Special Functions; Initial Ignition; System Gas Extraction Function; Chimney Sweeper - Baxi NUVOLA DUO-TEC GA 16 Instruction Manual For Users And Fitters

12. SPECIAL FUNCTIONS

12.1 INITIAL IGNITION

When lighting the boiler for the first time perform the following procedure. After electrically powering the boiler the code "000"
appears on the display. This means the appliance is ready for the "initial lighting" procedure.
• Press together and hold down for 6 seconds. "On" appears on the display for 2 seconds followed by code "312" indica-
ting that the "system venting" function is active. This function lasts 10 minutes.
• Afterwards, the boiler switches on, the display shows the code "000" alternating with the % of ignition power. During this "gas
recognition function" phase, that lasts approximately 7 minutes, the type of gas used is analysed. During this function ensure
the maximum heat exchange to the system in Heating or DHW mode (DHW request) in order to avoid the boiler shutoff for
overheating.
• When these 7 minutes have elapsed, the type of gas detected appears on the display for 10 seconds: nG (natural gas e.g.
G20) or LPG (liquid gas e.g. G31).
• If the gas detected by the boiler is of the same type as that of the factory setting (section 14 - parameter P02) the procedure
terminates and the boiler starts normal operation.
• If the gas detected by the boiler is different, the display will continue to show nG or LPG.
In this case, there are two possible solutions:
• press for 6 seconds to confirm the type of gas detected. Parameter P02 (section 14) is automatically updated.
• press together for 4 seconds to exit the function without saving.
If the venting and gas recognition functions are interrupted by a power blackout before they terminate, they will start again
from the beginning when power is restored. If the gas recognition function is interrupted due to a fault (e.g.: E133 no gas)
after RESET, repeat the procedure described in section 12.1 to enable it.
During initial ignition, the burner may not ignite (causing the boiler to shut down) until any air in the gas pipes is vented.
In this case, repeat the ignition procedure until gas reaches the burner. To reset boiler operation, press
seconds.
For the first few ignitions immediately after installation the system must implement a self-learning procedure to reach the
correct ignition level.

12.2 SYSTEM GAS EXTRACTION FUNCTION

This function is used to facilitate the elimination of the air inside the heating circuit when the boiler is first installed or after mainte-
nance when the water is drained from the primary circuit.
To enable the system gas extraction function press buttons
on the display for a few seconds, followed by programme row 312.
The electronic board will activate a pump on/off cycle lasting 10 minutes. The function will automatically stop at the end of the
cycle. To manually exit this function, press the above buttons together for 6 seconds once again.

12.3 CHIMNEY SWEEPER

This function enables the boiler to generate maximum heating power. After activation, the boiler power % can be adjusted from
minimum to maximum in the DHW mode. The following procedure is used.
• Press buttons and
seconds followed by programme row "303" alternated with the % of boiler power.
• Press to gradually adjust power (sensitivity 1%).
• To exit press both buttons together for at least 6 seconds, as described in point one.
Press to display the instantaneous flow temperature for 15 seconds.
together for at least 6 seconds. When the function is enabled, the displays shows "On" for a few
together for 6 seconds. When the function is active, On appears
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for at least 2
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