Bosch Heatronic 4000 BAS Integration Manual
Brand: Bosch
Introduction
The Heatronic 4000 can communicate with a Building Automation System (BAS) using either BACnet® IP or Modbus®. This manual provides information on boiler plant and system parameters accessible when building automation or management systems utilize BACnet IP or Modbus communications. The Heatronic 4000 can be configured to provide controlled access or read/write access while controlling a target temperature from the BAS connection.
The BACnet IP terminal block features numbered connections (1-31) for various inputs such as Flow Proof, DHW, Fuel, EMS, and outputs for primary pumps, boilers, and DHW. It also includes terminals for Flow, Pressure, and Temperature sensors. The Modbus terminal block (40-42) is for A, B, and Ground connections.
Table of Contents
- Heatronic 4000 Configuration..................................................2
- Lock/Unlock Switch..................................................................2
- Application Mode Setting.........................................................2
- BAS Type Setting .....................................................................2
- BACnet Protocol Implementation Conformance Statement (PICS).......................................................................................3
- BACnet Connection .............................................................................3
- Setting BACnet in the Heatronic 4000 BAS Menu................4
- BACnet Analog Parameters....................................................6
- BACnet Binary Parameters...........................................................7
- Modbus Specification.......................................................................8
- Setting Modbus in the Heatronic 4000 BAS Menu..............9
- Modbus Parameters .......................................................................10
- Modbus Troubleshooting ......................................................................11
- Error Codes .................................................................................12
Heatronic 4000 Configuration
Ensure the Heatronic 4000 is set to the correct Application Mode and BAS setting before connecting to the BAS. To view menu options on the Heatronic 4000, press and hold the Home button for 3 seconds.
The navigation interface includes a [Home Button], [Item Back Button], [Next Button], and [Enter Button] for menu interaction.
Lock/Unlock Switch
The Heatronic 4000 has an 'Advanced' access level that allows unconditional access to all settings. To change from Installer or User access to Advanced level, the switch on the left side of the front display must first be set to the unlock position. The access level can be changed within the toolbox.
Application Mode Setting
The Application Mode of the Heatronic 4000 determines the options available to the BAS.
| Application Mode 4000 | BAS Operation |
|---|---|
| RSET (Outdoor Temperature Reset) | BAS Monitor Mode (BAS Monitor is set to ON). Remote control and adjustment of Heatronic 4000 settings. Refer to the BACnet® and Modbus® parameter tables in this manual for a list of available read/write parameters. |
| SETP (Set Point) | BAS Temperature Mode. Provides a setpoint temperature and heating demand commands for the Heatronic 4000. |
| DDHW (Domestic Hot Water) | Provides the required commands for the primary pumps and the DHW pump of the Heatronic 4000. |
| EMS (Energy Management System) | Remote control and adjustment of Heatronic 4000 settings. Refer to the BACnet® and Modbus® parameter tables in this manual for a list of available read/write parameters. |
| BAS (Building Automation System) | Provides the required commands for the primary pumps and the DHW pump of the Heatronic 4000. |
BAS Type Setting
Select the BAS connection type from the Heatronic 4000 BAS menu.
| BAS Type 4000 | BAS Operation |
|---|---|
| BACnet® IP | The 4000 communicates with BAS using BACnet over Internet and Protocol (IP). |
| Modbus® | The 4000 communicates with BAS using the Modbus protocol. |
BACnet Protocol Implementation Conformance Statement (PICS)
Vendor Name: Bosch Thermotechnology Corp.
Vendor ID: 744
Product Name: Heatronic 4000
Product Model Number: 4000
Application Software Version: J1229A
Firmware Version: 33
BACnet Protocol Revision: 10
Product Description: The Heatronic 4000 is a controller capable of operating four boilers to produce heat for multiple loads. The controller uses Proportional Integral Derivative (PID) logic to accurately maintain a target temperature and offer modern features, including the ability to communicate with a Building Automation System (BAS).
