Technical data
COMMISSIONING
6 720 648 547 (2012/06) 31
5.6 COMMISSIONING
CHECKING GAS INLET PRESSURE:
The inlet pressure to the appliance must be checked using the following
procedure:
SETTING THE BOILER TO MAXIMUM:
1. Press performance test button (L) for ten seconds and set
temperature to maximum.
• The performance test button (L) will illuminate continually.
Fig. 44 Control panel
5.6.1 CHECKING THE GAS INLET PRESSURE
The inlet pressure to the appliance must be checked using the following
procedure:
MEASURING THE INLET PRESSURE
Fig. 45 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 46 or 47.
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.
Fig. 46 Natural gas pressures
A On/off button
B On/off and fault indicator (BLUE)
C Central heating temperature control
D Burner indicator (GREEN)
E Reset button
F Service button
HNot used
KDisplay
L Performance test button
MNot used
NOTICE: THE COMBUSTION FOR THE APPLIANCE IS
FACTORY SET.
NO ADJUSTMENT IS REQUIRED IF THE GAS INLET
PRESSURE IS CORRECT.
1
2
3
4
5
6
max
reset
eco
6720648547-49.1Wo
A
E
H
M
D
L
F
K
B
C
Inlet pressure
test point
6720647361-58.1Wo
Ensure inlet pressure is satisfactory with all other gas
appliances working.
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