Bosch SSB1000 SA Manual
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Bosch SSB1000 SA Manual

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BUDERUS SSB BOILER
CONTROL SYSTEM MANUAL
SSB800 SA | SSB1000 SA | SSB1000 TL
Installation and Service Instructions for Contractors
WARNING:
Improper installation, set-up, modification, operation or maintenance of
the heating system can cause personal injury and property damage.
Follow these instructions precisely.
If you require assistance or further information, contact a trained and
certified installer.
WARNING:
The operating instructions are part of the technical documents that
must be handed over to the owner or operator of the heating system.
Explain to the owner or operator how to use the heating system using
the operating instructions. Make sure that they are familiar with all
required information for the safe and proper operation of the heating
system.
These instructions are available in English and French.
Please keep these instructions for future reference.

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Summary of Contents for Bosch SSB1000 SA

  • Page 1 These instructions are available in English and French. Please keep these instructions for future reference. BUDERUS SSB BOILER CONTROL SYSTEM MANUAL SSB800 SA | SSB1000 SA | SSB1000 TL Installation and Service Instructions for Contractors...

  • Page 2: Table Of Contents

    Contents Safety and system function ..... . .34 . . . . . . . . . . . . . . Key to symbols and safety instructions 5.3.1 Flame detection (Rev 3.0.0.0) .
  • Page 3 8.1.1 Service Reminder.......45 8.1.2 Service Overdue logging ......45 8.1.3 Service Reminder implementations .

  • Page 4: Key To Symbols And Safety Instructions

    ► Immediately correct all faults to prevent system damage. connects gas and vent, places the boiler in operation, connects the ► Only use original Bosch spare parts. Losses caused by the use of electrical power, and maintains and repairs the boiler.
  • Page 5 Failure to do so shall void the product warranty. ► The boiler is intended only for the use for which it was specifically designed and built. Bosch is hereby excluded from any liability for damages caused to persons, animals or property resulting from installation errors, improper adjustment, maintenance or use.

  • Page 6: Stand-Alone Boiler (Burners Cascade) - System Architecture

    6 | STAND-ALONE BOILER (Burners Cascade) - SYSTEM ARCHITECTURE STAND-ALONE BOILER (Burners Cascade) - SYSTEM ARCHITECTURE 2 .1 General The 900 series burner controls are designed to function as a standalone control unit for intermittent operation on heating appliances with a premix (modulating) burner and a pneumatic air-gas system.

  • Page 7: Setpoints On Touch Screen

    STAND-ALONE BOILER (Burners Cascade) - SYSTEM ARCHITECTURE | 7 2 . 2 . 2 Setpoints on touch screen The following table describes the setpoints that are shown on ver 2.d or higher: Cascade screen – System setpoint Boiler screen – Boiler Setpoint Cascade Module screen –...

  • Page 8: Dipswitch Setting For 2 Burners Cascade

    8 | STAND-ALONE BOILER (Burners Cascade) - SYSTEM ARCHITECTURE 2 .4 Dipswitch setting for 2 Burners Cascade Power switch S1 should only be activated on the managing boiler. Activating more than one switch on the cascade bus may damage the controller! For a single burner the address is: Stand-Alone: All dip-switches OFF.

  • Page 9: Burners Cascade | 9

    BURNERS cascade | 9 3 .2 .1 E2prom address selection through e2prom setting BURNERS cascade When the Dip-switch configuration is set to disabled the burner address is selected with an e2prom parameter. This setting can be changed using a 3 .1 Burner cascade communication setup computer with LabVision PC software.

  • Page 10: Communication With Labvision Pc Software

    10 | BURNERS cascade 3 .2 .3 Communication with LabVision PC software Cascade CH setpoint adaption There are two options for communication with the LabVision PC software. When the system temperature is not high enough the setpoint for all The 850US Device (Argus-to-USB) can either be parallel connected to burners will be adjusted.
  • Page 11 BURNERS cascade | 11 The following diagram shows how the setpoint to the dependents is determined: T_Supply sensor T_System Burner Power Calculated boiler setpoint Cascade setpoint Dependent 1 boiler System Loop PID loop Offset Setpoint Calculation T_Supply sensor Burner Power Calculated boiler setpoint Dependent 2 boiler PID loop...

