Bosch Appliances 18/25 Clean the Burner, Fan impeller, These parts and replace if necessary

								INSPECTION AND SERVICE
12/18 & 18/25								1 Clean the Burner:
								Remove the air intake cover (H) and clear
P	H	D						any debris from the air intake and air damper.
								Disassemble the burner to allow access to
								the fan impeller.
				N				Check the condition of the gaskets between
								these parts and replace if necessary.
								Note the position of the air damper
			Electrode gap					adjustment and check the air damper moves
								freely.
			2.5 - 3.0mm
								Clean both sides of the fan impeller and
							M
								remove any debris from the burner housing.
						O
					L			Check that the impeller rotates freely.
		F
			E					Reassemble the components.
								Remove the combustion head (K) and
		5mm	5mm					thoroughly clean any deposits.
								Remove the nozzle (E).
								2 12/18 & 18/25 Inspection of Mechanical
		K						Shut-off Valve:
								Fasten an M5 screw, with a minimum length
			7.5mm					of 30mm, into the threaded hole (L) and pull
								the screw to withdraw the check valve (M).
								Check that the nozzle holder (N) is clear of
								any debris and clean if necessary.
								Check that the three holes in the check valve
								(M) are clear of any debris. Check the
25/32								condition of the 'O' ring (O). Discard the
								check valve if the holes cannot be cleared, if
P	H	D
								the unit is defective or if the 'O' ring is
								damaged and replace with a new one.
								Refit the check valve.

F	E
5mm	5mm
	K
	Electrode gap 4mm

DANFOSS	SUNTEC	RIELLO
BFP 11 L3 OIL PUMP	AS47C OIL PUMP	RDB OIL PUMP
A	A	A
B		B

A - Retaining screws - cover

B - Cover - oil pump

25/32

Check the nozzle holder is clear of any debris and clean if neccessary.

12/18, 18/25 & 25/32

Fit a new oil atomising nozzle (E).

DO NOT dismantle the nozzle and DO NOT clean the nozzle tip.

Check the electrodes (F) and reset if necessary as shown opposite.

Refit the combustion head. Check that the nozzle (E) lies centrally in the combustion head and the head settings are as shown.

Ensure that the photocell is lined up with the sight hole.

Withdraw the photocell (P) from its housing and wipe clean.

Remove the oil pump internal filter, clean in kerosene and reassemble.

The internal filter is accessed by removing screws (A) and the oil pump cover (B) on the Danfoss BFP 11 L3, Suntec AS47C and Riello RDB.

Replace the standard flexible oil hose/s at every annual service to prevent the possibility of leakage due to ageing.

BReassemble the burner components. Check the sponge O-ring seal located around the combustion head and replace if necessary.

This seal must be in good condition since failure will cause flue gases to escape into the cabinet.

SERVICING & SPARES

38

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32 8 716 113 389b (09/07)

INSPECTION AND SERVICE