Grant 50/70 - Page 37

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Grant Vortex Indoor/Utility, System and Boiler House Oil Boilers
7 - COMMISSIONING
Note: After commissioning the boiler complete the
boiler passport that comes supplied with this boiler
and return the commissioning details to Grant
Engineering (IRL) Ltd.
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.
To adjust the 50/70 air adjuster disc when
downrating - See Fig. 24
1. Ensure the boiler is isolated from the electrical supply.
2. Disconnect the air supply tube.
3. Remove the burner from the boiler.
4. Undo the two screws and remove the air inlet cover
from the side of the burner.
5. The secondary air shutter disc is factory set in position
‘C’ – i.e. with the cut-out marked C located against
the die-cast boss on the fan housing - suitable for
outputs of 18.3 and 21 kW only. See Fig 24.
6. Remove the screw from the centre of the air shutter
disc, and re-position the disc such that the cut-out
‘B’ (corresponding to 15 kW output setting – See
Section 3.3) is located against the cast boss on the
fan housing. Replace the screw in the centre of the
air shutter disc and tighten.
7. Re-fit the air inlet cover to the side of the burner
and reassemble in reverse order.
Fig. 24 - 50/70 air adjuster disc at position 'C'
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