Oil Supply - Worcester 12/14 Installation And Servicing Instructions

8. Oil Supply

(See Figs. 9, 10 and 11).
8.1 Plastic or steel tanks should be installed to BS5410.
A steel tank should also conform to BS799: part 5 and be arranged
with a slope of 1 in 24 away from the outlet valve with a sludge
cock at its lower end.
8.2 Do not use galvanised steel tanks or pipework for the oil
supply system.
8.3 Do not use soldered joints on the oil supply pipework as this
could cause a hazard in the case of a fire.
8.4 The burners on all appliances are supplied so as to be
connected to a single pipe gravity feed system. Details of how to
convert the burners to a double-pipe sub-gravity feed system
are shown in Fig. 9.
8.5 Oil Supply System
(a) Single Pipe System
If a single pipe system is employed then the tank must be positioned
such that the oil level does not exceed 4 metres above the level of
the burner oil pump and in addition the oil level must be at least 0.3
metres above the level of the oil pump. Should it prove impossible to
site the tank below the 4 metres maximum oil level a head breaking
device must be installed between the tank and the burner.
(b) Double Pipe System
If a double pipe system is used then the maximum suction
height allowable is 3.5 metres.
(c) Single Pipe Suction Lift with De-aerator
If a single pipe suction lift with a de-aerator is used, the oil tank
must be positioned below the burner. An inlet and return loop
should be created between the de-aerator and oil pump. The oil
pump should be connected as for a double pipe system. Details
of how to convert to a double pipe system are shown in Fig. 9.
Oil inlet and return flexible hoses should be connected to the oil
pump inlet and return ports.
Table 10 is a general guide to determine the maximum allow-
able pipe run when using a de-aerator.
Table 10 does not override the de-aerators manufacturers
instructions and should only be used in conjunction with the
manufacturers instructions.
If a non-return valve is not incorporated within the de-aerator
unit, a non-return valve should be fitted in the oil line between
the oil tank and the de-aerator.
NOTE: If a de-aerator is used it should be fitted externally to the building.
8.6 Oil Supply Pipework
a) The oil supply pipe diameter can be determined using Tables 8,
9 and 10 depending on whether a single or double pipe system or
single pipe system with de-aerator is being installed. Selection of
the correct pipe diameter will depend on the position of the oil stor-
age tank relative to the burner and the length of the pipe run.
b) The oil supply pipe should be laid as level as possible to avoid
air pockets and unnecessary friction losses.
c) The following components should be fitted in the fuel line
between the storage tank and burner:
1. A manual isolating valve installed as close to the tank as possible.
2. A fire valve in accordance with BS5410 as shown in Fig. 10. The fire
valve should be fitted externally with a fire detection element located
within the appliance case. Use of a capillary type valve will allow a
neat and simple installation. A suitable valve is the KBB manufactured
by Teddington Controls Limited. A spring clip has been provided
behind the electrical panel on CF/LLD models, shown in Fig. 2, and on
the burner box on RS models, shown in Fig. 3, to allow a fire valve ele-
ment to be mounted. Alternatively a fusible link or electrical system
may be used. Under no circumstances should a combination isolat-
ing/fire valve be used as the sole fire protection device.
3. An oil filter should be fitted close to the oil storage tank. If
there is doubt about the internal oil line condition, a further filter
should be fitted near the boiler.
Fig. 9. Oil Pump.
A. Danfoss BFP 41.
Cartridge filter
3
5
2 1
B. Danfoss BFP 11 Oil Pump.
3
5
2 1
C. Suntec AS47C Oil Pump.
4
5
3
1
2
A
TABLE 8 Single Pipe Gravity Feed System
HEAD (metres)
8 mm inside dia. pipe 10 mm inside dia. pipe
(10 mm O.D. copper)
0.5
1.0
1.5
2.0
2.5
3.0
3.4
4.0
TABLE 9 Double Pipe Sub-Gravity Feed System
HEAD (metres)
8 mm inside dia. pipe 10 mm inside dia. pipe
(10 mm O.D. copper)
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
11
1 INLET
2 RETURN
3 BLEED AND PRESSURE
GAUGE PORT
4 VACUUM GAUGE PORT
6
5 PRESSURE ADJUSTMENT
6 NOZZLE OUTLET
4a
To convert to a double pipe sys-
tem, remove plug 4a and insert
4
the grub screw provided into the
threaded hole. Connect flow and
return pipes to (1) and (2).
To convert to a double pipe sys-
tem: Remove the pump front
cover, remove the changeover
screw (A) nearest to ports 1 and
2, and the horseshoe washer
underneath. Replace
changeover screw back into the
A
6
threaded hole. Connect the flow
and return pipes to 1 and 2.
Note: When removing the pump
4
front cover ensure that a suitable
receptacle is placed below the
pump to catch the oil residue.
To convert to a double pipe sys-
tem, remove the return port plug
3
(2) and insert the grub screw (A)
provided into the threaded hole
(B). Connect flow and return pipes
to (1) and (2).
B
MAXIMUM ALLOWABLE PIPE RUN
(metres)
(12 mm O.D. copper)
12
25
37
49
62
74
87
99
MAXIMUM ALLOWABLE PIPE RUN
(metres)
(12 mm O.D. copper)
50
44
38
32
26
20
14
8
the
30
69
91
100
100
100
100
100
100
100
95
80
66
51
37
22