Commissioning
Greenstar 8000 Life – 6720883865 (2019/02)
40
▶ Check for gas tightness.
Fig. 63 Refit combustion casing
▶ Refit the combustion casing.
▶ Ensure this cover is engaged onto top bracket [1] before securing
screw [3].
Gas pressure within the system
The appliance must be running at maximum output rate when
performing the gas rate check, (
chapter 6.4).
Combi appliances
▶ Running a hot water tap does not guarantee the boiler will operate at
maximum output throughout the test.
Refer to the figures below for natural gas or L.P.G gas pressures.
The pressure drop from the meter or at the L.P.G. gas supply to the gas
valve inlet test point must not be more than:
• 40 kW or below (≤ 40 kw): 2.5 mbar for Natural Gas
• above 40 kW (> 40 kw): 3.5 mbar for Natural Gas
• 4 mbar for L.P.G.
Table 16
If the pressure drops are greater than shown below, then this would
indicate a problem with the pipe work or connections within the system.
NOTICE:
Do not continue commissioning until the correct gas pressure is
achieved.
Gas supply pressure drop
Fig. 64 Natural Gas pressures
[≤ ]
Less than or equal to
[>]
Greater than
Fig. 65 L.P.G. pressures
[≤ ]
Less than or equal to
[>]
Greater than
6.7
Checking the gas rate
▶ The gas rate should be measured at the gas meter after the appliance
has been operating for a minimum of 10 minutes at maximum output.
▶ Refer to Technical data section of this manual for the appliance gas
rates and CO/CO
2
ratios.
▶ Where a gas meter is not available (e.g. L.P.G.) the CO/CO
2
must be
checked.
▶ Gas rate must be checked with the appliance in service, maximum
output test mode.
▶ Carry out Gas rating procedures as described in current edition of the
“Essential Gas Safety”.
▶ Ensure all other gas appliances are isolated when carrying out the gas
rate check on the appliance.
▶ Set the chimney sweep mode and start up the appliance at maximum
rated output.
Allowed mbar pressure drop
Meter/
LPG supply
Across
pipe
work
Appliance
inlet
Across
appliance
Gas valve
Natural gas
19 - 23
1
18 - 22
≤ 40 kw: 1.5
> 40 kw: 2.5
≤ 40 kw: 16.5 - 20.5
> 40 kw: 15.5 - 19.5
L.P.G.
0010023566-001
3.
2.
1.
32 - 45
2.5
29.5 -
42.5
≤ 40 kw: 1.5
> 40 kw: 2.5
≤ 40 kw: 28 - 41
> 40 kw: 27 - 40
mbar range
0010023580-001
Natural Gas
Appliance inlet
18 - 22 mbar
1 mbar
drop
≤ 40 kW: 1.5 mbar
> 40 kW: 2.5 mbar
drop
Meter
19 - 23 mbar
≤ 40 kW: 16.5-20.5 mbar
> 40 kW: 15.5-19.5 mbar
Gas Control
valve
0010023572-001
Appliance inlet
L.P.G.
29.5 - 42.5 mbar
2.0 mbar
drop
0.5 mbar drop
≤ 40 kW: 1.5 mbar
> 40 kW: 2.5 mbar
drop
Regulator
LPG Storage
32 - 45 mbar
Gas Control
valve
≤ 40 kW: 28-41 mbar
> 40 kW: 27-40 mbar