Checking The Gas Inlet Pressure; Checking The Gas Rate; Finishing Commissioning - Worcester GREENSTAR 30CDi Installation, Commissioning And Servicing Instructions

5.6.1 CHECKING THE GAS INLET PRESSURE

The inlet pressure to the appliance must be checked using the following
procedure:
NOTICE: The combustion for the boiler is factory set.
No adjustment is required if the gas inlet pressure is
correct.
MEASURING THE INLET PRESSURE
Inlet pressure
test point
Fig. 43 Inlet pressure test point
▶ Close gas isolation valve.
▶ Slacken the screw in the inlet pressure test point and connect a
manometer.
▶ Open gas isolation valve.
▶ Measure the pressure with the boiler running at maximum.
– Press performance test button (L) for more than ten seconds and
set Central Heating temperature to maximum.
– The performance test button (L) will illuminate continually and the
blue power indicator will pulse five times.
▶ Check the gas supply working pressure at the gas valve conforms to
values shown in figures 44 or 45.
Ensure inlet pressure is satisfactory with all other gas
appliances working.
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 the figure below, then
this would indicate a problem with the pipe work or connections within
the system.
Meter
Natural Gas
19 - 23 mbar
Boiler inlet
1 mbar
drop
18 - 22 mbar
Fig. 44 Natural gas pressures
6 720 806 548 (2013/02)
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.
6720647361-58.1Wo
Fig. 45 L.P.G. pressures
▶ If pressure is satisfactory press the performance test button (L) again
▶ If left in the performance test mode the control will return to normal
▶ 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
▶ Where a gas meter is not available (e.g. L.P.G.) the CO/CO
▶ If pressure and gas rate are satisfactory press the performance test
▶ Close the gas isolation valve.
▶ Remove the manometer.
Gas Control
▶ Re-seal the screw in the gas inlet pressure test point.
valve
▶ Open the gas isolation valve.
▶ Ensure that there are no gas leaks.
▶ Replace the outer case.
5.7
The boiler has been factory set, so there should be no need to adjust
combustion settings.
16.5 - 20.5 mbar
REPLACE OUTER CASING:
1.5 mbar 1. Replace outer casing making sure that the securing points are
drop
▶ Press the clip (A) downwards to secure casing on top.
▶ Retighten bottom two screws (B).
6720644744-44.1Wo
Regulator
L.P.G.
32 - 45 mbar
Boiler inlet
2.5 mbar
drop
29.5 - 42.5 mbar
NOTICE:
Do not continue commissioning until the correct gas
pressure is achieved.
and the boiler will return to normal operation.
operation after 15 minutes.
operation at maximum.
See technical data section at the front of this manual.
checked to the units shown in the setting of the air/gas ratio, refer to
section 6.2.
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.

FINISHING COMMISSIONING

properly located.
COMMISSIONING
Gas Control
valve
28 - 41 mbar
1.5 mbar
drop
6720644744-45.1Wo
must be
2
29