Afriso EURO-INDEX FloCo-Top-1K Notice Technique page 24

Operation
5 Operation
5.1 Oil level in the float housing
5.2 Pressure mode
5.3 Accumulations of air in the filter cup
24
The oil level depends on the operating conditions of the facility and
amounts to approx. 20-50 mm in suction mode. If the oil level is
higher, the float housing may be completely filled with oil if the suc-
tion line is tight. This is caused by the absorption of the air through
the fuel oil. Over time, this results in a reduction of the air cushion.
When the operating conditions change (e.g. decreasing oil level in
the tank), the air cushion is formed again in the float housing.
Since in pressure mode with an oil pump there is no gas formation
caused by suction, it is not meaningful to use FloCo-Top-1K in this
mode. In pressure mode, it is recommended to use a single-line filter
with return pipe connection. If the system requires an fuel oil de-
aerator, you can use a FloCo-Top-2MM with de-aerator hood and
with retrofitted brass filter cup or replaceable filter cartridge, see
chapter 8, page 14.

In the case of such applications, take appropriate measures to
prevent the maximum permissible inlet pressure of 0.7 bar from
being exceeded even in the case of error conditions (defective
pressure reducer, etc.), e.g. by means of a bypass valve, a
pressure switch, etc.

A drip pan has to be placed below the burner hoses and the oil
de-aerator.
Depending on the filter insert and the suction vacuum of the facility,
the air separated from the oil may be retained by the filter insert to a
major or minor degree.
An air cushion may form upstream of the filter; this air cushion is vis-
ible in the filter cup. The size of the air cushion depends on the flow
rate and the suction pressure in the filter, i.e. more air particles may
be pulled through the filter at a great throughput compared to a slow
flow rate (lower oil consumption by burner). When a vacuum is gen-
erated during operation of the burner, this causes the oil level to de-
crease in the filter cup outside of the filter. The inside of the filter is
completely filled with filtered oil so that malfunctions cannot occur.
The irregular pore structure of the standard sintered plastic filter in-
sert with a spatial effect assures excellent permeability of the air.
– English –
FloCo-Top-1K