAmb, 4=OffAlarm (Not Used),

5=OffNet, 6=OffMan Economizer Status 38 R MSV 3 1=Enabled, 2=None, 3=OffAmb, 4=OffAlarm (Not Used),

5=OffNet, 6=OffMan Cooling Capacity 33 R AV 1 cooling capacity (%)

Heating Capacity 45 R AV 2 heating capacity (%)

Supply Fan Capacity 72 R AI 8 Current supply fan capacity (%)

Return/Exhaust Fan Capacity 68 R AI 10 Current return or exhaust fan capacity (%)

Economizer Capacity 36 R AV 15 Feedback value (%)

Emergency Override 40 W MSV 10 1=Normal, 2=Off (Shuts unit off via a network signal, puts Unit Status = OffNet)

Application Mode1 29 W MSV 5 1=Off, 2=HeatOnly, 3=CoolOnly, 4=FanOnly, 5=Auto, 6=NAApplies only when Ctrl Mode=Auto

Occupancy Occupancy 57 R MSV 6 1=Occ, 2=Unocc, 3=TntOvrd

Occupancy Mode 58 W MSV 7 1=Occ, 2=Unocc, 3=TntOvrd, 4=Standby (not used) 5=Auto.

Temperatures Control Temperature 32 R AI 14 Current reading of sensor

Discharge Air Temperature 35 R AI 1 Current reading of sensor

Return Air Temperature 68 R AI 2 Current reading of sensor

Space Temperature 71 R AI 3 Current reading of sensor

Outdoor Air Temperature 62 R AI 4 Current reading of sensor

Entering Fan / Leaving Coil Temp 40 R AI 7 Current reading of sensor

Entering Water Temperature 42 R AI 6 Current reading of sensor

Mixed Air Temperature 54 R AI 5 Current reading of sensor

Flow Status Exhaust Fan Status 69 R BV 1 0=Off, 1=On

VAV Box Output 77 R MSV 14 N/A 1=Heat (Off), 2=Cool (On)

SAF Spd Control Duct Static Pressure 36 R AV 6 N/A Current reading of sensor. If unit has two sensors the lower of

the two is displayed Duct Static Pressure Setpoint 36 W AV 7 N/A Default = 1.00” WC

Remote Supply Fan Capacity Control Flag

68 W MSV 11 1=DSP, 2=Speed

Supply Fan Capacity Input1 73 W AV 21 N/A Default = 163.835 (Null) Applies only when MSV11=Speed (2)

RF/EF Spd Control Building Static Pressure 31 R AI 9 Current reading of sensor value or network input

ED15112-5 21

Network Control Property (Keypad attributes available as BACnet Standard Objects for network control of the unit) Pa

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Building Static Pressure Setpoint 31 W AV 8 Default = 0.050” WC

Remote Return/Exhaust Fan Capacity Control Flag

67 W MSV 12 1=None, 2=Tracking, 3=BldgP, 4=Speed

Return Fan Capacity Input1 69 W AV 22 Default = 163.835 (Null) Applies only when MSV 12=Speed (4)

Exhaust Fan Capacity Input1 43 W AV 23 Default = 163.835 (Null) Applies only when MSV 12=Speed (4)

Cooling Occupied Cooling Setpoint 60 W AV 9 Default = 72°F / 22.22°C

Unoccupied Cooling Setpoint 75 W AV 10 Default = 85°F / 29.44°C

Network Discharge Air Cooling Setpoint

54 W AV 13 N/A Default = 55°F / 12.75°C Applies only when ClgReset=Network

Min Discharge Air Cooling Setpoint 53 W AV 14 N/A Default = 55°F / 12.75°C

Evap Cond Set-Up Conductivity 32 R AI 12 This variable provides the conductivity of the water in the

sump of an evaporative cooled condenser. Min OA Set-Up Space CO2 70 R AI 13 This variable provides the concentration of CO2 in the space

