Bosch 12/18 User Manual

OIL BURNER & PUMP

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32

8 716 113 389b (09/07) 

25

IN

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CAUTION: ISOLATE THE OIL & WATER             
MAINS SUPPLY BEFORE STARTING ANY
W O R K AN D O B S E R VE ALL R E LE VANT
SAFETY PRECAUTIONS.

OIL BURNER:

1

 Check the nozzle (A) and electrode (B) 

settings are correct for the relevant burner 
as shown opposite.

 Ensure nozzle (A) is aligned centrally within

the combustion head (C).

 Inspect for any visible defects.

IMPORTANT: Whenever replacing the 
combustion head, ensure that the photocell
is lined up with the sight hole.

OIL PUMP:

Connecting the oil pump for a single pipe 
system:

The pump is factory set for single pipe 
operation with the flexible oil hose fitted. 
Check connections before use.

Converting the oil pump for a double pipe
system:

1

 Check the inlet hose connection.

a) DANFOSS BFP 11 L3:

 Remove pump front cover (A) ensuring a 

suitable receptacle is used to catch any oil
residue.

 Remove changeover screw (B).

 Remove horseshoe washer (C).

 Refit changeover screw (B).

 Refit front cover (A).

 Remove oil pump return plug (2).

b) SUNTEC AS47C:

 Remove return port plug (2) and insert 

grub screw (B).

c) RIELLO RDB:

 Unscrew return plug (2).

 Screw in by-pass screw (3). 

2

 Connect the flexible oil return hose 

(not supplied) between the oil pump and

the return line connection, and tighten to
secure.

5mm

Electrode gap
2.5 - 3.0mm

7.5mm

B

A

C

1

2

B

1

2

B

C

A

5mm

5mm

Electrode gap 4mm

B

A

C

5mm

1

2

3

OIL BURNER & PUMP