COMMISSIONING
6 720 803 800 (2012/11)
34
Fig. 63 Setting boiler to maximum
▶ Check the gas supply working pressure at the gas valve conforms to
values shown in Fig. 64 or Fig. 65 .
▶ Press the
button to return to normal operation.
▶ The boiler will run for 15 minutes in service mode and return to normal
if no other inputs are made.
After the tests are completed:
▶ Disconnect the manometer.
▶ Retighten, but do not overtighten the inlet pressure test point screw.
GAS PRESSURE WITHIN THE SYSTEM
Refer to the figures below for natural gas or L.P.G gas pressures.
The working pressure at the boiler must not be less than the working
pressure read at the meter minus 1mbar for natural gas or minus
2.5mbar for L.P.G.
The pressure drop from the meter to the gas valve must not be more than
2.5mbar for natural gas or 4mbar for L.P.G.
If the pressure drop is greater than shown below, then this would
indicate a problem with the supply pipe work which must be rectified.
Fig. 64 Natural gas pressures
Fig. 65 L.P.G. pressures
5.5.2
CHECKING THE GAS RATE
▶ The gas rate should be measured at the gas meter after the boiler has
been operating for a minimum of 10 minutes at maximum output.
▶ See Technical data section on page 8 of this manual for 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.
5.5.3
GAS RATING TEST
▶ Ensure all other gas appliances are isolated.
1. Set the boiler to maximum output by pressing
and the
button
together for at least 5 seconds.
The chimney sweep symbol (1) will be displayed at the top of the
screen and the word “Max” will flash at the bottom of the screen. The
boiler will ramp up to maximum output in 30 to 35 seconds.
Fig. 66 Setting boiler to maximum
▶ Ensure that the boiler has stabilised at maximum output.
▶ Carry out Gas rating procedures as described in “Essential Gas
Safety” third edition.
▶ If pressure and gas rate are satisfactory press the
button and the
boiler will return to normal operation.
– If left in the service mode the control will return to normal operation
after 15 minutes.
5.5.4
CHECKING FOR LEAKS DURING OPERATION
▶ Use an approved leak detector to check all connections for possible
leaks. The product must be certified as a gas leak testing agent.
Ensure that the inlet pressure is satisfactory with all
other gas appliances working.
max
min
2
3
1
0
4
bar
1
ok
eco
reset
e
max
min
°C
°F
Max
6720646608-45.1W
o
°C
°F
Max
1.
1
≈≈
5 s
5 s
ok
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
NOTICE:
Do not continue commissioning until the correct gas
pressure is achieved.
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
eco
max
min
2
3
1
0
4
bar
1
ok
eco
reset
e
max
min
°C
°F
Max
6720646608-45.1W
o
°C
°F
Max
1.
1
≈≈
5 s
5 s
ok
