Bosch CFB 840 Servicing Instructions Download Page 7

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Controls and programming unit

6 720 802 836 (2012/05)

CFB 840

Reposition rotary dial.

Fig. 4 Boiler water temperature controller

[1]

End stop tabs

Controls and programming unit

4.1

Control unit controls

Fig. 5 Control unit controls (delivered condition)

[1]

High limit safety cut-out

[2]

Boiler water temperature controller

[3]

Fuse F1

[4]

Connection for external service equipment and programmer

[5]

Burner emergency operation switch

[6]

On/Off switch

Fig. 6 Fitted modules

[1]

Slot 1, e.g. FM442/CMM 920 - heating circuit 1, heating circuit 2

[2]

Slot A: ZM422 - feed for external heat sources, heating circuit 0

[3]

Slot B: Programmer (CM431) - programming unit

[4]

Slot 2, e.g. FM442/CMM 920 - heating circuit 3, heating circuit 4

6 720 803 704-04.1T

6 720 803 704-05.1T

6 720 803 704-06.1T

Summary of Contents for CFB 840

Page 1: ...Servicing instructions for heating contractors Control Unit CFB 840 6 720 803 855 00 1T 6 720 802 836 2012 05 GB IE AU ...

Page 2: ... building 18 8 3 Summer wintertime changeover 18 8 4 Remote adjust 19 8 5 Manual fault message control 19 8 6 Automatic maint message 19 8 7 Module selection 20 9 Boiler parameters 20 9 1 Select boiler type 20 9 1 1 Low temperature boilers 20 9 1 2 Ecostream boilers 21 9 1 3 Condensing boiler 21 9 1 4 Low temperature boilers with base temperature 21 9 2 Setting the burner type 22 9 2 1 Modulating ...

Page 3: ...perature 38 11 9 3 Setting the weekday 39 11 9 4 Setting the time 39 11 10 Setting range Daily heat up 39 11 11 DHW circulation pump 40 11 11 1 Selecting the DHW circulation pump 40 11 11 2 Setting intervals 40 12 Special parameter 41 13 Heating curve 41 14 Relay test 41 15 Carrying out an LCD test 41 16 Fault log 42 17 Monitor data 42 17 1 Boiler monitor data 42 17 2 Heating circuit monitor data ...

Page 4: ...c shock B Ensure that any electrical work is only carried out by an approved electrician B Observe the relevant requirements when working on electrical installations B Ensure that a circuit breaker in accordance with applicable standards is present to disconnect all poles from the mains power supply If there is no circuit breaker you will need to install one B Beforeopeningthecontrolunit isolateal...

Page 5: ...the screw connection B Remove the STB with its assembly plate and make the adjustments Æ chapter 3 1 2 DANGER Risk to life and of system damage through excessively high temperatures All parts directly or indirectly subject to high temperatures must be designed for use at such temperatures B Ensure that wiring and other lines are routed at a safe distance from hot boiler parts B Route wiring and ot...

Page 6: ...er certificate to the maximum permissible heating system temperature The factory setting is 110 C CAUTION System damage due to incorrect installation of the STB at the boiler The sensormust be pushed intothe sensor wellasfar as possibletoensureareliableandfastshutdownincaseof excesstemperature Ensure an optimum heat transfer from STB sensorto boiler The sensors must be secured in the sensor wells ...

Page 7: ...r water temperature controller 3 Fuse F1 4 Connection for external service equipment and programmer 5 Burner emergency operation switch 6 On Off switch Fig 6 Fitted modules 1 Slot 1 e g FM442 CMM 920 heating circuit 1 heating circuit 2 2 Slot A ZM422 feed for external heat sources heating circuit 0 3 Slot B Programmer CM431 programming unit 4 Slot 2 e g FM442 CMM 920 heating circuit 3 heating circ...

Page 8: ... the time 5 Change temperature values 6 Summer wintertime changeover 7 Back to the standard display 8 Select a time switch program 9 Selecting heating circuits DHW circuit 10 Select standard display 11 Enter holidays 12 Enter the day of the week 13 Constant setback mode 14 Automatic heating mode in accordance with a time switch 15 Constant heating mode 16 Rotary dial 17 Display 1 2 3 5 6 7 9 8 4 1...

