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Commissioning
6.5
Commissioning
NOTICE: Factory preset combustion settings:
▶ The combustion settings on this gas-fired boiler have
been checked, adjusted and preset at the factory for
operation on the gas type defined on the data plate.
NOTICE: Commissioning requirement and information:
▶ Combustion values must be checked and recorded in
the Benchmark checklist, at the rear of this manual,
after commissioning.
▶ DO NOT ADJUST THE AIR/GAS RATIO VALVE.
▶ The gas valve is factory set and must not be adjusted
during commissioning if found to be out of tolerance,
please contact Worcester, Bosch Group.
When running in the service mode, the appliance will
operate both the central heating and the domestic hot
water circuits. This is to allow sufficient time for this part
of the commissioning procedure. It will be necessary to
run water through the domestic hot water circuit to
ensure that the appliance will not cycle on low heating
demands.
Before proceeding, ensure you have checked:
▶ That the appliance has been installed in accordance with the
installation instructions.
▶ The integrity of the flue system and flue seals, as described in
section 7.2 of this manual.
▶ The integrity of the appliance combustion circuit and relevant seals.
6.5.1
Checking the gas inlet pressure
The inlet pressure to the appliance must be checked using the following
procedure:
Measuring the inlet pressure
1
Fig. 45 Inlet pressure test point
▶ Close gas isolation valve.
▶ Slacken the screw in the inlet pressure test point [1] and connect a
manometer.
▶ Open gas isolation valve.
▶ Measure the pressure with the appliance running at maximum.
– Press the
button for at least 5 seconds.
– The service button will be lit continually and the chimney sweep
symbol
will be displayed at the top of the screen and the
word "Max" will flash at the bottom of the screen.
▶ Check the gas supply working pressure at the gas valve inlet point is
no less than the values shown in figures 46 or 47.
40
6.5.2
Gas pressure within the system
The appliance must be running at maximum output rate
when performing the gas rate check.
Refer to the figures below for natural gas or L.P.G gas pressures.
The pressure at the appliance inlet 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.
Natural gas
Allowed mbar pressure drop
meter/
across
appliance
regulator
pipework
inlet
19 - 23
1
18-22
L.P.G.
32 - 45
2.5
29.5 - 42.5
mbar range
Table 34
If the pressure drops are greater than shown below, then this would
indicate a problem with the pipe work or connections within the system.
Equal to or less than
Table 35
Natural Gas
Meter
≤ 2.5 mbar
difference
19 - 23 mbar
Boiler inlet
1 mbar
drop
18 - 22 mbar
Fig. 46 Natural gas pressures
L.P.G.
Regulator
≤ 4.0 mbar
difference
32 - 45 mbar
Boiler inlet
2.5 mbar
drop
29.5 - 42.5 mbar
Fig. 47 L.P.G. pressures
NOTICE:
▶ Do not continue commissioning until the correct gas
pressure is achieved.
Greenstar i System
across
inlet, gas
appliance
control valve
1.5
16.5 - 20.5
1.5
28 - 41
Gas Control
valve
16.5 - 20.5 mbar
1.5 mbar
drop
6720806944-61.1Wo
Gas Control
valve
28 - 41 mbar
1.5 mbar
drop
6720806944-62.1Wo
- 6 720 806 945 (2015/07)
ErP
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