12
8.4 Pump switches on automatically although taps are turned off
Possible Reason Remedy
a) A tap is leaking or air is escaping from the tank.
Check by switching off the complete unit overnight. Turn off all taps and check whether
the pressure drops.
b) Leaky valves or leaky safety valve cause water to
run back into the well.
Open pump and check whether the valves are sealing properly.
c) Foot valve/intermediate valve in the suction line
leaks. Water runs back into the well.
Switch pump off and lift safety valve at 3.5/5.5 bar. If foot valve/intermediate valve is
working properly, no return flow should be heard (or seen at pressure gauge of tank)
immediately after lever (214) has been lifted.
8.5 Air escapes from tap when water is let out
Possible Reason Remedy
a) There is too much air in the tank. The well water is
probably very gassy and a lot of air separates into the
tank. If the suction line is very long and the suction
head high, it could be that too much air is being
pumped.
In this case, it is advisable to disconnect the pipe of the air volume control for a while or
install a special rubber lip with a very small hole into the snifting valve.
b) Suction line leaks. Find leak and seal it.
8.6 Water is pumped easily till shortly before switch-off pressure is reached and then the pump continues to
run but does not pump any water because it can’t reach the final pressure
Possible Reason Remedy
This can happen if too much air is pumped through
the air volume control when suction lines are very
long and suction head very high. This often occurs
when the suction line is not absolutely seal-proof and
allows even more air to get into the pump. It can also
be caused by worn out rubber valve plates, worn out
cylinder or pistons.
We recommend either installing a rubber lip with a very small hole or put the air volume
control in the suction line out of action from time to time.
Replace rubber valve plates (113/123). Check whether piston or brass cylinder are worn
out and replace as necessary.
8.7 Water leaks at Air Volume Control
Possible Reason Remedy
Rubber lip of snifting valve (29) is damaged. Replace rubber lip (29a).
Fig. 111 „Büffel“ Pump Unit
Suction Line
Dischar
e Line
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