Page 9: ... store system X Function module FM448 CMB 930 central fault message X Expansion module ZM426 CME 920 additional STB X Function module FM458 CMC 930 strategy module Table 6 Modules and their functions 1 6 720 803 703 05 1T Address Description 0 Stand alone control unit Set the address to 0 if the control unit operates as stand alone equipment factory setting Each device must be given a different ad...

Page 10: ...without any restrictions Fig 11 ZM422 1 General fault e g on site faults sensor faults external faults wiring faults internal module faults manual mode The error messages appear as plain text in the programming unit 2 Boiler circuit 0 in summer mode 3 Heating circuit 0 or boiler pump operational 4 DHW circulation pump operational 5 Cylinder primary pump operational 6 Manual switch heating circuit ...

Page 11: ...ernal faults wiring faults internal module faults manual mode The errormessagesappear as plain text in the programming unit 2 Heating circuit in summer mode 3 Heating circuit pump operational 4 Mixing valve opens hotter 5 Mixing valve closes colder 6 Manual heating circuit switch e g for heating circuit 1 and 2 In normal operation the manual switch is set to AUT Current functions are indicated by ...

Page 12: ...ve B Press the Night mode button The display shows Data are from ctrl unit taken Alternative control unit of the same type If the Programmer is connected to a different control unit of the same type the display will show the below message for approx 3 seconds NB other control unit If the Programmer programming unit is separated from the control unit and data is modified the display shows Aut butto...

Page 13: ...monitor the boiler temperature and interrupt the test if required 6 2 2 Terminating or cancelling the test B Set burner emergency switch Æ fig 13 2 to AUT B Depending on controller type release the lever or button Æ fig 14 page 14 B Push on the button of the temperature controller Æ fig 13 1 B Set controllers switches and thermostats to the equipment specific conditions B Set the temperature contr...

Page 14: ...5 Fig 14 Triggering the high limit safety cut out 1 Key 2 Lever 6 2 3 Resetting the high limit safety cut out Fig 15 Resetting the high limit safety cut out B Undo the cap B Push the reset button underneath B Refit the cap 6 720 803 704 09 1T 1 2 ...

Page 15: ...om outside temperature Thermal disinfection weekday Boiler pump function Thermal disinfection time Boiler pump run on time Daily heat up Minimum burner runtime DHW circulation start frequency per hour Pump logic temperature Special parameters Minimum start temperature Heating characteristics Maximum shutdown temperature Heating curve heating circ 0 Flue gas temperature limit Heating curve heating ...

Page 16: ...ress and hold Display B Turn the rotary dial to the required value The display shows the set value B Release Display to save your input B Press Back to return to the next higher level To return to the standard display B Press Back several times 8 General specification data B Call up the service level GENERAL PARAM appears as the first main menu B Press Display to call up a submenu B Turn the rotar...

Page 17: ...mum outside temperature B Hold down button Display and turn the rotary dial until the required value is shown The display shows the set value B Release Display to save your input B Press Back to return to the next higher level The minimum outside temperature for your region average value is stated in tab 12 If your particular region is not shown in the table set an average value between the two ci...

Page 18: ... display shows the set value Fig 21 Summer winter time changeover B Release Display to save your input B Press Back to return to the next higher level Class Explanation light heat storage capacity e g prefabricated building wood frame construction medium medium heat storage capability e g house built with breeze blocks heavy heat storage capacity e g brick house Table 13 Heat storage capacity Inpu...

Page 19: ...ance after hours run only for control units with direct boiler control B Call up the service level GENERAL PARAM appears as the first main menu B Press Display to call up a submenu B Turn the rotary dial until submenu automatic maint message is displayed B Hold down button Display and turn the rotary dial until the required value is shown The display shows the set value Fig 23 Automatic maint mess...

Page 20: ... button Display and turn the rotary dial until the required value is shown B Release Display to save your input B Press Back to return to the next higher level 9 1 1 Low temperature boilers The low temperature boiler is operated with a factory set pump logic which depends on the selected burner type Setting the pump logic temperature The heating circuit circulation pumps and if installed the boile...

