Manuals+

Installation and Maintenance Manual

IM 969-6

Group: Controls
Part Number: IM 969
Date: April 2022

MicroTech® III Chiller Unit Controller Modbus® Communication Module

Compatible Chiller Models:

Introduction

This manual provides information on the network integration system used with MicroTech III unit controllers on Daikin Applied chillers. It details the installation or replacement of a Modbus communication module and explains how to configure network parameters for communication between the chiller and the Modbus network.

Revision History

Document IDDateDescription
IM 969Jan 2010Initial release.
IM 969-1Oct 2010Updated screen image, reference to OMM 998 to OM 1051, Baud Rate location in Table 1, added Model AGZ-D.
IM 969-2Jul 2011Updated Table 1 baud rates, note, and default response delay time.
IM 969-2Mar 2012Updated Daikin McQuay logo and references.
IM 969-3Jan 2017Updated Daikin Applied brand logo and references, document part numbers, formatting, hardware/HMI images, and troubleshooting details.
IM 969-4Mar 2017Added AMZ chiller model to data tables and references.
IM 969-5Jan 2018Added WME & WWV chiller models.
IM 969-6Apr 2022Updated firmware version, modified Network Parameters table.

Reference Documents

CompanyNumberTitleSource
Daikin AppliedIOM 1242Pathfinder Model AWV Air Cooled Chiller Installation, Operation, and Maintenance Manualwww.DaikinApplied.com
Daikin AppliedIOM 1206Trailblazer® Model AGZ Air Cooled Chiller Installation, Operation and Maintenance Manualwww.DaikinApplied.com
Daikin AppliedIOM 1207Trailblazer® Model AGZ Air Cooled Chiller Installation, Operation and Maintenance Manual - Pump Package and Remote Evaporatorwww.DaikinApplied.com
Daikin AppliedIOM 1243Trailblazer Model AMZ Air Cooled Chiller Installation, Operation, and Maintenance Manualwww.DaikinApplied.com
Daikin AppliedIOM 1264Navigator Model WWV Water-cooled Chiller Installation, Operation, and Maintenance Manualwww.DaikinApplied.com
Daikin Applied (Legacy)IOM 1202Pathfinder® Model AWS Air Cooled Chiller Installation, Operation, and Maintenance Manualwww.DaikinApplied.com
Daikin Applied (Legacy)IOMM 1033-6Magnitude Model WME, B vintage Magnetic Bearing Centrifugal Chiller Installation, Operation, and Maintenance Manualwww.DaikinApplied.com
Daikin AppliedED 15121MicroTech III Chiller Unit Controller Protocol Information, Modbus Networkswww.DaikinApplied.com
ModbusN/AModbus over Serial Line Specification and Implementation Guide, v1.0www.Modbus.org

Software Revision

This document supports Board Support Package (BSP) Modbus communication module firmware version 10.14 and all subsequent versions unless otherwise specified.

Limited Warranty

Consult your local Daikin Applied representative for warranty details. To find your local Daikin Applied representative, visit www.DaikinApplied.com.

Hazardous Information Messages

Recognize Safety Symbols, Words and Labels

The following symbols and labels are used throughout this manual to indicate immediate or potential hazards. It is the owner and installer's responsibility to read and comply with all safety information and instructions accompanying these symbols. Failure to heed safety information increases the risk of property damage, product damage, serious personal injury, or death. Improper installation, operation, and maintenance can void the warranty.

CAUTION

Cautions indicate potentially hazardous situations, which can result in personal injury or equipment damage if not avoided.

Static sensitive components: Can cause equipment damage. Discharge any static electrical charge by touching bare metal inside the control panel before performing service. Never unplug cables, circuit board terminal blocks, or power plugs while power is applied.

WARNING

Warnings indicate potentially hazardous situations, which can result in property damage, severe personal injury, or death if not avoided.