  • Page 12: Cascade - Domestic Hot Water

    12 | BURNERS cascade 3 .3 .1 Cascade – domestic hot water 3 .3 .3 Limitation of the MAX power for DHW (Rev . 4 .0 .905 .16570) Settings When demand change from CH to DHW all burners in the boiler stop and start DHW demand with a limit amount of burner.

  • Page 13: Cascade - Start/Stop Sequence (Rev. 3.0.0.12315)

    BURNERS cascade | 13 3 .3 .4 Cascade – start/stop sequence (Rev. 3.0.0.12315) The managing burner sends the calculated Cascade_Setpoint to the dependent burners. The power of the burners is PID controlled based on the Calculated_Setpoint and T_Supply . Depending on the temperature difference between T_Header and Header_Setpoint (CH or DHW) the dependent burners will start or stop using different algorithms.
  • Page 14 14 | BURNERS cascade • Starting Burners: If the T_System is Hyst_Down_Start degrees below the Cascade_Setpoint the burners are started at intervals of Start_ Interval, for example 3 min. • Stopping Burners: If the T_System is Hyst_Up _Sto p degrees above the Cascade_Setpoint , the burners are stopped at intervals of Stop_ Interval , for example 3 min.

  • Page 15: Cascade - Power Balance Mode (Rev. 4.0.905.15906)

    BURNERS cascade | 15 Relevant variables (Default) Settable Value Specific Parameters Level °C °F °C °F Delay_ Period_Start_Next_ Burner 2: Installer 1..15 [min] (min) Start Delay Time Delay_ Period_Stop_Last_ Burner 2: Installer 1..15 [min] (min) Stop Delay Time Quick_Delay_ Period_ Start_Next_Burner 2: Installer 5..300...
  • Page 16 16 | BURNERS cascade 3 . 3 . 5 . 2 Power mode 2 – Maximum burners on (Rev . 4 . 0 . 9 05 . 1 5906) Burner shut down Power mode 2 is designed to have as many depending burners on The last started burner will be stopped under the following conditions: as possible.

  • Page 17: Cascade - Burner Rotation (Rev. 4.0.905.X)

    BURNERS cascade | 17 3 .3 .6 Cascade – burner rotation (Rev . 4 .0 .905 .x) 3 .3 .7 Cascade – error handling The burner rotation function can change the start/stop sequence for the 3 . 3 . 7 . 1 Emergency mode cascade burners.

  • Page 18: 18 | Service Display

    18 | Service display 4 .1 .3 Display functions Service display Button Function RESET Reset Lockout error 4 .1 General MENU Enter the main menu 4 .1 .1 Introduction Return to the Status overview The 900PB Display is an advanced graphical user interface for LEFT Return to previous menu item or Status overview applications such as HMI for heating appliances.

  • Page 19: Screens

    Service display | 19 4 .2 Screens 4 .2 .2 Entering the menu Enter the menu by pressing the MENU button once. The header in the 4 .2 .1 Splash screen (Rev 1 .1 .0 .13425) screen shows you are inside the main menu. While scrolling through the menu you will see that the selected menu item is shown in a white rectangle.

  • Page 20: Dair Sequence

    20 | Service display Repeat this action for all numbers to enter the password. Press ESC to go back in the menu and return to the Status Indication screen. During this action, if you want to return to the previous screen, just press MENU or ESC to cancel.
  • Page 21 Service display | 21 [5] Select the desired language (“English“) and press ENTER to confirm: (For setting the display to French: select “Français”, for Italian select “Italiano”) 语言 English Français 中文 Italiano Once you have set the English language, the screen will display its information in English again: General setting Language...

  • Page 22: Menu Structure

    22 | Service display 4 .3 Menu Structure Below is a schematic overview of the menu structure of 900MN control. Main menu Menu item Submenu / Parameter Sub item Value / Unit User level 900MN Central Heating CH Setpoint CH Setpoint 1: User •...
  • Page 23 Service display | 23 Main menu Menu item Submenu / Parameter Sub item Value / Unit User level 900MN (7) CH Hyst Up 2:Installer • °C/°F (*) CH Hyst Down 2:Installer • °C/°F * Checksum software version Main menu Menu item Submenu / Parameter Sub item Value / Unit...
  • Page 24 24 | Service display Main menu Menu item Submenu / Parameter Sub item Value / Unit User level 900MN (52) DHW Instant PID I 3: Factory • (53) DHW Instant PID D 3:Factory • (54) Tap Detect DHW Drop 3:Factory °C/°F (55) Tap Detect Hyst Dn 3:Factory...
  • Page 25 Service display | 25 Main menu Menu item Submenu / Parameter Sub item Value / Unit User level 900MN (*) Prog. Input 1. 2:Installer • (*) Prog. Input 2. 2:Installer • (*) Prog. Input 3. 2:Installer • (*) Prog. Input 5. 2:Installer •...