Page 21: ... B Turn the rotary dial until submenu Actuator runtime appears B Hold down button Display and turn the rotary dial until the required value is shown B Release Display to save your input B Press Back to return to the next higher level The runtimes of the heating circuit actuators are entered separately under parameter Heat circuit If the runtimes of the individual heating circuit actuators are diff...

Page 22: ...ovement between closed and open B Turn the rotary dial until submenu Burner sett motor runtime appears B Hold down button Display and turn the rotary dial until the required value is shown B Release Display to save your input B Press Back to return to the next higher level 9 2 2 2 x single stage burner Lead lag acc to Set Hours This options allow the selection of the number of hours after which th...

Page 23: ...submenu Minimum burner runtime appears B Hold down button Display and turn the rotary dial until the required value is shown B Release Display to save your input B Press Back to return to the next higher level 9 3 4 Selecting the minimum start temperature This setting determines the minimum limit for the cut in temperature at which the burner starts The burner will be switched ON again no later th...

Page 24: ...ay to call up a submenu Heating system is shown as first main menu B Hold down button Display and turn the rotary dial until the required value is shown Fig 26 Select the heating system B Release Display to save your input B Press Back to return to the next higher level At setting 75 C the thermostat must be set to 90 C Æ chapter 3 1 2 page 6 Input range Factory setting Maximum shutdown temp 70 C ...

Page 25: ...ry dial until the required value is shown Fig 28 Setting the low end temperature B Release Display to save your input B Press Back to return to the next higher level 10 4 Setting the design temperature The design temperature is the flow temperature at the adjusted minimum outside temperature For the heating system Low end the following applies Set the design temperature at least 10 C higher than t...

Page 26: ...tem it can be determined whether a remote control will be installed for the heating circuit concerned Here you can select the following No remote control Remote control with display Programmer MEC heat circ Remote control without display BFU or BFU F Aremotecontrolunitmustbeinstalledtoenablethefollowingfunctions which monitor the room temperature Night setback with hold room temperature Max room i...

Page 27: ...n Fig 33 Setting the Maximum room influence B Release Display to save your input B Press Back to return to the next higher level 10 9 Select the type of setback The following functions are available for setback mode or night mode Turn the rotary dial to with display if the selected heating circuit has been assigned to the Programmer Input range Factory setting Remote control none without display w...

Page 28: ...til submenu Holiday Setback type appears B Hold down button Display and turn the rotary dial until the required value is shown Fig 36 Setting holiday mode B Release Display to save your input B Press Back to return to the next higher level 10 12 Stopping setback at low outside temperatures EN 12831 enables stopping the setback when the actual temperature falls below a selected adjusted outside tem...

Page 29: ...evel GENERAL PARAM appears as the first main menu B Turn the rotary dial until main menu Heat circuit No is displayed B Press Display to call up a submenu B Turn the rotary dial until submenu Room temperature offset appears B Hold down button Display and turn the rotary dial until the required value is shown Fig 39 Setting the room temperature offset B Release Display to save your input B Press Ba...

Page 30: ...me appears B Hold down button Display and turn the rotary dial until the required value is shown Fig 42 Set switch off optimisation time B Release Display to save your input B Press Back to return to the next higher level Input range Factory setting Autom adaptation yes no no Table 54 Setting range Automatic adaptation The function Optimisation requires a remote control with room temperature senso...

Page 31: ...ary dial until the required value is shown Fig 44 Setting DHW priority B Release Display to save your input B Press Back to return to the next higher level 10 20 Setting the heating circuit actuator The function Actuator determines whether or not the system is equipped with a heating circuit actuator mixing valve The control unit drives the actuator if it is installed in the heating circuit mixing...

Page 32: ...he following two changeover functions can be selected 1 changeover Day night via the terminals WF1 and WF3 Contact WF1 and WF3 closed day mode Contact WF1 and WF3 open night mode 2 changeover day night aut via terminals WF1 WF2 WF3 Contact WF1 and WF3 closed day mode Contact WF1 and WF2 closed night mode all contacts open automatic mode B Call up the service level GENERAL PARAM appears as the firs...