BACnet Normalized Device Profile (Annex L)
BACnet® Specific Application Controller (B-ASC)
Supported by BIBBs (Annex K)
| Name | Description |
|---|---|
| DS-RP-B | Data Sharing-Read Property-B |
| DS-RPM-B | Data Sharing-Read Multiple Properties-B |
| DS-WP-B | Data Sharing-Write Property-B |
| DM-DDB-B | Device Management-Dynamic Device Binding-B |
| DM-DOB-B | Device Management-Dynamic Object Binding-B |
| DM-DCC-B | Device Management-Communication Control-B |
The device communication control password is Bosch.
Segmentation Capability
| Supported | Window Size | |
|---|---|---|
| Capable of transmitting segmented messages | No | |
| Capable of receiving segmented messages | No |
Supported by Standard Object Types
| Can be created | Erased | |
|---|---|---|
| Analog Input | No | No |
| Analog Value | No | No |
| Binary Input | No | No |
| Binary Output | No | No |
| Binary Value | No | No |
Data Link Layer
| Supported | Device Address Binding | |
|---|---|---|
| BACnet IP (Annex J) | Yes | Static Device Address Binding: No |
Network Security Options
| Supported | |
|---|---|
| Non-secure device | Yes |
Character Set
| Supported | |
|---|---|
| ANSI X3.4 | Yes |
BACnet Connection
Use a top or rear punch-out to bring the CAT-5E or CAT-6 cable into the wiring compartment. Connect the Heatronic 4000 to the BACnet network switch using the RJ45 port on the top edge of the control panel.
- Cable length must not exceed 150 feet (47.5 m) for CAT-5E or 300 feet (91.4 m) for CAT-6.
- If the cable was hand-made, verify the continuity of all cables.
A diagram shows the Heatronic 4000 unit with an RJ45 port connecting to a BACnet network switch.
Setting BACnet in the Heatronic 4000 BAS Menu
| Item Field | Range | Description |
|---|---|---|
| MONITOR | OFF or ON Default: OFF Access: ADV |
BAS MONITOR: Choose whether the BAS monitor is available. Requirements: This item is available only when the APP MODE is set to RSET, SETP, DDHW, or EMS. |
| TYPE | BACn, MODB Default: BACn Access: ADV |
BAS TYPE: Select the communication protocol used with the BAS network. Modbus communicates over RS485 and BACnet is over IP. |
| DEVICE ID | 0 to 4, 0 to 99, 0 to 99, 0 to 99 Default: 0, 0, 0, 0 Access: ADV |
BACNET DEVICE ID: Set the unique address in the BACnet network. The address is set using four sets of numbers displayed in the output fields. Press the 'Next Item' button to view and adjust each number set. Requirements: This item is available only when BAS TYPE is set to BACn. |
| PORT | 0x1 to 0xFFFF Default: 0xBAC0 (47808) Access: ADV |
PORT BACNET: Set the User Datagram (UDP) Port on the BACnet network. Requirements: This item is available only when BAS TYPE is set to BACn. |
| DHCP | OFF or ON Default: ON Access: ADV |
BACNET DHCP: Choose whether Dynamic Host Configuration Protocol (DHCP) should be used to automatically assign the IP address on the BACnet network. If ON is selected, the address is displayed in the output fields. Requirements: This item is available only when BAS TYPE is set to BACn. |
| IP ADDR | 0 to 255, 0 to 255, 0 to 255, 1 to 254 Default: 192, 168, 0, 200 Access: ADV |
BACNET IP ADDRESS: Set the IP address on the BACnet network. The address is set using four sets of numbers displayed in the output fields. Press the 'Next Item' button to view and adjust each number set. Requirements: This item is available only when BAS TYPE is set to BACn and BACn DHCP is set to OFF. |
