2 | Contents Contents Fitting and removing the front cover ... . . 21 Key to symbols and safety instructions ....3 Fitting the control unit (accessory) .
Key to symbols and safety instructions | 3 Electric shock hazard Key to symbols and safety instructions B Before carrying out any work on the heating system, disconnect the heating system from the power supply across all poles. For example, Explanation of symbols press the emergency stop switch outside the boiler room.
4 | About the boiler Scope of supply About the boiler The boiler is supplied with its full casing. The boiler front cover is supplied separately and has to be fitted. Type overview B On delivery, check that all packaging is in perfect condition. Type Output B Check the delivery for completeness.
About the boiler | 5 Suitable fuels The combustion of biogas is not permitted. Permissible fuels • Natural gas from the public gas supply in accordance with national regulations with a total sulphur content < 50 mg/m • LPG in accordance with national regulations with a content of elementary sulphur <...
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6 | About the boiler 6 720 648 053-13.2T Fig. 1 Boiler overview Boiler body Combustion chamber door Locking lug to secure the load during transportation (not for lifting the boiler) Flue gas collector Condensate drain, siphon Drain Base frame rail Control unit (accessory) Cable conduit [10] Flue gas connection...
If you still cannot meet chimney connection. this criterion, please contact the Bosch sales or service department. • Requirements for the electrical connection to the power supply. • Technical rules of the gas supplier concerning the connection of the...
For boiler room ventilation sizes please refer to BS 6644 and IGE/UP/10. Control unit settings Regarding the size of the combustion air vent, it is essential that the The boiler needs to be operated with a Bosch CFB system installer seeks the agreement of the responsible approval or control unit.
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Information on installation and operation | 11 If the Bosch CFB control unit is used, burner modulation in standard mode is not enabled for 3 minutes. Never modulate upwards more quickly than this. Adjustable parameter (max. temperature) CFB 910 CFB 840 High limit safety cut-out (STB) 110 °C...
Observe the operating conditions in chapter 2.6, require to be matched (equipment and settings). page 4. B Consult the Bosch sales or service department. Observe chapter 5.9, page 23 when installing sensors. Information on boiler cascades: • The third party control unit (building management system or PLC...
Transport | 13 3.11 Pressure maintenance B Size the expansion vessels correctly. B Set the pre-charge pressures correctly. If using pump-controlled pressurisation units, pressure fluctuations will occur. They can occur very frequently depending on the design of the system and the appliance settings. Even if these pressure fluctuations are small, if they occur very frequently they may cause considerable damage to the boiler, as it is designed for a predominantly static pressure load.
14 | Transport B Insert the hooks of the lifting tackle into the eyes in both gusset plates Fig. 6, [2] of the boiler body. B Attach the crane hook to the lifting tackle ( Fig. 6, [1]). Never use the locking lugs [3] for lifting. 90°...
Installation | 15 Installation For the installation and operation of the heating system, observe all country-specific standards and guidelines. The information on the data plate is binding and must be observed. Siting the boiler DANGER: Risk to life through poisoning. Insufficient ventilation can lead to dangerous flue gas leaks.
16 | Installation Fitting sound insulation strips B Level the boiler horizontally using the spirit level in the combustion chamber. DANGER: Injury from crushing. Consider additional sound insulation measures before installing the boiler. To reduce the noise, place the sound insulation strips (supplied with the boiler) below the base frame, flush with the front and back of the boiler.
Installation | 17 • Only flue systems, which are approved for a flue gas temperature of at B Connect the heating system return to the appropriate boiler return least 120 °C, may be used. connection [5], [6]. • Route the flue gas as directly as possible to the chimney considering the best possible flow characteristics (e.g.
18 | Installation B Pivot the combustion chamber door open. The condensate can run into the boiler through the flue pipe. If this is not possible, only use stainless steel or plastic tees in the separate hose inlet. With ceramic flue systems, fit a dirt trap. B Push the siphon provided (condensate drain pipe) onto the pipe connector ( Fig.
Installation | 19 6 720 648 053-37.1T Fig. 15 Installation 6 720 648 053-31.1T Spring Fig. 14 Removing the retaining split pin Washer Hinge pin Rocker arm Retaining split pin Screw B Pull the hinge pin ( Fig. 14, [1]) upwards out of the hinge. B Slightly undo the screws for the door stays on the left hand side until B Unhook the rocker arm ( Fig.
