64
Gas pipe
mixer
air intake
pipe
Gas valve
fig. 33
fig. 34
fig. 35
fig. 36
o-ring
nozzles
Venturi to mixer
retaining screws
Gas fitting
Retaining screws
direction tab
3.7.3.
Gas Valve Setting
3.7.3.1. Maximum heating output adjustment
- Make sure that the ambient thermostat (optional), if fitted, is set to ON.
- Select the "heating" mode on the control panel pressing key n times until symbol is displayed.
- Start the ‘flue cleaning’ function keeping key pressed until symbol stops flashing. Boiler switches to max. output operation.
- If a gas switching has been made, access the programming page and set the P0-P4-P5-P6-P7-P8 parameters based on the power and on the gas,
as specified in tab. 20.
- Set the flue (CO
2
) rate by turning the ratio adjuster B (fig. 37) and ensure that reading falls within the limits of tab. 19. Let boiler flue cleaning
function on and continue with the next point ”Minimum heating output adjustment" .
3.7.3.2. Minimum heating output adjustment
- Set boiler min. output operation by keeping symbol ‘-’ pressed on the heating temperature adjustment key until the value corresponding to fan
min. speed for the output and boiler gas (refer to tab. 20) is displayed.
- Boiler switches to min. output operation.
- Set the flue (CO
2
) rate by turning the offset adjuster C (fig. 37) and ensure that reading falls within the limits of tab. 19.
- Keep key pressed to end the flue cleaning function.