DANGER

Dangers indicate a hazardous situation which will result in death or serious injury if not avoided. Electric shock hazard. Can cause personal injury or equipment damage. This equipment must be properly grounded. Connections and service must be performed only by personnel knowledgeable in the operation of the equipment being controlled.

NOTICE

This equipment generates, uses, and can radiate radio frequency energy. If not installed and used according to this manual, it may cause interference to radio communications. It complies with FCC Part 15 limits for Class A digital devices, providing reasonable protection against harmful interference in a commercial environment. Operation in a residential area may cause interference, requiring the user to correct it at their own expense. Daikin disclaims liability for interference or its correction.

Features

  • Integration into a building automation and control system via Modbus RTU.
  • Simple attachment to a MicroTech III chiller unit controller.
  • LEDs indicate communication status and network activity.
  • Network addressing and baud rate set directly from the unit controller.
  • Circuit board components enclosed in protective housing.

Specifications

General

ParameterValue
Dimensions (W x H x D)1.77 x 4.33 x 2.95 in (45 x 110 x 75 mm)
Weight3.5 oz (98 g)
MaterialBase - plastic, pigeon-blue; Housing - plastic, light-gray
Operating Temperature-40 to 158°F (-40 to 70°C)
Humidity<90% RH
Atmospheric pressureMin. 10 psi (70kPa), corresponding to max. 9,842 ft (3,000 m) above sea level

Storage and Transportation

ParameterValue
Temperature-40 to 158°F (-40 to 70°C)
Humidity<95% RH
Atmospheric pressureMin. 3.77 psi (26 kPa), corresponding to max. 32,808 ft (10,000 m) above sea level

Electrical

ParameterValue
PowerSupplied via unit controller; DC 5 V (+5% / -5%), max. 270 mA
Network connectionRS-485 (EIA-485) - T1 and T2; 3-wire twisted pair, shielded, galvanically isolated
Bus connection/Transceiver+, -, REF (3 wires); Isolated transceiver with fail-safe circuitry
Bus termination1/8 Unit load
Baud rate4800, 9600, 19200, and 38400; configurable via software

Additional Components

ComponentDescription
Board-to-board connector10-pin plug connecting the communication module and unit controller.
Modbus network connectorRS-485 connection plug, 3-pin spring cage top entry.

Agency Listings

RegionListings
USUL916, UL873
CanadaCSA C22.2M205
EuropeEMC directive 2004/108/EC; Low-voltage directive 2006/95/EC
RoHSDirective 2002/95/EC

Dimensions

The module dimensions are 1.77 x 4.33 x 2.95 inches (45 x 110 x 75 mm). The top view shows the RS485, BSP, and BUS connectors. The side view shows certifications like UL and CE.

Component Data

The Modbus communication module is a printed circuit board with a plastic enclosure. It connects to the left side of the MicroTech III chiller unit controller or an existing module.

Figure 3: Modbus Communication Module Attached to Unit Controller: Depicts the module physically connected to the chiller unit controller.

Figure 4: Modbus Communication Module: Highlights the module's features, including RS-485 Network Connectors (Channel 0 and Channel 1), BUS LED, and BSP LED.

Light Emitting Diodes (LEDs)

The module features a BSP LED and a BUS LED to indicate communication status and activity when connected and powered.

BSP LED

The BSP LED indicates the communication state between the module and the unit controller.

Table 1: BSP LED Activity

BSP LED ColorDescription
Alternating red and green flashing (1 Hz)Board Support Package (BSP) firmware upgrade in progress.
GreenBSP is running. Communication is established between the unit controller and the communication module.
YellowModule is capable of communicating, but communication is not established.
Red flashing (2 Hz)BSP (software) error.
RedHardware error.

Note: For BSP or Red LED errors, cycle power to the unit controller. Contact Daikin Applied Controls Customer Support at 866-462-7829 if issues persist.

BUS LEDs

The BUS LED indicates communication status between the module and the Modbus network.