(PPM). Outdoor Airflow 62 R AV 42

Outdoor Airflow Setpoint 62 W AV 53 Default = 2000 CFM/943.9 1/s

Heating Occupied Heating Setpoint 61 W AV 11 Default = 68°F / 20°C

Unoccupied Heating Setpoint 76 W AV 12 Default = 55°F / 12.78°C

Network Discharge Air Heating Setpoint

55 W AV 17 N/A Default = 100°F / 37.78°C Applies only when Htg Reset=Network

Max Discharge Air Heating Setpoint 52 W AV 18 N/A Default = 120°F / 48.89°C

Dehumidification Relative Humidity 66 R AI 11 N/A Displays value of optional relative humidity sensor

Dew Point Temperature 34 R AV 20 N/A Indicates current calculated dew point

Relative Humidity Setpoint 67 W AV 40

Dew Point Setpoint 34 W AV 41

Reheat Capacity 65 R AV 44 0-100%

Energy Rec Set-Up ER Discharge Air Temperature 40 R AI 16 Indicates current value of Energy Recovery Wheel discharge

air tempearautre sensor ER Exhaust Air Temperature 41 R AI 17 Indicates current value of Energy Recovery Wheel exhaust air

temparatue sensor ER Wheel Status 41 R MSV 37 Energy Recovery Wheel On/Off Command Status, 0=Off,

1=On ER Wheel Speed 41 R AV 15 Current Energy Recovery Wheel Speed (%)

Setup: IP or MS/TP Receive Heartbeat 65 W AV 43 Default is 0 seconds. This disables this feature. As of

Application version 2506017300, this point is no longer used. Unit Support 75 W MSV 16 1 = SI, 2 = English

Network Variables Outdoor Air Temperature Input1 62 W AV 29 Network input of Outdoor Air Temp (–50°F to 150°F, -

45.56°C to 65.56°C ) Default = 327.67 (Null). This parameter reverts to the Null value if written out of range.

Space Temperature Input1 72 W AV 28 Network input of Space Temp (0°F to 150°F, -17.78°C to 65.56°C ) Default = 327.67 (Null). This parameter reverts to the Null value if written out of range.

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MSV 8 1=Occ, 2=Unocc, 3=TntOvrd (not used), 4=Standby (not

used), 5=Auto (default). MSV 9 1=Occ, 2=Unocc, 3=TntOvrd (not used), 4=Standby (not

used), 5=Auto (default).

Occupancy Scheduler Input1 Current State Next State Time To Next State

59 W

AV 3

Default = 65535.0 (Null) Primary Cool Enable1 63 W AV 34 & 35 Allows the network to partially or completely disable cooling.

Applies only when Ctrl Mode=Auto Primary Heat Enable1 64 W AV 36 & 37 Allows the network to partially or completely disable heating.

Applies only when Ctrl Mode=Auto Economizer Enable1 37 W AV 32 & 33 Allows the network to partially or completely disable

economizer functions. Waterflow Switch Input1 78 W AV 38 Allows the network to set the waterflow status. 0=No Flow,

1=Flow. Space IAQ Input1 71 W AV 31 This input may be set by the network and is used for minimum

OA damper control (0-5000 PPM). Default=32767 (Null) Relative Humidity Input1 66 W AV 19 N/A Network relative humidity value. Default=163.835 (Null)

Outdoor Air Damper Min Position Input

61 W AV 16 Current OA damper min position setpoint (%) Applies only when OA Reset=Network

Eff Discharge Air Temp Setpoint 38 R AV 39 N/A This parameter will equal the Effective Heating Discharge Temperature Setpoint if the unit is in the heating state. Otherwise, it will equal the Effective Cooling Discharge Temperature Setpoint.

AHU Loc/Net 29 R MSV 38 This parameter is writable via the unit keypad display only. It must be set to Network for most of the writable network properties to apply (applicable parameters in this table denoted with a “1”). 1=Network, 2=Local

Active Alarms Clear Alarms 83 W MSV 13 1=None, 2=ClrFlts, 3=ClrPrblms, 4=ClrWrngs, 5=ClrAllAlms

Version Information Application Version 31 R Device * Read the Application_Software_Version property. This is the

version of the software loaded in the MTIII unit controller. Non-Keypad Items Local Space Temperature 49 R AV 4 Current reading of the local sensor

Local OA Temperature 49 R AV 5 Current reading of the local sensor

Notification Class - Faults 84 W NC 1 Generates notifications for fault alarms.

