COMMISSIONING
6 720 815 724 (2015/11)34
Gas pressure within the system
Refer to the figure below for natural gas pressures.
The pressure at the boiler must not be less than the pressure read at the
meter minus 1 mbar.
The pressure drop from the meter to the gas valve must not be more than
2.5 mbar for natural gas.
If the pressure drops are greater than shown in fig. 52, this indicates a
problem with the pipe work or connections within the system.
Fig. 52 Natural gas pressures
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
4 mbar for LPG.
If the pressure drops are greater than shown in figure 53, then this
would indicate a problem with the pipe work or connections within the
system.
Fig. 53 L.P.G. pressures
▶ If pressure is satisfactory press the performance test button (J) again
and the boiler will return to normal operation.
▶ If left in the central heating boost mode the control will return to
normal operation after 15 minutes.
▶ Re-seal the screw in the gas inlet pressure test point.
5.5.2 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 service button
again and the boiler will return to normal operation.
– If left in the service 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.
NOTICE:
Do not continue commissioning until the correct gas
pressure is achieved.
Meter
Boiler inlet
Gas Control
valve
19 - 23 mbar
18 - 22 mbar
16.5 - 20.5 mbar
1 mbar
drop
1.5 mbar
drop
Natural Gas
6720644744-44.1Wo
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
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