Commissioning; Fill The System; Test For Gas Soundness And Purging The Supply; Boiler Controls - Baxi Luna HT 1.450 Notice D'installation Et D'entretien

1 Open the central heating flow and return valves.
2 Open the fill point valve on the filling system until water begins to flow. To aid venting, the boiler drain point may be
open until water flows out. Close the drain point as soon as water appears.
3 In systems using radiators to remove the air - Vent each radiator in turn, starting with the lowest in the system.
4 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.
5 Check the operation of the heating pressure relief valve by turning the head counterclockwise until it clicks. The click
is the valve lifting off its seat allowing water to escape from the system - check that this is actually happening.
6 Continue to fill the system until the pressure gauge indicates 21.7 psi / 1.5 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 1.0 bar and 1.5 bar.

12.2 TEST FOR GAS SOUNDNESS AND PURGING 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.
2 Loosen the screw of the pressure inlet gas test point on the gas valve (see Fig. 34). 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 shutoff device.
Fig. 30
1 Main selector switch
2 Central Heating function LED
3 DHW function LED
4 Flame LED
INSTALLATION AND SERVICING INSTRUCTIONS

12. COMMISSIONING

12.1 FILL THE SYSTEM

12.3 BOILER CONTROLS

5 Two digit Display
6 Central Heating Knob
7 DHW Knob
8 Pressure Gauge
38
7110242.02 - en