  • Page 26: Main Control

    26 | Main control Main control The fan speed is continuously monitored. The following conditions for the fan speed are checked. 5 .1 Ignition cycle (Rev 3 .0 .0 .0) • The actual fan speed must be within 300rpm of the The table below shows the states of the burner ignition cycle.
  • Page 27 Main control | 27 Relevant variables (Default) Value Range Specific Parameters Level °C °F °C °F CH_Mode 2: Installer 0, 1, 2, 3, 4 CH_Setpoint [°C/°F] 1: User 20..90 68..194 Sets the required supply temperature. Post_Pump_Period [sec] 1: User 120 sec. 10..900 sec.
  • Page 28 28 | Main control 5 . 2 . 1 . 2 CH mode 1 - CH with an outdoor temperature reset and thermostat control If the parameter CH_Mode is set to 1 the “Outdoor temperature reset with room thermostat” mode is selected. This mode will only function when an outdoor temperature sensor is connected.
  • Page 29 Main control | 29 CH Setpoint calculated with an extra correction The calculated setpoint based on the outdoor temperature can also be adjusted with another correction. The generation of this extra correction is a result of a not linear computation. The new setpoint is calculated as follow: New CH calculated setpoint (@Outdoor_temp)= CH calculated setpoint (@Outdoor_temp) –...
  • Page 30 30 | Main control (Default) Value Settable Specific Parameters Level °C °F °C °F Warm_Weather_Shutdown [°C/°F] 2: Installer 0..35 32..95 Set max. outdoor temp. Above this temperature heat demand is blocked. Boost_Temperature_Incr [°C/°F] 2: Installer 0..20 0..36 CH setpoint increment when heat demand remains beyond Boost_Time_ Delay.

  • Page 31: Demand For Domestic Hot Water (Rev 3.0.0.0)

    Main control | 31 5 . 2 . 1 . 4 CH mode 3 - CH with permanent heat demand Relevant variables For this mode the CH_Mode should be set to 3, no outdoor sensor is (Default) Value Settable needed.
  • Page 32 32 | Main control Relevant variables (Default) Value Settable Specific Parameters Level °C °F °C °F DHW_Mode 2: Installer 0, 1, 2, 3, 5, 6, 7, 8 DHW_Store_Setpoint [°C/°F] 1: User 40..71 104..160 Sets the desired DHW temperature. DHW_Store_Hyst_Down [°C/°F] 3.
  • Page 33 Main control | 33 Relevant variables (Default) Value Settable Specific Parameters Level °C °F °C °F DHW_Mode 2: Installer 0, 1, 2, 3, 5, 6, 7, 8 DHW_Store_Setpoint [°C/°F] 2: User 40..85 104..185 Sets the supply temperature from primary heat exchanger to prepare DHW in the indirect tank.

  • Page 34: Safety And System Function

    34 | Main control 5 .3 Safety and system function When the flame still disappears the minimal fan speed will be increased for the next burn cycle. 5 .3 .1 Flame detection (Rev 3 .0 .0 .0) No. of flame Description When during burning the flame is not detected anymore, the gas valve losses...

  • Page 35: Pump Start Every 24 Hours (Rev 3.0.0.0)

    Main control | 35 The following table shows the sensor availability for all CH and DHW 5 .3 .6 Pump start every 24 hours (Rev 3 .0 .0 .0) control modes. Sensors that are not mentioned in the table are optionally To protect the pump from getting stuck at a certain position it is forced to available for other functions.

  • Page 36: Flue Temperature Protection (Rev 3.0.0.0)

    36 | Main control Frost protection for boiler cascade 5 .3 .9 Input configuration 900MN (Rev 4.0.905.16712) The ‘frost protection’ function for a burner cascade is related to the boiler There are several multiple function inputs that can be applied for different sensor temperatures.