Page 33: ...ryingprogramforthescreedcanbeentered AsheatingsystemUnder floor must be set After a power failure screed drying continues from where it was interrupted Fig 50 Screed drying x Time days y Temperature a 3 days hold time b Temp increase by c max temperature d Setback by B Call up the service level GENERAL PARAM appears as the first main menu B Turn the rotary dial until main menu Heat circuit No is d...

Page 34: ...setting determines the maximum temperature for screed drying B Turn the rotary dial until submenu Screed drying Max temperature appears B Hold down button Display and turn the rotary dial until the required value is shown Fig 54 Setting the maximum temperature B Release Display to save your input Input range Factory setting Screed drying no yes no Table 65 Setting range Screed drying The menu opti...

Page 35: ...evel GENERAL PARAM appears as the first main menu B Turn the rotary dial until main menu DHW Domestic hot water appears B Press Display to call up a submenu DHW appears as the first main menu B Hold down button Display and turn the rotary dial until the required value is shown B Release Display to save your input B Press Back to return to the next higher level 11 2 Setting the temperature range Th...

Page 36: ...o save your input B Press Back to return to the next higher level 11 5 Setting hysteresis The function Hysteresis determines at how many Kelvin K drop below the set DHW temperature the reheating of the cylinder begins B Call up the service level GENERAL PARAM appears as the first main menu B Turn the rotary dial until main menu DHW appears B Press Display to call up a submenu B Turn the rotary dia...

Page 37: ...y to call up a submenu B Turn the rotary dial until submenu External fault message WF1 2 appears B Hold down button Display and turn the rotary dial until the required value is shown Fig 63 External fault message B Release Display to save your input B Press Back to return to the next higher level 11 8 External contact WF1 WF3 If a volt free pushbutton is connected to terminals WF1 and WF3 in modul...

Page 38: ...this fails fault message Therm disinfect failed The thermal disinfection function can also be set via a separate control programme 11 9 1 Setting thermal disinfection B Call up the service level GENERAL PARAM appears as the first main menu B Turn the rotary dial until main menu DHW appears B Press Display to call up a submenu B Turn the rotary dial until submenuTherm disinfect appears B Hold down ...

Page 39: ...Release Display to save your input B Press Back to return to the next higher level 11 10 Setting range Daily heat up When daily heat up is set the DHW which may include a solar cylinder if installed is heated to 60 C once a day to prevent legionella bacteria from developing in the DHW system The time when the cylinder is heated can be adjusted B Call up the service level GENERAL PARAM appears as t...

Page 40: ...when in day mode and is switched off in night mode Example A proprietary time programme was entered that within the period of 05 30 hours 22 00 hours and when setting DHW circulation is enabled turns on the circulation pump 2 times per hour The circulation pump is enabled in cycles at 05 30 h for 3 minutes at 06 00 h for 3 minutes at 06 30 h for 3 minutes etc until 22 00 hours Setting intervals B ...

Page 41: ...lation pump Actuator not on heating circuit 0 Domestic hot water Cylinder primary pump DHW circulation pump Relay test example B Call up the service level GENERAL PARAM appears as the first main menu B Turn the rotary dial until main menu Relay test appears B Press Display to call up a submenu B Turn the rotary dial until submenu Heating circ 2 appears B Press Display to call up a submenu B Turn t...

Page 42: ... displays the target and actual values The display depends on which modules are installed The menus described in these instructions relate exclusively to the control unit with the most commonly used module FM442 CMM 920 Somedisplayvaluesareseparatedbyaslash Thenumberinfrontofthe slash specifies the set value of each corresponding parameter and the figure after the slash is the actual value The dat...

Page 43: ...mperatures are displayed The last line displays one of the following operating modes Constant night Constant day Automatic night Automatic day Holiday Summer Start optimising Stop optimising Screed DHW Priority No setback B Turn the rotary dial to scroll through the heating circuit monitor data B Press Back to return to the next higher level Design temperature adaptation This value displays the de...

Page 44: ...Indicates the operating condition of the cylinder primary pump DHW circulat Indicates the operating condition of the DHW circulation pump Fig 81 DHW monitor data 18 Display version Menu Version displays the Programmer programming unit version as well as that of the selected control unit B Call up the service level GENERAL PARAM appears as the first main menu B Turn the rotary dial until main menu ...