Notification Class - Problems 85 W NC 2 Generates notifications for problem alarms.

Notification Class - Warnings 86 W NC 3 Generates notifications for warning alarms.

Warning Alarm 88 R AV 24 0=No Active Warnings, 24=Dirty Filter, 28=Airflow Sw, 32=Conductivity

Problem Alarm 89 R AV 25 0=No Active Problems, 137=Waterflow Sw, 140=Water Regulating Valve, 154=Low Pressure – Circuit 6, 155=Low Pressure – Circuit 5, 156=Low Pressure – Circuit 4, 157=Low Pressure – Circuit 3, 158=Low Pressure – Circuit 2, 159=Low Pressure – Circuit 1, 162=High Pressure – Circuit 6, 163=High Pressure – Circuit 5, 164=High Pressure – Circuit 4, 165=High Pressure – Circuit 3, 166=High Pressure – Circuit 2, 167=High Pressure – Circuit 1, 169=Sump Pump Fail, 179=EFT_LCT Problem, 182=Return Air Sensor Problem, 185=Space Sensor Problem, 188=OAT Sensor Problem, 191=EWT Problem, 194=MAT Problem, 197=Freeze Problem, 199=HeatFail Problem

Fault Alarm 90 R AV 26 0=No Active Faults, 208=Airflow Fault, 212=Low Discharge Air Temp, 216=High Discharge Air Temp , 220=High Return Air Temp, 224=Duct High Limit, 228=Discharge Sensor Fail, 244=Control Temp Fault, 250=Emergency Stop Fault, 252=Freeze Fault

Alarm Value 86 R AV 27 0=No Active Warnings, 24=Dirty Filter, 28=Airflow Sw, 32=Conductivity, 137=Waterflow Sw, 140=Water Regulating

ED15112-5 23


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Valve, 154=Low Pressure – Circuit 6, 155=Low Pressure – Circuit 5, 156=Low Pressure – Circuit 4, 157=Low Pressure – Circuit 3, 158=Low Pressure – Circuit 2, 159=Low Pressure – Circuit 1, 162=High Pressure – Circuit 6, 163=High Pressure – Circuit 5, 164=High Pressure – Circuit 4, 165=High Pressure – Circuit 3, 166=High Pressure – Circuit 2, 167=High Pressure – Circuit 1, 169=Sump Pump Fail, 179=EFT_LCT Problem, 182=Return Air Sensor Problem, 185=Space Sensor Problem, 188=OAT Sensor Problem, 191=EWT Problem, 194=MAT Problem, 197=Freeze Problem, 199=HeatFail Problem, 208=Airflow Fault, 212=Low Discharge Air Temp, 216=High Discharge Air Temp , 220=High Return Air Temp, 224=Duct High Limit, 228=Discharge Sensor Fail, 244=Control Temp Fault, 250=Emergency Stop Fault, 252=Freeze Fault

