Lochinvar KEB 0015 Installation Manual
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Lochinvar KEB 0015 Installation Manual

Lochinvar KEB 0015 Installation Manual

Modbus and bacnet communication
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100389961_2000844370_Rev A
MODBUS AND BACNET
COMMUNICATION
INSTRUCTIONS
Models:
KEB 0015 - 0150
This manual must only be used by a
⚠ WARNING
qualified heating installer / service
technician. Read all instructions,
including this manual, the Installation
and Operation Manual, and the Service
Manual, before installing. Perform
steps in the order given. Failure to
comply could result in severe personal
injury, death, or substantial property
damage.
Save this manual for future reference.

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  • Page 1 100389961_2000844370_Rev A MODBUS AND BACNET COMMUNICATION INSTRUCTIONS Models: KEB 0015 - 0150 This manual must only be used by a ⚠ WARNING qualified heating installer / service technician. Read all instructions, including this manual, the Installation and Operation Manual, and the Service Manual, before installing.

  • Page 2: Table Of Contents

    The information contained in this manual provides general guidelines for the implementation of ModBus and BACnet communication with the Lochinvar Lectrus boiler (KEB0015 - 0150). All ModBus networks are implemented utilizing a master-slave arrangement where all boilers/water heaters are slaves and the master is a building automation system capable of communicating over a RS-485 half duplex serial connection.

  • Page 3: Installation

    ModBus and BACnet Communication Instructions Installation To gain access to the interior of the Figure 2-3 Modbus/BAcnet board appliance: Turn OFF the main electrical power to the appliance and BOARD disconnect all electrical circuits. MOUNTED With a flat head screwdriver open the door. You may remove the door from its hinges for convenience (Figure 1).
  • Page 4 ModBus and BACnet Communication Instructions Installation Figure 2-4 Make connections 100379788 TO X1 TO CN-9 TO X6 TO X4 100376520 DISCONNECT TO BIC X9 FROM BIC X9 BLACK L- 120V WHITE N- 120V GREEN BLACK 2000813409 02...

  • Page 5: Modbus Configuration

    ModBus and BACnet Communication Instructions ModBus Configuration The ModBus communication board is equipped with a set of ten dip switches that are used to set the board configuration (address, baud rate, and parity settings). The first eight are used to set the address of each board. The ninth is baud rate. The tenth is parity. Figure 3-1_ModBus Communication Board DIP SWITCHES LED’S...

  • Page 6: Timing Specifications

    RTU has been chosen to be used 0 = 9600 bps with all Lochinvar ModBus communication. Please ensure that the master device is transmitting ModBus RTU. Each message is started by at least 3.5 character times of silence.

  • Page 7: Modbus Function Set

    ModBus and BACnet Communication Instructions ModBus Configuration ModBus Function Set Function Sub Function Description Read Coil Status Read Input Status Read Holding Registers Read Input Registers Force Single Coil Preset Single Register Read Exception Status Diagnostic - Return Query Data Diagnostic - Restart Communication Diagnostic - Return Diagnostic Register Diagnostic - Force Listen Mode...

  • Page 8: Modbus Exception Codes

    ModBus and BACnet Communication Instructions ModBus Configuration (continued) ModBus Exception Codes MODBUS Exception Codes Code Name Meaning The function code received in the query is not an allowable action for the server (or slave). This may be because the function code is only applicable to newer ILLEGAL FUNCTION devices, and was not implemented in the unit selected.

  • Page 9: Modbus Memory Map Primary Data Tables

    ModBus and BACnet Communication Instructions ModBus Memory Map Primary Data Tables Table Data Type Read / Write Discrete Inputs Single Bit Read Only Coils Single Bit Read / Write Input Registers 16-Bit Word Read Only Holding Registers 16 Bit Word Read / Write Memory Map Coils...

  • Page 10: Holding Registers

    ModBus and BACnet Communication Instructions ModBus Memory Map (continued) Memory Map Holding Registers Address Description Default Unit Min. Max. Resolution 40001 Configuration 65535 40002 BV 0-4 65535 40003 0-10 BMS Degrees Celsius 40004 Tank Setpoint Degrees Fahrenheit 40005 Tank Temperature Degrees Celsius 40006 Outdoor Temperature...

