Bosch Worcester 14/19CBI Installation And Servicing Instructions page 25

Fan - Horizontal Flue. Remove the combustion
chamber cover. Carefully pull off the electrical connections and
the tubes from the air flow detector. Loosen the two clamps to
remove the fan . Refer to Fig 34.
Flue Hood - Horizontal Flue. Remove the fan, see
above. Remove the combustion chamber cover and withdraw
the hood. When refitting ensure that the combustion front fits
under the lip of the flue hood.
Burner Blade Assembly. Remove the combustion chamber
cover. Undo the screw at the right hand end of the burner.
Carefully pull-off the connections to the spark electrode. Slide the
burner blade assembly off the injector and remove. Carefully pull
off the flame sense electrode lead. Refer to Fig 33/33a.
Control Board Cover. To gain access to the control board remove
cover from the front clip, with a screwdriver (if necessary) and
unclip from the rear of the controls tray.
Fig. 33a. Inner Casing and control
9/14CBi
17
16
15
14
13
25
12
11
24
23
1. Inner case
2. J bolts and wing nuts (2)
3. Combustion chamber cover
4. Burner
5. Burner fixing screw
6. Control knob
7. Indicator lights
18
10
8. Base/controls fixing screw
9. Cabinet fixing screw
10. Gas valve
11. Spark electrode
12. Burner injector
13. Temperature sensor
14. Overheat thermostat
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 are clear. Do not use 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 from top and bottom after covering the
burner injector. To clean the heat exchanger flueways remove the
stainless steel baffles from the appliance - the rear combustion
chamber cover can be tilted for better access. The front and rear
flueways can be cleaned with a brush being careful to protect the
rear combution chamber insulation. The inner flueway can be
cleaned with a scraper.
Check the combustion chamber insulation and replace if there is
any sign of damage or deterioration. Refer to Section 15.4.11.
Carefully refit any components removed and check that all
screws are tight and the connections properly re-made with the
appropriate gaskets/O-rings/seals.
Re-commission, as necessary, for correct operation to the users
requirements. Refer to Section 12 Commissioning.
19
8
9
15. Air pressure switch
16. Flow pipe
17. Return pipe
18. Combustion test point
19. Sensing tubes
20. Fan
21. Flue hood
25
22
20
1
21
27
26
2
3
4
5
6
7
22. Inner case cover fixing points (4)
23. Outer case earth tag
24. Side cover plate
25. Wire clip
26. 9/14CBi clamping bracket
27. Pressure tube junction