28
Grant Vortex Outdoor Module
6 - COMMISSIONING
11 Relight the boiler and allow it to run for 20 minutes
then check the following:-
CO
2
level, Flue gas temperature and Smoke Number.
Refer to the Technical Information in Section 3.3.
Insert combustion probe into the end of the flue
terminal to measure the CO
2
level.
Do not use the test point on top of the boiler.
12 Check the smoke number, if satisfactory check the
CO
2
. Use the hexagonal key supplied to adjust the
burner air damper (see Fig. 17) as required. Turning
the screw clockwise opens the damper and reduces
CO
2
level, turning the screw anticlockwise closes the
damper and increases CO
2
level.
Re-check the smoke number if the air damper has
been moved.
Under no circumstances must the smoke number be
above 1.
A suitable position for the air damper is one which
gives 1% less CO
2
than that which has a smoke
number of 1.
Note: To obtain the correct CO
2
level, the final
flue gas reading must be taken with all casing
panels fitted.
Note: It is important that the air damper is
correctly set.
13 Check the flue gas temperature.
14 When the boiler has been adjusted and is running
satisfactorily, balance the central heating system by
adjusting the radiator lock shield valves. Start with
the radiator nearest the boiler and adjust the valves
to achieve the required temperature drop across
each radiator.
If thermostatic radiator valves have been installed,
check the system by-pass.
15 Check that the condensate trap and pipe are
discharging the condensate to drain.
16 Switch off the boiler.
17 With the hot water system hot, check again for
leaks, rectifying where necessary. Drain the system
while it is hot to complete the flushing process.
Refill and vent (and pressurise if a sealed system)
the system.
18 A suitable central heating system inhibitor must be
added to protect the system against the effect of
corrosion.
19 Replace the top, front and rear panels.
If the boiler is to be left in service with the User, set
the controls and room thermostat (if fitted) to the
User's requirements then refer to Section 6.
If the boiler is not to be handed over immediately,
close the boiler fuel supply valve and switch off the
electricity supply.
If there is any possibility of the boiler being left during
frost conditions, then the boiler and system should be
drained.
IMPORTANT NOTE:
To allow the boiler to be commissioned and serviced
correctly a combustion test point is provided on the front
cleaning door.
The CO
2
and smoke test may all be carried out using this
test point. The test point is not suitable for measuring
boiler efficiency or conventional flue draught.
When using the test point on the cleaning cover note that
the flue gas temperature reading will be higher than that
measured in the flue thus resulting in an inaccurate
efficiency reading. To obtain an accurate flue gas
temperature and efficiency, the reading can only be
measured at the low level flue terminal or the test point
on the conventional flue starter elbow where fitted.
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