Bosch 15SBI Service Manual download pdf (Page 21)

13.1 Hand over the User Booklet and explain how to operate the

appliance safely and efficiently.

13.3 Tell the user what to do if the appliance is not to be used in

very cold conditions.

13.4 Tell the user what to do if the system pressure falls.

13.5 Explain that regular servicing will maintain the safe and

efficient operation and extend the life of the appliance. WHS can

offer a comprehensive maintenance contract.

13.6 Tell the user that any work on the appliance must only be

carried-out by a competent person.

14.1 The extent of the service will be determined by the

operating condition of the appliance. It is the law that any

service work is carried-out by a competent person.

14.2 Inspection

Check that the terminal and the terminal guard, if fitted, are clear

and undamaged.

If the appliance is in a compartment or cupboard check that the

specified clearances are clear. Refer to Table 8.

Check all the joints and connections in the system and remake

any that show signs of leakage. Refill and re-pressurise as

described in Section 12-Commissioning.

Operate the appliance and take note of any irregularities. Refer to

Section 18-Fault Finding.

Check the combustion performance

Remove the cap from the sample point on the top of the

appliance and connect the meter. Refer to Fig 35.

With the appliance at maximum rate and stable expect readings

of about 6.5% - 7.00% CO2 and 0.002% CO.

Refit the sample point cap after the test.

Always test for gas soundness after the service has been

completed.

Disconnect the electrical supply at the mains and turn off the

gas supply at the gas service cock on the appliance before

starting any service procedures.

14.3 Component Access

Remove some or all of the following parts to gain access to

components.

Cabinet Front Panel. Lift off the supports.

Facia. Unscrew the two screws and lower. Refer to Fig 18.

Inner Casing. Unscrew the four screws and remove. Refer to Fig 18.

Combustion Chamber. Unscrew the two screws at the top.

Loosen but do not remove the two wing-nut extended screws at

the sides, unhook the clips and remove the chamber. Refer to Fig 41

and 42.

Fan. Carefully pull off the electrical connections and the tubes

from the air flow detector. Unscrew the three screws to remove

the fan assembly. Refer to Fig 51.

Flue Hood. Remove the fan. Unscrew the two screws at the front

and withdraw the hood. Ensure that the replaced hood passes

under the lip at the rear of the appliance.

Burner. Remove the combustion chamber. Release the union nut

at the top of the gas valve. Carefully pull-off the connections to

the spark electrode and separate the in-line connector to the

flame sensing electrode. Refer to Fig 43 and 44.

14.4 Component Cleaning

Do not use a brush with metal bristles to clean components.

Clean the fan taking care not to block air flow detector.

Clean the burner to ensure that the blades and injector are clear.

Do not us a metal probe to clean the injector.

Clean the electrodes and check the alignment. Replace if there is

any sign of deterioration.

Clean the heat exchanger after covering the gas inlet tube.

Straighten any distorted fins on the heat exchanger.

Check the combustion chamber insulation and replace if there is

any sign of damage or deterioration. Refer to Section 15.4.5.

Carefully refit any components removed and check that all

screws are tight and the connections properly re-made with the

appropriate gaskets/O-rings.

Re-commission, as necessary, for correct operation to the users

requirements. Refer to Section 12 Commissioning.

Important: Turn off the gas and electricity supplies and drain,

where necessary, before replacing any components.

15.1 Always check for gas soundness where relevant and carry-

out functional checks as described in Section 12-Commissioning.

Any O-ring or gasket that appears damaged must be replaced.

15.2 Component Access

Refer to Section 14.3 Inspection and Servicing for access to

components.

15.3 Draining the Appliance

Turn off the heating flow and return valves at the appliance.

Refer to Fig 16.

Remove the casing bottom panel by releasing it from the clips.

Fit a tube to each of the drain connections and open the taps.

Refer to Fig 47. Close the taps when the flow has stopped.

Important: A small quantity of water will remain in some

components. Protect any electrical components when removing

items that might retain water.

15.4 Component Replacement

Refer to Fig 41, 42 and 43 for the location of the components.

Replace any components removed from the appliance in the

reverse order using new gaskets/O-rings/sealant/heat transfer

paste where necessary. Always check that any electrical

connections are correctly made and that all screws are tight.

15. Replacement Of Parts

14. Inspection And Service

13. Instructions To The User

Fig.40 . User controls.

24SBi

System

pressure

gauge

C.H temperature control and

On/Off knob

Mains indicator

Reset button

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 36 37

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Bosch 15SBI Service Manual Page 21

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