| GATEWAY | 0 to 255, 0 to 255, 0 to 255, 1 to 254 Default: 192, 168, 0, 1 Access: ADV |
GATEWAY BACNET: Set the Gateway address on the BACnet network. The address is set using four sets of numbers displayed in the output fields. Press the 'Next Item' button to view and adjust each number set. Requirements: This item is available only when BAS TYPE is set to BACn and BACn DHCP is set to OFF. |
| SUBNET | 0 to 255, 0 to 255, 0 to 255, 0 to 255 Default: 255, 255, 255, 0 Access: ADV |
SUBNET BACNET: Set the subnet address on the BACnet network. The address is set using four sets of numbers displayed in the output fields. Press the 'Next Item' button to view and adjust each number set. Requirements: This item is available only when BAS TYPE is set to BACn and BACn DHCP is set to OFF. |
| BBMD TIME | OFF, 30 to 65535 Default: OFF Access: ADV |
BACNET BBMD TIME: Set the BACnet Broadcast Management Device (BBMD) time-to-live used for foreign device registration. Requirements: This item is available only when BAS TYPE is set to BACn. |
| BBMD IP | 0 to 255, 0 to 255, 0 to 255, 0 to 255 Default: 127, 127, 127, 127 Access: Adv |
BACNET BBMD IP: Set the BBMD IP address on the BACnet network. The address is set using four sets of numbers displayed in the output fields. Press the 'Next Item' button to view and adjust each number set. Requirements: This item is available only when BAS TYPE is set to BACn and BBMD TIME is not set to OFF. |
| BBMD PORT | 0x1 to 0xFFFF Default: 0xBAC0 (47808) Access: Adv |
PORT BACNET BBMD: Set the BBMD UDP port on the BACnet network. Requirements: This item is available only when BAS TYPE is set to BACn and BBMD TIME is not set to OFF. |
BACnet Analog Parameters
Analog Input Object = AI | Analog Value Object = AV | Read = R | Read/Write = R/W
(n) represents the specific boiler number, including 1, 2, 3, and 4.
| Object ID | Name | Description | Data Type | Read / Write | Units | Range / Value |
|---|---|---|---|---|---|---|
| 0 | PRIM TARG | Primary target temperature | AI | R | °F (64) | -22 to 266°F |
| 1 | PRIM MIN | Minimum primary temperature | AI | R | °F (64) | 60 to 180°F |
| 2 | PRIM MAX | Maximum primary temperature | AI | R | °F (64) | 90 to 225°F |
| 3 | PRIM SUP | Primary temperature supplement | AI | R | °F (64) | -22 to 266°F |
| 4 | PRIM RET | Primary return temperature | AI | R | °F (64) | -22 to 266°F |
| 5 | OUTDOOR (Outdoor) | Outdoor air temperature | AI | R | °F (64) | -76 to 149°F |
| 6 | DHW | DHW tank temperature | AI | R | °F (64) | -22 to 266°F |
| 7 | FLUE (Flue) | Common flue temperature | AI | R | °F (64) | -22 to 266°F |
| 8 | Boil INLET (Boiler Inlet) | Boiler inlet temperature | AI | R | °F (64) | -40 to 500°F |
| 9 | FLOW RATE (Flow Rate) | Flow rate | AI | R | GPM (89) | 0 to 65535 gpm |
| 10 | ENERGY (Energy) | Energy usage | AI | R | Thermes (21) | 0 to 65535 Thermes |
| 11 | PRESSURE (Pressure) | System pressure | AI | R | PSI (56) | 0 to 65535 psi |
| 12 | PRIM P1 RT | Primary 1 pump run time | AI | R | Heures (71) | 0 to 65535 hours |
| 13 | PRIM P2 RT | Primary 2 pump run time | AI | R | Heures (71) | 0 to 65535 hours |
| 14 | DHW P RT | DHW pump run time | AI | R | Heures (71) | 0 to 65535 hours |
| 15 | ERROR (Error) | Current error | AI | R | N/A (95) | See error list |
