afriso Flow-Control 3/K Notice Technique page 44

6.4 Use in flood hazard areas
The product is suitable for use in flood hazard areas; it is watertight up to
10 mH2O (1 bar pressure).
INOPERABLE PRODUCT
• Verify that the product (without vent hose) is replaced after a flood.
Failure to follow these instructions can result in equipment damage.
The product continues to be operative after a flood. No fuel oil can escape if
the product does not have a vent hose. However, waste water may get into
the product. Therefore, products without vent hoses must be replaced after a
flood.
 Verify that the vent line is connected to the return connection of the tank
or ends above the maximum possible water level.
6.5 Accumulations of air
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 visible 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 consump-
tion by burner). When a vacuum is generated during operation of the burner,
this causes the oil level to decrease in the filter cup outside of the filter sieve.
The inside of the filter sieve is completely filled with filtered oil so that mal-
functions cannot occur.
Operation
NOTICE
Flow-Control
EN
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