9. Remove and clean the oil pump internal filter using kerosene or
white spirit. The internal filter is accessed by removing the oil
pump cover on the Danfoss BFP 11 and Suntec AS47C and by
unscrewing and withdrawing the cartridge on the Danfoss BFP 41
as indicated in Fig. 12.
9. It is recommended that the standard flexible oil line is
replaced at each yearly service to prevent the possibility of a
leak due to ageing.
10. Reassemble the burner components.
11. Check the sponge O-ring seal located around the
combustion head and replace if necessary. It is imperative that
this seal is in good condition since failure will cause flue gases to
be re-circulated into the burner inlet or the room in the case of a
CF/LLD appliance.
18.4 Remove the paper element from the external oil filter and
replace it. If the filter contains a washable element, thoroughly
clean in kerosene or white spirit and reassemble into the filter.
18.5 Clean the air ducts. (RS balanced flue model only).
1. Remove the rear duct top cover.
2. Shine a light down the rear duct and inspect both the rear
and under duct for any sign of debris and clean where necessary
using a flexible hose connected to a vacuum cleaner. A short
length of garden hose would be suitable for this purpose.
3. Replace the rear duct top cover.
4. Check the oil bleed holes are clear. These are located in the
base of the burner cover box and bottom front face of the
burner housing.
18.6 Clean the Boiler
1.
Remove the boiler top access door by releasing the two M10
nuts, check the fibreglass rope seal and replace if necessary.
2. Remove and check the baffle retainer where fitted (20/25 and
26/32 models only.See Fig.27c).
3. Remove the baffles, clean and check their condition. Replace
any baffles considered to be badly corroded.
4. Thoroughly clean all of the heat exchanger surfaces using a
stiff wire brush and vacuum clean all loose debris from the
combustion chamber. Take care not to damage the base
insulation!
5. Remove and check the heat shield (20/25 and 26/32 models
only).(See Fig.27c).
6. Check the condition of the combustion chamber base
insulation and replace if there is any sign of damage.
7. Check and clean the flue system if necessary.
8. Replace the items in reverse order noting the baffle positions
shown in Fig.27.
18.7 Check that a fire valve is fitted to the incoming oil line with
the body located outside the premises and the detection
element located within the appliance case. A fire valve clip is
provided for this purpose as shown in Figs 3,4,5 and 6. Test the
operation of the fire valve to ensure that the mechanism
operates and that the oil supply is completely isolated.
NOTE: The fire sensing element must be located on the top face
of the burner surround box on RS balanced flue models, as
shown in Fig.4 and 6, to allow quick detection of a dangerous
situation.
18.8 Re-commission the Burner
1.
Connect the flexible oil supply hose to the isolating valve
bulkhead fitting and tighten sufficiently to form a good seal.
Where a double pipe system is being used connect the oil return
flexible hose to return pipe fitting.
2. With the sponge O-ring gasket around the burner blast tube
insert the burner into the housing tube. Push the burner firmly
forward to compress the gasket and tighten the two locking
screws using a 5mm Allen key.
NOTE: It is important that a good seal is made between the
burner and the boiler to prevent re-circulation of the flue gases
from the combustion chamber to the burner inlet, or the room in
the case of a CF/LLD appliance.
3. On the RS balanced flue model feed the electrical lead back
through the hole in the burner surround housing and fit the
grommet into the hole ensuring a seal is made.
4. Reconnect the electrical lead plug into the control box.
5. Turn on the oil supply at the service cock.
6. Recommission the burner as described in Section 16.
6. Recommission the burner as described in Section 16.
WARNING
Switch off the electricity, oil and water supplies before replacing
any components.
After the replacement of components, always check for
soundness of connection of the above supplies where relevant
and carry out functional checks as described in Section 16.
19.1 Component Access
To replace components it will be necessary to remove one or
more sections of the cabinet as described in Section 5.
19.2 Component Replacement
1. Burner
For removal and servicing refer to Section 18.3.
2. Pump
Check that the electrical supply has been turned off.
Remove the appliance front panel and withdraw the burner to
prevent water ingress.
Turn off the isolating valves mounted on the outlet of the pump
and the boiler body, and drain the residual water via the drain
plug below the pump inlet.
In most cases the pump may be replaced by simply removing
and changing the motor/impeller assembly. This can be done
by undoing the four screws holding the head to the body and
pulling the head forwards. In cases where the pump body also
needs replacing, undo the two union nuts and remove the pump
from between the pipework.
NOTE: A residue of water will
remain in the pump.
Remove the pump electrical cover and disconnect the electrical
leads taking note of the wire positions.
Replace the pump in reverse order
NOTE: The direction flow indicator on the pump should point
upwards and the speed adjustment should be set to maximum
(No: 3).
Open the valves and fill the system as described in Section 16.
3. Diverter Valve
Check that the electrical supply has been turned off.
Remove the appliance front, top panel and withdraw the burner
to prevent water ingress.
Drain the boiler and Heatslave tank.
Turn off the isolating valve mounted on the boiler body, and
drain the residual water via the drain plug below the pump inlet.
The diverter valve has a removable head to make replacement
easier.
Remove the control box top cover.
Remove the diverter valve connector plug at
X8 on the control
board.
Remove the diverter valve heyco bush from the control box and
withdraw the electrical lead.
To gain access remove the electrical control box as described in
Section 19.2 (11).
To replace the diverter valve head push in the locating pin
(positioned at the bottom left hand side of the diverter valve
head) and at the same time turn to the right.
Remove the diverter valve head and fit a replacement in reverse
order.
To replace the complete diverter valve undo the diverter valve
compression fitting connected to the central heating flow pipe.
Undo the diverter valve compression fitting connected to the
heatslave tank pipe and slacken the compression fitting on the
heatslave tank.
Undo the diverter valve inlet compression fitting and slacken the
pump inlet union.
19. Replacement of Parts
34
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