Boiler Controls; Initial Lighting; Gas Change Modalities - Baxi Luna 3 Comfort Series Installation And Servicing Instructions

Fig. 4
refer to Fig. 4
note: Remove the protective plastic coating from the boiler painted panels before lighting.
1 Ensure that the gas and electrical supplies to the boiler are off and that the mains water inlet valve and the central
heating flow and return valves are open.
 Turn on the gas and electrical supplies to the boiler.
3 Ensure all external controls are calling for heat.
4 Press the button to enable the SUMMER mode (DHW only), the display shows the
5 Open a hot water tap, the burner will light and the boiler will provide hot water. Close the tap and the burner will go
out.
6 Press the button to enable the HEATING ONLY (
The boiler will now run in the central heating mode. The pump will start, the fan will start; once the pressure switch is
proved, the main gas valve solenoid will open allowing the burner to light from the ignition electrodes
A Qualified Service Engineer may adapt this boiler to operate with natural gas (a) or with LP gas (e).
The procedure for calibrating the pressure regulator may vary according to the type of gas valve fitted (HONEYWELL or
SIT; see figure 25).
Carry out the following operations in the given sequence:
a) substitute the burner injectors;
B) change the modulator voltage;
C) proceed with a new max. and min. setting of the pressure adjusting device.
a) substitute the main burner injectors
• carefully pull the main burner out of its seat;
• substitute the main burner injectors and make sure you tighten them to avoid leakage. The diameters of the injectors
are specified in table 1.
B) change the modulator voltage
• setting F0 parameter according to the gas used as described in section 19.
c) pressure adjusting device setting (see Figure 5)
• connect the positive pressure test point of a differential (possibly water-operated) manometer to the gas valve pres-
sure test point (pb); connect, for sealed chamber models only, the negative pressure test point of the manometer to a
"t" fitting in order to join the boiler adjusting outlet, the gas valve adjusting outlet (pc) and the manometer. (The same
measurement can be carried out by connecting the manometer to the pressure test point (pb) after removing the sealed
chamber front panel);
If you measure the pressure of burners in a different way you may obtain an altered result in that the low pressure created
in the sealed chamber by the fan would not be taken into account.
InstructIons pertaInInG to tHe Installer

5.3 - boiler controls

note: see the instructions for the user for keys

5.4 - initial lighting

) mode (CH only) or WINTER (

5.5 - gas change modalities


symbol.
) mode (CH and DHW).
95.188.3 - GB