| 16, 22, 28, 34 | Boil (n) TYPE (Boiler (n) Type) | Boiler (n) type | AI | R | N/A (95) | 0 = MOD, 1 = 1STG 2 = 2STG, 3 = EMS |
| 17, 23, 29, 35 | Boil (n) OUT (Boiler (n) OUT) | Boiler (n) outlet temperature | AI | R | °F (64) | -22 to 266°F |
| 18, 24, 30, 36 | Boil (n) MOD (Boiler (n) MOD) | Boiler (n) outlet modulation | AI | R | % (98) | 0 to 100% |
| 19, 25, 31, 37 | BURNER (n) (Burner (n)) | Boiler (n) run time | AI | R | Heures (71) | 0 to 65535 hours |
| 20, 26, 32, 38 | CYCLES (n) (Cycles (n)) | Boiler (n) cycles | AI | R | N/A (95) | 0 to 65535 |
| 21, 27, 33, 39 | PUMP (n) RT (Pump (n) RT) | Boiler (n) pump run time | AI | R | Heures (71) | 0 to 65535 hours |
Analog Value Objects
| Object ID | Name | Description | Data Type | Read / Write | Units | Range / Value |
|---|---|---|---|---|---|---|
| 0 | SETPOINT (Set Point) | BAS setpoint temperature | AV | R/W | °F (64) | 60 to 225°F |
| 1 | ROOM Occ | Occupied space temperature | AV | R/W | °F (64) | 35 to 100°F |
| 2 | ROOM UnOcc | Unoccupied space temperature | AV | R/W | °F (64) | 35 to 100°F |
| 3 | OUT DSGN (Designated Outdoor) | Designated outdoor temperature | AV | R/W | °F (64) | -60 to 45°F |
| 4 | TERMINAL | Terminal unit type | AV | R/W | N/A (95) | 0 = HRF1, 1 = HRF2, 2 = CONV, 3 = COIL, 4 = RAD, 5 = BASE |
| 5 | OUTDOOR (Outdoor) | Outdoor air temperature | AV | R/W | °F (64) | -85 to 149°F (-85°F = invalid temperature / no BAS sensor) |
BACnet Binary Parameters
Binary Input Object = BI | Binary Output Object = BO | Binary Value Object = BV | Read = R | Write = W
(n) represents the specific boiler number, including 1, 2, 3, and 4.
| Object ID | Name | Description | Data Type | Read / Write | Units | Range / Value |
|---|---|---|---|---|---|---|
| Binary Input Objects | ||||||
| 0 | PRIM P1 | Primary pump 1 status | BI | R | N/A | 0 = Off, 1 = On |
| 1 | PRIM P2 | Primary pump 2 status | BI | R | N/A | 0 = Off, 1 = On |
| 2 | DHW PUMP (DHW pump) | DHW pump status | BI | R | N/A | 0 = Off, 1 = On |
| 3 | SETBACK (Revers) | Revers status | BI | R | N/A | 0 = Off, 1 = On |
| 4 | AUX RLY | Auxiliary relay status | BI | R | N/A | 0 = Off, 1 = On |
| 5 | ALERT RLY (Alert relay) | Dry relay alert status | BI | R | N/A | 0 = Off, 1 = On |
| 6 | HEAT CALL (Heat call) | Central heat call status | BI | R | N/A | 0 = Off, 1 = On |
| 7 | DHW CALL (DHW call) | DHW call status | BI | R | N/A | 0 = Off, 1 = On |
| 8 | FUEL SWITCH (Fuel switch) | Fuel switch status | BI | R | N/A | 0 = Off, 1 = On |
| 9 | FLOW PROOF (Flow validation) | Primary pump flow validation status | BI | R | N/A | 0 = Off, 1 = On |
| 10 | CA PROOF (CA Validation) | Air (CA) combustion validation status | BI | R | N/A | 0 = Off, 1 = On |
| 11, 13, 15, 17 | CONDENSE (n) (Condenser (n)) | Boiler (n) condensation | BI | R | N/A | 0 = No, 1 = Yes |
| 12, 14, 16, 18 | B(n) PUMP (B(n) Pump) | Boiler (n) pump status | BI | R | N/A | 0 = Off, 1 = On |
| Binary Output Objects | ||||||
| 0 | DHW PUMP (DHW pump) | DHW tank pump demand | BO | R/W | N/A | 0 = Off, 1 = On |
| Binary Value Objects | ||||||
| 0 | BAS HEAT CALL (BAS Heat Call) | BAS heat call | BV | R/W | N/A | 0 = Off, 1 = On |
| 1 | BAS PRIM PMP REQ | BAS primary pump demand | BV | R/W | N/A | 0 = Off, 1 = On |
| 2, 3, 4, 5 | ENABLE B(n) (Enable B(n)) | Boiler (n), Active/ Inactive | BV | R/W | N/A | 0 = Active, 1 = Inactive |
Refer to the Heatronic 4000 installation and operation manual for more information.
