Connect The Mains Supply; Commissioning; Fill The System - Baxi Luna 3 Comfort Notice D'installation Et D'entretien

...access to the power supply terminal block
1 isolate the electrical supply to the boiler by the
double-pole switch;
 unscrew the two screws securing the control
board to the boiler;
3 rotate the control board;
4 unscrew the lid and gain access to the wiring
(Figure 23).
The 2A fast-blowing fuses are incorporated in the
power supply terminal block (to check or replace
the fuses, pull out the black fuse carrier).
IMportant: be sure to connect polarities cor-
rectly l (LIVE) - n (NEUTRAL).
live (brown)
(L) =
(N) = neutral (blue)
( ) = Ground (yellow/green)
(1) (2) = room thermostat terminal
warNiNG: if the heating is directly connected to a floor heating system, a safety overheating thermostat should be
provided by the installer.
1 The boiler is fitted with an automatic air vent positioned on the pump (see Fig. 1). The vent is fitted with a non-sealing
cap.
 Open the central heating flow and return valves (spindle flats in-line with valve).
3 Open the fill point valve on the filling system until water is heard to flow. To aid venting, the boiler drain point may be
opened until water flows out. Close the drain point as soon as water appears.
4 In systems using radiators to remove the air - Vent each radiator in turn, starting with the lowest in the system.
5 It is important that the pump is properly vented to avoid it running dry and damaging its bearings. Unscrew and remove
the cap from the centre of the pump. Using a suitable screwdriver rotate the exposed spindle about half a turn, then
replace the cap.
6 Check the operation of the heating pressure relief valve by turning the head anti-clockwise until it clicks. The click is
the valve lifting off its seat allowing water to escape trom the system - check that this is actually happening.
7 Continue to fill the system until the pressure gauge indicates 14.5 p.s.i. / 1 bar. Close the fill point valve and check the
system for water soundness, rectifying where necessary.
Water may be released from the system by manually operating the drain point until the system design pressure is
obtained.
The system design pressure (cold) should be between 7.25 p.s.i. / 0.5 bar and 14.5 p.s.i. / 1 bar.
refer to section .8, system volume.
8 Open the mains water inlet valve (see Fig. 18-19). Turn on all hot water taps and allow water to flow until no air is present.
Turn off taps.
5.2 - test for gas soundness and purge the supply
1 With the boiler gas service cock closed (spindle flats at right angles to valve). Pressure test the gas supply and inlet
pipework connection to the boiler gas service cock for soundness.
 Loosen the gas inlet pressure test point screw on the gas valve (see Fig. 25). Ensure the gas supply is on and open the
boiler service cock to purge.
3 Retighten the test point screw and test for gas soundness. Close the boiler gas service cock.
InstructIons pertaInInG to tHe Installer

4.6 - connect the mains supply

Figure 3

5. commissioning

5.1 - fill the system

1
95.188.3 - GB