Crest Audio 1.5 Instructions Manual
  1. Manuals
  2. Brands
  3. Crest Audio Manuals
  4. Controller
  5. Sync Condensing Boiler 1.5
  6. Instructions manual
Crest Audio 1.5 Instructions Manual

Crest Audio 1.5 Instructions Manual

Modbus communication
Hide thumbs Also See for 1.5:
Table of Contents

Advertisement

Quick Links

Download this manual
FB-MODB Rev A
MODBUS COMMUNICATION
INSTRUCTIONS
Crest Models: 1.5 - 3.5
This manual must only be used
WARNING
by a qualifi ed 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.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 1.5 and is the answer not in the manual?

Questions and answers

Related Manuals for Crest Audio 1.5

Summary of Contents for Crest Audio 1.5

  • Page 1 FB-MODB Rev A MODBUS COMMUNICATION INSTRUCTIONS Crest Models: 1.5 - 3.5 This manual must only be used WARNING by a qualifi ed heating installer / service technician. Read instructions, including this manual, the Installation and Operation Manual, and the Service Manual, before installing.

  • Page 2: Table Of Contents

    Introduction The information contained in this manual provides general guidelines for the implementation of ModBus communication with the Lochinvar Crest boiler. All ModBus networks are implemented utilizing a master-slave arrangement where all Crest boilers are slaves and the master is a building automation system capable of communicating over a RS-485 serial connection.

  • Page 3: Configuration

    Confi guration The ModBus communication board is equipped with a set of ten dip switches that are used to set the board confi guration (address, baud rate, and parity settings). The fi rst eight are used to set the address of each board. The ninth is used to set the baud rate.

  • Page 4: Timing Specifi Cations

    1 = 19200 bps 0 = 9600 bps Each message is started by at least 3.5 character times of silence. The maximum delay between frames is 1.5 character times. When the system temperature and/or tank temperature is provided by the BAS to the boiler, it is critical that the temperature be updated every few seconds.

  • Page 5: Modbus Function Set

    Confi guration ModBus Function Set Function Sub Function (continued) 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 Diagnostic - Clear Counters and Diagnostic Registers...

  • Page 6: Modbus Exception Codes

    Confi guration ModBus Exception Codes Code Name ILLEGAL FUNCTION ILLEGAL DATA ADDRESS ILLEGAL DATA VALUE SLAVE DEVICE FAILURE ACKNOWLEDGE SLAVE DEVICE BUSY MEMORY PARITY ERROR GATEWAY PATH UNAVAILABLE GATEWAY TARGET DEVICE FAILED TO RESPOND MODBUS Exception Codes Meaning The function code received in the query is not an allowable action for the server (or slave).

  • Page 7: Memory Map Primary Data Tables

    Memory Map Primary Data Tables Table Discrete Inputs Coils Input Registers Holding Registers Crest Boiler Memory Map Address Description 00001 Boiler Enable 00005 Tank Thermostat 10001 Manual Reset High Limit 10002 Flow Switch 10003 Gas Pressure Switch 10004 Louver Proving Switch...

  • Page 8: Input Registers

    Confi guration Bits Address 40001 contains confi guration bits sent from the BAS to the boiler. These bits tell the boiler to use its own internal inputs, or inputs from the BAS. When a bit is set to 1, the boiler will ignore the corresponding value contained internally, and expect the BAS to write that value into the Holding Registers.

  • Page 9: Wiring Requirements

    This is required in order to prevent unwanted fl uctuations in these temperatures. If these values are not provided every few seconds (timeout is programmable), the boiler will revert to its own internal control. If neither of these temperatures is provided by the BAS, but any of the other control signals are being provided, the BAS will still need to refresh these inputs at least every 4 minutes.
  • Page 10 Wiring Requirements Figure 4-2_Control Inputs DHW THERMOSTAT / SENSOR ENABLING DEVICE CASCADE LOUVER PROVING SWITCH SYSTEM SENSOR - SUPPLY SYSTEM SENSOR - RETURN OUTDOOR SENSOR SEQUENCER / BUILDING MANAGMENT SYSTEM AUX SWITCH 1 & 2 0-10 INPUT FROM SYSTEM PUMP INLET TEMPERATURE SENSOR OUTLET TEMPERATURE /...
  • Page 11 CONNECTION BOARD LINE VOLTAGE TERMINAL STRIP ModBus Instructions 0-10V OUTPUT TO BOILER PUMP ALARM BELL LOUVER RELAY RUN TIME CONTACTS BOILER RATE OUTPUT SEQUENCER / BUILDING MANAGMENT SYSTEM BOILER PUMP CONTACTOR SYSTEM PUMP CONTACTOR HWG PUMP CONTACTOR IGNITOR BLOWERS GAS VALVES...

