Oil Connection In A Single-Line System - Wolf COB Installation Instructions And Technical Manual

Oil filter
Single line system
Maximum line lengths
in single line systems
Anti-lift valve
Floating air
extraction
Single line system with pump lower than tank
Oil pump,
Floating air
extraction
Single line system with pump higher than tank
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12. Oil connection in a single line system
Secure the oil filter with the holder in the positions provided on the outside of the
boiler casing. It can also be secured on the inside of the boiler. In this case, the oil
hose can be up to 90 cm outside the casing when fed in from the top (to the back).
Notes:
Only use filter inserts made of sintered plastic with 25 - 40 μm.
The temperature must not fall below +5 °C. External tanks must have
supplementary heating facilities.
The system must be connected as a single line system. A filter/air vent valve
combination from the Wolf product range must be installed. Older two-line
systems must be converted to single line systems.
Two-line systems lead to accelerated oil ageing and the penetration of air into
the oil. They are no longer in line with the latest technology.
In order to prevent damage to the oil pump, the fuel oil must be supplied to the
filter using a suitable manual pump.
Assumptions:
Kinematic viscosity 6 mm²/s at 20 °C, oil temperature = 10 °C
Additional pressure drops: 4 elbows 90°, 1 non-return valve, 1 shut-off valve
In view of possible outgassing of the oil, an inlet height of more than 4 m should be
avoided.
Output
COB-15
COB-20
COB-29
COB-40
Oil pump,
burner
Oil lines that are too large may lead to operating faults caused by trapped air.
The oil line must therefore have the smallest possible diameter.
Only materials that are suitable for oil lines should be used. In the case of copper pipes,
only metallic compression fitting olives with support sleeves are permissible. They are
a reliable means of preventing air intake.
The oil lines must be installed while the system is isolated from the electrical
supply in order to avoid leaks.
burner
With negative pressure controlled anti-lift valves, the negative pressure on the inlet side is
increased considerably. It is often difficult to adhere to the maximum permissible negative
pressure of 0.3 bar in the oil line. We therefore recommend using electromagnetically
controlled anti-lift valves.
The electrical anti-lift devices can be connected to the COB in two ways:
1. The anti-lift valve is connected at output A1. For this, output A1 must be programmed
to 9 (oil shut-off valve), see HG14.
2. If output A1 is already being used (e.g. for a DHW circulation pump), an adaptor
plug can be used. The plug (mat. no. 1718768761) is inserted between the motor of
the oil pump.
When connecting a feed pump in the supply line, the negative pressure must not exceed
0.5 bar.
Contaminants can lead to system damage. The oil line must be flushed
prior to commissioning.
Internal
Throughput
line Ø
kg/h mm 4
4 77
to 2.5
6 100
4 39
2.5 to 5.0
6 100
Inlet height H (m)
3 2 1 0 -1
68 58 49 40 31
100 100 100 100 100
34 29 25 20 16
100 100 100 100 79
-2 -3
22 13
87 64
11 6
56 32
17