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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
9.18 Heat Exchanger
WARNING: FIRE, EXPLOSION, PERSONAL INJURY
Prior to performing any work on the boiler, ensure the gas
supply is turned off and power unplugged .
1. Refer to 9.1 Preparation Step.
2. Drain the water using the drain valve and water fi lter (Item 1).
Figure 118
1
3. The Heat Exchanger and Turbo Fan will come out as one complete unit.
However, if there is not space to remove all together, separate the fan from
the heat exchanger according to Section 9.16.
4. Loosen fi xing screw on bottom right hand side of heat exchanger cover
and Remove heat exchanger cover and disconnect fl ame rod and electrode
assembly wires (Fig.120, Item 2).
Figure 119
2
5. See Figure 121. Separate
the fan connection terminal (Item 1), solenoid
valve terminal (Item 2),
overheat prevention device wire (Item 3), and heat
exchanger temperature sensor (Item 4).
Figure 120
1
2
4
3
6. Separate the gas pipe (Item 1)using a wrench.
Figure 121
1
1
7. Loosen 2 screws and remove ignition transformer (Fig.123, Item 1) and save
for reinstallation.
8. Unclip exhaust sensor connector (Fig.123, Item 2).
Figure 122
2
1
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