  • Page 37: Heat Exchanger Protection: Max Differential (Rev 3.0.0.0)

    Main control | 37 Relay output Relevant variables For the relay output the following output options are available: (Default) Value Settable Specific Parameters Level Output option °C °F °C °F 0 ¨ Disabled HX Diff DeltaT Min 3: Factory 40 10...80 18...144 1 ¨...

  • Page 38: De-Air Sequence (Rev 3.0.0.0)

    38 | Main control Legionella_Setpoint the control switches ON the pumps, when the 5 .3 .14 De-Air sequence (Rev 3.0.0.0) Anti_Legionella_Sensor temperature is above Anti_Legionella_ The De-Air sequence it is a safety function starting at every power ON Setpoint + 5°C the control stops the pumps. and is used to remove the air from the heat-exchanger.

  • Page 39: Low Water Cut Off (Rev 3.0.0.0)

    Main control | 39 Relevant variables 5 .3 .16 Heat exchanger protection (Rev 3 .0 .0 .0) Heat Exchanger Protection limits the max. heat load based on the heat Specific Parameters Level (Default) Value Range exchanger flow (CH flow). De_Air_Config 2: Installer 0 0..1 0 = DAir disabled;...
  • Page 40 40 | Main control Parameters Behaviour Graphical view Max. available power (%) In this case only the Min_EX_Flow_Rate Min_EX_Flow_Rate has parameter is taken in account. Max.(100%) a value. Nominal_EX_Flow_Rate The Burner switches OFF if the flow is lower than the is 0.

  • Page 41: Boiler Cascade | 41

    Boiler cascade | 41 Boiler cascade 6 .1 Extended 4x2 boiler/burner cascade with Touch Screen and Building Management System (BMS) Demand: 0-10V / OpenTherm / On-Off System sensor D2 is T outside Cascade system sensor Boiler sensor 90xMN - – – Touch Screen 900PB 90xMN D1...

  • Page 42: Compensation For Secondary Manifold Temperature On Single Boiler

    42 | Boiler cascade 6 .2 Compensation for secondary manifold temperature 6 .4 Set the Modules and Boiler Cascade Settings on single boiler 6 .4 .1 Cascade of Modules: Set the address for all the modules To compensate the temperature after the manifold an additional system Boards sensor and the boiler cascade controller must be activated.

  • Page 43: System Test

    System test | 43 7 .1 .1 System test for cascade burners with air-damper System test functionality When a cascade system is configured with an air-damper system test 7 .1 System test (Rev 3 .0 .0 .0) demand cannot be started before the air-damper output is opened and the air-damper input gives a feedback signal.

  • Page 44: Stopping The Test

    44 | System test 7 .3 LWCO Error evaluated at Boiler level 7 .2 .3 Stopping the test Test OK: To activate this modality set via Labvision the following parameter in the Managing boards (Boiler X M1): The test mode is stopped when the high limit sensor of the duplex supply sensor detects the MAX_TEMP_ERROR .

  • Page 45: Service Reminder

    Service reminder | 45 8 .1 .5 Menu’s and Parameters Service reminder Service Reminder status information can be viewed from the Information menu. Here the installer can also reset the service reminder (accessible 8 .1 Service Reminder by any user-level). The Service Reminder functionality is available on all, except the 900PB00 PCB configuration.

  • Page 46: Appendix A - Connection Diagram

    46 | Service reminder Appendix A - Connection diagram A .1 Connection diagram The following connection diagram is specifically assigned to the 905MN Control: Int. ionization 0...10V J9-1 Ignition 0V(GND) J9-3 BURNER J9-2 Open Thermostat interface Spark Return Room Thermostat ON/OFF J9-4 J10-1 J2 1-6...
  • Page 47 Service reminder | 47 A .2 DHW Pump Configuration for 3 way valve output J3 (1-2-7) This configuration replaces CONFIG. 1 in the 905MN connection diagram (paragraph “A.1 Connection diagram” pag. 46) and is specifically for configuring a DHW Pump on the 3 way valve output. With the setting “3 way valve”...

  • Page 48: Appendix B - Maximum Load On Outputs

    48 | Service reminder Output Function J3-3 J3 3 – 8 Programmable output 1* J3-8 * For programmable output options see paragraph “5.3.10 Output configuration 900MN (Rev 4.0.905.16712)” pag. 36. Output Function J3-4 J3 4 – 9 General pump J3-9 Output Function J7 5 –...

