Owner manual
39
12 Commissioning
Commissioning should only be carried out by a competent
person approved at the time by the Health and Safety
Executive.
12.4 Initial Lighting
NOTE: The combustion for this appliance has been
checked, adjusted and preset at the factory for operation
on natural gas (G20) as dened on the appliance data
label.
Do not adjust the Gas/Air ratio valve.
No measurement of the combustion is necessary, having
checked :
● the appliance has been installed in accordance with the
instructions.
● the integrity of the ue system and ue seals.
● that all internal/external controls are calling for heat.
● the gas service isolation valve, diagram 12.1, is open.
DO NOT operate the boiler without water.
The lighting procedure of the boiler is fully automated.
Refer to diagram 12.2.
● With no demand from any external controls, switch on the
electrical supply to the boiler.
● Open the gas service isolation valve, see diagram 12.1.
● The appliance will enter a self checking routine then the
fan should start and the ignition will commence.
The boiler, if necessary, will automatically repeat the
ignition sequence a further 4 times.
● If the burner fails to ignite “F1” will be displayed, initially,
this may be due to air in the gas supply line.
● Once the system has been purged of air. Press and
hold the “ Mode “ button of the boiler user controls for 2
seconds, the Central Heating symbol,
will ash. Use the
“SELECTOR” buttons to adjust CH temperature.
Diagram 12.2
14513
After 10 seconds of inactivity the display will reset to indicate
the water temperature.
● Turn ON your external controls and select the room
temperature required.
The boiler will operate automatically.
NOTE: The display will indicate the Heating system water
temperature or a fault code if in a fault condition.
12.5 Check the Gas Inlet Pressure & Gas
Rate
The supply from the governed meter must be of adequate
size to provide a steady inlet working pressure of 20mbar (8in
wg) at the boiler. On completion, test the gas installation for
tightness using the pressure drop method and suitable leak
detection uid, purge as necessary.
NOTE: Due to the modulating operation of the boiler and
the need to check the gas inlet pressure and measure the
gas rate at maximum rate, it will be necessary to force it to
maximum.
Press the “reset” button on the controls fascia, release
and immediately press and hold in the “+” button. After
approximately 5 seconds “Hi” will be displayed. Pressing
the mode button when “Hi” is selected will force the boiler
to maximum rate, the display will ash between “Hi” and the
“default display” this will indicate the boiler has been forced to
maximum.
Operational Gas Inlet Pressure
With ALL other gas appliances operating, check the
operational supply pressure at the gas service isolation valve
test point, see diagram 12.1.
The nominal supply pressure for Natural Gas (G20) is 20mbar.
Turn the taps and appliances off, then disconnect the pressure
gauge.
MODE
MODE