Checking The Gas Rate; Domestic Hot Water; Finishing Commissioning; Replace Outer Casing - Worcester Greenstar i Series Installation, Commissioning And Servicing Instructions

COMMISSIONING
Ensure inlet pressure is satisfactory with all other gas
appliances working.
GAS PRESSURE WITHIN THE SYSTEM
Refer to the figures below for natural gas or L.P.G gas pressures.
The pressure at the boiler must not be less than the pressure read at the
meter minus:
• 1 mbar for Natural Gas
• 2.5 mbar for L.P.G.
The pressure drop from the meter to the gas valve must not be more
than:
• 2.5 mbar for Natural Gas
• 4 mbar for L.P.G.
If the pressure drops are greater than shown below, then this would
indicate a problem with the pipe work or connections within the system.
Meter
Natural Gas
< 2.5mbar
difference
19 - 23 mbar
Boiler inlet
1 mbar
drop
18 - 22 mbar
Fig. 66 Natural gas pressures
≤
Equal to or less than.....
Regulator
L.P.G.
< 4.0mbar
difference
32 - 45 mbar
Boiler inlet
2.5 mbar
drop
29.5 - 42.5 mbar
Fig. 67 L.P.G. pressures
NOTICE:
Do not continue commissioning until the correct gas
pressure is achieved.

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
checked to the units shown in the setting of the air/gas ratio, refer to
section 6.6.
32
▶ If pressure and gas rate are satisfactory press the service button again
▶ 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.

5.5.3 DOMESTIC HOT WATER:

Controlling the hot water temperature:
The hot water temperature can be set to between approximately 40°C
Gas Control
and 60°C using the DHW temperature control.
valve
5.6

5.6.1 REPLACE OUTER CASING:

▶ Replace outer casing making sure that the securing points are
▶ Replace top two screws (1).
16.5 - 20.5 mbar
▶ Tighten bottom two screws (2).
1.5 mbar
drop
6720644744-44.2Wo
Gas Control
valve
28 - 41 mbar
1.5 mbar
drop
6720644744-45.2Wo
Fig. 68 Fitting case
must be
2
and the boiler will return to normal operation.
– If left in the service mode the control will return to normal operation
after 15 minutes.
NOTICE: Domestic Hot Water
▶ The hot water temperature can only be controlled
when the "Optional diverter valve" kit is fitted.

FINISHING COMMISSIONING

properly located.
1.
1.
2.
2.
6 720 804 532 (2012/09)