Baxi LUNA 3 COMFORT MAX Installers And Users Instructions page 62

c) pressure adjusting device setting
• connect the positive pressure test point of a differential (possibly water-operated) manometer to the gas valve pressure
test point (pb) (Figure 13); 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.
honeywell valve
mod. vK 4105 M
Figure 13
c1) adjustment to nominal heat output
• open the gas tap;
• press button (figure 1) and set the boiler in winter mode;
• open a hot water tap to reach a minimum 10 l/min flow rate or ensure that max­imum heating requirements are set;
• check that boiler feeding dynamic pressure, as measured at the inlet gas valve pressure test point (pa) (figure 13) is
correct (37 mbar for propane gas G.31, 20 mbar for natural gas G20);
• remove the modulator cover;
• adjust the tube brass screw (a) figure 14 to obtain the pressure settings shown in table 1;
c2) adjustment to reduced heat output
• disconnect the modulator feeding cable and unscrew the (b) figure 14 screw to reach the pressure setting corresponding
to reduced heat output (see table 1);
• connect the cable again;
• fit the modulator cover and seal.
c3) Final checks
• apply the additional dataplate, specifying the type of gas and settings applied.
honeywell gas valve
Figure 14
instructions pertaininG to the installer
sit valve
mod. siGMa 845
pc
pb
pa
sit gas valve
a
b
62
925.480.1 - GB