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Worcester-Bosch Greenstar Danesmoor Utility Regular - Utility System Manual

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Service and Spares
Greenstar Danesmoor Utility 2022+ and Utility System 2022+ - 6 721 846 263 (2022/01)48
Fig. 76 Expansion vessel removal
3. Unplug burner lead (F) from control box.
Fig. 77 Burner lead
4. Loosen clip (G) to detach air duct pipe from burner (H).
▶ Unscrew burner retainer nut ( I ) and gently pull burner forward so
that the retainer (J) is free of the lug (K).
Fig. 78 Burner removal
7.3 Service requirements
See the following instructions for detail of some of the service
requirements listed below:
▶ Check and clean the burner.
▶ Replace the burner nozzle and flexible oil pipe/s.
▶ Check and clean the baffle retainers.
▶ Check and clean the baffles.
▶ Check that the flue damper is correctly fitted, if required.
▶ Check and clean the heat exchangers surfaces.
▶ Check the combustion chamber access door insulation board.
▶ Check that the flue system is unobstructed and clean as necessary.
▶ Clean or replace all oil filters.
▶ Check that the condensate system is not obstructed, clean and refill
the condensate trap.
7.4 Sealed system only
The PRV is a safety device and must be checked for correct operation.
The expansion vessel pressure must also be checked and adjusted if
required.
7.5 Clean the burner
▶ Remove the two hex head screws [1] and remove the air intake cover
[2] and clear any debris from the air intake and air shutter.
▶ Remove the four screws [3] and remove the suction inlet [4] to gain
access to the fan.
▶ Clean both sides of the fan and suction inlet cover with a brush and
compressed air.
▶ Check the condition of the gaskets between these parts and replace
if necessary.
▶ Note the position of the air shutter adjustment and check the air
shutter moves freely.
▶ Check that the fan rotates freely.
▶ Reassemble the components.
Fig. 79 Fan access
7.6 Oil burner nozzle
Before removing or fitting a new nozzle refer to figure 80:
▶ Remove the screws [1] from the blast tube [2] and remove the blast
tube
▶ Unplug the HT leads [4]
▶ Loosen the screw [3] securing the break plate [5] and slide the unit
off
1
6720808218-96.1Wo
D
D
F
2. & 3.
6720809436-20.2Wo
G
6720808218-74.1Wo
I
J
K
4.
There is a recirculation tube fitted to the 12/18 models,
this does not need to be removed from the blast tube
6720821683-13.1Wo
4
1
2
3
… 48 …


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