COMMISSIONING | 27
6 720 ... ... (YYYY/MM)Product Name
Setting the boiler to maximum output
3. Press the / button together with the button to enter the
“Chimney sweep mode” , the display shows the current flow
temperature and flashes the percentage heat output in the
alphanumeric display. The burner symbol will be shown in the
display.
Press the + or - buttons until the required percentage output is
displayed. Set the output to 100% initially.
Fig. 33 Operating the boiler
4. If the boiler fails to light, press the reset button until the reset line of
text displays. The device goes back into operation and the flow
temperature is displayed.
5. Press the button at any time to return to normal operation.
7.5 Checking gas inlet pressure
7.5.1 Measuring the inlet pressure
▶ Remove the front panel figure 23
▶ Remove the combustion chamber cover.
The inlet pressure to the appliance must be checked using the following
procedure:
Fig. 34 Inlet 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 output.
▶ Check the gas supply working pressure at the gas valve conforms to
values shown in table 15.
Gas pressure within the system
If the gas pressure, for your gas type, is below the minimum shown in
table 15, then this would indicate a problem with the pipe work or
connections within the system.
▶ If pressure is satisfactory press the button and the boiler will
return to normal operation.
▶ If left in the central heating boost mode the control will return to
normal operation after 30 minutes.
▶ Re-seal the screw in the gas inlet pressure test point.
7.5.2 Checking the gas rate
▶ The gas rate should be measured at the gas meter after 10 minutes
operation at maximum.
See technical data section at the front of this manual.
▶ Where a gas meter is not available (e.g. L.P.G.) the CO/CO
2
must be
checked to the units shown in section “Setting the air/gas ratio”.
▶ If pressure and gas rate are satisfactory press the button and the
boiler will return to normal operation.
– If left in the “Chimney sweep” mode the control will return to
normal operation after 30 minutes.
▶ Close the gas isolation valve.
▶ Remove the manometer.
▶ Re-seal the screw in the gas inlet pressure test point.
▶ Open the gas isolation valve.
▶ Ensure that there are no gas leaks.
▶ Replace the outer case.
7.6 Finishing commissioning
1. Refit and secure the inner combustion chamber cover with the four
screws removed earlier.
2. Locate the lower edge of the front panel onto the brackets and
engage ball catches into the receptors in each side panel.
HANDOVER:
▶ Complete the Commissioning checklist supplied.
▶ Set up the controls and show the user how to operate all the controls
shown in the User Guide.
▶ If appropriate instruct the customer how to repressurise the system.
▶ If the appliance is unused and exposed to freezing conditions, advise
the customer of the precautions necessary to prevent damage to the
boiler, system and building.
In the event of the appliance being inoperative, isolate the boiler and
drain the system and boiler.
7.7 Commissioning checklist
▶ After commissioning, confirm work carried out, enter values, sign
and date to complete.
The boiler will run at maximum output for 30 minutes
before switching back to normal operation.
Ensure inlet pressure is satisfactory with all other gas
appliances working.
6 720 619 605-16.1O
6720809859-89.1Wo
A
Gas type min.pressure (mbar) max. pressure (mbar)
G20 17 25
G25 22 30
G31 25 45
Table 15 Gas pressure range
NOTICE:
Do not continue commissioning until the correct gas
pressure is achieved.
At the time of commissioning, complete all relevant
sections of the Commissioning Checklist supplied.
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