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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 general
once per year should be adequate.
Servicing and replacement of parts must
only be carried out by a suitably qualified
engineer.
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 9.1.
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,
clean/replace the filter element and
clean the filter bowl.
9. Braided flexible fuel supply hoses (as
supplied with the boiler) should be
replaced annually. 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.
Before servicing, set the boiler On/Off
switch to Off (Kitchen/Utility models
only), 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(Kitchen/Utility models) or on
the front panel (Boiler House models) 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. Kitchen/Utility models - Pull the
front panel forward at the top to
disengage the fixing clips then lift it
up and off the boiler.
2. On System models, carefully lift up
and remove the expansion vessel
from the front of the boiler. Place the
vessel on the floor taking care not to
strain the flexible hose.
3. Disconnect the flexible air tube from
the burner.
4. Remove the burner fixing nut (top of
mounting flange) and withdraw the
burner.
If required, disconnect the flexible oil
hose(s), use a suitable container to
prevent any oil spillage.
If two flexible hoses are connected to
the burner, identify (mark if necessary)
which is the inlet and return if they are
to be disconnected.
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
Figures 11-1, 11-2, 11-3 or 11-4.
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, replace if
necessary.
6. Replace the baffles, ensuring they
are correctly fitted. See Figures 11-1,
11-2, 11-3 or 11-4.
7. Pull out the spiral turbulators from
the heat exchanger tubes. See
Figure 11-3.
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 22
mm condensate outlet. Replace the
turbulators.
10. Replace the front cleaning door,
ensuring the seal is in good condition
and secure it in position with the nuts
and washers previously removed.
Tighten to form a seal.
11. Remove the condensate trap and
check that it is not blocked and is
operating correctly, i.e. the float is
free to move. Clean the trap and float
as required. Refer to Section 6.8.
12. Check that the boiler condensate
outlet is unobstructed. Clean if
necessary.
The condensate trap and condensate
outlet must be checked on every
service and cleaned as necessary.
11
Boiler Servicing
Boiler Servicing
CAUTION
!
NOTE
!
WARNING
!
WARNING
!
NOTE
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