Steffens WL Bedienungsanweisung Seite 11

Check the automatic pressure relief unit every six
months by lifting the valve cone by the handle
while the pump is running.
The automatic pressure relief unit trips when the
pressure in the pump air chamber is 4.0 and 6.0,
Caution
respectively. Never judge on the basis of a
pressure gauge reading of 4.0 bar in the pressure
tank, as the resistance in the discharge pipe, the
inertia of the pressure switch and peak loads are
not accounted for in the reading.
The unit may trip prematurely if:
1. The air cushion in the pump air chamber is insufficient.
See section 9. for remedy.
2. The discharge pipe is long or resistance in it is high.
See section 9. for remedy.
Alterations to the pressure relief valve adjustments may only be
carried out in the factory. The adjustment and examination must
be carried out in accordance with the valid test specifications.
FILIA, FILIUS units
Before starting repair and maintenance work,
make sure that the electricity supply has been
switched off and that is cannot be accidentally
switched on. The pressure in the tank and pipes
should be released.
Depending on the pressure, the units can start
independently if they have not been switched off.
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