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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
9. Replace the gas connector and the gas inlet pipe to its original position and
secure all connections.
10. Turn on the gas and water supply to the boiler.
11.1 Combustion Analysis
WARNING:
Be sure to turn off the power before changing the DIP switch
setting.
1. Set the DIP switch to minimum heat capacity operation.
For more information about setting the DIP switches, refer to "Setting the
DIP Switches" on page 38.
2. Loosen the screw, remove the bracket and the cap to access the exhaust
analyzer hole.
Figure 82
Exhaust analyzer hole
Cap
Bracket
3. Insert analyzer into the exhaust analyzer hole and measure the gas/air ratio
(using combustion analyzer is recommended)
Type
High fi re Low fi re
CO2 (%) CO2 (%)
NG 9.5 ± 0.5
9.9 ± 0.5
LPG 9.5 ± 0.5
11.5 ± 0.5
Table 25
Figure 83
4. Fully open several hot water fi xtures and if the CO2 value at low fi re is not
within 0.5% of the value listed in the table above, the gas valve set screw
will need to be adjusted. If adjustment is necessary, locate the set screw.
Using a 5/32” or 4mm Allen wrench, turn the set screw a 1/4 turn at a time.
Clockwise to raise or counterclockwise to lower the CO2 value.
WARNING:
Improper gas valve settings can cause severe injury, death or
property damage.
Figure 84
Set screw
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