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7) If inlet working pressure is ok using the test point on the gas valve marked OUT check the burner pressure. Burner
pressures for the required heat output can be obtained from fig. 42a for natural gas and fig. 42b for LPG.
The burner pressure is adjusted by the pressure regulating screw on the gas valve see section 4.01 for detail.
8) Turn off the boiler and isolate the gas and electricity supplies.
9) Remove the sealed compartment cover (4 screw).
10) Remove the fan assembly and clean with a soft brush.
11) Remove combustion chamber front panel (4 screws) lift out flue hood and baffle plate.
12) Slide the burner forward, disconnect the lead from the spark electrode, remove the burner and clean.
13) Clean injector.
14) Clean the heat exchanger with a suitable soft brush. DO NOT DAMAGE THE REAR INSULATION and clean out the
combustion chamber.
15) EXAMING seals on the room sealed compartment from panel and if necessary replace.
16) Re-assemble in reverse order.
17) Re instate gas and electric supply.
18) Fire the boiler and check all gas joint for soundness.
19) Re check burner pressure.
20) Check flame picture and all controls for correct operation.
21) Check room sealed cover for leakage.
22) Check all safety devices for correct operating.
23) Check the gas rate to the boiler is correct.
24) If a combustion analyzer is to be used, there are 2 test point on the front of the room sealed cover at the top, the
lower one is for the flue gases the upper one for incoming air. The boiler should be operated for at least 10 minutes
before carrying out this test.
CO/CO
ratio should not exceed 0.004 prior to servicing and 0.008 immediately after servicing.
2
25) Refit cover and leave boiler set to customer requirements.
Sigma
23
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