Table 2: BUS LED Activity

BUS LED ColorDescription
GreenThe unit controller is communicating to the network.
YellowCommunication module is initializing.
RedCommunication error or timeout has expired. The unit controller is not communicating to the network.

Note: If the Com LED Timeout parameter is set to 0, the timeout feature is disabled, and the BUS LED remains green even during communication errors.

Modbus Network Connector

An RS-485 connection port connects the module to the Modbus Network. It has three pins: +, -, and Ref. The module has two RS-485 ports, but only the top connector (Channel 0) is used.

Board-To-Board Connector

The 10-pin board-to-board connector links the MicroTech III chiller unit controller to the Modbus communication module.

Figure 5: Board-to-Board Connector: Illustrates the 10-pin connector with its elements.

Installation

Installation and Mounting

This section details how to field install or replace a Modbus communication module on the MicroTech III chiller unit controller.

CAUTION

Electrostatic discharge hazard. Can cause equipment damage. This equipment contains sensitive electronic components. Discharge static potential by touching a grounded object (e.g., metal enclosure) before handling the module.

WARNING

Electric shock hazard. Can cause personal injury or equipment damage. This equipment must be properly grounded. Connections and service must be performed by knowledgeable personnel only.

Field Installation Kit

The Modbus communication module field-installed kit includes:

  • The Modbus communication module with RS-485 network connector.
  • Board-to-board connector (refer to Figure 5).
  • This manual (IM 969).

Installing a new Communication Module

Follow these steps to install a Modbus communication module:

  1. Disable the chiller: Set the Unit On/Off Switch to "Off" inside the control panel. (Refer to Figure 6 for switch location).
  2. Remove power from the unit controller.
  3. Remove knockout strip: Carefully remove the blue plastic knockout strip from the far left end of the unit controller (or existing module). Use a small flathead screwdriver inserted into the tab at the bottom of the unit controller to gently pull the screwdriver away. (Refer to Figure 7).
  4. Remove module knockout strip: Carefully remove the blue plastic knockout strip from the right side of the Modbus communication module.
  5. Insert board-to-board connector: Insert the board-to-board connector into the Modbus communication module. Ensure baffles align with corresponding slots. (Refer to Figure 7 and Figure 8).
  6. Connect to unit controller: Insert the other end of the board-to-board connector into the far-left side of the unit controller or other attached module.
  7. Insert network cable: Connect the network cable to the Modbus communication module's top network connector, Channel 0 (Figure 4).
  8. Apply power: Apply power to the unit controller. The unit controller will automatically reset itself in approximately 30 seconds to synchronize with the module.
  9. Enable the chiller: Set the Unit On/Off Switch to "On" from inside the control panel.

Replacing a Communication Module

Follow these steps to remove and replace an existing Modbus communication module:

  1. Disable the chiller: Set the Unit On/Off Switch to "Off" inside the control panel. (Refer to Figure 6).
  2. Remove power from the unit controller.
  3. Locate the module: Identify the Modbus communication module to the left of the unit controller (Figure 3).
  4. Disconnect network cable: Gently pull the network cable connector from the module (Figure 4).
  5. Remove the module: Grasp the module and carefully pull it from the unit controller or adjacent module.
  6. Install the new module:
    • Carefully remove the blue plastic knockout strip from the right side of the new module.
    • Insert the board-to-board connector into the new module, ensuring baffles align with slots (Figure 7 and Figure 8).
  7. Connect to unit controller: Insert the board-to-board connector into the far-left side of the unit controller or other attached module.
  8. Insert network cable: Connect the network cable to the module's top network connector, Channel 0 (Figure 4).
  9. Apply power: Apply power to the unit controller. The unit controller will automatically reset in approximately 30 seconds to synchronize with the module.
  10. Enable the chiller: Set the Unit On/Off Switch to "On" from inside the control panel.

