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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
9.6 Gas Orifi ce
1. Refer to 9.1 Preparation Step.
2. Loosen the bottom part of the gas outlet pipe slightly using a wrench.
Figure 92
3. Loosen the 4 fi xing screws.
Figure 93
4. Loose
n the middle orifi ce fi xing screw (Item 1) and replace with a new orifi ce.
Secure orifi ce fi xing screw (Item 1).
Figure 94
1
(NG orifice shown) (LP orifice shown)
5. After replacing with the new orifi ce, refer to section
11.1 Combustion
Analysis
in the installation instructions.
9.7 Air Pressure Switch
1. Refer to 9.1 Preparation Step.
2. Separate the silicon hose from the air mixer.
3. Loosen the air pressure switch fi xing screws (2 each, Item 3) and disconnect
the green wire.
Figure 95
1
2
3
4. Replace with a new air pressure switch and connect the green wire.
5. Tighten the fi xing screw and attach the silicon hose to the air mixer.
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