  • Page 11: Bacnet Configuration

    Modbus Instructions ModBus and BACnet Communication Instructions BACNET Configuration The BACnet communication board is equipped with a set of ten dip switches that are used to set the board configuration (address and baud rate). The first eight are used to set the address of each board. The ninth and tenth are baud rate. Figure 5-1_Communication Board DIP SWITCHES LED’S...

  • Page 12: Timing Specifications

    Modbus Instructions ModBus and BACnet Communication Instructions BACnet Configuration (continued) Timing Specifications Communication Board Diagnostics The Communication board is equipped with three LED’s for The baud rate for the BACnet board is selectable with Dip visual diagnostics: Two yellow LED’s and one green. One switches #9 and #10.

  • Page 13: Primary Data Tables

    ModBus and BACnet Communication Instructions BACnet MSTP Memory Map Primary Data Tables Object Type Data Type Read / Write Binary Input (BI) Single Bit Read Only Binary Value (BV) Single Bit Read / Write Analog Input (AI) 16-Bit Word Read Only Analog Value (AV) 16 Bit Word Read / Write...

  • Page 14: Bacnet Memory Map

    Modbus Instructions ModBus and BACnet Communication Instructions Wiring Requirements BACnet Memory Map (continued) (continued) Memory Map (continued) Object Gas Object Name Electric Object Name Address Unit Resolution Type Firing Rate Modulation Rate Boiler Pump Speed Boiler Pump Speed Boiler Status Code Boiler Status Code none 65535...

  • Page 15: Physical Wiring

    Modbus Instructions ModBus and BACnet Communication Instructions Wiring Requirements Note that when the System Supply Temperature and/or the Tank Temperature are provided by the BAS, they need to be refreshed every few seconds. This is required in order to prevent unwanted fluctuations in these temperatures. If these values are not provided every few seconds (timeout is programmable), the boiler will revert to its own internal control.

  • Page 16: Control Inputs/Outputs

    ModBus and BACnet Communication Instructions Wiring Requirements (continued) Figure 7-2_Control Inputs SYSTEM PUMP SPEED CONTROL LOW PRESSURE SWITCH DHW DEMAND DEMAND ENABLE CONNECTION FLOW SWITCH BOARD 2000810819 00 SYSTEM SUPPLY SENSOR OUTDOOR SENSO TANK SENSOR SEQUENCER / BUILDING MA NAGMENT SYSTEM EXTERNAL LOW WATER CUTOFF...

  • Page 17: Control Location

    ModBus and BACnet Communication Instructions Wiring Requirements Figure 7-3_Control Outputs Control outputs ALARM BELL CONNECTION BOARD RUN TIME CONTACTS 2000810819 00 BUILDING MANAGEMENT SYSTEM BOILER PUMP SYSTEM PUMP DHW PUMP 2000810819 00 2000811873 00 2000811873 00 2000811873 00 2000811873 00 2000811873 00 SMART CONTROL MODULE...

  • Page 18: Typical Boiler/Water Heater System Wiring

    ModBus and BACnet Communication Instructions Wiring Requirements (continued) Typical Boiler/Water Heater System Wiring Physical Configuration: Cascade without Individual Monitoring Modbus / BACnet RS485 Port on Gateway or Building System Modbus / BACnet RS485 Communication Bus LEADER MEMBER 2 MEMBER 1 MEMBER 3 Cascade Daisy Chain Connection You will need a Modbus or BACnet board only for the Leader.

  • Page 19: Unit Operation

    BMS communication be interrupted longer than the ModBus timer. The timer is reset every time a write command is received with updated temperatures or commands. It is the recommendation of Lochinvar that this timer be set to the shortest value possible.
  • Page 20 ModBus and BACnet Communication Instructions Unit Operation (continued) Control Mode 2 In this configuration the unit is controlled by setting the set points locally on the boiler/water heater and providing an enable signal and a rate command through ModBus or BACnet communications. The BMS Type will be 0 - 100% of modulation or a temperature set point.
  • Page 21 ModBus and BACnet Communication Instructions Unit Operation Control Mode 2 - Set-up (Command Parameters) (continued) The holding registers/objects will need to be set as follows: Object Holding Registers Definition Bit Value (HEX) Action 40001 Configuration 00 05 Set Configuration to read 40002 & 3 40002 Enables unit (00 00 disables unit) Coils / BV...
  • Page 22 ModBus and BACnet Communication Instructions Unit Operation Control Mode 4 (DHW) Domestic Hot Water Generation (DHW) can be accomplished with one of two methods when a boiler/water heater is connected to a BAS system, DHW with direct control, and DHW with remote control. DHW with direct control: This is a typical installation with a hot water generator in close proximity to the boiler/water heater with the tank thermostat or the tank temperature sensor wired to the terminal strip of the unit.
  • Page 23 ModBus and BACnet Communication Instructions Unit Operation Cascade DEFAULT DEFAULT VALUES In order to operate the boiler/water heater in Cascade with PARAMETER ModBus or BACnet communications, configure the Leader Deg C Deg F Voltages unit per the control modes in this manual. Connect the BMS temperature set point at remaining boilers/water heaters in the Cascade through the low analog input...

