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Boiler Servicing
11 Boiler Servicing
To ensure efficient operation of the
boiler it is recommended that it is
checked and serviced as necessary at
regular intervals. The frequency of
servicing will depend upon the particular
installation conditions and usage, but in
g
eneral once per year should be
adequate.
Servicing and replacement of parts
m
ust only be carried out by a suitably
qualified engineer.
7. Remove any sludge/water from the
fuel tank by opening the sludge
valve at the lower end of the tank.
8. With the fuel supply valve closed,
c
lean/replace the filter element and
clean the filter bowl.
9. Braided flexible fuel supply hoses as
supplied with the boiler should be
replaced annually when the boiler is
serviced. If long-life hoses have
been installed, these should be
inspected annually. If in doubt
replace the hoses. In any event,
these hoses must be replaced every
five years.
11.3 Cleaning the Boiler
The procedure for cleaning the boiler is
as follows:
1. Remove the nuts and washers
securing the front cleaning door and
withdraw the door. Take care – it is
heavy.
2. Remove the baffles as shown in
Figure 11-1
3. Remove all deposits from the baffle
plates and all the boiler internal
surfaces using a stiff brush and
scraper if necessary.
4. Check the condition of the flue,
clean as necessary.
5. Check the condition of the front
cleaning door seal and replace if
necessary.
6. Replace the baffles, ensuring they
are correctly fitted.
7. Pull out the spiral turbulators from
the heat exchanger tubes.
8. Clean the turbulators using a stiff
brush.
9. Test the heat exchanger condensate
drain by pouring water into one of
the lower tubes and observe
whether the water discharges from
the 22mm condensate outlet.
Replace the turbulators.
Figure 11-1: Removing the baffles
!
WARNING
!
NOTE
!
CAUTION
Details of every service should be
entered in the Service Log, in the
Boiler Handbook.
This information may be required to
validate the Grant extended warranty.
Before starting any work on the
boiler, or fuel supply please read the
health and safety information given in
Section 14.
11.1 Checking Before Servicing
The following sequential checks should
be made before any servicing:
1. Check the flue terminal and ensure it
is not blocked or damaged.
2. Run the boiler and check the
operation of its controls.
3. Ensure that all water/fuel system
connections and fittings are sound.
Remake any joints and check the
tightness of any fittings that may be
leaking.
4. If the boiler is used on a sealed
central heating system, check the
system pressure, check the
operation of the pressure relief valve
and check the expansion vessel air
charge. See Section 7.2.
5. Refill, vent and re-pressurise
the system as necessary.
See Section 7.3.
6. Check that any ventilation openings
are adequate and are clear. See
Section 7.3.
Before servicing, set the boiler
On/Off switch to Off, isolate the
electricity supply and close the fuel
supply valve.
Allow the boiler to cool.
The data label on the inside of the case
side panel will indicate the fuel used and
the nozzle fitted.
11.2 Dismantling Prior
to Servicing
The procedure for dismantling the boiler
is as follows:
1. Remove the front panels.
2. On System models, carefully lift up
and remove the expansion vessel
from the boiler. Place the vessel on
the front of the boiler. A clip is fitted
to clip it on to the front edge of the
casing.
3. Disconnect the flexible air tube from
the burner.
4. Remove the burner fixing nut (top of
mounting flange) and rotate the
burner clockwise and withdraw the
burner. The burner has a lug to fit
over a bracket on the front of the
combustion chamber to hold it while
servicing takes place.
With two flexible hoses connected to
the burner, identify (mark if
necessary) which is the inlet and
return if they are to be disconnected.
!
WARNING
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