  • Page 49: Appendix C - System Parameters

    Service reminder | 49 B .2 Maximum load on outputs (for hardware 905MN1x_3Rf and up) Device Max Current Max Power Control and gas valve 0,5 A 60 VA All pumps together 1,5 A 180 VA 2,0 A 240 VA Total external load 480 VA All other devices must be powered externally.
  • Page 50 50 | Service reminder C .2 Settings stored in 905MN controller Menu item Sub item / Parameter Range Default Value Units User Level Boiler (1) CH Mode 0..5 2: Installer Parameters (3) CH Setpoint 30...90 (86...194) 60 (140) °C (°F) 1: User (109) Calc.
  • Page 51 Service reminder | 51 Menu item Sub item / Parameter Range Default Value Units User Level (50) DHW Hysteresis Up 0...20 (0...36) 4 (7) °C (°F) 3: Factory (51) DHW Instant PID P 0..1255 3: Factory (52) DHW Instant PID I 0..1255 3: Factory (53) DHW Instant PID D...
  • Page 52 52 | Service reminder Menu item Sub item / Parameter Range Default Value Units User Level 0) Disabled 1) General Pump 2) CH Pump 3) DHW Pump 4) System Pump 5) Cascade Pump (125) Prog. Output 1. 6) Alarm Relay 2: Installer 7) Filling Valve 8) LPG Tank...
  • Page 53 Service reminder | 53 Menu item Sub item / Parameter Range Default Value Units User Level On/Off (136) Mod. Pump Mode Modulating On/Off 2: Installer Fixed 20..100% (137) Mod. Pump Min Power 0..100 2: Installer (138) Appliance Type 50..55 2: Installer (139) Dair active Yes, No 2: Installer...

  • Page 54: Appendix D - Control System Technical Specifications

    54 | Service reminder Menu item Sub item / Parameter Range Default Value Units User Level (163) Hyst Up Stop Boiler 0...40 (0...72) 2 (4) °C (°F) 2: Installer (164) Hyst Down Quick Start 0...40 (0...72) 10 (18) °C (°F) 2: Installer (165) Hyst Up Quick Stop 0...40 (0...72)

  • Page 55: Appendix E - Ntc Sensor Curve Selection (Rev 3 .0 .0

    Service reminder | 55 Dimensions (900MN) L× W × H 212×152×47mm (8,35”×5.98”×1,85”) Weight (900MN) 530 gram This consists the total length of the cable, not the length between two boilers. The length differs with the diameter of the cable. Appendix E - NTC sensor curve selection (Rev 3 .0 .0 .0) The NTC curve of each sensor can be changed between LabVision PC software.
  • Page 56 56 | Service reminder Error History The last 15 lockout and 15 blocking errors are stored in the boiler control. This boiler history can be shown via the Boiler History screen in LabVision or via the installer boiler status menu in one of the advanced epHS displays. Time Stamp A time stamp will be added to an error at the moment the error occurs.
  • Page 57 Service reminder | 57 F .2 Lockout codes Error no . Error Description E2PROM_READ_ERROR Internal software error IGNIT_ERROR Three unsuccessful ignition attempts in a row GV_RELAY_ERROR Failure detected in the GV relay SAFETY_RELAY_ERROR Failure detected in safety relay BLOCKING_TOO_LONG Control had a blocking error for more than 20 hours FAN_ERROR_NOT_RUNNING Fan is not running for more than 60 seconds FAN_ERROR_TOO_SLOW...
  • Page 58 58 | Service reminder Error no . Error Description REFHI_TOO_HIGH Internal software error REFHI_TOO_LOW Internal software error REFLO_TOO_HIGH Internal software error REFLO_TOO_LOW Internal software error REFHI2_TOO_HIGH Internal software error REFHI2_TOO_LOW Internal software error REFLO2_TOO_HIGH Internal software error REFLO2_TOO_LOW Internal software error FALSE_FLAME Flame is detected in a state in which no flame is allowed to be seen LOW_WATER_PRESSURE_ERROR...