Airflow Fault 91 R BV 27 0=normal, 1=Alarm

Airflow Switch Warning 91 R BV 2 0=normal, 1=Alarm

Conductivity Warning 92 R BV 3 0=normal, 1=Alarm

Control Temp Fault 92 R BV 28 0=normal, 1=Alarm

Dirty Filter Warning 92 R BV 4 0=normal, 1=Alarm

Discharge Sensor Fault 93 R BV 29 0=normal, 1=Alarm

Duct High Limit Fault 93 R BV 30 0=normal, 1=Alarm

Emergency Off Fault 93 R BV 31 0=normal, 1=Alarm

Entering Fan Temp / Leaving Coil Temp Problem

94 R BV 5 0=normal, 1=Alarm

Entering Water Temp Problem 94 R BV 6 0=normal, 1=Alarm

Freeze Fault 94 R BV 32 0=normal, 1=Alarm

Freeze Problem 95 R BV 7 0=normal, 1=Alarm

Heat Fail Problem 95 R BV 38 0=normal, 1=Alarm

High Discharge Temp Fault 95 R BV 33 0=normal, 1=Alarm

High Pressure Circuit 1 Problem 96 R BV 8 0=normal, 1=Alarm






High Return Temp Fault 98 R BV 34 0=normal, 1=Alarm

Low Discharge Temp Fault 99 R BV 35 0=normal, 1=Alarm

Low Pressure Circuit 1 Problem 99 R BV 14 0=normal, 1=Alarm






Mixed Air Temp Problem 101 R BV 20 0=normal, 1=Alarm

Outdoor Temp Problem 102 R BV 21 0=normal, 1=Alarm

Return Temp Problem 102 R BV 22 0=normal, 1=Alarm

Space Temp Problem 102 R BV 23 0=normal, 1=Alarm

Sump Pump Fail Problem 103 R BV 24 0=normal, 1=Alarm

Waterflow Switch Problem 103 R BV 25 0=normal, 1=Alarm

Water Regulating Valve Problem 104 R BV 26 0=normal, 1=Alarm

Airflow Switch (Fault) 30 R BI 1 0=Open, 1=Closed

Airflow Swich (Warning) 30 R BI 2 0=Open, 1=Closed

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Dirty Filter Switch 35 R BI 3 0=Open, 1=Closed

Heat Fail Input 44 R BI 23 0=Normal, 1=Alarm

High Pressure Circuit 1 Switch 46 R BI 4 0=Open, 1=Closed






Low Pressure Circuit 1 Switch 49 R BI 10 0=Open, 1=Closed






Sump Pump Switch 72 R BI 16 0=Open, 1=Closed

Water Flow Switch 77 R BI 17 0=Open, 1=Closed

Water Regulating Valve 77 R BI 18 0=normal, 1=Alarm

Freeze Switch (Fault) 43 R BI 19 0=Open, 1=Closed

Freeze Switch (Problem) 44 R BI 20 0=Open, 1=Closed

Duct High Limit Switch 35 R BI 21 0=Open, 1=Closed

Emergency Off Switch 39 R BI 22 0=Open, 1=Closed 1 MSV 38 (AHU Loc/Net) must be set to Network (1) for this propertly to apply. AHU Loc/Net is changeable only via the keypad display.

Note: Objects that appear in multiple locations on the keypad are only listed in the location they first appear on the keypad. Not all menus and items shown here will appear on keypad depending upon the specific unit configuration. Those that do not appear are not applicable to the unit.

ED15112-5 25

LONWORKS Variables Network Control Property Keypad attributes available as LONWORKS Variables for network control of the unit

Page Variable Name SNVT/SCPT Index SCC DAC Description

System Unit State 74 nvoUnitStatus 112 Mode 0=AUTO, 1=HEAT,

2=MRNG_WRMUP, 3=COOL, 6=OFF, 9=FAN_ONLY, 10=FREE_COOL, 0XFF=NUL

McQuay AHU Unit Status 52 nvoMcQAHUStatus N/A Mode: 0=Enabled, 1=OffManCtrl, 2=OffMan, 3=OffNet, 4=OffAlm, 5=OffFanRetry

Cooling Status 33 nvoMcQAHUStatus N/A 0=Enabled, 1=None, 2=Off Amb, 3=Off Alarm, 4=Off Net, 5=Off Man

Heating Status 45 nvoMcQAHUStatus N/A 0=Enabled, 1=None, 2=Off Amb, 3=Off Alarm (Not Used), 4=Off Net, 5=Off Man

Economizer Status 38 nvoMcQAHUStatus N/A 0=Enabled, 1=None, 2=Off Amb, 3=Off Alarm (Not Used), 4=Off Net, 5=Off Man

Cooling Capacity 33 nvoUnitStatus 112 nvoUnitStatus.cool_output(%)

Heating Capacity 43 nvoUnitStatus 112 nvoUnitStatus.heat_output_primary(%)

Supply Fan Capacity 72 nvoUnitStatus 112 Fan_Output Current supply fan capacity (%)

Return/Exhaust Fan Capacity 68 nvoExhFanStatus 95 Current return or exhaust fan capacity (%)

