Bosch WORCESTER DANESMOOR UTILITY 12/14 Installation And Servicing Instructions Download

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14.6 Clean the Boiler
1.

Remove the boiler top access door by releasing the M10 nuts

and check the fibreglass rope seal. Replace the seal if necessary.

Remove the burner mounting flange by releasing the three

M10 nuts and check the fibre glass gasket, it is imperative that
this seal is in good condition. Replace the seal if necessary
(32/50 and 50/70 models only).

Remove and check the baffle retainer, where fitted (20/25,

26/32, 32/50 and 50/70 models). See Fig. 24.

Remove the baffles, clean and check their condition. Replace

any baffles considered to be badly corroded.

Remove and check the cap retainer, where fitted (32/50 and

50/70 models only). See Fig. 24d, 24e & 25.

Remove the cap (32/50 and 50/70 models only) and check

the ‘rocksulate’ gasket. Replace the seal if necessary.

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!

Remove and check the heat shield where fitted (20/25,

26/32, 32/50 and 50/70 models). (See Fig. 24).

Check the combustion chamber base insulation board and

replace if there is any sign of damage.

10.

Check and clean the flue.

11.

Replace the items in reverse order noting the baffle positions

shown in Fig. 24.

14.7 Fire Valve.

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 2 & 3. 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.3, to allow quick detection of a dangerous situation.

14.8 Recommission the Burner.
1.

Connect the flexible oil supply hose to the isolating valve 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.

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-emission of the flue gases
from the combustion chamber to the burner inlet, or the room in
the case of a CF/LLD appliance.

On the RS balanced flue model feed the electrical lead back

through the hole in the burner surround housing (in the reverse
order to that described in 11.2) and fit the grommet into the hole
ensuring a seal is made.

Reconnect the electrical lead plug into the control box.

Turn on the oil supply at the service cock.

Recommission the burner as described in Section 12.

15. Short Parts List

Part

Manufacturers Reference

Qty

Worcester Part No.

Burner for 12/14

Bentone B9A

8 716 104 431 0

B9A Combustion Head