20 | Installation 6 720 648 053-05.1T Fig. 16 Fitting the burner plate 6 720 648 053-06.1T Combustion chamber door Fig. 17 Fitting the gasket Seal Seal Burner plate B Secure the burner to burner plate [2]. Hexagon screws and washers B Cut out insulating rings [4] in accordance with the diameter of blast 5.6.2 Fitting the burner to the burner plate tube [5].
Installation | 21 Fitting and removing the front cover B Hook lower front cover [3] into the retainers on the right hand and left hand side of the boiler casing. B Hook upper right front cover [2] into the retainers on the boiler casing.
22 | Installation 6 720 648 053-09.2T 6 720 648 053-08.1T Fig. 23 Cable conduit at the control unit Fig. 22 Fitting the control unit Sensor well Cable conduit 5.8.3 Making the electrical connection Control unit DANGER: Danger to life through electric shock! B Make the plug-in connection in the control unit in accordance with the B Before opening the boiler, isolate the heating system labelling on the terminal strip.
Installation | 23 6 720 615 362-20.1SL Fig. 25 Securing a cable with a cable clip Fitting temperature sensors NOTICE: System damage through damaged capillaries 6720615883-32.1RS or incorrectly fitted temperature sensor. Fig. 26 Inserting the plastic coil into the sensor well B Ensure that the capillaries are neither kinked nor Compensating spring squashed when uncoiling and routing them.
24 | Commissioning B Fill the heating system slowly and observe the pressure gauge whilst Commissioning doing so. B Vent the heating system via the radiator air vent valves. NOTICE: Risk of boiler damage through contaminated If the water pressure drops as a result of venting the system: combustion air.
Commissioning | 25 Setting control unit parameters The controller settings listed in table 14 apply to the CFB 910 and 930 control units. For further information on setting the control unit, see chapter 3 from page 9. Burner Control unit setting Burner type for fuel Burner type Fuel...
26 | Shutting down Offer your customer an annual contract covering inspection and Shutting down responsive service. For the work covered by such a contract, see chapter 8.5 "Inspection and maintenance reports", page 30. NOTICE: Risk of system damage through frost. Preparing the boiler for inspection and maintenance When there is a frost, the heating system can freeze up if it is not operational, e.g.
Inspection and maintenance | 27 B Remove any cleaning residues with a vacuum cleaner. B Check the seals around the boiler door, reversing chamber and flue gas collector, and replace if required. B Close and secure the combustion chamber door. 6 720 648 053-11.1T Fig.
28 | Inspection and maintenance 8.3.4 Replacing the flue gas collector gasket Liquid cleaning residues can be drained off through the condensate drain pipe on the flue gas collector. Replace the gasket in the flue gas collector cover during B Disconnect the heating system from the power supply. the annual service.
Inspection and maintenance | 29 8.4.1 When should you check the water pressure in the heating 8.4.2 Sealed unvented systems system? NOTICE: System damage through frequent topping up. The fill and top-up water quality must comply with the Subject to the water quality, your heating system can be specifications in the operator's log supplied.
30 | Inspection and maintenance Inspection and maintenance reports Complete these reports after inspections and service. The report can also be used as copying template. The inspection and maintenance reports provide an overview of the required inspection and service steps that should be carried out annually. B Sign and date the completed inspection work.
Correcting a burner fault | 31 Confirm professional inspection with signature, date and company stamp. Table 17 Page Responsive maintenance (individual steps) Notes Shut down the heating system. Page 26 Clean the combustion chamber. Page 26 Clean hot gas flues (heating surfaces). Page 26 Check gaskets/packing cords on the combustion chamber door, inspection apertures in the reversing chamber and flue gas...
32 | Environmental protection/disposal Environmental protection/disposal Environmental protection is a key commitment of the Bosch Group. Quality of products, efficiency and environmental protection are equally important objectives for us. All legislation pertaining to the environment is strictly observed. To protect the environment we use the best possible technology and materials, subject to economic considerations.
Keyword index | 33 Keyword index About the appliance ..............4 Guidelines ................9 Appliance description............. 5 CE Declaration of Conformity........... 4 Correct use ................4 Heating flow ................17 Operating conditions .............. 4 Heating return ................. 17 Overview of possible fuels ............5 Scope of supply ..............
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34 | Keyword index Packaging ................32 Preparing the heating system for operation ........24 Prior to commissioning Converting the combustion chamber door....... 18 Opening the combustion chamber door ........18 Product description ..............5 Recommended wall clearances........... 15 Recycling ................32 Regulations ................