Worcester 70/90, Installation And Servicing Instructions

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14.1
The following should be carried out at least once per year
for 28 second Kerosene and twice per year for 35 second Gas Oil,
to ensure efficient, trouble free operation.
1.
Carry out a pre-service check noting any operational faults.
2.
Check and clean the burner.
3.
Check and clean the air intake grille located in the boiler
room.
4.
Check and clean the baffle retainer (70/90 and 90/110
models only).
5.
Check and clean the baffles.
6.
Check and clean the heat exchanger surface.
7.
Check the heat shield (on 70/90 and 90/110 models only).
8.
Check the combustion chamber base insulation board.
9.
Check that the flue system is unobstructed and clean as
necessary.
11.
If the appliance has been installed in a compartment check
that the ventilation areas are clear.
12.
Clean all oil filters.
Some of the servicing points are covered more fully in the
following instructions:-
14.2 Pre-Service Check
1.
Remove the cabinet front and top panels as described in
section 5 .
2.
Operate the appliance and system, noting any faults which
may need to be corrected during the service.
14.3 Cleaning the Burner
IMPORTANT:
Disconnect the electrical supply at the mains
before commencing any servicing. Turn off the oil at the service
cock.
1.
Remove the burner.
(a) Isolate the oil supply at the valve located close to the
burner.
(b) Slacken the two burner locking screws, remove the burner,
and carefully place on the floor.
2. Clean the fan impeller using the following procedure:
Electro-oil Inter B9 Burner
(a) Remove the two screws holding the combustion head in
position and withdraw the combustion head and air guide
collar.
(b) Remove the three remaining screws holding the front
cover plate in position and withdraw the cover to expose
the fan impeller.
(c) Clean both sides of the fan impeller and remove any debris
from the burner housing.
(d) Check that the impeller rotates freely.
(e) Clean the air inlet passage and check that the adjustment
mechanism operates freely.
(f) Re-assemble the components.
Electro Oil Inter B11
(a) Remove the acoustic fan inlet cover.
(b) Remove the three screws holding the fan cowl in position
and remove the cowl noting how the fan control flap is
positioned.
(c) Check that the air control flap pivots freely and ensure the
air path to the burner head is clear.
(d) Clean both sides of the fan impeller and remove any debris
from the burner housing.
(e) Check that the impeller rotates freely.
(f) Re-assemble the components.
Electro Oil Sterling 40
(a)
Remove the air adjustment cover.
(b)
Separate the main body of the burner from the burner
front by removing the M6 allen screw (located beneath the
air adjustment screw), using a 5mm allen key.
(c)
Note the position of the air damper adjustment and check
the air damper moves freely.
(d)
Check the air path to the burner head is clear.
(e)
Clean both sides of the fan impeller and remove any debris
from the burner housing.
(f)
Check the impeller rotates freely.
(g)
Re-assemble the components.
3.
Remove the combustion head and thoroughly clean all
deposits.
4. Inspection of Mechanical Shut-off Valve.
a) Remove the nozzle.
b) Fasten an M5 screw, with a minimum length of 30mm, into
the threaded hole (A) and pull the screw to withdraw the check
valve.
c) Check that the nozzle holder is clear of any debris and clean if
necessary.
d) Check that the 3 holes in the check valve are clear of any
debris. Discard the check valve if the holes cannot be cleared or
if the unit is defective and replace with a new one.
e) Replace in the reverse order.
5.
It is strongly recommended that the oil atomising nozzle is
replaced at each service. If this is not possible then remove and
clean the integral filter, but under no circumstances should the
nozzle be stripped into its component parts and never attempt
to clean the nozzle tip.
6.
Check and reset the electrodes, where necessary, as shown in
Figs. 13, 14 and 15.
7.
Replace the combustion head and check that the nozzle lies
central to the combustion head and the head settings are as
shown in Figs. 13, 14 and 15.
8.
Withdraw the photocell from its housing and clean.
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 6.
10.
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.
11.
Re-assemble the burner components.
12.
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 the flue gases to leak into
the room.
14.4
Remove the paper element from the external oil filter and
replace. If the filter contains a washable element then
thoroughly clean in Kerosene or white spirit and re-assemble
into the filter.
14.5 Clean the Boiler
1.
Remove the boiler top access door by releasing the two M10
nuts and check the fibreglass rope seal. Replace the seal if
necessary.
14. Routine Cleaning And Inspection
16
Fig. 17. Mechanical Shut-off Valve.
Check Valve Check Valve
Nozzle Assembly
A