Network Configuration

This section guides you through configuring the Modbus communication module for BAS network integration using the MicroTech III chiller unit controller.

Network Considerations

Standard Modbus network rules apply. The network is a daisy-chain of controllers (master and slaves). It is recommended to terminate each end of the network with a 120-ohm characteristic impedance. Refer to Modbus specifications at www.Modbus.org.

Modbus Configuration

Configuration is done via the unit controller's keypad/display. The Modbus network address (ident number) and transmission (baud) rate must be set.

Note: The network address must be within the range of 1-247, and the baud rate must be verified for proper communication. These parameters are accessible only when the module is correctly attached.

The configuration procedure involves disabling the chiller, entering a password, setting network address and baud rate, configuring other parameters, saving changes, and enabling the chiller.

Disable the Chiller

Set the Unit On/Off Switch to "Off" from inside the control panel (See Figure 6).

Enter Password

If not already at the Main Menu, navigate to it using the Back button. Turn the circular knob to highlight "Enter Password" and press Enter. Enter the password "5321" and press Enter. Scroll to "View/Set Unit" and press Enter.

Figure 9: Unit Controller Main Features: Shows the Back button and Circular knob for navigation.

Figure 10: Modbus Setup Menu: Enter Password: Displays the menu screen for password entry.

Set the Network Address

  1. Ensure the chiller is disabled and the password is entered.
  2. Scroll to "Modbus Setup" and press Enter.
  3. Scroll to "Address" and press Enter (Figure 11). Enter the address specified by the BAS network administrator.
  4. Press Enter to confirm.
  5. Proceed to set the baud rate. If the baud rate does not need changing, proceed to "Set Additional Network Parameters" or "Save Changes and Cycle Power".

Figure 11: Modbus Setup Menu: Network Address: Shows the menu for setting the network address.

Note: The Modbus Setup menu appears only if the communication module is installed correctly. If it does not appear, cycle power to the unit controller and repeat the configuration process.

Set the Baud Rate

WARNING: Electric shock hazard. Ensure proper grounding. Service by knowledgeable personnel only.

  1. Ensure the chiller is disabled and the password is entered.
  2. Scroll to "Modbus Setup" and press Enter.
  3. Scroll to "Baud Rate" and press Enter. Select the desired baud rate. (Figure 12 shows 19200 bps).

Figure 12: Modbus Setup Menu: Change Baud Rate: Displays the menu for changing the baud rate.

Note: The default baud rate is 38400 bps.

Set Additional Network Parameters

Adjust other network parameters as shown in Table 3.

  1. Disable the chiller and enter the password if not already done.
  2. Scroll to "Modbus Setup" and press Enter.
  3. Scroll to the desired menu item and press Enter.
  4. Change the value and press Enter to confirm.
  5. Repeat steps 2-4 for all desired parameters.

Save Changes and Cycle Power

  1. Scroll to "Apply Changes" and set to "Yes" to save changes and cycle power to the unit controller (Figure 11).
  2. Navigate back to the Modbus Setup menu to verify settings. The module may take a minute to power up.
  3. Set the Unit On/Off Switch to "On" from inside the control panel.

Note: Refer to the applicable MicroTech III Chiller Unit Controller Operation Manual for detailed keypad/display operations. Systems integrators should consult Protocol Document ED 15121 for Modbus register descriptions. Visit www.DaikinApplied.com.

Configurable Parameters

Table 3 lists network parameters available via the unit controller's keypad/display.