Economizer Capacity 36 nvoUnitStatus 112 Economizer_Output Feedback value (%)

Emergency Override 40 nviEmergOverride 103 0=NORMAL, 4=SHUTDOWN, 0xFF=NUL (other states not used)

Application Mode 29 nviApplicMode 108 0=AUTO, 1=HEAT, 3=COOL, 6=OFF, 9=FAN_ONLY (other states not used)

Occupancy Occupancy 57 nvoEffectOccup 109 0=OCCUPIED, 1=UNOCCUPIED,

2=BYPASS, 3=STANDBY, 0xFF=NUL Occupancy Mode 58 nviOccManCmd 109 0=OCCUPIED, 1=UNOCCUPIED, 2=

BYPASS, 3=STANDBY, 0xFF=NUL Temperature Discharge Air Temperature 35 nvoDischAirTemp 105 Current reading of sensor

Return Air Temperature 68 nvoRATemp 105 Current reading of sensor

Space Temperature 71 nvoSpaceTemp 105 Current reading of sensor

Outdoor Air Temperature 62 nvoOutdoorTemp 105 Current reading of sensor

Entering Fan / Leaving Coil Temp 40 nvoEFT_LCT 105 Current value of sensor

Entering Water Temperature 42 nvoCWTemp 105 Current value of sensor

Mixed Air Temperature 54 nvoMATemp 105 N/A Current value of sensor

Mixed Air Temperature 54 nvoMixedAirTemp 105 N/A Current value of sensor

Flow Summary Return/Exhaust Fan Status 69 nvoExhFanStatus 95 State: 0=Off, 1=On , -1(0xFF)=Undefined

VAV Box Output 78 nvoVAVBoxOut N/A N/A 0=Heat (Off), 1=Cool (On)

SAF Spd Control Duct Static Pressure 35 nvoDuctStatPress 113 N/A Current reading of sensor. If unit has two

sensors the lower of the two is displayed Duct Static Pressure Setpoint 36 nviDuctStaticSP 113 N/A Default = 1.00” WC

Remote Supply Fan Cap Control Flag 68 nviSupFanCtrl N/A 0=Duct Press, 1=Speed

Supply Fan Capacity Input 73 nviSupFanCap 81 N/A Default = 25% Sets the discharge air VFD speed when Supply Fan Capacity Control Flag is set to Speed

RF/EF Spd Control Building Static Pressure 31 nvoBldgStatPress 113 Current reading of sensor value

Building Static Pressure Setpoint 31 nviBldgStaticSP 113 Default = 0.050” WC

Remote Return/Exhaust Fan Cap Control Flag

67 nviExhRetFanCtrl N/A 0=None, 1=Tracking, 2=Bldg Press, 3=Speed

Return Fan Capacity Input 69 nviRetFanCap 81

26 ED15112-5

Network Control Property Keypad attributes available as LONWORKS Variables for network control of the unit


Exhaust Fan Capacity Input 43 nviExhFanCap 81

Cooling Occupied Cooling Setpoint 60 nciSetpoints

SCPTsetPnts 106/60 Occupied_Cool Default = 72°F / 22.22°C

Unoccupied Cooling Setpoint 75 nciSetpoints SCPTsetPnts

106/60 Unnoccupied_Cool Default = 85°F / 29.44°C

Discharge Air Cooling Setpoint 54 nviDAClSP 105 N/A Default = 55°F (32-86°F) / 12.78°C

Minimum Discharge Air Cooling Setpoint

53 nciDAClSP 105 N/A Used to set the discharge air cooling setpoint via the network.

Evaporator Condensing Conductivity 32 nvoConductivity N/A This variable provides the conductivity of the

water in the sump of an evaporative cooled condener.