Troubleshooting
If there is no communication, check the following items:
- Check the Ethernet cable. Cable length must not exceed 150 feet (47.5 m) for CAT-5E or 300 feet (91.4 m) for CAT-6.
- If the cable was hand-made, verify the continuity of all cables.
If communication is intermittent, check the following items:
- Check the Ethernet cable. Cable length must not exceed 150 feet (47.5 m) for CAT-5E or 300 feet (91.4 m) for CAT-6.
Modbus Specification
| Communication Protocol | Modbus over RS485 |
| Physical Layer | RS485 two-wire with ground signal |
| Baud Rate | 2400, 9600, 19200, 57600, 115000 (default: 19200 bps) |
| Recommended Cable | 18 AWG twisted and shielded pair (STP) |
| Transmission Mode | RTU or ASCII (default: RTU) |
| Maximum Cable Length | 115000 bps: 580 feet (177 m) 57600 bps: 1158 feet (353 m) 19200, 9600, 2400 bps: 3280 feet (1000 m) 3280 feet (1000 m) for all baud rates if 120 Ohm termination resistors are used. |
| Start Bit | 1 bit |
| Data Length | 8 bits for RTU mode 7 bits for ASCII mode |
| Parity | None (8 data bits, 2 stop bits) Parity (1 data bit, 1 stop bit) Odd (1 data bit, 1 stop bit) (default: Parity) |
| Addressing | 1 to 247 (default: 1) |
Modbus Connection
Use a top or rear punch-out to bring the twisted pair cable from the nearest Modbus RS485 connection point into the cable space. Install the conductors B (+), A (-), and G from the Modbus point to the 4000 B (+), A (-), and 'Gnd' terminals. 'GND' (ground) should not be connected to the ground screws in the 4000.
The diagram shows the Modbus RS485 wiring for the Heatronic 4000, connecting terminals B (+), A (-), and Gnd.
Setting Modbus in the Heatronic 4000 BAS Menu
| Item Field | Range | Description |
|---|---|---|
| MONITOR | OFF or ON Default: OFF Access: ADV |
BAS MONITOR: Choose whether the BAS monitor is available. Requirements: This item is available only when the APP MODE is set to RSET, SETP, DDHW, or EMS. |
| TYPE | BACn, MODB Default: BACn Access: ADV |
BAS TYPE: Select the communication protocol used with the BAS network. Modbus communicates over RS485 and BACnet is over IP. |
| ADDRESS | 1 to 247 Default: 1 Access: ADV |
MODBUS ADDRESS: Set the unique address in the Modbus network. Requirements: This item is available only when BAS TYPE is set to MODB. |
| DATA | RTU or ASCII Default: RTU Access: ADV |
MODBUS DATA: Choose whether the Modbus communication type should be RTU or ASCII. Requirements: This item is available only when BAS TYPE is set to MODB. |
| BAUD RATE | 2400, 9600, 19K2, 57K6, 115K Default: 19K2 Access: ADV |
MODBUS BAUD RATE: Select the communication speed. To ensure efficient communication, the control's baud rate must be the same as the Modbus network's. Requirements: This item is available only when BAS TYPE is set to MODB. |
| PARITY | NONE, EVEN, ODD Default: EVEN Access: ADV |
MODBUS PARITY: Select the parity used for Modbus communication. Requirements: This item is available only when BAS TYPE is set to MODB. |
Modbus Parameters
Read = R | Read/Write = R/W
(n) represents the specific boiler number, including 1, 2, 3, and 4.