Table 3: Network Parameters

ParameterRange/DefaultDescription/Notes
Apply ChangesYes or No (Default: No)Setting to Yes cycles power to the unit controller to apply network changes.
Network Address1,21-247 (Default: 1)The unique Modbus Address for the communication module on the network.
Baud Rate1,24800, 9600, 19200, 38400 (Default: 38400)Data transfer speed (bps) of the Modbus network.
Parity1Even = 0, Odd = 1, None = 2 (Default: None)Defines parity for detecting transmission errors. Must be identical for all nodes.
Two Stop Bits1Yes or No (Default: Yes)Defines the number of stop bits (Yes=2, No=1). Must be coordinated with other bus nodes.
Load ResistorYes or No (Default: No)Set to Yes if this unit is the first or last slave on the segment. Set to No if an external terminating resistor is used.
Response Delay10-30000 milliseconds (Default: 5 milliseconds)Delays response to avoid master device over-run. Adjust if the master is too slow.
Com LED Timeout0-3600 seconds (Default: 3 seconds)If set to 0, the BUS LED is always green. If the master does not poll within this time, the BUS LED turns red.
Modbus BSP9.18 or newerBoard Support Package version. Read-only.

1 Parameter configured via unit controller keypad/display.
2 Boldface indicates required parameters for minimum network configuration.

Note: If unit controller application software requires an upgrade, network configuration parameters revert to defaults. Contact Chiller Technical Response Center at 540-248-9239 (techresponse@daikinapplied.com) for assistance.

Parts and Service

Troubleshooting

General

  • Review the Installation and Mounting section to confirm procedures were followed.
  • Review the Network Configuration section to confirm procedures were followed.
  • If module LEDs are inactive after installation, remove the module, follow "Installing a new Communication Module" steps, and replace the module if the issue persists.
  • Verify the Modbus Setup menu appears. If not:
    • Set Unit On/Off Switch to "Off".
    • Remove power, wait 10 seconds, then re-power. The controller should recognize the module within 45 seconds.
    • Verify the Modbus Setup menu is now visible.

Network Parameters

  • Verify the Modbus communication module's network address is unique. Baud rate, stop bit, and parity must match other slave devices.
  • Ensure no duplicate devices exist and network parameters are set correctly per Table 3.
  • Check the BUS and BSP LEDs for communication status as explained in Table 1 and Table 2.

Network wiring

For unsatisfactory performance or issues like noise/slow transmission:

  • Ensure the shield is landed at only one point in the trunk.
  • Use a daisy-chain topology (no T-Taps or ring layout).
  • Network wiring should not exceed 4000 ft total distance limit (without repeaters) at 38400 bps baud.
  • Verify polarity is maintained.
  • Ensure end-of-line termination resistors (120 Ω) are at the first and last device on the trunk, as required by EIA-485.
  • Avoid strong sources of electromagnetic interference (EMI).
  • The two-wire bus must be connected correctly and is not interchangeable.
  • Ensure the network trunk is not located near a DC load switch (relay).

Network Performance

If network traffic is slow, intermittent, or noisy, use a network protocol analyzer or oscilloscope to identify the source of poor performance.

Confirm power is applied to the unit controller.

Contact Daikin Applied Controls Customer Support at 866-462-7829 for assistance.

Parts

Table 4: Replacement Parts List

DescriptionPart Number
MicroTech III Modbus communication module kit (includes module, board-to-board connector, network connector, and IM 969)350147413
Network connector (3-pin)193410303
Board-to-board connector (10-pin)300047027

To find your local parts office, visit www.DaikinApplied.com or call 800-37PARTS (800-377-2787).

Daikin Applied Training and Development

For training on Daikin HVAC products, visit www.DaikinApplied.com and click on Training, or call 540-248-9646 and ask for the Training Department.

Warranty

All Daikin equipment is sold under standard terms and conditions, including Limited Product Warranty. Consult your local Daikin Applied Representative for warranty details. Find your representative at www.DaikinApplied.com.

Aftermarket Services

For local parts offices, visit www.DaikinApplied.com or call 800-37PARTS (800-377-2787).

For local service offices, visit www.DaikinApplied.com or call 800-432-1342.

This document contains the most current product information as of this printing. For the latest information, please go to www.DaikinApplied.com.

Products manufactured in an ISO Certified Facility.

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