  • Page 24: Unit Operation With Modbus Communications

    ModBus communication be interrupted longer than the ModBus timer. The timer is reset every time a ModBus write command is received with updated temperatures or commands. It is the recommendation of Lochinvar that this timer be set to the shortest value possible.
  • Page 25 ModBus and BACnet Communication Instructions Unit Operation Demand Configuration: ENABLE = ACTIVE; BMS = ACTIVE In this configuration the unit is controlled by providing an enable signal. The setpoint command will be determined by the parameters in the control and a rate command through ModBus or BACnet communications. The rate command will be 0 - 100% of modulation.
  • Page 26 ModBus and BACnet Communication Instructions Unit Operation DHW with remote control: This installation may or may not have the hot water generator in close proximity to the appliance. Its sensors and thermostat values are only available through the ModBus or BACnet communication bus. To ensure that the appliance can properly respond to a call for hot water generation the following holding registers must be set in addition to other commands: Object...
  • Page 27 ModBus and BACnet Communication Instructions Unit Operation Rate and Temperature Conversions: For Example: Rate Send a setpoint of 110°F. The formula to use for the interpolation is: When issuing a rate command the rate can be communicated as percent modulation or a desired setpoint, depending on Rate Command = the setting of the BMS Type in the BMS Setup Menu.

  • Page 28: Troubleshooting

    ModBus and BACnet Communication Instructions Troubleshooting Should you encounter problems communicating over Status Codes (Input Register 30014 or Analog Input AI13) ModBus, the following items should be checked in this order: 2 = Heat Demand blocked due to high absolute outlet Physical Layer temperature Communications Configuration and Port Settings...
  • Page 29 ModBus and BACnet Communication Instructions Troubleshooting Lockout Codes (Input Register 30016 or AI15) The lockout code is constantly changing NOTICE during operation and should not be used for lockout notification until the status code (Input Register 30014 or AI13) indicates a code of 40. 166 = EEPROM code Auto Reset High Limit 167 =...

  • Page 30: Diagrams

    ModBus and BACnet Communication Instructions Diagrams Figure 10-1 Ladder Diagram - 208V, 3 Phase 208 VAC 3 ɸ BOX DEPICTS Optional Current Transformers OPTIONAL ITEMS For Power Meter DISPLAY BOX DEPICTS DUAL SENSOR SINGLE HOUSING Relay Ground Fault Output Protector RED BLK BLU Main Voltage X7 - RIBBON...

  • Page 31: Ladder & Wiring Diagrams

    ModBus and BACnet Communication Instructions Diagrams Figure 10-2 Ladder Diagram - 240V, 1 Phase 240 VAC 1 ɸ DISPLAY Optional Current Transformers BOX DEPICTS For Power Meter OPTIONAL ITEMS BOX DEPICTS DUAL SENSOR SINGLE HOUSING Relay Ground Fault Output Protector RED BLK Main Voltage X7 - RIBBON...
  • Page 32 ModBus and BACnet Communication Instructions Diagrams (continued) Figure 10-3 Ladder Diagram - 400-600V, 3 Phase 480/600VAC 3 ɸ Optional Current Transformers DISPLAY BOX DEPICTS For Power Meter OPTIONAL ITEMS BOX DEPICTS DUAL SENSOR SINGLE HOUSING Relay Ground Fault Output Protector RED BLK BLU X7 - RIBBON DHW2...
  • Page 33 NOTES...
  • Page 34 NOTES...
  • Page 35 NOTES...

  • Page 36: Revision Notes

    Revision Notes: Revision A (PCP #3000063600 / CN #500049550) initial release. 100389961_2000844370_Rev A 03/25...

This manual is also suitable for:

Keb 0150

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