  • Page 59: Appendix G - Pid: Proportional-Integral-Derivative Controller

    Service reminder | 59 Error no . Error Description Flue is blocked, demand needs to be stopped with fan at ignition speed*, but FLUE_BLOCKED no error needed to be stored at this time Flow is too low, demand needs to be stopped with fan at ignition speed*, but no LOWEXFLOW_PROTECTION error needed to be stored at this time F .4...
  • Page 60 60 | Service reminder The I parameter of the PID-controller is used to adjust the accuracy of the regulation. The I-factor keeps calculating the sum of the error between the input value and the setpoint. This keeps increasing/decreasing the output value. The I-factor is used to eliminate the error between the input value and setpoint that the P-factor cannot regulate.
  • Page 61 Service reminder | 61 output input, u Time, t period Example: offSet = 6400, a = 1,3°C, P = 20sec. Ku = ( 4 * 6400 ) / ( π * 1,3 * 32 ) = 196. PID-D = Ku / 2 = 195 / 2 = ± 100. PID-I = P / 1,2 = 20 / 1,2 * 100 = ±160.

  • Page 62: Appendix H - Cascade Parameter

    62 | Service reminder Appendix H - Cascade parameter (Default) Value Range Specific Parameters Level °C °F °C °F Enable Enable/ Emergency_Mode 1: User Disabled Cascade_Setpoint 1: User 40..93 104..200 [°C/°F] Cascade CH Setpoint Boiler_Address 2: Installer 0...16 0...16 Emergency_Setpoint [°C/°F] 2: Installer 20..90...

  • Page 63: Appendix I - Connector Description For 905Mn1X (120Vac Version)

    Service reminder | 63 Appendix I - Connector description for 905mn1x (120vac version) Connector Pin Description Neutral 4, 8 Earth Line The control is equipped with one fuse rated at 5AT, in the phase. The max. current used by the controller and connected devices must be limited to 4A.
  • Page 64 64 | Service reminder Connector Pin Description External display (AL-BUS Data) External display (24V Power Supply) Return sensor (NTC) DHW sensor (NTC) Flue gas sensor (NTC) System sensor (NTC) Outdoor sensor (NTC) External display (AL-BUS GND) NTC’s have a resistance of 10k@25°C (77°F). Temp.

  • Page 65: Appendix J - Pb Connectors Description

    Service reminder | 65 Connector Pin Description Spark Return SPARK RETURN Connector Pin Description High voltage output (spark plug). Within this connection a 1K series resistor must be present close to the spark plug. IGNITION TRANSFORMER Appendix J - PB Connectors Description J .1 900PB06_3R Connector...
  • Page 66 66 | Service reminder J .2 905PB05_3R Display J .2 .1 Connectors The following connectors are present on the 905PB_3R Display: J18/J27 J2/J26 FRONT BACK Connector Mini Combicon Connector Modular jack MCV 1,5-2-G-3,81 (top entry) 6P/6C J18/J27 are 2-pin and 5-pin connectors that can be used for programming J2/J26 J .2 .2...
  • Page 67 Service reminder | 67 Appendix K - Modbus K .1 Modbus Configuration The table below summarizes the Modbus configuration details. Protocol Modbus RTU. Configurable with 900PB or LabVision. Default dependent address Default: 1 Read Holding registers (03) Supported Modbus commands Write single holding register (06) Write multiple holding registers (10) Baud rate...
  • Page 68 68 | Service reminder K .3 .2 Status Information (100 - 199) Access Holding Automatic Description Range register Conversion Status information 0064 State See state table 0065 Status See status table 0066 Error Code See error list Reserved... Reserved CH pump 0/100 or 0..100% DHW pump 0/100 or 0..100%...
  • Page 69 Service reminder | 69 Access Holding Automatic Description Range register Conversion Reserved… Dependent 04 State See state table Error Code See error list Firing Rate (power output) 0...100% Reserved… Reserved… Dependent 05 State See state table Error Code See error list Firing Rate (power output) 0...100% Reserved…...
  • Page 70 70 | Service reminder Access Holding Automatic Description Remarks Range register Conversion Reserved… Reserved… REMARKS NV Non-Volatile means that the parameter is stored in the non-volatile memory (eeprom, flash, etc). These parameters will retain their value after a reset/power cycle. However the parameters have a limited amount of allowed write cycles (10.000 times, average of 2 times per day), which means these parameters cannot be used for dynamic control! V Volatile, means that the parameter is stored in the volatile memory (RAM).
  • Page 71 Service reminder | 71 K .4 Control register The control register can be used to gain access to special functions (like writing or controller reset). Access Automatic Holding register Description Range Conversion Bit0: Write Enable. 0063 Control register Bit14: Controller reset. When no Modbus communication (reading or writing) is sensed for more than 4,0 Seconds the control register will be reset / cleared.
  • Page 72 72 | Service reminder K .7 Examples: How to update a register with a Write request via Modbus K .7 .1 Example of a simple Write command The following example explains how to update a register with a (simple) write request via Modbus: Address 900PB Command simple write Register to update...

