35
Grant Vortex Oil Boilers
6 - COMMISSIONING
10 With the burner alight, re-check the fuel pressure and
re-adjust if necessary. Turn the boiler off, remove the
pressure gauge and replace the plug in the pump.
11 Having ensured that there are no oil leaks, replace the
burner cover. Ensure the flexible air tube is connected
to the burner (balanced flue models).
12 Relight the boiler and allow it to run for at least 20
minutes.
13 Check the smoke number, if satisfactory check the
CO
2
. Set the CO
2
to the value given in Section 3.3
for the boiler concerned.
Use the hexagonal key supplied to adjust the
burner air damper (see Fig. 22) as required.
Turning the screw anti-clockwise closes the
damper and increases CO
2
level, turning the screw
clockwise opens the damper and reduces CO
2
level.
Re-check the smoke number if the damper has been
moved. Under no circumstances must the smoke
number be above 1.
Note: It is important that the air damper is
correctly set.
14 Check the flue gas temperature.
15 Check that both the boiler overheat and boiler control
thermostat bulbs are correctly located in their
respective pockets. For location of thermostat pockest,
refer to Figs. 12, 15 or 16 - depending on the boiler
model concerned.
Also check the condition of both thermostat capillaries,
i.e. that they are not damaged, broken or kinked, and
that they are not trapped or crushed between any
internal boiler components.
16 Replace the case top.
17 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.
18 Switch off the boiler.
19 With the 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.
20 A suitable central heating system inhibitor must be
added to protect the system against the effect of
corrosion.
21 Close the front door panel (Kitchen models) or
replace the front panel (Utility models).
Note: After commissioning the boiler complete the
Commissioning Report on page 2 of these
instructions and the OFTEC CD/11 commissioning
report. Leave the top copy with the User and retain
the carbon copy.
If the boiler is to be left in service with the User, set the
controls, timer (If optional programmer is fitted, see
instructions supplied in kit) and room thermostat (if
fitted) to the User's requirements.
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 outside through the low level flue terminal. For
high level and vertical balanced flues the reading may be
taken from the flue kit test point provided . Refer to
Section 3.3.
For Conventional flue draught measurement and
efficiency a test point is provided in the conventional flue
adaptor.