Page 45: ...all ofequal importancetousandall environmental protectionlegislation and regulations are strictly observed We use the best possible technology and materials for protecting the environment taking account of economic considerations Packaging Weparticipateintherecyclingprogrammesofthecountriesinwhichour products are sold to ensure optimum recycling All of our packaging materials are environmentally c...

Page 46: ... Constant drawing or system leak Manual switch not set to AUT Incorrect sensor arrangement Primary pump incorrectly connected or faulty Module or control unit faulty B Check sensor connection and values B Fix any leakages B Check whether the manual switch is to AUT B Check primary pump function e g with a relay test Æ chapter 14 page 41 B Replace sensor or module DHW cold DHW heating was interrupt...

Page 47: ...dress settings Æ chapter 5 1 page 9 Addr conflict x The functions of the module with the address conflict can no longer be carriedout However communicationof all other modules and control units via the ECOCAN BUS is still possible Module is installed in wrong slot B Check wether the module may be used with this type of control unit Æ chapter 3 2 page 6 Incorr module x Module switches all outputs o...

Page 48: ...sing the diagram determine whether temperature and resistance correlate Fig 84 Outside temperature sensor and boiler water flow and DHW temperature sensors 1 Outside temperature sensor curve 2 Sensor curves boiler water flow and DHW temperature DANGER Danger to life from electric shock B Before opening the appliance isolate all poles of the mains power supply and secure against unauthorised re con...

Page 49: ...Appendix 49 6 720 802 836 2012 05 CFB 840 Fig 85 Room temperature and flue gas temperature sensors 1 Room temperature sensor curve 2 Flue gas temperature sensor FG curve 6 720 803 703 108 1T ...

Page 50: ...ondens 5000 F 145 640 kW Uni Condens 6000 F 800 1200 kW Ecostream to be enabled for boiler series Uni 7000 F 105 230 kW1 2 Uni 7000 F 240 510 kW1 Uni 7000 F 570 1200 kW1 LT low end temperature Not available in the UK To be enabled for boiler series Uni 3000 F 120 600 kW3 Uni 3000 F 730 1850 kW3 for raised minimum boiler water temperatures 1 Operating flow temperature control via heating circuit ac...

Page 51: ...age 37 External switch 37 F Fault displays 42 Fault log 42 Flow 29 Flow temperature 26 Flue gas temperature 24 FM442 CMM 920 11 Heating circuit function 12 Frost prot 31 Frost protection temperature 31 Fuel 21 H Heat storage capacity 18 Heat circuit 25 Heating circuit function 12 Heating system 24 Holiday 28 Hysteresis 36 I Inert anode 37 L Load limit 22 Low end temperature 25 Low temperature 50 L...

Page 52: ...Service level 16 Shutdown temperature 24 Single loading 37 Start optimisation 43 Stop optimisation 43 Stop optimisation time 30 Summer wintertime changeover 27 Switching optimisation 30 36 T Terminator 10 Thermal disinfection 38 Clock time 39 Temperature 38 Weekday 39 Type of building 18 Type of burner 22 U Used appliances 45 Z ZM422 10 Burner function 11 DHW function 11 Flue gas test 11 Heating c...

Page 53: ... 53 6 720 802 836 2012 05 CFB 840 Notes ...

Page 54: ...54 CFB 840 6 720 802 836 2012 05 Notes ...

Page 55: ... 55 6 720 802 836 2012 05 CFB 840 Notes ...

Page 56: ...derus de C F Quadrant Ltd Unit L40 Cherry Orchard Industrial Estate Cherry Orchard Dublin 10 Tel 01 6305700 Fax 01 6305706 01 6305715 www cfquadrant ie E mail sales cfquadrant ie Robert Bosch Australia Pty Ltd Thermotechnology Division 1555 Centre Road Clayton Victoria 3168 Australia Phone 1300 30 70 37 Fax 1300 30 70 38 www bosch climate com au New Zealand Phone 0800 4 Bosch or 08 543 352 www bos...

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