29
P6
maxR
SPA
Turn knob 9 (pic. 1) to WINTER and the room thermostat (if there is one) to ON.
While the boiler is operating, press the SPA button for a few seconds (A, pic. 22). The boiler will turn off and then resume the
ignition sequence, starting again at the max power. Maximum boiler power output MAX R is as much as set point MAX R (B,
pic. 22).
The “Chimney sweep” function remains active for 15 minutes. To deactivate this function, turn selector 9 to any position other
than WINTER.
3.2.8.2. Checking combustion performance
Coaxial pipe system
Proceed as follows to verify combustion performance.
• Measure air intake through hole 2 (A, pic. 23).
• Measure flue gas and CO
2
temperature through hole 1 (A, pic. 23).
Allow the boiler to reach working temperature before taking the readings.
Split pipe system
Proceed as follows to verify combustion performance.
• Measure air intake through hole 2 (B, pic. 23).
• Measure flue gas and CO
2
temperature through hole 1 (B, pic. 23).
Allow the boiler to reach working temperature before taking the readings.
3.2.9. Gas mains connection
The cross-section of the gas supply pipe must be equal to or greater than that of the boiler gas pipe. Calculation of the cross-
section of the gas pipe depends on the length, layout pattern and gas flow rate. The size of the gas pipe must be dimensioned
accordingly.
Comply with the applicable laws in the country of installation. They are considered as an integral part of this booklet.
Remember that before operating an internal gas distribution system and before connecting it to a meter,
it must be checked for leaks.
If any part of the gas system is inaccessible, a leak test must be carried out before the pipes are covered.
Leak tests must not be carried out using flammable gas. Use air or nitrogen for this purpose.
When boiler supply gas is already in the pipes, checking for leaks with a naked flame is strictly forbidden.
Use a specific products available on the market.
IT IS MANDATORy when connecting the boiler to gas mains, to use a gasket of an appropriate size and make (A).
The configuration of the boiler gas inlet thread is not appropriate for hemp, plastic tape or similarly
made gaskets.
pic. 22 - “Chimney-sweep” function
pic. 23 - Examples of combustion
efficiency measuring points
GASKET
pic. 24 - Gas mains connection
Analyzer probes
Air
Flue gas
