Commissioning
Page 43
10.6 RUNNING THE BOILER
1. Relight the boiler and allow it to run for at least 20 minutes.
2. Check the smoke number, if it is 0-1 then it is satisfactory.
3. Using a calibrated electronic fl ue gas analyser, set to the
correct fuel, check the CO₂% in the fl ue gases.
4. Set the CO₂%, as indicated on the fl ue gas analyser, to
the required value as given in Section 2.3 for the boiler
concerned.
5. Adjust the burner air damper, using the hexagonal key
supplied, to achieve the required CO₂%. Refer to Section 11-9.
6. To increase the CO₂%:
• Turn the screw anti-clockwise. This will close down the
burner air damper and decrease the combustion air
entering the burner.
To decrease the CO₂%:
• Turn the screw clockwise. This will open up the burner
air damper and increase the combustion air entering the
burner.
7. When the CO₂% is set to the correct level, re-check the smoke
number if the burner air damper has been moved. Under no
circumstances must the smoke number be above 1.
10.7 BALANCING THE SYSTEM
1. 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 bypass.
2. Switch off the boiler.
10.8 COMPLETION
1. With the system hot, check again for leaks, rectifying where
necessary. Drain the system while it is hot to complete the
fl ushing process. Refi ll and vent the sealed system.
2. A suitable central heating system inhibitor must be added to
protect the system against the effect of corrosion.
3. A suitable antifreeze should be used to prevent damage to
the boiler in areas where electrical power failure can occur in
winter months.
4. Replace the top, front and rear panels as necessary.
If the boiler is to be left in service with the User, set the controls and
room thermostat (if fi tted) 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.
When using the test point on the cleaning cover note that the fl ue
gas temperature reading will be higher than that measured in the
fl ue thus resulting in an inaccurate effi ciency reading. To obtain an
accurate fl ue gas temperature and effi ciency, the reading can only
be measured outside through the low level fl ue terminal (or the test
point on the conventional fl ue starter section when used).
10.9 INFORMATION FOR THE USER
The User must be advised (and demonstrated if necessary) of the
following important points:-
• How to start and switch off the boiler and how to operate the
system controls.
• The precautions necessary to prevent damage to the central
heating system and to the building, in the event of the boiler not
being in operation during frost conditions.
• The importance of servicing the boiler to ensure safe and
effi cient operation. This should normally be required only once
a year.
• The type of fuel used.
• That any servicing or replacement of parts must only be carried
out by a suitably qualifi ed engineer.
• Ensure that the boiler controls and room thermostat (if fi tted)
are set to the User’s requirements.
• Tell the User the system pressure and show them the position of
the safety valve discharge pipe.
• Show the User how to reset the overheat thermostat and how to
restart the boiler if it goes to ‘Lockout’.
WARNING
Check cleaning door seal, boiler/fl ue seal and
burner fl ange seal with fl ue gas analyser for
a minimum of 60 seconds and a distance of
100mm (from each seal) to ensure there is no
leak of fl ues gases.
For safe and effi cient operation of the boiler it
is essential that the air damper is correctly set
to give the required %CO2 in the fl ue gases.
NOTE
After commissioning the Boiler Passport.
Return the top copy to Grant Engineering,
retain the middle copy for the engineers own
records and leave the fi nal copy in the Passport
for the users records.
NOTE
If there is any possibility of the boiler being
left during freezing conditions, then the boiler
and system should be drained. Alternatively,
a suitable heating system antifreeze should be
used.
CAUTION
To allow the boiler to be commissioned and
serviced correctly a combustion test point is
provided on the front cleaning door. Both the
%CO
2
and smoke test may all be carried out
using this test point.
This test point is NOT suitable for measuring
boiler effi ciency or conventional fl ue draught.
NOTE