| Registers | Parameter Name | Read/Write | Units | Type | Format | Range |
|---|---|---|---|---|---|---|
| System Status Registers | ||||||
| 1 | Primary target temperature | R | °F | Entry | S16 | -22 to 266°F |
| 2 | Minimum primary | R | °F | Entry | S16 | 60 to 180°F |
| 3 | Maximum primary | R | °F | Entry | S16 | 90 to 225°F |
| 4 | Primary temperature supply | R | °F | Entry | S16 | -22 to 266°F |
| 5 | Primary return temperature | R | °F | Entry | S16 | -22 to 266°F |
| 6 | Outdoor air temperature | R | °F | Entry | S16 | -76 to 149°F |
| 7 | DHW Temperature | R | °F | Entry | S16 | -22 to 266°F |
| 8 | Common flue temperature | R | °F | Entry | S16 | -40 to 500°F |
| 9 | Boiler inlet temperature | R | °F | Entry | S16 | -22 to 266°F |
| 10 | Flow | R | 10*GPM | Entry | U16 | 0 to 65535 gpm |
| 11 | Energy | R | Thermes | Entry | U16 | 0 to 65535 Thermes |
| 12 | System pressure | R | 10*PSI | Entry | U16 | 0 to 65535 psi |
| 13 | Primary pump 1 relay status | R | Enum | Entry | U16 | 0 = Off, 1 = On |
| 14 | Primary pump 2 relay status | R | Enum | Entry | U16 | 0 = Off, 1 = On |
| 15 | DHW pump relay status | R | Enum | Entry | U16 | 0 = Off, 1 = On |
| 16 | Primary pump 1 run time | R | Heures | Entry | U16 | 0 to 65535 hours |
| 17 | Primary pump 2 run time | R | Heures | Entry | U16 | 0 to 65535 hours |
| 18 | DHW tank run time | R | Heures | Entry | U16 | 0 to 65535 hours |
| 19 | Revers status | R | Enum | Entry | U16 | 0 = Occ, 1 = Inocc |
| 20 | Auxiliary relay status | R | Enum | Entry | U16 | 0 = Off, 1 = On |
| 21 | Relay alert status | R | Enum | Entry | U16 | 0 = Off, 1 = On |
| 22 | Central heat call status (CH) | R | Enum | Entry | U16 | 0 = Off, 1 = On |
| 23 | DHW call tank status | R | Enum | Entry | U16 | 0 = Off, 1 = On |
| 24 | Fuel switch status | R | Enum | Entry | U16 | 0 = Off, 1 = On |
| 25 | Primary pump flow validation status | R | Enum | Entry | U16 | 0 = Off, 1 = On |
| 26 | Air (Air Comb) combustion validation status | R | Enum | Entry | U16 | 0 = Off, 1 = On |
| 27 | Error codes | R | Enum | Entry | U16 | See error list |
| System Parameter Registers | ||||||
| 1 | BAS heat call demand | R/W | Enum | Hold | U16 | 0 = Off, 1 = On |
| 2 | BAS target setpoint demand | R/W | °F | Hold | U16 | 60 to 225°F |
| 3 | Primary pump demand | R/W | Enum | Hold | U16 | 0 = Off, 1 = On |
| 4 | DHW tank pump demand | R/W | Enum | Hold | U16 | 0 = Off, 1 = On |
| 5 | Occupied space | R/W | °F | Hold | S16 | 35 to 100°F |
| 6 | Unoccupied space | R/W | °F | Hold | S16 | 35 to 100°F |
| 7 | Designated outdoor temperature | R/W | °F | Hold | S16 | -60 to 45°F |
| 8 | Terminal unit type | R/W | Enum | Hold | U16 | 0 = HRF1, 1 = HRF2, 2 = CONV, 3 = COIL, 4 = RAD, 5 = BASE |
| 9 | Outdoor temperature | R/W | °F | Hold | S16 | -85 to 149°F (-85°F = invalid temperature / no BAS sensor) |
Modbus Parameters
Read = R | Read/Write = R/W
(n) represents the specific boiler number, including 1, 2, 3, and 4.