  • Page 12: Typical Boiler System Wiring

    Wiring Requirements Figure 4-4_Control Location MODBUS COMMUNICATION BOARD (MTR01) CONTROLLER Typical Boiler System Wiring Physical Configuration: Cascade without Individual Monitoring Modbus RS485 Port on Gateway or Building System Modbus RS485 Communication Bus Cascade Daisy Chain Connection ModBus Instructions...
  • Page 13 ModBus Instructions Wiring Requirements (continued) Physical Configuration: Cascade with individual Monitoring Modbus RS485 Port on Gateway or Building System Modbus RS485 Communication Bus Cascade Daisy Chain Connection Physical Configuration: Direct Control Modbus RS485 Port on Gateway or Building System Modbus RS485 Communication Bus...

  • Page 14: Unit Operation

    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 15: Hot Water Generation

    Hot Water Generation Hot water generation can be accomplished with one of two methods when a Crest boiler is connected to a BAS system, DHW with direct control, and DHW with remote control. DHW with direct control: This is the typical installation with a hot water generator in close proximity to the boiler with the tank thermostat, or tank temperature sensor, wired to the terminal strip of the unit.
  • Page 16 Unit Operation DHW with remote control: This installation may or may not have the hot water generator in close proximity to the boiler. Its sensors and thermostat values are only available through the ModBus communication bus. To ensure that the Crest boiler can properly respond to a call for hot water generation the following holding registers must be...
  • Page 17 A value of [00][31] in hexadecimal would be written to Holding register 40003 to issue a command for a 110°F setpoint. Temperature The Crest boiler passes temperature data in degrees Celsius. Also, to accommodate decimal places the decimal value must be divided by 10.

  • Page 18: Troubleshooting

    Unit Status Codes See Codes in this section Boiler Status The Crest boiler displays a boiler state code on the Building Screen to help aid in troubleshooting. indicates what the boiler is actually doing. This state should be compared to the command issued and what is expected.
  • Page 19 Troubleshooting Lockout Codes Description Analog to Digital converter input had changed too quickly Rapid Temperature Change on Pre-Mix Sensor 2 (S14) Rapid Temperature Change on Pre-Mix Sensor 1 (S13) Rapid Temperature Change on Pre-Mix Sensor 2 (S12) Rapid Temperature Change on Pre-Mix Sensor 1 (S11) Analog to Digital converter input is changed too quickly Rapid Temperature Change on Flue Sensor (S10) Rapid Temperature Change on Outlet Sensor (S9)
  • Page 20 Troubleshooting Lockout Codes Description Outlet Sensor Short Outlet Sensor Open Internal Error Internal Error Parameters Programmed Error while programming Parameters Internal Error Pre-Mix Sensors Temperature Differential Too High Flame Failure 2 Small Fan Speed Low Small Fan Speed High Flame Failure 1 Ignition Failure Flue Damper Open Small Blower Proving Switch Not Open...
  • Page 21 Troubleshooting Installation / Replacement Procedure Turn OFF the main electrical power to the appliance. Turn OFF the main manual gas shutoff to the appliance. Unplug the three (3) wire harnesses on the MTR01 control board (see FIG. 6-1). Unscrew the four (4) mounting nuts on the MTR01 control board and set aside.

  • Page 22: Diagrams

    120V SUPPLY "N" X1-3 1.5A EACH MAX X1-12 TERMINAL STRIP GROUND X1-1 SYSTEM PUMP SYSTEM PUMP RELAY CONTACTOR X1-2 INTEGRATED CONTROL BOILER PUMP BOLIER PUMP X8-20 RELAY CONTACTOR X1-4 X8-10 DHW PUMP DHW PUMP RELAY CONTACTOR X1-8 SMALL BLOWER X7-8...

  • Page 23: Wiring Diagram

    BOX DEPICTS OPTIONAL ITEMS BOX DEPICTS DUAL SENSOR SINGLE HOUSING LOW VOLTAGE 120 VAC HIGH VOLTAGE 1.5A EACH MAX SYSTEM PUMP CONTACTOR 120V SUPPLY BOILER PUMP CONTACTOR DHW PUMP CONTACTOR JUNCTION ON/OFF SWITCH GAS VALVE (SMALL) GAS VALVE (LARGE) SMALL BLOWER...

  • Page 24: Revision Notes

    Revision Notes: Revision A (ECO #C08179) initial release. FB-MODB Rev A 06/11...

This manual is also suitable for:

3.5

Table of Contents