Min OA Damper Space CO2 70 nvoSpaceCO2 29 0-5000ppm

Outdoor Airflow 62 nvoOAFlow 15

Heating Occupied Heating Setpoint 61 nciSetpoints

SCPTsetPnts 106/60 Occupied_Heat Default = 68°F / 20°C

Unoccupied Heating Setpoint 76 nciSetpoints SCPTsetPnts

106/60 Unoccupied_Heat Default = 55°F / 12.78°C

Discharge Air Heating Setpoint 55 nviDAHtSP 105 N/A Default = 100°F (50-158°F) / 37.78°C

Maximum Discharge Air Heating Setpoint

52 nciDAHtSP 184 N/A

Dehumidification Relative Humidity 66 nvoSpaceRH 81 Value of optional relative humidity sensor or

network input Dew Point Temperature 34 nvoSpaceDewPt 105 Indicates current calculated dew point

(calculated from Relative Humidity) Relative Humidity Setpoint 67 nviSpaceDehumSP 81

Dew Point Setpoint 34 nviSpaceDewPtSP 105

Reheat Capacity 65 nvoUnitStatus 112 nvoUnitStatus.heat_output_secondary(%)

LONWORKS Setup Receive Heartbeat 65 nciRcvHrtBt

SCPTmaxRcvTime 107/48 Default is 0 seconds

Send Heartbeat 70 nciSndHrtBt SCPTmaxSendTime

107/49 Default is 60 seconds

Network Variables Outdoor Air Temperature Input 62 nviOutdoorTemp 105 Network input of Outdoor Air Temp (–10°C to

50°C) Space Temperature Input 72 nviSpaceTemp 105 Network input of Space Temp (–10°C to 50°C)

Occupancy Scheduler Input 59 nviOccSchedule 128 Network schedule

Primary Cool Enable 63 nviPriCoolEnable 95 Enables or disables cooling via two properties: State=0, cooling disabled State=1 and Value=0, cooling disabled State=1 and Value>0, cooling enabled State=-1, network is not cooling economizer

Primary Heat Enable 64 nviPriHeatEnable 95 Enables or disables heating via two properties: State=0, heating disabled State=1 and Value=0, heating disabled State=1 and Value>0, heating enabled State=-1, network is not effecting heating

Economizer Enable 37 nviEconEnable 95 Enables or disables economizer via two properties: State=0, economizer disabled State=1 and Value=0, economizer disabled

ED15112-5 27

Network Control Property Keypad attributes available as LONWORKS Variables for network control of the unit


State=1 and Value>0, economizer enabled State=-1, network is not effecting economizer

Waterflow Switch Input 78 nviCWFlow 95

Space IAQ Input 71 nviSpaceIAQ 29 This input may be set by the network and is used for minimum OA damper control (0-5000 PPM).

Relative Humidity Input 66 nviSpaceRH 81 Network input

Temperature Setpoint Input 73 nviSetpoint 105 Adjusts effective heat enable and effective cool enable setpoint via the network. Effective Heat SP = nviSetpoint – 0.5 (Occupied_Cool – Occupied_Heat). Effective Cool SP = nviSetpoint + 0.5 (Occupied_Cool – Occupied_Heat).

Outdoor Air Damper Min Position Input

61 nviOAMinPos 81 Current OA damper min position setpoint (%)

Effective Enable Setpoint 39 nvoEffectSetpt 105 Current enable setpoint which the unit will use.

HVAC Unit Type Identifier 46 nciHvacType SCPThvacType

145/169 N/A Equipment Type = HVT_GENERIC (Read Only)

Active Alarms Clear Alarms 83 nviClearAlarms N/A 0=None, 1=Clear All Faults, 2=Clear All

Problems, 3=Clear All Warnings, 4=Clear All Alarms

Non-Keypad Variables Local Space Temperature 49 nvoLocalSpaceTmp 105 Current reading of the local space sensor

Local OA Temperature 49 nvoLocalOATemp 105 Current reading of the local outdoor air temperature sensor

Effective Discharge Setpoint 38 nvoEffDATempSp 105 N/A Current discharge air setpoint which the unit will use.

Minimum Send Time 53 nciMinOutTm SCPTminSendTime

107/52 Defines min period of time between automatic network variable output time (reducing traffic on network)

Warning Alarm 88 nvoWarnAlarm N/A 0=No Active Warnings, 24=Dirty Filter, 28=Airflow Sw, 32=Conductivity

Problem Alarm 89 nvoProbAlarm N/A 0=No Active Problems, 137=Waterflow Sw, 140=