Assessments - 3, GPA: 4.3
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Refer to Fig 30/30a. With the appliance at maximum rate and stable expect readings of about: APPLIANCE SHORT FLUE WITH RESTRICTOR PLATE FITTED LONG FLUE WITHOUT RESTRICTOR PLATE FITTED CO CO2 CO CO2 9/14CBi NG 0.003 - 0.007 7.2 - 8.1 0.002 - 0.005 6.0 - 6.8 LPG 0.003 - 0.007 8.1 - 8.7 0.002 - 0.005 6.9 - 7.7 14/19CBi NG 0.002 - 0.005 6.6 - 7.5 0.002 - 0.005 5.6 - 6.5 LPG 0.002 - 0.005 7.8 - 8.5 0.002 - 0.005 6.3 - 7.0 19/24CBi NG 0.008 - 0.012 7.1 - 7.7 0.008 - 0.012 7.0 - 7.8 LPG 0.005 - 0.010 8.0 - 8.9 0.008 - 0.015 7.8 - 8.5 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 Ensure that the gas and electricity supplies are isolated before accessing the following parts. Remove some or all of the following parts to gain access to the components. Outer Case. Loosen the screw and clip at the base, disconnect the earth tag, lift the case up and pull forwards. Base/Control Assembly. Remove the single screw and lower. Refer to Fig. 33a/b. Inner Case Door. Remove the four corner screws and lift the door off. Combustion Chamber Front Cover. Loosen the two wing-nuts and slide the 'J' bolts out of the slots. Pull the front cover forwards and upwards to remove from the boiler. NOTE: On the 9/14CBi the RHS bolt and clamping bracket must be removed. Fan - Rear Only Flue. Remove the combustion chamber front cover. Carefully pull off the electrical connections and the pressure tubes from the air flow detector. Slide out the fan and flue hood assembly. Ensure that the combustion chamber rear fits under the lip on the fluehood. To remove the fan, remove the two fixing screws and release the clamping bracket. 24 Fan Flue Hood - 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. 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 1819 16 15 14 13 25 12 11 24 23 10 9 1. Inner case 8. Base/controls fixing screw 2. J bolts and wing nuts (2) 9. Cabinet fixing screw 3. Combustion chamber cover 10. Gas valve 4. Burner 11. Spark electrode 5. Burner fixing screw 12. Burner injector 6. Control knob 13. Temperature sensor 7. Indicator lights 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. 22 1 21 20 26 27 2 3 4 5 6 15. Air pressure switch 16. Flow pipe 17. Return pipe 18. Combustion test point 19. Sensing tubes 20. Fan 21. Flue hood 78 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 25 15. Replacement Of Parts 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, gasket or seal that appears damaged must be replaced. 15.2 Component Access Refer to Section 14.3 Inspection and Servicing for access to components. Fig....
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