Technical data

COMMISSIONING
6 720 648 547 (2012/06)32
Refer to the figure below for L.P.G gas pressures.
The pressure at the boiler must not be less than the pressure read at the
meter minus 2.5 mbar.
The pressure drop from the meter to the gas valve must not be more than
4mbar for LPG.
If the pressure drops are greater than shown in the figure below, then
this would indicate a problem with the pipe work or connections within
the system.
Fig. 47 L.P.G. pressures
▶ If pressure is satisfactory press the performance test button (L) again
and the boiler will return to normal operation.
▶ If left in the performance test mode the control will return to normal
operation after 15 minutes.
▶ Re-seal the screw in the gas inlet pressure test point.
5.6.2 CHECKING THE GAS RATE
▶ The gas rate should be measured at the gas meter after 10 minutes
operation at maximum.
See technical data section at the front of this manual.
▶ Where a gas meter is not available (e.g. L.P.G.) the CO/CO
2
must be
checked to the units shown in the setting of the air/gas ratio, refer to
section 6.2.
▶ If pressure and gas rate are satisfactory press the performance test
button again and the boiler will return to normal operation.
– If left in the performance test mode the control will return to normal
operation after 15 minutes.
▶ Close the gas isolation valve.
▶ Remove the manometer.
▶ Re-seal the screw in the gas inlet pressure test point.
▶ Open the gas isolation valve.
▶ Ensure that there are no gas leaks.
▶ Replace the outer case.
5.7 FINISHING COMMISSIONING
The boiler has been factory set, so there should be no need to adjust
combustion settings.
REPLACE OUTER CASING:
1. Replace outer casing making sure that the securing points are
properly located.
▶ Press the clip (A) downwards to secure casing on top.
▶ Retighten bottom two screws (B).
INSTALLING BOTTOM PANEL:
2. The bottom panel slides onto two ledges (C) either side of the boiler
frame.
▶ Hold the panel up against the underside of the boiler and slide
towards the rear until it is fully engaged.
HANDOVER:
▶ Complete the Benchmark check list.
▶ Open the fascia cover by pulling the centre top of the cover (D).
▶ Set up the controls and show the user how to operate all the controls
shown in the User Guide.
▶ Place the user guide into the tray (E) on the inside of the facia cover.
▶ If the appliance is unused and exposed to freezing conditions; shut off
all the mains supplies and drain the system and boiler.
Fig. 48 Fitting outer case
NOTICE:
Do not continue commissioning until the correct gas
pressure is achieved.
Gas Control
valve
L.P.G.
Regulator
Boiler inlet
32 - 45 mbar
29.5 - 42.5 mbar
28 - 41 mbar
2.5 mbar
drop
1.5 mbar
drop
6720644744-45.1Wo
B
B
A