  • Page 73: Appendix L - Safety Timing

    Service reminder | 73 Appendix L - Safety timing Stanby Pre purge 0 Pre purge 1 Pre ignit Ignit Flam Proving Burn Post burn Post purge 0 Post purge 1 State Demand Gas valve Spark Flame Safety period The following table shows the states of the burner ignition cycle: Control state Actions Setting...
  • Page 74 74 | Service reminder The following table shows the states of the pump when demand is cleared: State Actions Setting Pump CH Pump is ON Parameter E2_CH_POST_PUMP_TIME: 30 sec During the ignition cycle multiple safety checks are active: Safety check Actions Setting If flame is detected during the pre-spark period (Pre ignit) a...

  • Page 75: Appendix M - Building Management System (Bms) Registers Specifications

    Service reminder | 75 Appendix M - Building Management System (BMS) Registers Specifications The system is designed to be a cascade of (1..2) burners (modules) which form a stand-alone boiler. This stand-alone boiler has a Modbus and cascade bus interface so that up to 4 boilers can be cascaded. On the BMS side the boilers (1..4) all have their own Modbus dependent address so that the BMS bus can be connected to all boilers.
  • Page 76 76 | Service reminder M .1 Modbus M .1 .1 Configuration The table below summarizes the Slave Modbus configuration details for 900TS. Protocol Modbus RTU. Boiler 1 Default: 1 Boiler 2 Default: 2 Default dependent address Boiler 3 Default: 3 Boiler 4 Default: 4 Read Holding registers (03) Supported Modbus commands...
  • Page 77 Service reminder | 77 M .2 .2 Boiler Cascade Manager Boiler cascade information and settings. BOILER CASCADE STATUS (ONLY AVAILABLE ON THE CASCADE MANAGER) Access HR # Description Range System status info 20000 Power level for entire (boiler) cascade system 0-100% Cascade Ch Mode X setpoint 0-100%...
  • Page 78 78 | Service reminder M .3 Module/Burner Cascade Manager Module/Burner cascade information and settings. M .3 .1 Boiler address Access HR # Control Settings Range Climatic curve status info 31000 Boiler address (1=Cascade / Boiler manager, 2-4=Dependent) 1 - 4 M .3 .2 Module/Burner Cascade Status Access HR #...
  • Page 79 Service reminder | 79 M .3 .3 Boiler Error Log The Error Log items can be read in blocks of 8 holding registers from error log index 0 to 47 (total 48 error log items). NOTE: The error log items are not ordered based on the last occurrence when more than 47 errors are stored! Access HR # Description...
  • Page 80 80 | Service reminder Access HR # Description Range 33019 Overdue counter 14 0…65534 hours. Service Settings 33042 Service Interval. 0…255 x 100 hours NOTE: A Overdue counter value of 0xFFFF means that the counter is not available/empty. M .4 Burner/Module info Each module/burner present in the boiler has its own set of status information holding registers.
  • Page 81 M .4 .2 Burner/Module 2 Status and Control Registers Access HR # Description Range Module/Burner 2-8 status info 40100 Burner/Module 2 (see also holding register contents “M.4.1 Burner/Module 1 Status and Control Registers” pag. 80) 40152 M .5 Data Type Modbus communicates using words (the contents of 16bit holding registers).
  • Page 82 6720892984 (2019/02) US...
  • Page 83 6720892984 (2019/02) US...
  • Page 84 United States and Canada Bosch Thermotechnology Corp. 50 Wentworth Avenue Londonderry, NH 03053 Tel. 603-552-1100 Fax 603-965-7581 www.boschheatingandcooling.com U.S.A. Bosch Thermotechnology Corp. reserves the right to make changes without notice due to continuing engineering and technological advances.

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