| Registers | Parameter Name | Read/Write | Units | Type | Format | Range |
|---|---|---|---|---|---|---|
| Boiler Status Records | ||||||
| 10,11,12,13 | Boiler (n), Active/Inactive | R/W | Enum | Hold | U16 | 0 = Active, 1 = Inactive |
| 28,36,44,52 | Boiler (n) type | R | Enum | Entry | U16 | 0 = MOD, 1 = 1STG 2 = 2STG, 3 = EMS |
| 29,37,45,53 | Boiler (n) condensation | R | Enum | Entry | U16 | 0 = No, 1 = Yes |
| 30,38,46,54 | Boiler (n) outlet temperature | R | °F | Entry | S16 | -22 to 266°F |
| 31,39,47,55 | Boiler (n) modulation rate | R | % | Entry | U16 | 0 to 100% |
| 32,40,48,56 | Boiler (n) run time | R | Heures | Entry | U16 | 0 to 65535 hours |
| 33,41,49,57 | Boiler (n) cycles | R | Num | Entry | U16 | 0 to 65535 |
| 34,42,50,58 | Boiler (n) pump status | R | Enum | Entry | U16 | 0 = Off, 1 = On |
| 35,43,51,59 | Boiler (n) pump run time | R | Heures | Entry | U16 | 0 to 65535 |
| Product Information | ||||||
| 60 | Product Model | R | Num | Entry | U16 | 4000 |
| 61 | Firmware Revision | R | Num | Entry | U16 | Revision SVN |
| 62 | Application Version | R | Num | Entry | U16 | J letter of number (A=1, B=2, ...) |
Modbus Troubleshooting
If there is no communication, check the following items:
- Verify that the parity on Modbus terminals A and B is correct.
- Verify that the Modbus 'GND' (ground) terminal is securely connected.
- Verify that the baud rate is the same on both devices.
If communication is intermittent, check the following items:
- Verify that the communication cable is of the twisted type.
- Reliable communication depends on the cable length and baud rate used. A long cable length may require a lower baud rate.
Error Codes
| Code | Description | Code | Description |
|---|---|---|---|
| 0 | No error | 15 | Boiler sensor input |
| 1 | EEPROM error | 16 | Primary pump flow validation error |
| 2 | Primary sensor power error | 17 | Air combustion validation error |
| 3 | Primary sensor return error | 18 | Common flue temperature maximum warning |
| 4 | DHW sensor error | 19 | Heat absence warning |
| 5 | Outdoor sensor error | 20 | tN4 master copy |
| 6 | Common flue sensor error | 21 | tN4 master schedule |
| 7 | Boiler 1 outlet sensor error | 22 | tN4 member schedule |
| 8 | Boiler 2 outlet sensor error | 23 | Device lost (Bus b) tN4 |
| 9 | Boiler 3 outlet sensor error | 24 | Device lost (Bus 1) tN4 |
| 10 | Boiler 4 outlet sensor error | 25 | Device lost (Bus 2) tN4 |
| 11 | Boiler 1 outlet temperature maximum warning | 26 | Device lost (Bus 3) tN4 |
| 12 | Boiler 2 outlet temperature maximum warning | 27 | Device error (Bus b) tN4 |
| 13 | Boiler 3 outlet temperature maximum warning | 28 | Device error (Bus 1) tN4 |
| 14 | Boiler 4 outlet temperature maximum warning | 29 | Device error (Bus 2) tN4 |
| 30 | Device error (Bus 3) tN4 |
